Technical Specifications

Technical Requirements

TECHNICAL SPECIFICATIONS

1.0 GENERAL

All equipment shall be of such overall dimensions, operating weights, service area
requirements and configuration that it can be located where shown on the plans without
any adverse effect on its performance and clearance requirements. Electrical input KW
shall not exceed KW listed in Schedules. Any change in other trades work, anticipated by
offering alternate equipment shall be estimated by the Contractor and its cost shall be
included in the quoted price for HVAC works.

All equipment supplied under this section shall be brand-new, factory manufactured and
factory assembled and complete in all respects. The type, characteristics, capacity rating,
component sections of all equipment shall be as scheduled in the drawings.

All equipment furnished by the contractor shall include vibration isolation mounting,
pads, anchors bolts frames or any other mounting or supporting accessories.

All power driven equipment shall include motor drives, motor foundation bases and
accessories.

2.0 WATER COOLED CENTRIFUGAL TYPE WATER CHILLERS

GENERAL

Furnish and install as scheduled, factory assembled, single piece, microprocessor liquid
chillers, utilizing a Multi Stage Semi-Hermetic Centrifugal Compressor, using HFO
Blends or HCFO Refrigerant R-1233zd (E) / R-513A / R-514A and its Global Warming
Potential must not exceed from 700 GWP Value. Rotary screw compressor shall not be
acceptable. Unit shall be complete with motor, lubrication system, cooler, condenser and
initial oil and refrigerant operating charges. Compressor motor starter shall be mounted
on the chiller, wired, and tested by the chiller manufacturer.

All chiller parts shall be painted using standard painting methods of the manufacturer.

REFERENCES

 ANSI/ASHRAE STANDARD 15-2007 - Safety Code for Mechanical Refrigeration.

 ASHRAE 90.1 - Energy Conservation in New Building Design.
 ASME SEC VIII - Boiler and Pressure Vessel Code.
 AHRI STANDARD 550/590-2011 - Centrifugal, Helical rotary, scroll, and reciprocating
water chillers.
 AFBMA 9 - Load Ratings and Fatigue Life of Roller Bearings.
 ASHRAE STANDARD 34 - Number Designation and Safety Classification of
Refrigerants

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 ANSI/ASHRAE Standard 147-2002 - Reducing the Release of Halogenated Refrigerants
from Refrigerating and Air-Conditioning Equipment and Systems

REGULATORY REQUIREMENTS

 Refrigeration Transfer: Provide service valves and other factory-installed accessories

required to facilitate transfer of refrigerant from the chiller to remote systems.
 Low Pressure Chiller must have a high efficiency purge system to ensure that the any
potential possible non-condensable leakage into the vessel shall immediately eliminate.
The main unit controller shall monitor the purge run time.

EQUIPMENT ROOM REQUIREMENTS

 Follow minimum standards for refrigeration systems as required by ANSI/ASHRAE

Standard 15-2007 paying special attention to requirements for air monitoring,
ventilation, self-contained breathing apparatus, and leak detection to assure the safety
of chiller plant operating personnel.
 Install proper outside exhaust of chiller refrigerant relief device(s), discharge
header(s), and purge unit(s). Route exhaust to the outside of the building and away
from all air intakes in compliance with ANSI/ASHRAE Standard 15-2007. Per
ASHRAE STD 147, medium pressure units with relief valves only shall have rupture
discs also to minimize refrigerant leakage.

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WARRANTY

Provide a complete unit parts warranty for one year from startup.

MAINTENANCE SERVICES

All inspections and service of units shall be accomplished by factory trained and
authorized servicing technicians.

COMPRESSOR-DRIVE ASSEMBLY

Description:

High performance, Multi-Stage, Centrifugal-type Compressor driven by an Electric

Motor.

Compressor:

 Casing: Cast iron, precision ground.

 Impeller: High-strength cast aluminum or cast-aluminum alloy on carbon-steel or
alloy-steel shaft. The impellers shall be fully shrouded A tunnel diffuser shall provide
a highly efficient controlled diffusion ratio by means of individually contoured,
machined-in channels of circular cross section.
 Chiller should be able to unload to 20 percent of design tonnage with constant entering
water temperature. The minimum unloading point shall be demonstrated at the time of
the factory performance test.
 Manufacturers with speed increasing transmissions shall not exceed 5,000 RPM
compressor speeds and shall annually inspect the gears and all bearings.
 Impellers shall be dynamically balanced and over-speed tested at 1.25 times impeller
shaft speed.

Drive:

Direct drive, hermetic design using an electric motor as the driver.

Compressor Motor:
 Compressor motor shall be of the semi hermetic, liquid cooled, squirrel cage,
induction type, two pole motor with energy efficiency required to suit chiller energy
efficiency indicated, and suitable for the voltage shown on the equipment schedule.
Hot gas motor cooling is not acceptable. Open drives are not acceptable due to the
potential for refrigerant and oil leakage associated with the mechanical shaft seal and
the coupling between an open motor and the compressor.
 Motors shall be suitable for operation in a refrigerant atmosphere and shall be cooled
by atomized refrigerant in contact with the motor windings.

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 Motor stator shall be arranged for service or removal with only minor compressor
disassembly and without removing main refrigerant piping connections.
 Full load operation of the motor shall not exceed nameplate rating.

Vibration Balance:

 Balance chiller compressor and drive assembly to provide a precision balance that is
free of noticeable vibration over the entire operating range. Compressor assembly
shall be vibration tested at the factory.
 Over speed Test: 25 percent above design operating speed.

Service:

 Compressor, Motor, and Transmission shall be hermetically sealed into a common

assembly and arranged for easy field servicing.
 Internal compressor parts must be accessible for servicing without removing the
compressor base from the chiller.
 Connections to the compressor shall be flanged or bolted for easy disassembly.
 Provide lifting lugs or eyebolts attached to casing.

Capacity Control:

 Provide modulating, variable-inlet, guide-vane assembly combined with variable

motor speed, if necessary, to achieve performance indicated.

a) Maintain stable operation that is free of surge, cavitation, and vibration

throughout range of operation. Configure to achieve most energy-efficient operation
possible.
b) Operating Range: From 100 to 20% of design capacity with (2.5 °F) (1.38 °C)
drop in entering condenser water temperature per 10 % capacity reduction, while also
providing pre- whirl of the refrigerant vapor entering the impeller for more efficient
compression at all loads.

Oil Lubrication System:

 Provide lubrication system to bearings, gears, and other rotating surfaces at all
operating, startup, coast down, and standby conditions including power failure.
 Compressor shall be provided with a factory installed lubrication system to deliver oil
under pressure to bearings and transmission. Included in the system shall be:
a) Hermetic motor-driven oil pump with factory installed motor contactor with
overload protection.
b) Oil cooler.
c) Oil pressure regulator.
d) Oil sump heater [115/230 v, 50 or 60 Hz] controlled from unit microprocessor.
e) Oil reservoir temperature sensor with main control center digital readout.
f) Oil pump and motor for 220-240, 346-440 v, 3 ph, 50 Hz power source.

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 When factory mounted compressor motor starter is provided, all wiring to oil pump,
oil heater, and controls shall be pre-wired in the factory and power shall be applied to
check proper operation prior to shipment.
 Manufacturer's standard method to be consulted to remove refrigerant from oil.
 Oil compatible with refrigerant and chiller components.

EVAPORATOR

Description:

Shell-and-tube design with water in tubes and refrigerant surrounding tubes within shell.
Shell is separate from condenser. The evaporator shall be built in accordance with
ANSI/ASHRAE 15-2001 Safety Code for Mechanical Refrigeration. Units shall be multi-
stage compressors incorporating an inter-stage flash vessel "economizer".

Shell Material: Carbon-steel rolled plates with continuously welded seams or seamless
pipe.

Provide 19 mm thick insulation on barrel.

Design to prevent liquid refrigerant carryover from entering compressor.

Tubes:

 Individually replaceable from either end and without damage to tube sheets and other
tubes.
 Mechanically expanded into end sheets and physically attached to intermediate tube
sheets.
 Material: Copper.
 Minimum Wall Thickness: 0.635 mm of the plain land contacting the intermediate
tube supports and end sheets.
 External Finish: Manufacturer's standard.
 Internal Finish: Enhanced or smooth.

End Tube Sheets: Continuously welded to each end of shell; drilled and reamed to
accommodate tubes with positive seal between fluid in tubes and refrigerant in shell.

Intermediate Tube Sheets: Installed in shell and spaced along length of tube at intervals
required to eliminate vibration and to avoid contact of tubes resulting in abrasion and
wear.

Water Box:

 Cast-iron or carbon-steel construction; arranged to provide visual inspection and

cleaning of tubes from either end without disturbing refrigerant in shell.
 Standard Non-Marine type for water box with piping connections.

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 Waterbox shall have standard Victaulic grooves.
 Supply and return head waterboxes shall be designed for a working pressure of 150
psig and shall be factory hydrostatic pressure tested at 150 percent of the design
pressure. Provide drain and vent connections in water boxes.

CONDENSER

Description:

Shell-and-tube design with water in tubes and refrigerant surrounding tubes within shell.
Shell is separate from evaporator. The condenser shall be built in accordance with
ANSI/ASHRAE 15-2001 Safety Code for Mechanical Refrigeration.

Shell Material:
Carbon-steel rolled plates with continuously welded seams or seamless pipe.

Design to prevent direct impingement of high-velocity hot gas from compressor

discharge on tubes.

The condenser shell shall include a Flash Sub-cooler which cools the condensed liquid
refrigerant to a reduced temperature, thereby increasing the refrigeration cycle efficiency.

Tubes:

 Individually replaceable from either end and without damage to tube sheets and other
tubes.
 Mechanically expanded into end sheets and physically attached to intermediate tube
sheets.
 Material: Copper.
 Nominal OD: 3/4 inch.
 Minimum Wall Thickness: 0.635 mm, measured at the root of the fin unless
otherwise noted.
 External Finish: Manufacturer's standard.
 Internal Finish: Enhanced or smooth.

Tube Sheets:

 Continuously welded to each end of shell; drilled and reamed to accommodate tubes
with positive seal between fluid in tubes and refrigerant in shell.
 Tube sheet holes shall be double grooved for joint structural integrity.
 The tube sheets of the cooler and condenser shall be bolted together to allow for field
disassembly and reassembly.

Water Box:

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 Cast-iron or carbon-steel construction; arranged to provide visual inspection and
cleaning of tubes from either end without disturbing refrigerant in shell.
 Standard Non-Marine type for water box with piping connections.
 Waterbox shall have standard Victaulic grooves.
 Supply and return head waterboxes shall designed for a working pressure of 150
psig and shall be factory hydrostatic pressure tested at 150 percent of the design
pressure. Provide drain and vent connections in water boxes.

INSULATION

Unit manufacturer shall insulate the cooler shell, motor shell and motor cooling lines.

Insulation shall be 19 mm thick with a thermal conductivity not exceeding 0.28 (Btu
in.)/hr ft2 F [(0.0404 • W)/(m • °C)].

ELECTRICAL

Factory installed and wired, and functionally tested at factory before shipment.

Terminal blocks with numbered and color-coded wiring to match wiring diagram.

PURGE SYSTEM

A. The manufacturers of low pressure machines must provide a purge system. The Turbo
guard Purge is not acceptable.
B. The purge efficiency must meet ASHRAE Standard 147-2002.
C. The purge shall be capable of operating when the chiller is idle in accordance with
ASHRAE Standard 147-2002.

CONTROLS

A. The chiller shall be controlled by a unit mounted, stand-alone Direct Digital Control
(DDC) system. A dedicated chiller microprocessor control panel is to be supplied with
each chiller by the manufacturer.
B. Enclosure shall be unit mounted NEMA 250 Type 1 using wire duct. Zip ties are not
acceptable.
C. A color, touch sensitive liquid crystal display (LCD) shall be unit mounted and a
minimum of 12" diagonal. The display shall be fully adjustable in height and viewing
angle. Animated graphical representations of chiller subsystem operation shall be
used to enhance the user interface.
D. Display shall consist of a menu driven interface with easy touch screen navigation to
organized subsystem reports for compressor, evaporator, condenser, purge and motor
information as well as associated diagnostics. The controller shall display all active
diagnostics and a minimum of 20 historical diagnostics.
E. The controller shall have the ability to display all primary sub-system operational
parameters on dedicated trending graphs. The operator must be able to create up to 6

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additional custom trend graphs, choosing up to 10 unique parameters for each graph to
trend log data parameters simultaneously over an adjustable period and frequency
polling.
F. The chiller control panel shall provide control of chiller operation and monitoring of
chiller modules, sensors, actuators, relays and switches.
G. Safeties - the chiller control panel shall provide the following safeties:
1. Low chilled water temperature
2. Low evaporator refrigerant temperature or pressure
3. High condenser refrigerant pressure
4. Evaporator and condenser water flow status
5. Low & High oil pressure & temperature
6. High motor winding temperatures & current
7. Starter function faults
8. Sensor faults
9. Unit controls operation
10. High bearing temperatures. Each of the compressor and motor bearings
(including high speed, low speed, and thrust bearings) shall have factory
installed, separate temperature sensors installed on the bearing or in the oil
return line of each separate bearing. If any oil temperature reaches or exceeds a
set value, the chiller control panel shall shut down the chiller, display the
diagnostic, and activate the front panel alarm indicator.
11. Chiller control panel or starter shall incorporate advanced motor protection to
safeguard the motor throughout the starting & running cycles from the adverse
effects of:
a. Current phase loss/unbalance/ reversal
b. Under/Over voltage
c. Distribution fault protection with auto restart consisting of three-phase
current sensing devices that monitor the status of the current
d. Starter contactor fault protection
e. Starter transition failure
H. The chiller control panel shall be capable of displaying system data in I-P or SI units.
I. The front of the chiller control panel shall display the following in clear language,
without the use of codes, look-up tables, or gauges:
1. Run time
2. Number of starts
3. Current chiller operating mode
4. Chilled water set point and set point source
5. Electrical current limit set point and set point source
6. Entering & leaving evaporator water temperatures
7. Entering & leaving condenser water temperatures
8. Saturated evaporator & condenser refrigerant temperatures
9. Oil tank temperature & pressure
10. Oil pump discharge pressure
11. Differential oil pressure
12. Compressor motor voltage & current per phase
13. Compressor motor percent RLA

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14. Bearing oil & compressor discharge temperatures
J. The chiller control panel shall provide password protection of all set-points.
K. Control authority must be capable of handling at least four conditions: Off, local
manual at the chiller, local automatic at the chiller and automatic control through a
remote source.
L. The chiller control panel shall provide individual relay outputs to start/stop the
evaporator and condenser water pumps. The condenser water pump relay output can
be used to enable the cooling tower temperature controls.
M. The chiller control panel shall provide leaving chilled water temperature reset based
upon return water temperature.
N. The chiller control panel shall be capable of providing short cycling protection.
O. The chiller control panel shall provide an alarm relay output that shall energize
whenever a fault requiring manual reset is detected by the panel.
Y. The chiller controller must be able to communicate directly to a building automation
system using BACnet protocol.

STARTER

A. VARIABLE FREQUENCY DRIVE (VFD), UNIT MOUNTED

 The centrifugal water chiller shall furnished with air or liquid cooled variable
frequency drive (VFD). The VFD shall factory mounted on the chiller and
shipped completely factory assembled, wired and tested.
 The VFD shall specifically designed to interface with the centrifugal water
chiller controls and allow for the operating ranges and specific characteristics of
the chiller. The VFD efficiency shall be 97% or better at full speed and full
load. Fundamental displacement power factor shall be a minimum of 0.96.
 The VFD shall be solid state, microprocessor based pulse-width modulated
(PWM) design. The VFD shall be voltage and current regulated.
 Input shall be nominal 400 volts, three phase, 50 hertz AC power, ±10% of
nominal voltage.

3.0 COOLING TOWERS

3.1 General

Cooling towers shall be factory assembled or site assembled under supervision by

manufacturer’s representative, of rectangular multi-cell induced draft Cross Flow square
type of approved manufacturer, constructed generally of weather proof and corrosion
resistant materials and complete with fan, water distributing system, infill, tower basin,
sump, drift eliminators, drains and fittings.

The size and capacity of the tower shall be suitable for the location and space indicated
on the drawings with ample clearances for installation, operation and maintenance. The
heat rejection capacities shall be as scheduled.

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Cooling towers installed external to the building shall be adequately designed to
withstand the maximum stress imposed by broadside winds equivalent to 1.5 kpa of
projected surface.

3.2 Structure

Cooling towers shall be of fiberglass reinforced polyester or PVC construction

manufactured entirely from U.V. stabilized non-corrosive materials with all fastenings of
steel. Casing shall be fitted with access doors to reach all internal parts, such as sumps,
water distribution system, without the removal of the infill.

Unit support legs, framing and structural members shall be formed from heavy gauge
steel sheet or pipe sections, hot dip galvanized after fabrication. It shall be suitable for the
installation of vibration isolators where specified, with minimum addition of auxiliary
structural support.

3.3 Cold Water Basin

The cold water basin shall be complete with flat basin to an integral sump fitted with a
removable screened suction outlet connection, balancing outlet connection, overflow,
valve drain and float controlled make-up connection.

3.4 Water Distribution System

Cooling towers shall be provided with a water distribution system designed so that a
water flow of 140 percent of the specified capacity will not cause overflow or splashing.

Hot water will distributed by PVC distribution pad through gravity flow.

Tower infill shall be of corrugated honeycomb packs which shall be removable or

otherwise made accessible for cleaning. All PVC in-fills shall be ultra-violet ray treated.
Multiple layers of infills shall be separately reinforced and supported to ensure stability
in operation.

3.5 Drift Eliminators

The tower shall be fitted with (PVC) drift eliminators specially designed to ensure water
loss due to drift is not more than 0.02% of the circulating water quantity.

3.6 Fans

Fans shall be axial type, of slow speed belt driven, quiet in operation and statically
balanced.

Fan motors shall be totally enclosed fan cooled weather proof type suitable for 415 volt/3
phase/50 Hz power supply and sized to be non-overloading at all operating conditions

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and comply in all respects with the “Motors” clause in the section on “Electrical Works”
of this specification.

Belt drives shall be weather-proof and shall have adequate means for adjusting belt
tension. Weather-proof belt covers shall be provided to protect V-belts which shall be of
the fabric impregnated type.

All motors/fan rotors shall be statically and dynamically balanced to International

Standard ISO-1940 “Balance Quality of Rotating Rigid Bodies” and shall be free from
vibration at all operating speeds and during starting and stopping cycles.

3.7 Access Ladders

An access ladder constructed of hot dipped galvanized iron shall be provided for gaining
access to the water distributing system and fans. In multiple cell towers where single
point access is provided, a safety rail made of hot dipped galvanized iron shall be
provided around the tower top periphery.

4- AIR HANDLING UNITS

4.1 General

AHUs shall be factory assembled packaged air handling units of capacities and
characteristics as scheduled and shown on the Drawings. Air Handling Units shall be
vertical or horizontal type with components as scheduled and as shown on Drawings.

Units shall be of such overall dimensions, weight, service and requirements,

configuration, so that these may be located where shown.

The same coils shall be used for cooling or heating and coils shall be of non-ferrous
construction with mechanically bonded smooth aluminium fins, suitable for chilled
water/hot water application.

4.2 Centrifugal Fans

Fans shall be inlet centrifugal fans mounted on a common shaft. Fans shall be statically
and dynamically balanced and shall have permanently lubricated bearings. Fans shall be
belt driven with adjustable sheaves. Fans shall have spring isolation from the casing. The
unit shall be variable and suitable for adjustment within ±10% (plus/minus) of specified
R.P.M. The unit shall be provided with belt guard.

4.3 Motors

Motors shall be 3-phase totally enclosed, minimum protection IP-54, insulation class F,
fan cooled with dynamically balanced rotors and pre-lubricated ball bearings. They shall
be mounted on an adjustable base for belt tensioning.

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4.4 Casing

Casing shall be double skin type from hot dip galvanized and shall have a raised
insulation consisting of a factory applied polyurethane layer of minimum 50mm (2.0”)
thickness injected between the panels having a minimum density of 2.5 lbs./ft3 (40
Kg/m3) be made of sheet steel and finished with electro-statically coated powder baked
paint. The unit frame-work shall consist of hot-dip galvanized multi-angle sectional
elements, assembled with reinforced corners. Re-location of fan section in relation with
coil section shall be possible to achieve up-blast, down-blast, top horizontal and bottom
horizontal discharge, and vertical or horizontal arrangement of AHU. Factory assembly
shall be as scheduled. If scheduled AHUs shall include factory assembled mixing box
with RA and OA inlet connection, and RA/OA dampers.

AHUs to be installed outdoors (as shown on drawings), shall be equipped with a canopy.
Access doors shall be equipped with robust quick release locks and hinged doors with
handles for easier opening.

4.5 Coils:

a) Chilled Water Coils:

The coils shall be combination type (Cooling / Heating,) seamless copper tubes
expanded into aluminum fines. The fin distance should not be less than 2.5 mm between
fine. The casing shall be of Galvanised steel. The tubes shall be correctly circulated for
desired velocity of water and the pressure drop across the coil should not exceed 30 kPa.
The coil shall be removable type for easy cleaning. Each coil shall be suitable for
working pressure of 14 Bars and 100C. The Air velocity across the AHU coil at the
designed Air Volume shall not exceed 2.5 meter per second.

b) DX-Coils

Additionally the AHUs shall be provided with DX-Coil section with DX coil of capacity
as mentioned in the equipment schedules to be connected with the matching Air Cooled
Condensing unit as specified.

4.6 Mixing Boxes With Air Dampers

Air handling units shall be provided with mixing boxes (if mentioned in schedules)
having return air and outside air inlets. The mixing boxes shall have sufficient size to
facilitate the proper mixing of the return and outside airs. Mixing boxes shall be equipped
with air damper on both inlet openings.

Air dampers shall have opposed airfoil blades, rotating in nylon bushes via glass
reinforced nylon gears. Blade material shall be Aluminium type. Blade length shall be
sectionalized to not more than 48 inch (1200mm).

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Soft plastic profiles at the edges of the blades shall be provided to assure tight closure of
dampers. Dampers shall be inter-linked with galvanized steel pivot rod.

4.7 Filters

4.7.1 General:

Air handling units are to be supplied complete with filters as scheduled and having the
following minimum specifications:

4.7.2 Disposable Pre-Filters:

These filters shall be 2 inch (50 mm) thick, pleated type, capable of operating up to 500
FPM (2.5 m/s) face velocity without loss of filter efficiency and holding capacity. Filter
media shall be of synthetic fibre with calibrated density and shall meet the efficiency
class as scheduled. Filter frame shall be constructed of galvanized U section with two
electro-welded steel wire meshes.

4.7.3 Bag Filters:

The Air Handling Units shall be provided with factory fitted bag filters of efficiency as
scheduled. The filter media shall be constructed with synthetic fiber with differential
density assuring a progressive filtration in the direction of air flow. The filter media shall
be externally coated with a high resistance lining. The filter element shall be constructed
of a series of sealed bags spaced in order to allow an elevated and uniform accumulation
of dust.

The filter frame shall be of galvanized steel shaped with rounded edges to eliminate
contact between the filter media and the rough steel edges avoiding tears and resulting
dust losses. Each bag shall have its own support bracket and special joints to maintain
each single bag within the external perimeter frame.

4.8 Condensate Drain Pan

A condensate drain pan, with double wall construction and insulation in between shall be
provided. Inner pan shall be finished with a factory applied coating of corrosion resistant
material. Insulation, adhesive and inner coating to comply with NFPA-90A Standard.

4.9 ACCESSORIES

The following accessories shall include:

Vibration isolators.
Access doors

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4.10 Matching Condensing Unit

The Contractor shall supply & install condensing units with the AHUs serving Operation
Theaters as scheduled. The condensing units shall be composed of compressors matching
capacity with respective DX-coil, condenser coil, fans, refrigerant piping and electrical
component and etc, enclosed in a cabinet. The unit shall be factory assembled, internally
wired, refrigerant charged with 407 C, 410A or 134 A and shall be matching / suitable for
use to the twin circuit DX- coil of the indoor air handling unit, The unit should be
capable to operate at 115 F ambient temperature and shall be selected at saturation
Suction temperature 45 F.

The compressors shall be fully accessible, semi hermetic reciprocating/scroll type

equipped with crankcase heater, oil pump, refrigerant gas cooled motor, preset internal
relief valve, inherent thermister motor protection, suction & discharge service valves, oil
sight glass and shall be mounted on anti-vibration mounting.

The coils shall be air cooled with integral sub- cooling circuit, constructed of seamless
copper tubes mechanically bonded to aluminum fins with maximum 12 fins per inch The
coils should be tested for 450 psig. The unit shall be furnished with direct driven
propeller fans discharging air upward. The fans shall have permanently lubricated
bearings and inherent corrosion resistance shaft. The manufacturer shall statically and
dynamically balance each fan and the fan shall be provided with non-corrosive fan guard.
The fan motor shall be totally enclosed, 6 poles with class-F insulation and wired to the
unit control panel.

The refrigerant piping, hot gas discharge muffler and vibration eliminator shall be
fabricated from ACR grade copper.

The unit casing shall be made of galvanized sheet steel, dry powder coated to provide
anti-corrosive protection. The unit casing shall be provided with Access Panels for
maintenance purposes.

The unit shall have control panel, factory wired and shall contain individual electrical
components, contactors, overload relays, transformer, anti-recycling time delay relay,
control circuit disconnect switches, power and control terminal block, high/low pressure
switches and oil failure switch etc. complete in all respect to operate and maintain indoor
unit.

Air dampers shall have opposed airfoil blades, rotating in nylon bushes via glass
reinforced nylon gears. Blades material shall be Aluminum type. Blade length shall be
sectionalized to not more than 48 inch (1200mm).

Soft plastic profiles at the edges of the blades shall be provided to assure tight closure of
dampers. Dampers shall be inter-linked with galvanized steel pivot rod.

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5.0 FAN COIL UNITS

5.1 Duct Type Concealed Fan Coil Units

5.1.1 The Fan Coil Units shall be factory-assembled units of capacities and characteristics as
scheduled and shown on drawings, consisting of a hot dip galvanized metal sheet not less
than 20 US Gauge insulated from inside with expanded polyethylene.

5.1.2 The unit shall be of blow-through/draw thru design and shall be complete with a
combination chilled/hot water coil, motor(s), fan(s), drain pan with filter and filter box
complete. The unit shall have one or more quiet operating centrifugal fans directly
connected to extended-motor shafts. Motor fan assembly shall be easily detachable from
coil section.

5.1.3 The drain pan shall be made of hot dip galvanized steel sheets, protected against
corrosion and insulated with expanded polyethylene.

The unit motor shall have 3 speeds of operation.

5.2 Accessories:

The following accessories shall include:

(i) Auto air vent.

(ii) Thermostatic Control with Control Valve
6.0 HOT WATER GENERATORS

6.1 General

The H.W.G. shall be gas fired forced draft type, with capacity as shown in Equipment
Schedule and Drawings. The H.W.G. shall be constructed of welded steel upper and
lower headers connected with a high capacity down flow legs. Flexible water tubes of
26mm. O.D. having 12 gauge thickness formed in 3 pass heating boiler serpentine design
shall be push fitted to the headers. All tubes can be replaceable without any welding and
rolling involved through the front access panel. The entire tube area can also be easily
accessible for cleaning through front access panel.

6.2 Trim

The H.W.G. trim shall consist of, but not be limited to, the following items:
- Low water cutoff.
- ASME rated relief valve.
- Automatic gas valve.
- Gas shut off controls in case of failure of ignition
- Water temperature controls to regulate burner operation
- Gas line shut off valve
- Gas Pressure Regulator
- Gas Strainer

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- Gas Pressure Gauge

6.3 Heating Surface

H.W.G. shall be rated not less than 5 Square feet of heating surface per rated H.W.G.
horsepower. H.W.G. shall be complete package ready for field installation.

The hot water boiler shall be rated 0.03 m² of heating surface per kW.

6.4 Burner

The burner shall be suitable for natural gas with a calorific value of (915 Btuh/cu. ft). The
burner shall be integral with the front head of the H.W.G. and shall be high radiant
annular entry type for gas. The burner shall burn fuel without objectionable vibration or
pulsation with no carbon monoxide in the flue gases.

Burner shall have full modulation with automatic return to low fire position on every gas
cutoff for re-ignition.

6.5 Gas Supply System and Safety Arrangement

Gas valve shall be motorized remote controlled, spring loaded to close automatically in
the event of power failure. The gas train shall include manual shut-off valve, pressure
regulator, and gas manifold pressure gauge.

Manufacturer recommended gas pilot with automatic electric ignition and high-tension
transformer shall be provided. An electronic detector shall prevent the opening of gas
valve in the absence of pilot flame. Low fire ignition interlock and air flow safety switch
shall be provided.

6.6 Controls

H.W.G. controls to be of a manufacturer, which is adequately represented in Pakistan. A

certificate to this effect from H.W.G. controls manufacturer and local agent shall be
submitted. H.W.G. controls shall be suitable for intermittent start-stop operation of
H.W.G. as the H.W.G. will not be operating 24 hours a day.

6.7 Flue Collar

H.W.G. shall have flue collar for connection to Bracing with structural angle flange and
bolts.

6.8 Controls Panel

The control panel shall be factory fabricated supplied by the manufacturer of H.W.G.,
mounted on the H.W.G. panel shall include, but not be limited to, control circuit
transformer, relays, starters, timers, terminal strip, control circuit fuse, internal wiring,
on-off switch, indicating lights, meters for operating hours and number of starts.

Analog control panel shall be provided; there shall be "0-90°C operating thermostat" and
an "imit" thermostat that contains a "0-90°C operating thermostat and a 90-110 degree
safety thermostat" inside. It shall be the 0-90 degree operating thermostat that controls

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 Technical Specifications
Technical Requirements
the boiler. The thermostat shall be serving as safety is the operating and safety thermostat
that is called imit.

6.9 Breaching / Stack

The Contractor shall provide welded steel breaching/ stack for size and configuration as
required and as per recommendations of the manufacturer. Fabrication shall be by
welding using no less than 6mm thick plate conforming to ASTM A36 or A283.
Structural angle flanges for breaching and H.W.G. connection shall be provided. Stack
shall be terminated as shown on the Drawings.

7- HYDRONIC EQUIPMENT

7.1 Air Separators

The Contractor shall supply and install air separator for chilled/hot water system as
shown on the drawings. The air separator shall be of cylindrical design, vertical, with
inlet, outlet, drain and expansion tank connection. It shall be design fabricated, tested,
inspected for 125 Psi maximum water operating pressure.

7.2 Expansion Tanks

The Contractor shall provide and install as shown on plans pre-charged vertical /
horizontal steel expansion tank with replaceable heavy duty bladder. The tank shall be of
Welded Steel design and shall be built, tested and stamped in accordance with the ASME
BPV Code Section VIII, Division 1 and rated for working pressure of 150 psi. The shell
of the tank shall be constructed with carbon steel finished with grey primer finish. The
tank shall have top mounted carbon steel connection with flexible internal flow tube. The
bladder shall be replaceable type manufactured with high quality butyl rubber.
Acceptable volume of bladder shall not accede to 90% of tank capacity. The tank shall
also have top mounted air charging valve of dia ¼” protected with guard.

8- CENTRIFUGAL WATER PUMPS

Pumps shall be end-suction centrifugal type with casings designed for working pressure
at least one and a half times the total pressure on the casing. Flange connections shall
correspond to casing working pressure.

The Contractor shall submit the pump head calculations in accordance with the piping
layout finalized at site considering site conditions. Certified test curves of pump
performance shall be furnished for approval showing horsepower, total dynamic head and
efficiency versus water flow rate.

Each pump shall be driven by a constant speed motor through a flexible coupling. Motor
horsepower shall be selected in a way that the motor shall not be overloaded at any point
on the characteristic curve when operating at design speed.

Each pump shall be guaranteed to circulate not less than the quantity of water against the
required circulating head when operating continuously, without overheating the motor or

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 Technical Specifications
Technical Requirements
bearings, etc. When more than one pump is required to operate in parallel, the pumps
performance curves when operating in parallel shall be provided to show that required
flow at the specified head will be obtained. Pumps shall not transmit vibration to the
building and shall operate without producing noise, audible anywhere in the building,
outside the space in which the pumps are installed. Flexible connections shall be provided
at pump suction and discharge.

Chilled water, hot water and condenser water pumps shall have bronze impeller, stainless
steel shaft and mechanical seals.

Pump and motor shall be mounted on common base frame and shall have been factory
aligned.

Outdoor installed pumps shall be provided with rain protected canopy to avoid the entry
of rain water and to avoid the weather effects.

The Contractor shall be required to commission the pump as per manufacturer’s

recommendations. The pump test runs shall be carried out by the contractor and
comparison with operational curves submitted to the Engineer.

The chilled/hot condenser water pump shall be of KSB with SIEMENS motors.

The Tenderer shall supply the following information for each pump.

Make and model No.________________________________

Flow rate, US G.P.M._______________________________
Discharge head FT _________________________________
B.H.P. ___________________________________________
Type of motor and pump ____________________________
Manufacturer performance guarantee certificate and compliance certificate.

9- CHEMICALS & CHEMICAL FEEDERS

9.1 Chilled & Hot Water Systems

The contractor shall provide gravity bypass type chemical feeder for chilled & hot water
systems. Feeders shall be installed as shown on Drawings. Gravity Bypass Feeder shall
be of 5 US gallon capacity cast iron construction (or MS construction with inside epoxy
lining), complete with bottom drain tapping and couplings. The make of Feeder shall be
subject to Employer’s/Consultant’s approval.

Sufficient chemicals for Preliminary Tests, Pre-start & Commissioning Tests and for one
year of plant operation after commissioning shall be provided.

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 Technical Specifications
Technical Requirements
9.2 Condenser Water System

The Contractor shall provide continuous drip injection pump type chemical feeder for
condenser water system. The solution tanks shall be provided with the system with the
provision of injector pump feeder for continuous feeding of chemicals. No. of solutions
tanks shall be according to the manufacturer’s chemical feeding guidance. The chemical
feeder make shall be subject to Employer’s/Consultant’s approval.

Sufficient chemicals for Preliminary Tests, Pre-start & Commissioning Tests and for one
year of plant operation after commissioning shall be provided.

An automatic chemical feeding system shall also be provided along-with the chemicals &
chemical feeders. The automatic system shall comprise of a controller, conductivity
meter, relevant sensors, control valves etc. to make the system fully functional in
accordance with the controlled chemical feed rates.

10- VENTILATION AND EXHAUST FANS

10.1 General

10.1.1 The Contractor shall furnish and install ventilation and exhaust fans of the type and
capacity as specified and shown on the drawings. The Contractor shall be responsible for
the proper selection of the fans so that the specified operating conditions are obtained.
Motors shall be sized to provide the required Bhp for meeting the specified conditions
without overloading.

10.1.2 The fans shall be statically and dynamically assembled and tested in the factory. The fan-
motor set shall be selected for quiet operation. The bearings may be ball or roller type but
must be silent running, heavy duty, self aligned type, and to prevent leakage of oil or
grease, preferably sealed and permanently lubricated otherwise, requiring only annual
lubrication with oil or grease cups provided in easily accessible positions.

10.1.3 Fans used for exhaust shall be provided with autoclosing louvers and rain protection hood
of louvers, as specified on the exhaust side.

10.1.4 All fans shall be mounted on a rubber-in-shear or spring type vibration isolators, so that
the fan shall not transmit vibration to the building structure.

10.1.5 All the outdoor installed fans shall have weather proof construction and fan motors shall
be provided with rain protection canopy.

10.2 Duct In-line Centrifugal Fans

The contractor shall furnish and install duct mounted inline supply/exhaust air fans where
shown on the drawings of capacity and characteristics as schedule. The in-line fans shall
be direct driven centrifugal type light weight compact units.

The fan housing shall be galvanized steel skin securely attached to a galvanized steel
frame work. Easy access to motor, impeller and bearing for inspection and repair through
the door at the side of the fan shall be provided. Inlet venturi to be precision spun for

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 Technical Specifications
Technical Requirements
exact matching of the inlet to the wheel inlet. The aluminum wheel is to have backward
inclined blades designed for maximum efficiency and is to be dynamically balanced with
permanently affixed balance weights. Motors shall be open drip-proof type of the voltage
and phase as schedule. Units shall be AMCA certified for air and sound performance.

10.2.1 All fans supplied shall be of approved quality.

11.0 OPERATION THEATRE (OT) CEILINGS

The Operating Theatres shall be provided with, ventilation system for OP Theatres
“System Weiss” along with accessories inclusive of the following to maintain low germ
count level in the operating zone and to maintain pressure level.

It consists of the following:

1- Ventilation system for OP Theatres.

2- HEPA Filters of Class-14 having efficiency not less than 99.997%.
3- OP Fluff Separators for return/exhaust air.

11.1 Ventilation System for OP Theatres “System Weiss”

The ventilation system for OP Theatres shall be the type as per the requirement of each OP
Theatre and as specified, shall be furnished and installed in accordance with the following
components.

-- Pressure Chamber
-- Perforated Panels
-- Filter Frame and Housing
-- Opening/Port for OP Theatre Lamp
-- Test Port in Filter Housing

Pressure Chamber:

Made of stainless steel frame for receiving perforated panels and side cover to form a
pressure chamber.

The pressure chamber may be divided into parts for easy transportation to site of
installation. The parts could be such that they could be assembled easily at site.

Perforated Panels: are made of stainless steel, size 600mm x 600mm with special hinges
and chromed locks with position indication. The maximum air flow capacity per panel
shall be 80-100 Cu. meters per hour.

Nozzles: Made of stainless steel, size 50 mm diameter, two numbers shall be provided to
form supporting flow. The Nozzles shall be inclined and directed towards the head side
of the Operating Table.

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 Technical Specifications
Technical Requirements
Stainless steel frame and Housing: shall be provided to installs HEPA air filters. The
access to the frame shall be through the frame of the pressure chamber for easy
installation and removal of the HEPA filters.

Test ports across HEPA filters shall be provided to measure pressure drop across HEPA
filter.

Opening for OP Theatre Lamp: shall be provided of size 560 mm x 560 mm in the
pressure chamber at the desired place for the passage of the OP Theatre Lamp Shaft.

All hardware material require to suspend the pressure chamber shall be of stainless steel
and shall be provided by the supplier. The chamber should be freely suspended and the
aperture between the pressure chamber and surrounding false ceiling shall be sealed with
a permanent elastic substance.

11.2 HEPA Filters

The HEPA Filters shall be type Class-14 as manufactured by ‘Camfil’ Sweden,

Efficiency 99.997 percent, as per DOP test method, individually factory tested, made of
glass fibre media, plywood frame with polyurethane gasket on both side, suitable for
maximum working pressure of 1,000 pa at temp. 70°C with 70 percent RH. The initial
pressure shall be 250 pa and the recommended pressure drop across filter shall be 500-
600 pa.

The air velocity at the inlet of the filters should not exceed 1.5 meters per second and the
duct connection to the filter housing should be sized accordingly, with volume control
damper.

11.3 Fluff Separators

Fluff Separator as manufactured by “Weiss” maded stainless steel mesh and frame to be
installed at floor level at the exhaust/return air outlets of the OP Theatres. The size of the
Fluff separator shall be as per manufacturer’s recommendation for the designed
exhaust/return air volume through floor outlets. The initial pressure drop shall be 20 pa
and the final pressure drop shall be 125 pa.

12.0 SELF GENERATING STEAM INJECTION HUMIDIFIERS

Steam humidifier for distribution of humidity (steam vapor) into air-handling system
shall be of the self-contained, electronically controlled design suitable for duct mounting
along with Duct Mounted Steam Distribution.

 Humidifier shall generate steam from ordinary tap water.

 Humidifier(s) shall have all internal components contained in a steel cabinet with a key-
locked access door.
 Humidifier shall have full modulating control to provide 0 to 100% capacity.
 Maximum capacity of humidifier shall be self-regulated with no manual adjustment.

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 Technical Specifications
Technical Requirements
 Draincycle will be self-regulating for automatic control of mineral (conductivity) build-
up.
 Humidifier shall have programmed diagnostics to confirm that input and output circuits
are functioning.
 Humidifier shall have steam generator(s) that can be taken apart for inspection and shall
be of the cleanable type.
 The electronic circuit shall provide automatic protection from excessive electrode
current.
 The humidifier fill water line shall have an air gap to prevent backflow.
 Humidifier shall incorporate electrical terminals for installation of low-voltage controls.
 Humidifier shall be supplied with stainless steel steam dispersion tube and with
condensate connections.
 Capacity and data shall be as per schedule.

13. SOUND ATTENUATORS (DUCT SILENCERS)

13.1 General

Furnish and install "Clean-Flow" (rectangular) silencers of the types and sizes shown on
the plans and/or listed in the schedule. Any specification change must be submitted in
writing and approved by the Engineer, in writing, at least 10 days prior to the bid due-date.

13.2 Materials

13.2.1 Outer casings of rectangular silencers shall be made of 22 gauge type #G-90 lock-former-
quality galvanized steel.

13.2.2 Interior partitions for rectangular silencers shall be not less than 26 gauge type #G-90
galvanized lock-former-quality perforated steel.

13.2.3 Filler material shall be inorganic glass fiber of a proper density to obtain the specified
acoustic performance and be packed under not less than 5% compression to eliminate
voids due to vibration and settling. Material shall be inert, vermin- and moisture-proof.
Filler material shall be totally encapsulated and sealed with polymeric film of an
appropriate thickness. The encapsulated fill material shall be separated from the interior
perforated baffles by means of a noncombustible, erosion resistant, factory-installed,
acoustic stand-off. It shall not be acceptable to omit the acoustic stand-off and try to
compensate for its absence by means of corrugated baffles.

13.2.4 Combustion ratings for the silencer acoustic fill shall be not greater than the following
when tested to ASTM E 84, NFPA Standard 255, or UL No. 723:

Flamespread Classification . . . . . . . . . . . 20
Smoke Development Rating . . . . . . . . . . 20

13.3 Construction

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 Technical Specifications
Technical Requirements

13.3.1 Units shall be constructed in accordance with the ASHRAE Guide recommendations for
high pressure duct work. Seams shall be lock formed and mastic filled. Rectangular
casing seams shall be in the corners of the silencer shell to provide maximum unit
strength and rigidity. Interior partitions shall be fabricated from single-piece, margin-
perforated sheets and shall have die-formed entrance and exit shapes so as to provide the
maximum aerodynamic efficiency and minimum self-noise characteristics in the sound
attenuator. Blunt noses or squared off partitions will not be accepted.

13.3.2 Attachment of the interior partitions to the casing shall be by means of an interlocking
track assembly. Tracks shall be solid galvanized steel and shall be welded to the outer
casing. Attachment of the interior partitions to the tracks shall be such that a minimum of
4 thicknesses of metal exist at this location. The track assembly shall stiffen the exterior
casing, provide a reinforced attachment detail for the interior partitions, and shall
maintain a uniform airspace width along the length of the silencer for consistent
aerodynamic and acoustic performance. Interior partitions shall be additionally secured to
the outer casing with welded nose clips at both ends of the sound attenuator.

13.3.3 Sound attenuating units shall not fail structurally when subjected to a differential air
pressure of 8 inches water gauge from inside to outside the casing. Airtight construction
shall be provided by use of a duct sealing compound on the jobsite material and labor
furnished by the contractor.

13.4 Acoustic Performance

All silencer ratings shall be determined in a duct-to-reverberant room test facility which
provides for airflow in both directions through the test silencer in accordance with ASTM
Specification E477-99. The test facility shall be NVLAP accredited for the ASTM E477-
99 test standard. Data from a non-accredited laboratory will not be acceptable. The test
set-up and procedure shall be such that all effects due to end reflection, directivity,
flanking transmission, standing waves and test chamber sound absorption are eliminated.
Acoustic ratings shall include Dynamic Insertion Loss (DIL) and Self-Noise (SN) Power
Levels both for FORWARD FLOW (air and noise in same direction) and REVERSE
FLOW (air and noise in opposite directions) with airflow of at least 2000 fpm entering
face velocity. Data for rectangular and tubular type silencers shall be presented for tests
conducted using silencers no smaller than the following cross-sections:

Rectangular, inch: 24x24, 24x30, or 24x36, and

Tubular, inch: 12, 24, 36, and 48

13.5 Aerodynamic Performance

Static pressure loss of silencers shall not exceed those listed in the silencer schedule as
the airflow indicates. Airflow measurements shall be made in accordance with ASTM
specification E477-99 and applicable portions of ASME, AMCA, and ADC airflow test
codes. Tests shall be reported on the identical units for which acoustic data is presented.

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 Technical Specifications
Technical Requirements

13.6 Certification

With submittals, the manufacturer shall supply certified test data on Dynamic Insertion
Loss, Self-Noise Power Levels, and Aerodynamic Performance for Reverse and Forward
Flow test conditions. Test data shall be for a standard product. All rating tests shall be
conducted in the same facility, shall utilize the same silencer, and shall be open to
inspection upon request from the Architect/Engineer.

13.7 Duct Transitions

When transitions are required to adapt silencer dimensions to connecting duct work they
shall be furnished by the installing contractor.

14. ELECTRICAL DUCT HEATERS

Supply and install duct heater for winter heating size as per duct size, capacity as per equipment
schedule, with flanges for a duct connection for re-heating. The operating voltage 230/400v 50cy,
Circuit ∆/Y. The heater shall have stages, if scheduled, with number of heating grids as per
manufacturer. The temperature monitoring, limiting and safety controls shall be according to
VDE-DIN 57100 part 420, fire protection according to VDI 3803.

The monitoring and safety control should be ensured for minimum air velocity of Approx. 1.5-2
m/s.

The heater shall be provided with contractors and interlocking control with blower motors for
safety purpose as well.

The temperature controllers with accessories and auxiliary controls should maintain the desired
and set parameter of temperature of the system.

The duct heater and controls shall be type L-20 / Universal manufactured by “ Kuno Engels
Gmbh, volta Gmptl or approved equal.

15.0 AIR CURTAINS

15.1 Housing

Fan housing shall be constructed of heavy gauge galvanized sheet metal. Housing shall
have a baked enamel finish to protect from corrosion.

15.2 Motor

Motor shall be mounted on the end of the blower wheel in order to obtain uninterrupted
airflow along the length of the unit. Motor shall be of the external rotor type, with
permanently sealed self-lubricating ball bearings. Motor shall be equipped with automatic
reset thermal overloading protection, and acceptable for continuous duty.

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 Technical Specifications
Technical Requirements
15.3 Wheels

Blower wheel shall be of forward curved cross-flow type made of galvanized steel.

15.4 Electric Connection

The unit shall be equipped with factory installed electrical cord and 230 V grounded
plug.

15.5 Operation

Unit shall be equipped with built-in operating panel for manual operation. Toggle
switches shall have neutral position in the middle and shall be used to control the air flow
providing “off,” half and full speed positions.

15.6 Mounting

Unit shall be equipped with two fastening brackets to be secured to the wall. The unit
shall be adjustable in the angle from the wall adjustment screws located at the back side
of unit.

16.0 DUPLEX PUMP SET FOR DIESEL OIL TRANSPORTATION

16.1 Provide and install a factory assembled "Packaged" Duplex Fuel Oil Pump Set. The set
shall have all components mounted on a steel base support fabricated of 3/16" steel plate
with 3" steel side rails sealed to form a containment basin with 1/2" NPT plugged drain
connection. Containment basin shall encompass the entire perimeter of the duplex pump
set and no components or factory piping shall overhang. Pipe shall be schedule 40,
ASTM Grade A-53 Black pipe with 150#. (Option: Provide a float operated leak sensor
with protective shroud in the pump set containment basin to shut off the pumps and
energize an audible and visual alarm should a leak be detected.)

16.2 Provide bucket oil strainer, sized to produce less than 1/2 PSI pressure drop, through a
clean strainer basket with the maximum anticipated flow. Strainer shall be of one piece
cast iron and come complete with level wrench handle.

16.3 Provide two (2) Pedrollo peripheral impeller fuel oil pumps, each with a capacity of not
less than 50 Lit/Min @ 40 PSIG discharge pressure when operating with No. 2 oil (HSD).
Each pump shall be close coupled to a 1.1 HP 2,900 RPM totally enclosed fan-cooled
motor, capable of operating on 220/400 volt, single or 3 phase, 50 HZ electrical service.

16.4 Provide two (2) in-line, check valves with metal-to-metal lapped seat and 316 stainless
steel springs. Check valve is to have a minimum of 1/2 PSI cracking pressure and to
be located on the discharge side of each pump.

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 Technical Specifications
Technical Requirements
16.5 Carbon steel ball valves, class 150 shall be provided on both the suction and discharge of
each pump to provide pump isolation for service.

16.6 One (1) 2 1/2" compound gauge shall be provided on the suction side of system. Gauge
shall be liquid filled to dampen pulsation, with bright finish stainless steel case, brass
movement, and bronze bourbon tube. Gauge shall read 30" vacuum - 60 PSIG and shall
be mounted with isolation ball valve.

16.7 Two (2) 2 1/2" dial pressure gauges to be placed on discharge side of each pump. The
gauges shall be liquid filled to dampen pulsation, have bright finished stainless steel case,
brass movement and bronze bourbon tube. Gauge range shall be based on the fuel oil
system operating pressure and shall be mounted with isolation ball valves.

16.8 Provide pump set mounted system control cabinet to monitor and control the fuel oil
delivery system in response to day tank demand. Cabinet shall be completely pre-wired,
tested and shipped as an integrated system to insure jobsite reliability. Control strategy
shall be microprocessor-based and utilize a PLC (Programmable Logic Controller).
Relay logic is not acceptable. Cabinet enclosure shall be constructed of a minimum of 18
gauge steel, continuously welded and constructed to NEMA 3R standards. Cabinet
interior and exterior shall be primed and finished in durable chemical-resistant enamel
suitable for industrial environments. PLC shall have sufficient I/O to accomplish all
necessary control functions. The control strategy shall be burned into an EPROM at the
factory, and shall be safeguarded against re-configuration by unauthorized or unqualified
personnel. All cabinet front devices shall be identified by black labels with engraved
white lettering. Cabinet shall consist of but not be limited to the following:

 Microprocessor based PLC with pump alternation

 Magnetic motor starters with overload protection
 Motor circuit breakers
 Manual-Off-Auto illuminated mode selector switch for each pump
 Press to test button for all alarms and indicating lights
 Alarm silence / System reset push-button
 Alarm buzzer
 Discrete output for common alarm to interface with the BMS
 System indicating alarms as follows:
 Power on
 Pump set leak detected
 Day tank high level alarm
 Day tank low level alarm
 Day tank rupture basin leak detected alarm

16.9 The duplex packaged pump set shall be from Pedrollo West Europe or Simplex USA or
equal.

17. DIESEL OIL STORAGE TANKS

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 Technical Specifications
Technical Requirements
17.1 Under-Ground Diesel Oil Storage Tank

17.1.1 Diesel Bulk Tank

Diesel tank shall be of 15,000 liters capacity and shall have appropriate size to
accommodate the required storage capacity.

17.1.2 Painting

Tank shall be thoroughly cleaned. Sand blasted OR properly cleaned by sand paper. Than
cleaned by petrol. Apply first coat of red oxide, after proper drying apply second coat of
red oxide. Apply FIRST layer of coal tar epoxy (Baxley 204 from Berger), apply course
cloth and then apply second coat of coal tar epoxy.

Tank shall be coated with course cloth of 8 oz. between two layers of coal tar epoxy.

17.1.3 Manhole

Tank shall TWO open able manhole of size 900 X 900mm. One manhole shall have 4
nos. flanged opening of following sizes:

1) 40 DN for airvent. 2). 25 DN for supply. 3) 40 DN for return. 4). 50 DN for

metering.

Second manhole shall have 3 nos. flanged opening of following sizes:

1) 65 DN for inlet 2) 32 DN for drain opening. 3) 100 DN for level indicator.

all pipes shall be of schedule 40.

17.1.4 Construction

Fabricated by 6mm thick MS sheet for shell as well as for dish ends, with 3 nos. holding
strips of 65mm. Holding trips shall be jointed to tank by 300 wide plate X 600 mm
height.

These strips shall be bolted on both side of the tank to concrete. Tank shall have total six
legs. Three on each side with holding strips of at least 60mm.

All flanges shall be of class 150. All welds are in 6mm.

17.1.5 Tank Placement

Tank shall be placed on a concrete pad of 425 mm height with bracket like curve so that
the tank fixes properly on the curve.

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 Technical Specifications
Technical Requirements
17.1.6 Pressure Testing

Tank shall be pressure tested by nitrogen at more than 70 KPA pressure.

18.1 DAILY USE STORAGE TANK

18.2.1 The tanks shall be horizontal cylindrical storage type with dished heads. The daily use
tank shall be mounted on saddles.

18.2.2 Provide a 3,000 Liters capacity cylindrical type daily use tank constructed of 4mm thick
steel sheet, with channel side saddle supports, 1" NPT drains, 4" NPT
inspection/emergency vent ports, visual fuel level gauge and vent cap as shown on the
drawing. Tank exterior shall be finished with oil-resistant textured enamel paint.

18.2.3 Tank connections shall include fuel inlet, fuel supply, vent opening, manual fill, and
overflow as shown on the drawing. The tank shall also be provided with a man-hole on
the top side for cleaning purpose of adequate size.

18.2.4 The tank shall be installed at the roof of the HVAC plant room on a 4 inch high concrete
pad of base size according to the tank’s supports size.

19- AIR FILTERS

19.1 Furnish complete air filters for each air supply system of the specified capacities and
sizes as mentioned in the schedule and shown on the drawings.

19.2 The air Handling Unit shall be furnished with a filter section and a full set of performed,
pleated design 2” thick filters.

19.3 Each fan coil unit shall be furnished complete with a single aluminum, permanent,
washable 2” thick filter.

19.4 The air filters shall be permanent, cleanable, high velocities, viscous oil type, using a
media composed of corrugated strips of screen wire or sheet metal placed on edge of the
airflow. The corrugations shall be tapered to form a series of pyramid shaped pockets to
collect the dust from the air. Expanded metal shall be placed on both sides of cleaning
media to add strength and for mechanical protection. The filters shall be selected for face
velocity not exceeding 450 Fpm. The initial resistance shall be less than 0.10” Wg.

19.5 The unit filters shall be mounted in air tight, preferably flat otherwise angular, filter box
of galvanized steel or aluminum sheet, so that they can be removed from either end for
replacement or cleaning.

19.6 In selecting the sizes of the air filters the space available in air handling units etc. should
be kept in view.

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 Technical Specifications
Technical Requirements
19.7 All filters shall be cleaned and oiled before the Air Handling Units are commissioned.

19.8 The air filter shall be of approved manufacture.

20- SHEET METAL DUCTING

20.1 All sheet metal work for various air systems shall be furnished, installed, completely
connected, tested and adjusted.

20.2 The Contractor shall make shop drawings of all duct work and the same shall included
details of all splitters, takeoffs, vanes, dampers, elbows an all other necessary fittings
required for the proper operation of the air system. Drawings and other details shall be
submitted to the Engineer for approval before fabrication.

20.3 Exact dimensions and locations of diffusers, registers and grilles shall be, submitted to
the Engineer for approval, otherwise any changes directed after installation shall be made
without additional cost. For diffusers and registers adequate provision shall be made in
the neck connections for installation of deflectors and dampers.

20.4 All diffuser, register and grille necks/boxes must be tightly closed during construction to
keep out rubbish.

20.5 All ducts passing through walls shall have 20 gauge G.I. sheet sleeves, extending 1/4”
beyond the finished face of the wall both sides. The sleeves shall be of sufficient size to
cover duct insulation or any other duct covering and allow at least 1/8” clearance in the
sleeve for free movement of the ducting. The Contractor shall be responsible for
supplying, locating and setting of all necessary duct sleeves.

20.6 All sheet metal ductwork shall be fabricated from commercial quality prime finish
galvanized steel sheet conforming to ASTM A527 lock forming quality and having a
minimum zinc coating of 0.6 oz/ft² on both sides (refer zinc coating grade G60). The zinc
coating should be applied uniformly by continuous hot dip method to both sides of the
base metal so that the sheet metal can be drawn, formed, lock-seamed and spun without
danger of flaking or peeling of the zinc coating.

20.7 All ducting shall be substantially built with approved joints and seam, shall be made
smooth on the inside and neat on the outside. The duct joints shall be made as air-tight as
possible. The laps shall be made in the direction of air flow and no flaking shall project
inside the ducting.

20.8 Ducts, the width of the greater dimension of which exceeds 30 inches, shall be
constructed of not more than four feet sections. Ducts, the width of the greater dimension
of which is less than 30 inches, shall be constructed of not more than eight feet sections.

21.9 All elbows shall preferably be full radius type. If space does not permit, square elbows
may be used with double thickness, shop fabricated, turning vanes reverted with the

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ducting. Due to space limitations curved elbows with less than a full radius bend may
also be used provided single thickness turning vanes are installed in the elbow. Such
short radius elbows of size upto 40” - 60” shall have one and over 60” shall have two
single curved turning vanes spaced around 3 inches.

20.10 The supply and return air duct connections with the fans and equipment shall be made
through heavy-duty air tight at least 8 oz. weight canvas flexible connection, at least 4”
wide to prevent transmission of vibrations. The canvas collar shall be properly sewn and
clamped at both ends.

20.11 The ducts shall be adequately supported from galvanized iron hangers firmly fixed and
generally suspended from the building structure with the help of concrete inserts, bolts or
shooting bolts. The hangers and supports shall not pierce the insulation, which shall be
suitably protected and reinforced at that location. The bottom support AND HANGERS
SHALL BE OF 20-Micron GI Coating and shall be 1”x1”x 1/8” Galvanized iron for
ducts up to 12” wide. 1¼”x1¼ ”x 1/8” Galvanized Iron up to 30” width, 1 ½”x1 ½”x
1/8” Galvanized Iron up to 72” width and 2” x 3/16” Galvanized Iron upto 96” width.
Hangers shall be spaced on average at 10 feet centers with a hanger no further than 1 ft.
on each side of any changes of direction. Ducting passing through building expansion
joints shall be supported on either side of the joint. The hangers for horizontal ducts shall
be 3/8” galvanized round rods for ducts upto 30” wide, 1/2” round rods or 1-1/2” x 1/8”
galvanized iron C-channel upto 72” width and 1-1/2” x 3/16” galvanized iron C-Chanell.
96” width. The vertical ducts shall be supported at each floor with GI c chanell or
supports resting on the slab and bolted with the duct bracing of GI-channel riveted with
the duct. Perforated band or wire shall not be used in any circumstance for supporting
ducts.

20.12 The ducting shall be fabricated according to the following schedule:

Rectangular Ducting
to 8” larger dimension 26 gauge
9” - 27” “ 24 “
28” - 51” “ 22 “
52” - 81” “ 20 “
87” to above “ 18 “

20.13 The ducts shall be fabricated with following type of joints or as approved:

(a) Longitudinal:

Pittsburgh lock, double seam, or grooved seam.

(b) Circumferential:

Duct larger dimension to 23” Drive slip

24” - 42” 1” high pocket lock or standing

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seam
43” - 72” 1-1/2” high pocket lock
standing seam.

20.14 The bracing for ducting shall be as follows:

Duct larger dimension Size of Engineered G.I Framing

To 27” None

27” - 30” Joints at 4’ centers without

bracing or joints at 8’ centers
with 1” x 1” x 1/8” bracing
between joints.

31” - 42” 1” x 1” x 1/8” at 4’ centers

43” - 72” 1-1/2” x 1-1/2” x 1/8” at 4’

centers

20.15 Special joints, bracing and hangers, as specified by the Engineer, shall be used for ducts
with larger dimension over 96”.

21.0 ROUND FLEXIBLE DUCT

Supply and install pre-insulated flexible duct as and where shown on the drawings.

The duct shall be fabricated with extremely strong woven fiberglass fabric, with a flame
resistant coating & permanently bounded to a coated spring steel wire helix, with a bi-
directional metallic reinforced vapor barrier, with a stand-up beam. The duct shall be
factory insulated with one inch fiberglass insulation with a vapor seal. Duct and
insulation shall comply with NFPA-90A and be listed as class-1 air duct under UL
Standard 181. Also the duct shall be suitable for the temperature range from 20 0F to
2500F and velocity upto 5000 fpm. Positive pressure 10 inches and negative pressure 1
inch. Flexible duct shall be similar to model M-KC thermo flex Duct manufactured by
Flexible Technologies, USA.

Limit length of the flexible duct to not more than 4 feet, unless otherwise shown on
drawings.

Securely fasten the flexible duct run-outs to sheet metal collars. Slip the flexible duct
over a matching sheet metal collars and clamp the flexible duct with a galvanized steel
jubilee clamps.

Provide slack in duct @ 20% (twenty percents).

22- DUCT FLEXIBLE CONNECTION

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Flameproof flexible connections shall be furnished and installed on all suction and
discharge connections of fans and air-conditioning units for presentation of transmission
of vibration through the ducts to occupy spaces.

Flexible connections also be provided wherever ducts cross building expansion joints.
Flexible connections shall be factory fabricated from Cotton Cloth as specified above or
chemically impregnated canvas if approved by the Employer/Consultant. Connections
shall fit closely and are to be secured in an airtight fashion at connections to ductwork,
fans and apparatus. The unclamped section of the flexible connection between apparatus
and ductwork shall not be less than 150mm (6 in.) in length. Flexible connections shall
not be painted or insulated. Samples of the material shall be presented to the
Employer/Consultant for approval before installation.

23.0 DAMPERS

23.1 VOLUME CONTROL DAMPERS

23.1.1 Furnish and install all dampers of the specified capacities and sizes as shown on the
drawings, complete in all respects.

23.1.2 All dampers shall be of rigid construction, free of vibration, balanced, and control air
volume properly.

23.1.3 Splitter dampers shall be fabricated of sheet metal, two gauges heavier than the duct
gauge in which the damper is installed. The damper shall be fabricated of wood of an
aerofoil shape, over which sheet metal shall be formed to completely cover the wood.
The damper shall be operated by a 3/16 inch rod brought through the side of the duct with
brass locking set-screw and bushing. The bushing shall be of thickness equal to the
thickness of the duct insulation. The locking set screw shall be 1/4”, arranged for easy
locking of the damper operator at the desired position. The damper shall be installed with
a full length hinge. Rubber gaskets shall be installed to minimize air leakage. The damper
operator shall be galvanized and shall be designed for convenience of operation.

23.1.4 The quadrant volume damper shall be multi-leaf, opposed blade type, with a maximum
blade width of 8 inches. The damper shall be constructed of sheet metal, two gauges
quadrant operators manufactured of brass. Operators shall be provided with stand off
mountings on thermally insulated ducts to provide clearance between the duct surface and
operator, equal to the thickness of the insulation. The quadrant operator shall be heavy
duty, capable of being locked at desired position conveniently. Dampers, after
fabrication, shall be provided with a baked enamel finish.

23.1.5 Duct test holes, with patches or threaded plugs in ducts and plenums, shall be provided,
where directed or necessary, for using pitot tubes for taking air measurement to balance
the air systems. At each of these locations where ducts or plenums are insulated,
extensions shall be provided with plug fittings.

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23.1.6 All dampers shall be of approved quality to meet the Consultant’s satisfaction.

23.2 FIRE DAMPERS

Fire dampers shall be provided where shown on drawings. Fire dampers shall be
automatic operating type approved for the protection of openings in one hour fire-rated
walls and partitions. Suitable handhole openings with tightly fitted access covers shall be
provided in the fire dampers to make all fire dampers accessible for inspection and
maintenance. Unless otherwise shown, the installation details given in SMACNA Fire
Damper Guide for the dampers shall be followed except minimum thickness of metal for
all sleeves provided for the fire dampers shall be not lighter than 14 gauge (1.90mm). All
necessary items associated with the fire doors and fore dampers such as retaining angles,
sleeves, breakaway connections and access doors shall be provided. The fire dampers
shall have a mechanism to show the open-closed status of the fire dampers by means of
an indicating lever visible while opening access door in false ceiling.

Materials shall be as follows:

-- Casing steel, minimum 12 gauges

-- Blade steel, minimum 12 gauges
-- Fusible Link to operate at 70 0C
-- Bushes Stainless Steel

24- AIR DEVICES

24.1 Furnish where shown on drawings, all ceiling diffusers, all grilles, registers and louvers
of sizes, capacities and types as specified.

24.2 The Contractor shall check and confirm with the air devices manufacturer that proposed
diffusers, grilles and registers shall meet the capacity and “throw” requirements, without
draught, dead spots and noise.

24.3 All air devices shall have a sponge rubber gasket around the perimeter for tight fit against
adjoining structure.

24.4 Diffusers shall be round, square, rectangular or linear and furnished with multi-louver
type volume dampers in neck controlled from face of the diffuser.

24.5 All wall type supply air grilles and registers shall have horizontal and vertical adjustable
deflecting bars, and registers shall also have opposed blade volume control dampers,
adjustable from the face with a removable key. Registers and grilles shall have a
minimum of 75% free area.

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24.6 All return grilles shall be of the fixed bar type to match supply out-lets and have a
minimum of 75% free area. Return air registers, with opposed blade volume control
dampers, adjustable from the face, one to be fixed where shown on the drawings.

24.7 All air devices shall be thoroughly cleaned, given anti-corrosion chemical treatment, one
coat of acrylicmelamine based baked primer and finished with anticorrosion and weather
resistant acrylic-melamine plain or styrenated alkyd hammer baked enamel paint of
approved colour.

24.8 The fresh air intake and exhaust discharge louver shall be fixed where shown on
drawings. These louvers shall be of fixed blades, angled to provide adequate weather
protection and a free area of not less than 70%. They should be constructed, unless
otherwise specified, of aluminum with vertical supports as necessary to ensure complete
rigidity.

24.9 Registers and grilles on sidewalls shall be fixed on approved wooden frames. Perfect
alignment and symmetry shall be maintained.

24.10 Unless otherwise specified, all grilles, registers, diffusers and louvers shall be of
Aluminum, local manufacture of approved design and quality.

25.0 DUCT THERMAL INSULATION & SOUND LINER

25.1 Duct Insulation

No insulation shall be applied to any ductwork, or to any surface, until all foreign matter
has been removed from the surfaces to be installed. All insulation shall be applied in a
manner consistent with good practice and methods. Before applying insulation the whole
ductwork shall be pressure tested and perfectly sealed with silicon gum or with any other
purpose made duct sealant, to be approved by the Project Engineer, around all the joints
and possible leakage points.

The insulation shall be continuous through floors, walls, partitions, etc., except when
otherwise indicated or specified. Where space will not permit application of insulation in
wall or slab chase, the chase will be packed full of 85% magnesia mineral wool, asbestos
rope, or fiberglass and protected with cover plates, as approved by the MES/Consultants.

All indoor installed ducts shall be insulated with ½ inch(12mm) thick FM approved self-
adhesive cross-linked closed cell polyolefin foam insulation with factory applied Alupet
foil of density 25 Kg/m3 and thermal conductivity of 0.035 w/m °C at 23 °C and shall
have fire resistance of Class “O” rating. The insulation joints shall be secured with 2-3
inch wide self-adhesive tape of similar Alupet foil.

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The external and weather exposed insulated ducting shall be insulated as specified above
with minimum 1.0 inch (25mm) thickness and then protected with 26 gauge G.I sheet
cladding. All the joints along cladding shall be filled with water resistant filling material
to avoid water seepage.

The duct insulation shall be of approved manufacture.

25.2 Sound Liner

Supply and install sound liner upto a length of 15 ft. from fan discharge / suction
connections of each air-handler and at locations where specified. The liner shall be ¼”
(6mm) thick fiber free, super silent and Microbe resistant synthetic rubber foam having
density of 110 Kg/m3. The liner shall be capable of withstanding an air velocity of 4000
FPM. The liner shall adhere to all interior sides of duct with 75% coverage of fire
retardant approved adhesive. Mechanical fastening on a maximum of 18% center in ducts
exceeding 24” shall be provided.

26- PIPING, HANGERS AND SUPPORTS

26.1 All piping shall be properly supported or suspended on stands, clamps, hangers, etc. of
approved design. Supports shall be designed to permit free expansion and construction
while minimizing vibration. Pipes shall be anchored while minimizing vibration. Pipes
shall be anchored, where shown or where directed by means of steel clamps securely
fastened to the pipe and rigidly attached to the building construction.

26.2 Screw threads shall be cut clean and true, screw joints made tight without caulking and
without red or white lead. No bushing shall be used to change pipe size. Reductions to be
made with eccentric reducers or eccentric fittings. All pipes 2 inches and less shall be
reamed out after cutting to remove all burrs.

26.3 The drawings indicate generally the size and location of piping as designed for space
conditions, ceiling heights, etc. and may not be changed until coordinated with other
contractors. The pipe work shall conform fully to the following requirements.

26.4 The piping shall be properly graded to secure easy circulation and prevent noise and
water hammer. As much pitch as space conditions permit, to the point where vent relief,
drip and drain connections are provided. Cap dirt pockets at all riser heels, low points and
other places where dirt and state may accumulate. Proper provision for expansion and
contraction in all portions of pipe work to prevent under strains on piping or apparatus
connected there with, shall be made. Double swing at riser transfer wherever possible to
take up expansion shall be provided. Expansion joints and loops where indicated shall be
installed.

26.5 Approved screw unions, with steel or bronze bodies and ground brass taper or spherical
joints, shall be installed at traps, instruments, etc., and wherever else direction to permit
easy connection and disconnection.

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26.6 All pipe work shall be so arranged and put together as to prevent undue strains or leaks
caused by expansion and contraction. Riser branches and other offsets made up with 4
elbow swings wherever possible. Riser branches arranged to take up motion of risers and
mains.

26.7 To meet job conditions, the water supply and return mains shall be set up and down
where directed. In any such case, provide drain cocks at low points and vent traps at high
points.

26.8 The connection to water supply and return mains shall be made at sides, vertically or at
45 degrees, as shown or directed (generally at 45 degrees). Vent connections at all high
points, connected to expansion tank as shown or directed.

26.9 Alterations - If after plant is in operation, any coils do not circulate quickly and
noiselessly (due to trapped or airbound connections), the Contractor shall make proper
alterations in these defective connections. If connections are concealed in furring, floors
or ceilings, he shall bear all expense of tearing up and refinishing construction and finish.

26.10 All piping passing through floor construction shall have No. 20 U.S. gauge galvanized
irons sleeves the full depth of the floor construction. Any sleeves in wet areas, such as
equipment rooms, shall extend 1 inch from floor thickness, and space between pipe and
sleeve shall be caulked water tight.

26.11 Visible piping passing through finished floors and ceilings shall be provided with
escutcheons. Escutcheons shall be bell shaped, with plated finish and shall be fastened to
pipe.

26.12 Sleeves for exposed horizontal pipes passing through partitions shall be galvanized steel
pipe with heavy spun metal, and set-screwed to the pipe on each side of partition.

26.13 All sleeves shall be of sufficient size to include pipe covering.

26.14 All sleeves shall be furnished, located and set up by the Contractor and he shall be
responsible for the accuracy of their location when concrete is poured.

28.15 Piping or ductwork passing through water proof construction will be counter flashed.

26.16 Any piping run underground shall be painted with two heavy coats of asphaltum paint.

_____________________________________________________________

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 Technical Specifications
Technical Requirements
Service Material Type Weight
_______________________________________________________________

Chilled/Hot water Mild Steel Black Seamless Schedule 40

Condenser water Mild Steel Black Seamless Schedule 40
Drains (Risers & Mains) Mild Steel Galvanized Schedule 40
Drains (Branches) Mild Steel Galvanized Medium
________________________________________________________________

26.17 Provide suitable and substantial minimum 20-micron galvanized coated iron hangers and
supports for all horizontal piping. Piping shall be carried by pipe hangers supported from
concrete inserts. In general, supports for pipes shall be not more than 10 feet apart for 4
inches and larger pipes, and not more than 8 feet apart for 3 inches and smaller according
to the conditions of the job.

26.18 The Contractor shall furnish and set all concrete inserts and shall be responsible for such
inserts being in place when concrete is poured. Inserts shall be of approved quality and
shall be constructed of malleable iron and shall have space for rods of all sizes. On all
inserts for pipes 3 inches reinforcing rods of 5/8 inch diameter through the slot shall be
provided for this purpose.

26.19 All concrete inserts shall be placed in forms, in ample time to permit the Contractor for
the general construction to perform his work on scheduled time.

26.20 All vertical piping shall be supported by heavy pipe clamps resting on the building
construction.

26.21 No piping shall be hung from other piping. Piping shall be supported from the building
structure. Hangers shall be of heavy construction, suitable for the size of pipe to be
supported. All materials, except rollers, shall be prime quality heavy duty galvanized
iron. Hangers for pipe upto and including 5 inch size, shall be swivel ring, split ring or
adjustable clereis type. Hangers for larger pipes shall consist of two rods and cross rod
with cast iron pipe roll.

26.22 Hangers for insulated piping shall support the pipe without piercing the insulation. Cold,
insulated pipes shall be provided with a section of work on of each hanger insulation.
Hot, insulated pipes shall be provided with insulation saddles at each hanger. Saddles
shall be spot-welded to the pipe.

26.23 The contractor shall provide manufacturer’s catalogues and literature as applicable.

27.0 VALVES AND FITTINGS

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 Technical Specifications
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All Flanged End Valves must have Ductile Iron ENGJS400/500 composition & must be
Non Breakable. Similarly all the threaded valves shall be Bronze material. Valves shall
have following specific requirements:

GATE VALVES:
Handwheel Operation: Rising Stem or Non Rising Stem, (as specified in design)
Pressure Rating: Minimum PN16 equal to (232 Psi) & maximum Class 150
equal to (285 Psi)

DN65 & ABOVE:

Flange to Flange: EN558-1(3) comply to EN1171, API 600
Body & Bonnet Material: Ductile Iron ENGJS400/500, Bolted Bonnet
Seats & Stems Material: Bronze & must be renewable
End Connection: Flange Type
Flange Holes Drilling: PN16 EN 1092 or ANSI 16.5 Class 150 (as specified in
design)
Painting: Quality Epoxy Paint, minimum 300 microns thickness

DN50 & BELOW:

End to End: EN 12288-1, BS 5154 or equal
Body & Bonnet Material: Bronze
End Connection: Threaded Type

GLOBE VALVES:
Pressure Rating: Minimum PN16 equal to (232 Psi) & maximum Class 150
equal to (285 Psi)

DN65 & ABOVE:

Flange to Flange: EN558-1(1) comply to EN13789
Body & Bonnet Material: Ductile Iron ENGJS400/500, Bolted Bonnet
Seats & Stems Material: Bronze & must be renewable
End Connection: Flange Type
Flange Holes Drilling: PN16 EN 1092 or ANSI 16.5 Class 150 (as specified in
design)
Painting: Quality Epoxy Paint, minimum 300 microns thickness

DN50 & BELOW:

End to End: BS 5154 or equal
Body & Bonnet Material: Bronze
End Connection: Threaded Type

NON RETURN OR CHECK VALVES:

Pressure Rating: Minimum PN16 equal to (232 Psi) & maximum Class 150
equal to (285 Psi)

DN65 & ABOVE:

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 Technical Specifications
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Flange to Flange: EN558-1(10) comply to EN12334, ANSI 16.10
Body & Bonnet Material: Ductile Iron ENGJS400/500, Bolted Bonnet
Disc Seat Rings Material: Bronze & must be renewable
End Connection: Flange Type
Flange Holes Drilling: PN16 EN 1092 or ANSI 16.5 Class 150 (as specified in
design)
Painting: Quality Epoxy Paint, minimum 300 microns thickness

DN50 & BELOW:

End to End: BS 5154 or equal
Body & Bonnet Material: Bronze
End Connection: Threaded Type

STRAINERS:
Pressure Rating: Minimum PN16 equal to (232 Psi) & maximum Class 150
equal to (285 Psi)

DN50 & ABOVE:

Flange to Flange: EN558-1(1) comply to EN13789
Body & Bonnet Material: Ductile Iron ENGJS400/500, Bolted Bonnet
Perforated Mesh: Stainless Steel 304 - Stainless Steel 316
End Connection: Flange Type
Flange Holes Drilling: PN16 EN 1092
Painting: Quality Epoxy Paint, minimum 300 microns thickness

DN50 & BELOW:

End to End: BS 5154 or equal
Body & Bonnet Material: Bronze
Perforated Mesh: Stainless Steel 304 - Stainless Steel 316
End Connection: Threaded Type

BALANCING VALVES OR CIRCUIT SETTERS:

Pressure Rating: Minimum PN16 equal to (232 Psi) & maximum Class 150
equal to (285 Psi)

DN50 & ABOVE:

Flange to Flange: EN558-1(1) comply to EN13789
Body & Bonnet Material: Ductile Iron ENGJS400/500, Bolted Bonnet
Disc & Disc Rings: Cast Iron Disc, PTFE Disc Rings, or complete Bronze
O Ring: EPDM or PTFE Teflon
Indicator: ABS
Bushing: Bronze
End Connection: Flange Type
Flange Holes Drilling: PN16 EN 1092
Painting: Quality Epoxy Paint, minimum 300 microns thickness

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 Technical Specifications
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DN50 & BELOW:
Pressure Rating: Minimum PN25 equal to (360 Psi)
Body & Bonnet Material: Bronze
Indicator: ABS
End Connection: Threaded Type

Ball Valves: Used for all type of drains

Pressure Rating: Minimum PN16 equal to (232 Psi) & PN25 equal to (360 Psi)

DN65 & BELOW:

Body: Bronze
Body Style: Two piece full port
Ball: 304 stainless steel
Lever: Aluminum
Seat: Reinforced Teflon

27.1 Hand valves and check valves shall be furnished and installed as shown on the drawings,
required or directed.

27.2 All valves for throttling service in pump discharge, chiller and as so noted on the
drawings, shall be of the globe type.

27.3 Check valves in horizontal position shall be 150 deg swing, check valves in vertical
position and pump discharges shall be balanced check valves of the low pressure drop
type.

27.4 Provide all necessary manual or automatic vent valves, drain valves, in equipment rooms
more than 6 feet above floor.

27.5 Furnish and install all other hand valves, check valves, cock, etc., as required for the
complete and proper valving of the entire installation as defined herein.

27.6 Chilled water piping connections to air conditioning units shall include all necessary gate
valves, air vent valves, drain connections, lock shield valves and the automatic valves
arranged as detailed on the drawings. Lubricated plug cocks may be used in place of lock
shield valves, 3 inches and up.

27.7 Inverted ball float traps shall be used for venting water mains at all high points and
wherever else required, or as directed. Traps shall be 3/4 inch and of approved quality.

27.8 Drain cocks, with threaded ends for hose connection, shall be provided for any low points
in the water and return main, where directed.

27.9 Compression type, key-operated, air cocks shall be furnished and installed where shown
and where required for venting. Cocks shall be 1/4 inch in size and shall be of all bronze
construction. At least two dozen keys shall be delivered to the owner’s representative for
operating these cocks.

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27.10 All Ductile Iron body valves shall have renewable bronze seat rings and bronze spindles.
They shall have the self-packing feature so that they can be packed while open and under
pressure.

27.11 Furnish and connect to all valves, except valves at equipment, brass tags, polished or
lacquered with stamped lettering or numbers filled in with black paint. Also furnish a
schedule of all valve tags, framed in a polished hardwood frame and covered with plate
glass.

27.12 All strainers in water lines shall be y-pattern, set in a horizontal (or vertical downward)
run of the pipe. Where this is not feasible, strainers may be of enlarged cross-section flat
type. In all cases, strainers shall be arranged so as not to “trap” pipes and to facilitate
disconnection and opening up for cleaning.

27.13 All strainers shall have cast iron or bronze bodies of ample strength for the pressure to
which they shall be subjected, removable cylindrical or conical screens of nickel, copper
or brass, and suitable flanges or tapings to connect with piping they serve. They shall be
of such design as to allow blowing out of accumulated dirt and to facilitate removal and
replacement of a strainer screen, without disconnection of the main piping.

27.14 Standard features for pipe fittings are given in the table below:
_____________________________________________________________________
Service Size Material Type Weight
______________________________________________________________________
Chilled/Hot Water Upto 2 in. Cast iron Screwed 125 Lbs
2.5 in & up Steel Welding Standard
Condenser Water Upto 2 in. Cast iron Screwed 125 Lbs
2.5 in & up Steel Welding Standard
Drains (Steel Pipe) All Cast iron Galvanized Standard

27.15 All steel welded elbows shall be of the long radius type, except where conditions do not
permit.

27.16 The Contractor has the option of welding steel pipe 2 inches in size or larger. Where
welding is used, fitting shall be Tube Turn or as approved. “Weld-0-lets” may be used
where fittings of standard sizes are not available, and where authorized. No other type of
welded joint is acceptable. All hob welding shall be by the electric arc welding process in
accordance with the following:

(a) All joints 45 degree level type. Pipe mill-beveled or machine-beveled by the Contractor.

(b) All scale and oxide removed with hammer, chisel or tile and bevel left smooth and clean.

(c) Pipe lengths lined up straight with abutting pipe ends concrete.

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(a) Both conductors from the welding machine shall be extended to the location at which the
work is performed and shall be taped or held together so as to prevent induced currents in
structural steel, in piping or in other metals within this building. The ground lead shall be
connected to lengths of pipe with suitable clamps in such manner that welding current
will not flow through joints in pipe, structural steel of building or steel pipe supports.

(b) Weld metal must be thoroughly fused with base metal at all sections. Welds shall be of
sound metal, free from laps, slag inclusions or other defects.

(c) All welders shall be fully qualified and approved for such work.

28.0 PIPE INSULATIONS

All insulating materials required for piping, mechanical equipment, ductwork, etc., shall
be furnished and installed under this Contract. The execution of the work shall be by the
insulation manufacturer, in strict accordance with the best practice of the trade and the
intent of this specification.

All type of pipes shall be insulated and covered as called for in the schedule of insulation
given in last paragraph of this clause. All the insulation joints shall be sealed with two (2)
inch wide self-adhesive Alupet foil tape.

Chilled Water Piping which is exposed to view or exposed to weather, or called to be

weather-proof, shall be covered, in addition to insulation and finishes, with G.I. sheet
cladding.

All vapor barriers shall be completely sealed against moisture penetration.

The chilled / Hot Water piping & condensate drain piping shall be insulated with pre-
fabricated panels of sectional insulation of FM approved cross-linked closed cell
polyolefin foam type with factory applied Alupet foil of density 25 Kg/m 3 and thermal
conductivity of 0.035 w/m °C at 23 °C and fire resistant of Class “O” rating. The
thickness shall be as specified in the schedule of pipe insulations mentioned hereunder.

The schedule of pipe insulations shall be as under:

Piping Place Of Insulation Pipe Insulation Insulation Protection

Installation Type Size Thickness
Chilled Closed Cell 0.75” 3/4”
Water Piping Indoor Polyolefin to 2” (19mm) Factory Applied Alupet
Density 25 Foil
kg/m3
Chilled Closed Cell 2.5” to 1.0”
Water Piping Indoor Polyolefin 4” (25mm) Factory Applied Alupet
Density 25 Foil
kg/m3
Chilled Closed Cell 5” to 1-1/4” Factory Applied Alupet
Water Piping Indoor Polyolefin 24” (32mm) Foil
Density 25

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 Technical Specifications
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kg/m3
Chilled Outdoor, Closed Cell Factory Applied Alupet
Water Piping AHU rooms Polyolefin 0.75” 1.0” Foil Plus 26 Gauge
and Central Density 25 to 2” (25mm) G.I. Sheet Cladding
Plant Room kg/m3
Chilled Outdoor, Closed Cell Factory Applied Alupet
Water Piping AHU rooms Polyolefin 2.5” to 1.5” Foil Plus 26 Gauge
and Central Density 25 24” (38mm) G.I. Sheet Cladding
Plant Room kg/m3
Condensate Closed Cell All 3/8”
Drain Piping Indoor Polyolefin Sizes (9mm) Factory Applied Alupet
Density 25 Foil
kg/m3
Condensate Closed Cell All 3/8” Factory Applied Alupet
Drain Piping Outdoor Polyolefin Sizes (9mm) Foil Plus 26 Gauge
Density 25 G.I. Sheet Cladding
kg/m3

29.0 INSTRUMENTS & GAUGES

29.1 Temperature Gauges (Thermometers)

Thermometers shall be provided and installed in pipeline services in the locations

indicated on the Contract Drawings.

Right angle or obtuse angle thermometers shall be provided for fitting to vertical faces.

Thermometers fitted more than 80-inches above the floor shall be of the dial type.

Thermometers in low temperature hot water, chilled and condenser water systems shall
be of the mercury in glass type, at least 12-inches long, accurate to ± 0.50C and scaled
appropriately.

Dial thermometers for distance reading shall be provided with the necessary length of
non-corrodible capillary tube encased in non-corrodible armored sheath. All connecting
tubes shall be neatly clipped to walls etc. with purpose-made clips spaced at not more
than 300mm. Thermometers that are to be wall mounted shall be fixed to hardwood
boards fixed securely to the wall.

29.2 Pressure Gauges

Pressure gauges shall be provided at the suction and discharges of all pumps.

Pressure gauges shall be provided to measure the static pressure drop across plant and
equipment such as evaporators and condensers.

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Pressure gauges on pumps and other equipment shall be 4-inches dial type having brass
cases with a polished and lacquered finish. Bourdon tubes shall be of solid drawn
phosphor bronze. Dials shall be white heat-resisting enamel with black figured scales.
Gauges shall be accurate to ± 1% of scale range, between the 10% and 90% positions of
the scale.

All gauges shall be fitted with a lever handled plug cock. Dial gauges, for distance
reading shall be mounted on wall-fixed hardwood boards.

30- ELECTRICAL WORKS

30.1 SCOPE

(a) The Contractor shall supply all panel boards, starting, equipment, circuit breakers, busses,
isolators conducting cables, wiring, conduits and all other items necessary required as per
schematic drawings for the entire HVAC System except exclusions described hereinafter:

“Supply and installation of power cables upto points indicated in Electrical Distribution
Schematic Diagram shown/noted on Drawings”.

(b) The earthing system shall consist of supply and installation of earth electrodes, earth
connecting points, earthing leads and earth continuity conductor and running earth
conductor all along the cable length. All material such as earth continuity conductors,
earth connecting points, earthing lead and earth electrode including the installation
material and accessories shall be supplied and installed by the Contractor as specified,
except the exclusions described hereunder:-

“Earthing System upto the power cable terminating points provided by others and
indicated/noted in Electrical Distribution Schematic Diagram as shown on Drawing.

30.2 ELECTRICAL EQUIPMENT & CONTROLS

30.2.1 Scope
(a) The Contractor shall supply all panel boards, starting, equipment, circuit breakers, busses,
isolators conducting cables, wiring, conduits, etc., for the entire HVAC System except
exclusions described hereinafter:

“Supply and installation of power cables upto points indicated in Electrical Distribution
Schematic Diagram shown on Drawings”.

For further details refer to Clause 21.3 “Distribution and Control Scheme”.

(b) The earthing system shall consist of supply and installation of earth electrodes, earth
connecting points, earthing leads and earth continuity conductor and running earth
conductor all along the cable length. All material such as earth continuity conductors,
earth connecting points, earthing lead and earth electrode including the installation
material and accessories shall be supplied and installed by the Contractor as specified,
except the exclusions described hereunder:

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“Earthing System upto the power cable terminating points provided by others and
indicated in Electrical Distribution Schematic Diagram as shown on Drawing”.

30.2.2 General

All apparatus and equipment specified hereinafter in this section shall fully conform to
latest IEC, BS and VDE standards to the extent applicable to each type and class of
equipment and apparatus described and individually bear the seal of manufacturer. In
case of any conflict, in different standards IEC standards shall prevail. However, all
requirements of Pakistan Electricity Act/Rules and other local authority must be met.

All such switchgear, components related to one category, apparatus and materials shall be
of one and the same manufacturer to the maximum extent possible.

The types, class and catalogue numbers, wherein stated are employed to establish the
class and quality of apparatus and equipment required for this work.

30.2.3 Applicable Standards and Codes

Following latest standards, codes, rules and regulations shall be applicable:

International Electrotechnical Commission (IEC) standards

British Standard Specifications (BSS) and Code of Practices

Pakistan Standard Institution (PSI)

Electrical Installation of Buildings (IEC-364)

Institution of Electrical Engineers, United Kingdom “Wiring Regulation for Electrical

Installations”

Pakistan Electricity Act 1910

Pakistan Electricity Rules 1937

30.2.4 Applicable Standards to Equipment and Material

Latest revision of following standards shall be applicable to equipment and material

specified:

LV Circuit Breakers IEC 947

Earth Leakage Circuit Breakers IEC 1008 and IEC 1009

LV Switch Disconnectors IEC 947-3

Earth Leakage Switch Disconnectors IEC 1008

Enclosures: Degree of Protection IEC 529, BS 5420

LV Switchgear and Controlgear Assemblies IEC 439-1,BS 5486

Part 1

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LV Motor Starters IEC 947-4-1

Overload Relay IEC 947-1, IEC 947-4

IEC 292

LV Motor Circuit Breakers IEC 947-1, IEC 947-2

Low Voltage Fuses IEC 269, BS 88

Fuses for domestic and similar purpose IEC 241

Ammeters and Voltmeters IEC 51, BS 89/90

Power Capacitors IEC 831

Automatic Capacitor Bank IEC 439-1

LV Current Transformers IEC 185, BS 3938

LV Voltage Transformers IEC 186

30.2.5 Switch Boards

Main and sub-main panels, distribution boards and lighting panels/boards shall be made
in accordance with IEC 529 and BS 5420 standards. They can be used to build up
equipment complying to IEC 439-1 and BS 5486 part 1 standard. The cubicle shall be
totally enclosed, dust proof, vermin proof, floor/surface/flush mounting type. The cubicle
shall be fabricated with:

30.2.5.1Material

Prime quality mild sheet or galvanised sheet steel.

side members 2.5 mm thickness

top section 4.0 mm thickness
Cladding 1.5 mm thickness

Foundation steel section 100 x 50 x 6t mm

Bottom plates: 4mm thick steel sheet

30.2.5.2Finish

A. De-rusting and cleaning: By pickling

B. Anti-corrosive treatment : Phosphating
C. Outside and inside finish : Epoxy polyester resin
D. Colour As specified

All breakers shall be fixed on prefabricated appropriate plates or DIN rails. Access to
operating handle of incoming circuit breaker shall be provided through an appropriate
front cover, fixed to the door to the front panel.

One cubicle will house outgoing circuits of 2,000 Amperes, approximately. Normally,
four outgoing circuits can be housed in one cubicle. However, six outgoing circuits upto
160 Amps can be housed in one cubicle. Dropper bus bars shall be provided for outgoing

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upto the termination level at the bottom of the panel. Adequate cable fastening
arrangement shall be provided. The distribution boards shall have space for extension.

30.2.5.3Electrical Characteristics

rated voltage : 1000 V

rated insulation voltage : 1000 V
rated current : As specified on drawing/s.
rated short circuit withstand
current : kA/ 1s
rated peak withstand current : kA

Fused switch and load break switches acc. to IEC 947-3 / BS 5419 incorporating HRC
fuses acc. to IEC 269 and BS 88 shall be, heavy duty metal clad type complete with all
accessories. Motor starters to, IEC 947-4, / BS 947, shall comprise of push button,
magnetic contractor (AC 3 duty), with three element, compensated and differential, with
manual and automatic resetting over-load relay acc. to IEC 947-1, IEC 947-4, IEC 292
and component co-ordination shall be Type 2 acc. to IEC 947-4-1. The short circuit
ratings shall not be less than short circuit level shown on the schematic/BOQ.
Characteristics of all protective devices shall provide selective discrimination.

30.2.5.4Busbars System

The panel shall consist of vertical 3 phases and neutral, adequately rated, air insulated,
electrolytic copper (99.9%) purity bus bars and shall be suitably supported and braced to
withstand the symmetrical fault current specified. The cross section of neutral bus bar
shall be half of phase bar cross section or more. Each bolted joint shall be provided with a
locking device. Maximum temperature rise allowed is 40 C at 50 C ambient. Bus bars
having tin coating shall be preferred. Provide a full length ground bus in the rear of each
cubicle.

30.2.5.5Meter Indication Lights, Push Button etc.

Indication lights, push button shall be rated for 250V CT’s shall be of accuracy class 0.5
for tariff metering purpose and 1.5 for indication purpose. The Ampere Meter and Volt
Meter shall be suitable range and of size 96 x 96 mm. Current Transformer’s rated load
shall be adequate and must not saturate at over current of adequate capacity. Current
Transformers shall be provided for all outgoing circuits. Instrument and meters shall be
mounted not less than 1500mm and not more than 2000 mm above floor level.

30.2.6 Motor Control Centres

Motor Control Centres shall be combination of circuit breaker and starter type of size and
rating as shown on drawings and shall be designed, tested and assembled in accordance
with IEC 947-4 standards. The enclosure shall consist of standard modular cubicle bolted
and bussed together to form a rigid, structure having the following features in each
cubicle addition to constructional details specified for Switch Boards:

Top, bottom and lateral wiring in cable ducting

One vertical duct per vertical grouping of starters

Capability of addition of future cubicles by bolting on a new cubicle.

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Provision for addition of splice plates to the main bus

All doors shall be formed up on all sides and shall be equipped with captive screw
fasteners and hinges.

30.2.6.1Busbars System

It shall be of electrolytic copper with purity (99.9%) and to be sized as per design basis
specified above. Bracing shall be adequate for symmetrical fault current specified at 415
V. Bus bars shall be supported on high impact, non tracking material. A full length
ground bus shall be provided on the bottom of the cubicle. Horizontal busbars shall be
rated for amperes specified for each MCC. Busbars shall be sized to limit temperature
rise to 50 C above a 40 C ambient. Vertical busbars shall be rated for 1.5 times the rated
current.

30.2.7 Distribution Boards

The distribution boards shall comply to configuration as shown on drawings or as

detailed in schedule of quantities. The distribution board shall be flush surface type with,
moulded case circuit breaker and miniature circuit breaker as given in the schedule. The
cabinet shall be constructed of mild steel sheet. Neutral distribution shall be carried out
through neutral copper block with incoming and the required numbers of outgoing
conductors.

The housing shall be rust-proof finished with epoxy polyester resin or stove enamel paint
and shall have gasket fitting and detachable doors for easy wiring.

30.2.8 Circuit Protective Devices

Technical data and characteristics including discrimination and cascading charts, thermal
stress limitation curves and temperature de-rating chart/curve shall be made available as
required. The Contractor / supplier shall select circuit breakers to satisfy all requirements
of discrimination and adequate protection of all circuit elements.

Interrupting capacities of circuit breakers shall be in accordance to IEC 947-2, Ics and Icu
at 415 V unless specified otherwise.

30.2.8.1 Air Circuit Breaker

The Air Circuit Breaker shall comply with IEC 947-2, be suitable for isolation and shall
be fully tropicalised (T2). The circuit breakers shall be designed to be maintained easily.
The electrical endurance (CO at Un=690V) shall be equal to the mechanical endurance
and shall not be less than 10,000 cycles without maintenance. The operating mechanism
shall be of the stored energy spring type, with motor operator for spring charging where
required (it shall also be possible to charge the springs manually).

ACB contacts shall be maintenance free in normal usage and provided with a mechanical
wear indicator. All electrical auxiliaries shall be field adaptable without adjustment. The
current sensor shall be located within the case of the circuit breaker and wiring shall be
integrated. Sensors shall be air core type to ensure accurate measurement and highest
discrimination upto the circuit breaker electrodynamical withstand, even for the
instantaneous protection. The overload relay shall have a wide adjustment range. The trip
unit shall measure the true RMS value of any wave form of current. The over-current
protection shall be of solid state type, with the following characteristics:

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General Application:

Long time protection (LT):

adjustable from 40~100 of sensor rating

time delay adjustable from 15 to 480 seconds (at 1.5 times the long time setting)

Short time protection (ST):

adjustable from 0.4 to 15 times the sensor rating

time delay setting adjustable from instantaneous to 0.3 sec.

time inverse characteristics (I x T) may be switched in to improve discrimination

Instantaneous (INST.):

adjustable from 2 times the rated current upto the circuit breaker electrodynamical
withstand

adjustable from 1.6 to 10 times the setting made on the long time protection

time delay adjustable from instantaneous to 0.3 sec.

30.2.8.2 Moulded Case Circuit Breakers

Moulded case circuit breakers shall comply with IEC 947-2, be of the circuit breaker
disconnector type and shall be maintenance-free and fully tropicalised (T2). MCCB’s
designed for horizontal or vertical mounting and reverse feeding, without any adverse
effect on electrical performance. The operating mechanism shall be trip free type, quick-
make, quick-break design with all poles opening or closing simultaneously. The
operating toggle shall clearly indicate the ON, OFF and TRIP position. All electrical
auxiliaries (shunt trip, UV trip, auxiliary contacts, motor mechanism, etc.) shall be of
retrofit type and shall be field installable.

The trip unit shall be internally energised and shall have the following characteristics:

thermal overload and magnetic short circuit type

(adjustable, where required), or

solid state type, with

Long time protection (LT):

adjustable from 50% to 100% of the sensor rating

time delay adjustable from 15 to 480 seconds at 1.5 times the setting made for long delay.

Short time protection (ST):

adjustable from 1.5 to 10 times the sensor current rating.

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time delay adjustable from instantaneous to 0.225 seconds

Instantaneous (INST.):

adjusted from 2 to 15 times the nominal current rating.

Earth fault protection, where required:

adjustable from 0.2 to 0.5 times of long protection setting

30.2.8.3 Miniature Circuit Breakers

MCB’s (rated 1 to 100A) shall comply with IEC 898 (domestic use) or IEC 947-2
(industrial use) and suitable for DIN rail mounting, and shall be maintenance-free and
fully tropicalised (T2). They shall be designed for horizontal or vertical mounting, or
reverse feeding, without any adverse effect on its performance.

The operating mechanism shall be mechanically trip free from the operating handle so as
to prevent contacts from remaining hold closed against short circuit and overload
conditions. It shall be of the “automatic resetting type”. The operating toggle shall clearly
indicate the ON/OFF/TRIP positions.

Trip bar mechanism of each pole of a multi-pole MCB shall be joined together within
MCB casing and not only by operating handles. The operating handle shall be of the
toggle type with padlocking facility. MCB shall be rated for 20,000 mechanical operating
(O-C) and minimum operating electrical cycles:

20A : 20,000

25A : 15,000

32A : 10,000

Each pole shall be provided with bi-metallic thermal element for overload protection and
magnetic element for short circuit protection. Terminals shall be of tunnel type (IP20) in
order to minimise the risk of direct contact.

The tripping characteristics shall be:

Type 2/IEC 898 or Curve B or C/IEC 947-2

Curve MA/IEC 947-2 for motor starter protection

MCB’s having provision of auxiliaries like: shunt trip, under voltage release, status
switch, alarm or residual current devices (RCD’s) installation on site shall be preferred.

30.2.8.4 Earth Leakage Circuit Breakers (ELCB)

Earth leakage circuit breaker (ELCB), or residual current devices (RCD’s) according to
IEC 1008 and IEC 1009 shall be protected against nuisance tripping due to transient and
shall be sensitive to pulsating DC fault currents. All ELCB’s shall be provided with
backup protection adequate for the fault level at the point of installation.

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ELCB’s shall have an electrical life of at least 4000 operations, a mechanical life of at
least 20,000 operations and shall be equipped with a positive contact position indicator
and a “test” button.

30.2.8.5 Load Break Switches (LBS)

Load Break Switch, according to IEC 947-3, shall be of AC22 switching duty on general
lighting and power panels. Motor feeders and panels shall be equipped with AC31 duty
switches.

30.2.8.6 Circuit Breakers Combination Starters

The circuit breaker combination starter shall be as follows:

Full draw-out (plug in ) type (except load terminals) made in standard modular sizes so
that a starter from one motor centre can be moved to another motor control centre without
modification. It shall not be necessary to remove control wiring from terminal blocks to
withdraw the starter unit.

Circuit breakers in combination with the motor starters shall be of high interrupting
capacity type having a minimum interrupting ability of rms symmetrical current 15 kA at
415 V. Circuit breakers shall contain an auxiliary switch to disconnect control power
when breaker is turned OFF.

Overload relays shall be provided in each leg of the starter operation of “Reset” button
and will not cause the starter to drop out.

Each starter shall be wired for a control voltage of 220 volts.

Starter operating coils shall be pressure moulded-hermetically sealed so that they will not
bubble, melt or expand and so that they will not prohibit the starter from dropping out
upon coil failure.

Each starter shall be provided with a 220 volts, red running pilot light and a hand-off-
automatic or start-stop push button as required. Pilot lights will be operated by an
interlock contact on the starter placed across the operating coil. Lamps shall be long life,
Neon type.

In addition to the “holding interlock” and the pilot light interlock, each starter shall
contain two extra auxiliary interlocks. These interlocks will be capable of being
converted to normally open or normally closed in the field.

Each starter shall be provided with a black luminous name plate with 1/8” high white
letters engraved to identify load served.

30.2.8.7 Disconnect Switches

The disconnect switches shall be iron clad with or without fuse, as specified. The
switches shall be heavy duty, double isolation, quick make, quick break type and
provided with padlocking arrangement. Disconnect switches shall be provided at each
motor that is out of sight. The fuses where required shall comply to IEC 269-1/BS 88
standards.

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30.2.9 LV Bus Duct Specification

The bus duct shall be 3 phase, 4 wire indoor type and shall have rectangular section
electrolytic copper bus bar suitable for continuous current rating of 3,200 Amps enclosed
in sheet steel housing bus bar shall be bare copper. All bolted connections shall have
locking washers and shall be braced and supported to withstand short circuit of 150 kA
and shall have basic impulse level of 2 kV. Maximum temperature reise allowed is 40 C
at 50 C ambient.

The bus duct’s housing shall be of 2 mm thick sheet steel. The sheet steel shall be de-
rusted, degreased and painted with heat resistant paint over an anti-corrosive base. A
continuous earth bar of at least 150 sq. mm copper shall be provided on both sides along
the bus duct length.

The bus duct’s end at Main Distribution Panel shall be co-ordinated with LT Distribution
Panel and step down transformer as per site conditions. The bus bars shall be terminated
with flexible copper connected at one end.

The bus duct shall be provided with all supporting steel hardware etc., for hanging the
bus duct from RCC ceiling/beam. All organic material shall be suitable for a tropical
atmosphere.

30.2.10 Wiring

All power wiring and operating control wiring shall run in conduits. All wiring conduits
shall be PVC in concealed spaces and G.I. pipe, if exposed to vision. The make of cables
shall be Pakistan Cables or approved equal. Material and application specifications for
wiring accessories shall be subject to Engineer’s approval.

30.2.11 Earthing

30.2.11.1General

For scope of work refer to clauses 21.1 and 21.3 All HVAC equipment with electricity
connection and all MCCs, ACPs and LISs panels shall have their frames, carcasses and
all metal parts not normally carrying current, effectively and continually connected to
the general mass of the earth. Each piece of equipment and panel shall be separately
connected to a main earth continuity conductor.

30.2.11.2 Earth Continuity Conductor

The earth continuity conductor shall be round, hard drawn, bare electrolytic copper wire
of appropriate sizes, as approved by the Engineer. All fixing accessories, earthing clips,
sweating sockets, lugs, thimbles, etc., shall be provided with a complete earthing
installation.

30.2.12 Conduits and Conduit Accessories

30.2.12.1 Material Description

The conduit for wiring shall be of polyvinyl-chloride material for use in concealed
locations and G.I. pipe in exposed locations. All other accessories shall be subject to the
Engineer’s Approval.

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30.2.12.2 Application of PVC Conduit

Manufactured smooth bends shall be used where the conduit changes direction. Bending
of the conduit by heating or otherwise shall be allowed at special situations only, for
which approval of the Engineer shall be required. The use of sharp 90 degree bends and
tees shall not be allowed. The bends shall have enlarged ends to receive the conduit
without any reduction in the internal diameter at the joint. Round Junction Boxes shall be
provided with one piece PVC cover plate which shall be installed on the box by means of
galvanized screws. Pull

Boxes should be installed in conduit runs to limit the pulling lengths as required. The
rectangular inspection or pull boxes shall be 16 S.W.G. thick sheet steel having nipples to
receive PVC conduit with force fit. The sheet steel box shall be painted inside and
outside with black enamel paint over a base coat of red oxide antitrust paint, as approved
by the Engineer The minimum length of inspection box shall not be less than four times
the cables manufacturer’s recommended bending radius of the cable. Bushes shall be
used at pipe termination and PVC solution for joining of pipes.

30.2.12.3 Application of GI Conduit

Application of GI conduit shall be similar to PVC conduit as specified above, except that
pipes shall have threaded socket connections. Pipes and fittings shall be as specified in
Piping Section, finished with 2 coats of aluminum paint.

30.2.13 Inspection and Test

All equipment shall be subject to inspection and the following witness tests at supplier’s
works:

A. Inspection of compliance with specification

B. Over-voltage and insulation

C. Operational tests on all protective devices

D. Operational tests on all control circuits/system

E. Checking of calibration and range of all devices

These electric panels shall also be inspected during various fabrication stages. One week
prior notice shall be given by the supplier for final inspection.

30.2.14 Drawings and Documentation

Two copies of dimensioned general arrangement drawings shall be submitted with the
quotation. Three copies of general arrangement drawings and circuit diagrams shall be
supplied for approval before commencing manufacture.

Subsequently, three copies of approved and as built general arrangement drawings,

circuit diagrams and wiring diagrams complete with component/material lists.
Manuals/technical literature, specification of components, characteristics curves of circuit
breaker overloading and tripping devices, etc., of all components shall also be supplied.

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30.2.15 Packing and Delivery

The equipment shall be suitably protected for indoor storage and for transport and
delivery to site. The electric Panel shall be delivered in safe and sound condition, free
from all defects.

31- TEMPERATURE & AUTO CONTROL SYSTEM

31.1 GENERAL PROVISION

The Contractor shall provide DDC (Direct Digital Control) based temperature and auto
controls for all Air Handling Units (AHUs). Each AHU shall be provided with a separate
complete control package, which shall include but not limited to the microprocessor
panel, sensors, transmitters, control transformers, conduiting/wiring etc. as detailed in the
respective Control Schematic Diagram given in drawings to make the system fully
functional as per Employer/Engineer’s satisfaction.

31.2 STANDALONE DDC PANELS

31.2.1 General:

Standalone DDC panels shall be microprocessor based, multi-tasking, multi-user, real-

time digital control processors with crystal display for field setting. Each standalone
DDC panel shall consist of modular hardware with plug-in enclosed processors,
communication controllers, power supplies, and input/output modules. A sufficient
number of controllers shall be supplied to fully meet the requirements of this
specification and the attached point list.

31.2.2 Memory:

Each DDC panel shall have sufficient memory to support its own operating system and
databases including:

- Control processes
- Energy Management Applications
- Alarm Management
- Historical/Trend Data for all points
- Maintenance Support Applications
- Custom Processes
- Operator I/O
- Dial-Up Communications
- Manual Override Monitoring

31.2.3 Point types:

Each DDC panel shall support the following types of point inputs and outputs:

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-Digital Inputs for status/alarm contacts

-Digital Outputs for on/off equipment control
-Analog Inputs for temperature, pressure, humidity, flow, and position measurements

-Analog Outputs for valve and damper position control, and capacity control of primary
equipment
-Pulse Inputs for pulsed contact monitoring

31.2.4 Expandability:

The system shall be modular in nature, and shall permit easy expansion through the
addition of software applications, workstation hardware, field controllers, sensors, and
actuators.

The system architecture shall support 20% expansion capacity of all types of DDC
panels, and all point types included in the initial installation.

31.2.5 Serial Communication Ports:

Standalone DDC panels shall provide at least two RS-485C serial data communication
ports for simultaneous operation of multiple operator I/O devices such as industry
standard printers, laptop workstations, PC workstations, and panel mounted or portable
DDC panel Operator's Terminals. Standalone DDC panels shall allow temporary use of
portable devices without interrupting the normal operation of permanently connected
modems, printers, or network terminals.

31.2.6 Hardware Override Switches:

As indicated in the point schedule, the operator shall have the ability to manually
override automatic or centrally executed commands at the DDC panel via local, point
discrete, onboard hand/off/auto operator override switches for binary control points and
gradual switches for analog control type points. These override switches shall be operable
whether the panel is powered or not.

31.2.7 Hardware Override Monitoring:

DDC panels shall monitor the status or position of all overrides, and include this
information in logs and summaries to inform the operator that automatic control has been
inhibited. DDC panels shall also collect override activity information for daily and
monthly reports.

31.2.8 Local Status Indicator Lamps:

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The DDC panel shall provide local status indication for each binary input and output for
constant, up-to-date verification of all point conditions without the need for an operator
I/O device.

31.2.9 Integrated On-Line Diagnostics:

Each DDC panel shall continuously perform self-diagnostics, communication diagnosis

and diagnosis of all subsidiary equipment. The DDC panel shall provide both local and
remote annunciation of any detected component failures, or repeated failure to establish
communication. Indication of the diagnostic results shall be provided at each DDC
panel, and shall not require the connection of an operator I/O device.

31.2.10 Surge and Transient Protection:

Isolation shall be provided at all network terminations, as well as all field point
terminations to suppress induced voltage transients consistent with IEEE Standard 587-
1980. Isolation levels shall be sufficiently high as to allow all signal wiring to be run in
the same conduit as high voltage wiring where acceptable by electrical code.

31.2.11 Power Fail Restart:

In the event of the loss of normal power, there shall be an orderly shutdown of all
standalone DDC panels to prevent the loss of database or operating system software.
Non-Volatile memory shall be incorporated for all critical controller configuration data,
and battery back-up shall be provided to support the real-time clock and all volatile
memory for a minimum of 72 hours.

Upon restoration of normal power, the DDC panel shall automatically resume full
operation without manual intervention.

Should DDC panel memory be lost for any reason, the user shall have the capability of
reloading the DDC panel via the local area network, via the local RS-485C port.

31.3 SYSTEM SOFTWARE FEATURES

31.3.1 General

1. All necessary software to form a complete operating system as described in this

specification shall be provided.

2. The software programs specified in this section shall be provided as an integral part
of the DDC panel and shall not be dependent upon any higher level computer for
execution.

31.3.2 Control Software Description:

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1. Pre-Tested Control Algorithms:

The DDC panels shall have the ability to perform the following pre-tested control
algorithms:

a. Two Position Control

b. Proportional Control
c. Proportional plus Integral Control
d. Proportional, Integral, plus Derivative Control
e. Automatic Control Loop Tuning

2. Equipment Cycling Protection:

Control software shall include a provision for limiting the number of times each piece
of equipment may be cycled within any one-hour period.

3. Heavy Equipment Delays:

The system shall provide protection against excessive demand situations during start-
up periods by automatically introducing time delays between successive start
commands to heavy electrical loads.

4. Powerfail Motor Restart:

Upon the resumption of normal power, the DDC panel shall analyze the status of all
controlled equipment, compare it with normal occupancy scheduling, and turn
equipment on or off as necessary to resume normal operation.

31.3.3 Energy Management Applications:

DDC Panels shall have the ability to perform any or all of the following energy
management routines:

- Time of Day Scheduling

- Calendar Based Scheduling
- Holiday Scheduling
- Temporary Schedule Overrides
- Optimal Start
- Optimal Stop
- Night Setback Control
- Enthalpy Switchover (Economizer)
- Peak Demand Limiting
- Temperature Compensated Load Rolling
- Fan Speed/CFM Control
- Heating/Cooling Interlock
- Cold Deck Reset

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- Hot Deck Reset
- Hot Water Reset
- Chilled Water Reset
- Condenser Water Reset
- Chiller Sequencing

All programs shall be executed automatically without the need for operator
intervention, and shall be flexible enough to allow user customization. Programs
shall be applied to building equipment as described in the Execution portion of this
specification.

31.3.4 Custom Process Programming Capability:

DDC panels shall be able to execute custom, job-specific processes defined by the
user, to automatically perform calculations and special control routines.

1. Process Inputs and Variables:

It shall be possible to use any of the following in a custom process:

- Any system-measured point data or status
- Any calculated data
- Any results from other processes
- User-Defined Constants
- Arithmetic functions (+,-,*,/, square root, exp, etc.)
- Boolean logic operators (and, or, exclusive or, etc.)
- On-delay/Off-delay/One-shot timers

2. Process Triggers:

Custom processes may be triggered based on any combination of the following::

- Time interval
- Time of day
- Date
- Other processes
- Time programming
- Events (e.g., point alarms)

3. Dynamic Data Access:

A single process shall be able to incorporate measured or calculated data from any
and all other DDC panels on the local area network.

In addition, a single process shall be able to issue commands to points in any and all
other DDC panels on the local area network.

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4. Advisory/Message Generation:

Processes shall be able to generate operator messages and advisories to operator I/O
devices. A process shall be able to directly send a message to a specified device,
buffer the information in a follow-up file, or cause the execution of a dial-up
connection to a remote device such as a printer or pager.

5. Custom Process Documentation:

The custom control programming feature shall be self-documenting. All

interrelationships defined by this feature shall be documented via graphical
flowcharts and English language descriptors.

31.3.5 Alarm Management:

Alarm management shall be provided to monitor, buffer, and direct alarm reports to
operator devices and memory files. Each DDC panel shall perform distributed,
independent alarm analysis and filtering to minimize operator interruptions due to
non-critical alarms, minimize network traffic, and prevent alarms from being lost. At
no time shall the DDC panel's ability to report alarms be affected by either operator
activity at a PC Workstation or local I/O device, or communications with other panels
on the network.

1. Point Change Report Description:

All alarm or point change reports shall include the point's English language
escription, and the time and date of occurrence.

2. Prioritization:

The user shall be able to define the specific system reaction for each point. Alarms
shall be prioritized to minimize nuisance reporting and to speed operator response to
critical alarms. A minimum of three priority levels shall be provided. Each DDC
panel shall automatically inhibit the reporting of selected alarms during system
shutdown and start-up. Users shall have the ability to manually inhibit alarm
reporting for each point.

The user shall also be able to define under which conditions point changes need to be
acknowledged by an operator, and/or sent to follow-up files for retrieval and analysis
at a later date.

3. Report Routing:

Alarm reports, messages, and files will be directed to a user defined list of operator
devices, or PCs used for archiving alarm information. Alarms shall also be
automatically directed to a default device in the event a primary device is found to be
off-line.

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4. Alarm Messages:

In addition to the point's descriptor and the time and date, the user shall be able to
print, display or store a 65-character alarm message to more fully describe the alarm
condition or direct operator response.

Each standalone DDC panel shall be capable of storing a library of at least 250 Alarm
Messages. Each message may be assignable to any number of points in the panel.

5. Auto-Dial Alarm Management:

In Dial-up applications, only critical alarms shall initiate a call to a remote operator
device. In all other cases, call activity shall be minimized by time-stamping and
saving reports until an operator scheduled time, a manual request, or until the buffer
space is full. The alarm buffer must store a minimum of 50 alarms.

31.3.6 Historical Data and Trend Analysis:

A variety of Historical data collection utilities shall be provided to automatically

sample, store, and display system data in all of the following ways.

1. Continuous Point Histories:

Standalone DDC panels shall store Point History Files for all analog and binary
inputs and outputs.

The Point History routine shall continuously and automatically sample the value of all
analog inputs at half hour intervals. Samples for all points shall be stored for the past
24 hours to allow the user to immediately analyze equipment performance and all
problem-related events for the past day. Point History Files for binary input or output
points and analog output points shall include a continuous record of the last ten status
changes or commands for each point.

2. Control Loop Performance Trends:

Standalone DDC panels shall also provide high resolution sampling capability with
an operator-adjustable resolution of 10-300 seconds in one-second increments for
verification of control loop performance.

3. Extended Sample Period Trends:

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Measured and calculated analog and binary data shall also be assignable to user-
defineable trends for the purpose of collecting operator-specified performance data
over extended periods of time. Sample intervals of 1 minute to 2 hours, in one-minute
intervals, shall be provided. Each standalone DDC panel shall have a dedicated buffer
for trend data, and shall be capable of storing a minimum of 5000 data samples.

4. Data Storage and Archiving:

Trend data shall be stored at the Standalone DDC panels, and uploaded to hard disk
storage when archival is desired. Uploads shall occur based upon either user-defined
interval, manual command, or when the trend buffers become full. All trend data
shall be available in disk file form for use in 3rd Party personal computer
applications.

31.3.7 Runtime Totalization:

Standalone DDC panels shall automatically accumulate and store runtime hours for
binary input and output points as specified in the Execution portion of this
specification.

1. The Totalization routine shall have a sampling resolution of one minute or less.

2. The user shall have the ability to define a warning limit for Runtime Totalization.
Unique, user-specified messages shall be generated when the limit is reached.

31.3.8 Analog/Pulse Totalization:

Standalone DDC panels shall automatically sample, calculate and store consumption
totals on a daily, weekly, or monthly basis for user-selected analog and binary pulse
input-type points.

1. Totalization shall provide calculation and storage of accumulations of up to 99,999.9

units (e.g. KWH, gallons, KBTU, tons. etc.).

2. The Totalization routine shall have a sampling resolution of one minute or less.

3. The user shall have the ability to define a warning limit. Unique, user-specified
messages shall be generated when the limit is reached.

31.3.9 Event Totalization:

Standalone DDC panels shall have the ability to count events such as the number of
times a pump or fan system is cycled on and off. Event totalization shall be
performed on a daily, weekly, or monthly basis.

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1. The Event Totalization feature shall be able to store the records associated with a
minimum of 9,999,999 events before reset.

2. The user shall have the ability to define a warning limit. Unique, user-specified
messages shall be generated when the limit is reached.

31.4 STANDALONE DDC PANEL LOCAL OR PORTABLE OPERATOR'S

TERMINALS:

Each DDC panel shall be capable of supporting an operator's terminal for local
command entry, instantaneous and historical data display, and program additions and
modifications.

1. There shall be a provision for both permanently mounting the standalone DDC panel
Oerator Terminal, or using it as a portable handheld unit.

2. The DDC panel Operator Terminal shall simultaneously display a minimum of 6

points with full English identification to allow an operator to view single screen
dynamic displays depicting entire mechanical systems.

3. The operator functions provided by the DDC panel Operator Terminal shall include,
but not be limited to, the following:

- Start and Stop Points.

- Modify Setpoints.
- Modify PID Loop Setpoints.
- Override PID Control.
- Change Time/Date.
- Add/Modify Start/Stop Weekly Scheduling.
- Add/Modify Setpoint Weekly Scheduling.
- Enter Temporary Override Schedules.
- Define Holiday Schedules.
- View Analog Limits.
- Enter/Modify Analog Warning Limits.
- Enter/Modify Analog Alarm Limits.
- Enter/Modify Analog Differentials.
- View Point History Files.

4. The DDC panel Operator Terminal shall provide access to all real or calculated
points in the controller to which it is connected, or any other controller in the
network. This capability shall not be restricted to a subset of predefined "global
points", but shall provide totally open exchange of data between the operator terminal
and any DDC panel in the network.

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5. Operator access at all DDC panel Operator Terminals shall be identical to each other,
as well as identical to the PC or Laptop Operator Workstations. Any password
changes shall automatically be downloaded to all controllers on the network.

6. The DDC panel operator terminal shall provide English language prompting to
eliminate the need for the user to remember command formats or point names.
Prompting shall be provided consistent with a user's password clearance and the types
of points being displayed, to eliminate the possibility of operator error.

7. A multi-function touch pad shall be provided for point and command selection, as
well as parameter entry. To minimize the possibility of operator error, the DDC panel
Operator Terminal shall change and limit touch pad functions based upon an
operator's password clearance, the function being performed, and types of points
being displayed. Screen displays shall clearly indicate only valid touch pad functions.

8. Context-Sensitive Help: On-line, interactive user's "Help" manuals and tutorials shall
be provided. Based upon operator request, the "help" function shall provide general
system operating instructions, and specific descriptions of commands available in the
currently displayed menus.

9. Identification for all real or calculated points shall be consistent for all network
devices. The same English language names used at PC workstations shall be used to
access points at the DDC panel Operator's Terminal to eliminate cross-reference or
look-up tables.

10. In addition to instantaneous summaries, the DDC panel Operator's Terminal shall
allow a user to view a Point History file for system points. Point History files shall
provide a record of value of analog points over the last 24 hours, at 30-minute
intervals, or a record of the last ten status changes for binary type points.

31.5 SEQUENCE OF OPERATION

31.5.1 Air Handling Units

1. The extended microprocessor controller shall be 100% standalone and having a

display and programming keypad.
2. The air-handling unit fans, both supply & return where scheduled, shall be provided
with starter panel with H/O/A Switch. With switch on Auto position, the fan shall be
switched On/Off Through On/Off Switch on Control Panel.
3. A differential pressure switch across supply and return fans shall monitor airflow, in
case of airflow failure the fan is switched off and cooling valve shall be closed and
humidifier shall be also off.
4. When smoke detector in return air duct shall activate the AHU fan will de-energize
and valve and humidifier shall also off

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5. A pressure differential switch across filters shall monitor the pressure drop across
filter. When pressure drop across the filter shall increase from set point the alarm
shall be annunciated on controller as well as host terminal.
6. In summer the space temperature shall be maintain constant at user defined set-point,
by sensing space temperature and modulating chilled water control valve through
Extended microprocessor based digital controller.
7. In summer if space humidity shall be increase from the set-point the chilled water
Coil shall operate for de-humidification and temperature shall be maintain by re-heat
electric coil by microprocessor based digital controller.
8. In winter the space temperature shall be maintain constant at user defined set-point,
by sensing space temperature and operating combination heating/cooling coil through
extended microprocessor based controller.
9. Supply air temperature shall act as low limit summer and act as fire-stat (High Limit)
in winter.
10.All inputs, outputs, set points and time schedule shall be changed from controller.
11.Following engineering data shall be displayed, on Controller

 Supply air temperature indication and limit alarm.

 Return air temperature indication and limit alarm.
 Return air humidity indication and limit alarm.
 Supply duct pressure indication and limit alarm.
 Fans status indication and failure.
 Temperature set point.
 Chilled water control valve position
 Filters Position.
 Smoke Detector Status.

32- PAINTING

32.1 The Contractor shall paint all hangers, mounting frames and other related metal surfaces
exposed to air, as specified and he shall also be responsible for all finish painting. The
minimum number of coats are specified hereinunder but sufficient coats shall be given to
achieve desired finish.

32.2 The material for painting shall be high-grade products of a well-known manufacturer
when approved, shall be delivered on the site in original unbroken packages bearing the
maker’s name and brand. Paints of approved color only shall be used for each
application.

32.4 All surfaces shall be clean, dry and free from dust at the time any coating is applied.

32.4 Interior painting shall not be done when temperature is below 30 deg. F. Enamel shall not
be applied when temperature is below 70 deg. F. Exterior painting shall not be done in
frosty, foggy or damp weather, or when the temperature is below 50 deg. F.

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32.5 All plant, equipment, pumps and motors shall be provided with three coats of enamel
paint in the factory and shall be carefully cleaned and oiled after installation. In the case
of the original paint having been damaged, fresh coats of enamel paint to match the
original shall be given.

32.6 All steel pipe work, duct bracing angles or other steel equipment specified to be
insulated, shall be thoroughly wire-brushed and have one coat of black asphaltum paint
before insulation is applied. Boiler breaching and kitchen range hood ducts shall be
painted with heat resistant paint.

32.7 All pipe and duct hangers and duct angle bracing, which are located in concealed spaces,
shall be given a heavy coat of aluminum paint before being concealed.

32.8 The interior of all duct and outlet boxes at the back of air grilles, registers and diffusers
shall be painted with two coats of dull black paint.

32.9 All black steel ducting, piping and other equipment required to be insulated, shall be
thoroughly wire-brushed and applied with one coat of black asphaltum paint before
insulation is fixed.

32.10 The interior of masonry built up fresh air and fan chambers shall have two coats of
odourless non-scaling paint applied.

32.11 All 8 oz. weight canvas jacketed insulated ducting and piping, in plant rooms or visible in
the occupied areas, shall be given one coat of polyvinyl 1 acetate with water repellent
emulsion and finished with two coats of synthetic enamel paint.

32.12 Paint shall be applied as per manufacturer’s printed application directions. Paint color
scheme shall be specified at the time of painting or earlier.

32.13 The ducting and piping shall be painted according to the color code based on American
standard “Scheme for identification of piping systems” and used for finish painting. All
color codes on the scheme shall be approved by the Engineer.

32.14 The Contractor shall stencil, near each valve on the pipe, the name of the fluid. Also, an
arrow should be painted next to the legend, indicating the direction of flow in pipe.

32.15 The Contractor shall further provide manufacturer’s application directions, performance
guarantee and literature.

33- CLEANING AND TESTING

33.1 The Contractor shall, during construction, properly cap pipes and ducts to prevent the
entrance of dirt, etc. Each ducting and piping circuit shall be blown through, after
completion, for as long a time as is necessary to thoroughly clean that circuit.

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33.2 All air ducting sections shall be given a pressure test before fixing insulation and cutting
openings for branches and air devices. Any opening made shall be sealed off with airtight
metal caps, balloons or any other convenient device for allowing the pressure test. The
ducts shall be pressurized with a rotary blower or nitrogen cylinder.

(a) Low pressure ducts upto 2” wg.

(b) Medium pressure ducts upto 6” wg, and
(c) High pressure ducts upto 8” 0 wg.

All seams and joints shall be checked and all audible and noticeable leaks repaired in a
good workman-like manner, by filling with an approved sealant to the inside of the joint,
so that the air pressure tends to force the sealant into the joint. A cfm leakage upto 10%
of the volume of the duct section under test shall be permissible.

In case the Consultant directs the Contractor to carry out final measured leakage test for
medium or high-pressure ducting, he will follow SMACNA procedure for leak testing.

33.3 All water piping shall be tested with a hydraulic pressure of 1-1/2 times the operating
pressure, but not less than 150 psig or at a pressure approved by the
Employer/Consultant, for sufficient time to detect leaks and defects. All leaks and defects
shall be made good in a proper workmanlike approved manner. If necessary piping shall
be taken down and re-erected, and any make-shift or temporary repair of leaks will not be
permitted.

33.4 The Contractor shall test all electric motors, electric wiring and earthing and furnish test
records to the Employer/Consultant.

33.5 After the entire installation has been completed, the Contractor shall commission the
equipment, making all necessary adjustments to the equipment, plant, balancing valves,
air dampers, air devices, etc., as called for and submit reports of performance tests as
specified elsewhere in this specification.

34- COMMISSIONING AND PERFORMANCE TESTS

34.1 The HVAC system described in this specification and shown on the drawings shall be
commissioned. A program for the commissioning and any specified tests shall be
prepared and this shall be incorporated in the contract program following approval by the
Employer/Consultant.

34.2 Commissioning shall mean, the advancement of all the building services system, from the
state of static completion to full working order, adjusted to the design requirements,
which are given.

34.3 The cost of providing all instruments and associated equipment whether of a temporary
and/or permanent nature, attendance of any specialists, and for the provision of test points

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required for the commissioning and testing, shall be included in the tender. A recent
calibration certificate for each instrument shall be available for inspection.

34.4 After Commissioning the Contractor shall execute the Test Run Operation of the system
for one year (daily 12 hours approx.) and hand over to the Company representative after
submittal of test data. The maintenance period for the HVAC system shall be of one
season each for heating and cooling.

34.5 The supplier shall provide warranty of all equipment and other works against defective
workmanship, faulty design and performance deterioration. The supplier should comply
with all the details of warranty / performance guarantee as mentioned in the forms in the
tender inquiry.

34.5 The Contractor shall provide OEM’s original technical literature specifying the following
information enclosed with their quotations.

 Make, model and origin of chiller, burner, cooling tower and related components /
controls of the system.
 Technical characteristics / capacity of system components under the specified
condition of operation.
 Gas and water flow rates and capacities.
 Electrical data, number and size of electric motors.

35- TEST RUN OF HVAC PLANT

The contractor shall be required to carry out a test run as specified in the tender / BOQ.
The test run observation shall be recorded in duplicate by the Contractor and approved by
the Employer/Engineer. The Contractor shall arrange experienced Engineer and sufficient
skilled labour for taking all the recordings of test run observations. The normal plant
operation shall be carried out in presence of the Employer/Engineer or his representative
at site.

The Employer shall only provide without charge to the Contractor Gas, water, electricity
for the test run (s) and the contractor shall be responsible for the supply of all tools and
instruments and labour / staff, etc., required to take and record the test run observations.

The test data sheets shall be jointly signed by the representative of the
Employer/Engineer and Contractor’s Engineer. The contractor shall hand over one set of
log sheets to the Company’s representative every day.

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