A. 5.
8 Inverter Precision AC Units
A.1. DIRECT EXPANSION (Inverter) PRECISION PACKAGED UNITS
Scope
The scope of work comprises of supply, installation, testing and commissioning of self contained BLDC Inverter
Scroll Precision air conditioning units suitable for operation on DX Mode. The unit should have advanced
microprocessor to the below specifications and in accordance with the Schedule of Quantities. The OEM Company
should have ISO 9001: 2015 certified manufacturing unit.
Climaveneta Comments: Complied
General
Modular construction Precision air conditioning unit suitable for operation in DX mode with R410A refrigerant with
Top/ bottom discharge arrangement (as per BoQ) consisting of inlet filter, Draw through direct drive Electronically
commutated Motors and Backward curved Plug fans, fan motor assembly to deliver desired air quantity, BLDC
Inverter Scroll Compressor(s), Direct Expansion Cooling Coil, Electronic Expansion Valve, Heater banks to maintain
humidity inside the space, condensate drain pan of Stainless Steel construction, Microprocessor panel, programmable
control complete with display for control and monitoring of the Unit functions. The unit should be suitable for
operation on 415 V, 50 Hz, AC supply.
Climaveneta Comments: Complied
Unit Base & Casing
Base panel shall be constructed out of sandwich panels of galvanized steel and painted with epoxy powder. All four
side panels (including front door) shall be double skinned sandwiched panels. The panels shall be insulated on the
inside with minimum 30 Kg/ cum glass wool, for fire insulation class A1. Unit shall be complete with space for
refrigeration equipment, fans, cooling coils, liquid receiver and multistage strip heaters and modulating Humidifiers.
Unit shall be provided with welded tubular steel floor stand with adjustable legs and requisite vibration isolation pads.
Climaveneta Comments: Complied
Fan
The units should be equipped with direct driven backward curved EC radial fans with electronically commutated
brushless motors; the technology employed by these motors allows straightforward control of fan speed by means of
the electronic controller in order to obtain step less adjustment of air flow rate and static pressure to ensure correct
distribution of the treated air. The motor’s high efficiency should make for less energy absorption, especially at partial
loads and during starting (lowering of peak current), which means a reduction in power consumption of
approximately 30% compared to AC motor. The motor shall have minimum IP54 Protection.
Climaveneta Comments: Complied
CLIMAVENETA CLIMATE TECHNOLOGIES (P) LTD.
# 415, 4th Floor, Qutab Plaza
DLF Phase-1, Gurugram
Haryana-122001
Tel: +91-124-6468951/52/53, Fax: +91-124-4000390
E-mail: sales@climaveneta.in
Filters
The filter chamber shall be an integral part of the system and withdraw able from the front of the unit. Filtration shall
be provided by deep V form class ISO ePM10 50% (under ISO 16890-3, corresponding to M5 EN779). The filtering
material (synthetic fibre) is optimised to guarantee the required filtration class and, at the same time, to minimize the
head losses on the air side.
Climaveneta Comments: Complied
Evaporator Coil
Precision packaged unit shall comprise of cooling coil of copper tubes expanded into aluminum fins with corrugated
profile and hydrophilic treatment. Face and surface areas shall be such as to assure rated capacity and the air velocity
across the coil and Filter shall not exceed 2.75 m/s. The cooling coil shall be minimum of 3 rows deep and the fin
spacing shall not exceed 1.8 mm. Coil selection to be suitable for SHF≥0.94 and provided with hydrophilic coating to
minimize / eliminate water carry over into the airflow stream. Drain pan shall be made of stainless steel.
Climaveneta Comments: Complied
Compressor
The compressor shall be of the high efficiency scroll design operating with R410A refrigerant and 400V/3~/50 Hz
supply.
There shall be single or double independent Refrigerant Circuits in the unit. Minimum one compressor should be
scroll with inverter controlled brushless DC motor, operating with R410A and power supply of 400-460V/3ph/50-
60Hz. The compressor should have integrated thermal overload protection and acoustic hood. The compressor
motor control driver is provided with integral electronic protection against over temperature, over current, over or
under-voltage with absence of one or more phases. The electronic control of the inverter is provided with automatic
soft-start system and continuous control of the compressor curve to prevent and correct its use beyond the maximum
allowed limits.
Crankcase Heater on Compressor should be integral part of the unit.
Compressors, the humidifier shall be isolated from the air flow in the version with downward flow, and in the air
flow in versions with upward output. The compressor shall be charged with synthetic oil and designed for operation
on environment friendly refrigerant R410A.
Climaveneta Comments: Complied
Refrigeration Circuit
The refrigeration system shall be of the single direct expansion type and incorporate hermetic scroll compressors,
complete with crankcase heaters.
The refrigerant circuit comprises:
• Liquid receiver
• Delivery oil separator
• Electronic expansion valve
• Solenoid valve for shutting off the refrigerant liquid
CLIMAVENETA CLIMATE TECHNOLOGIES (P) LTD.
# 415, 4th Floor, Qutab Plaza
DLF Phase-1, Gurugram
Haryana-122001
Tel: +91-124-6468951/52/53, Fax: +91-124-4000390
E-mail: sales@climaveneta.in
• Refrigerant liquid flow indicator
• Solid cartridge freon filter
• Safety valve
• High pressure safety pressure switch with manual reset
• Low pressure switch with automatic reset
• Shut-off valves for external connections (versions with remote condenser)
• Copper refrigerant pipes with anti-condensation insulation on the suction line
• Pipe taps on suction and delivery side and charging valve on liquid side.
• Each Compressor to have its own independent Evaporator and Condenser.
Expansion device: Electronic Expansion Valve (EEV)
• The unit should have Electronic Expansion Valve, which offers the following advantages:
• Fast, high precision adjustment of refrigerant flow;
• Fast arrival of the unit at steady-state conditions;
• Superheating value remains constant in variable thermal load conditions;
• Efficient operating conditions of the compressor, especially in the presence of low room temperatures;
• Wide working range with consequent extension of the unit’s operating limits. These properties result in enhanced
performance of the unit and make it possible to obtain very significant energy savings
• The Pressure transducers attached to the EEV shall be able to display real time pressure (Suction & Discharge) and
Superheat on the Microprocessor panel.
• The Temperature Sensor attached to the EEV shall be able to display real time parameters of Refrigerant such as
Suction & Discharge Temperature
Climaveneta Comments: Complied
Air Cooled Condenser
Condenser shall be air-cooled type, suitable for outdoor installation and shall be suitable for operating at high ambient
of 45 deg C DBT and at low ambient of upto 0 deg C DBT temperatures. Condenser shall be in copper tube &
aluminum fins construction and shall be factor coated with anti-corrosive coating against corrosive environment.
Condenser coil shall be of maximum 4 rows deep and the fin spacing shall not exceed 2mm.
The condenser fan/s shall be of propeller type with max 1310 RPM variable voltage electric motor complete with IP-
54 protection. Motor shall be speed controlled to ensure a stable operation for varying ambient; by a factory fitted
direct/indirect acting head pressure activated step-less Fan Speed Controller or using Electronically Commutated
Fan. The condenser shall be complete with provisions for refrigerant piping connections, shut off valves and any other
standard accessories necessary with the equipment supplied. Each Circuit to have its independent set of condenser
coil and Fans is separate casing.
Climaveneta Comments: Complied
Electric Strip heaters
Each packaged unit shall be provided with multistage electric heaters (2 Stage) with heating elements constructed
from a non- oxidable material. Electric strip heaters shall be of the low temperature totally enclosed strip type fitted
CLIMAVENETA CLIMATE TECHNOLOGIES (P) LTD.
# 415, 4th Floor, Qutab Plaza
DLF Phase-1, Gurugram
Haryana-122001
Tel: +91-124-6468951/52/53, Fax: +91-124-4000390
E-mail: sales@climaveneta.in
with radiation fins and suitable for operating at black heat. If overheating occurs, a safety thermostat should cuts off
the voltage supply to the heaters and triggers an alarm.
Climaveneta Comments: Complied
Humidifier
Boiling water in a polypropylene steam generator shall provide humidification. The humidifier shall be capable of
providing continuous auto modulation in steam generation from 30-100% as per the steam requirement per hour.
The humidifier shall be fully serviceable with replaceable electrodes. Waste water shall be flushed from the
humidifier by initiation of water supply valve via U-trap. The microprocessor should be able to display the current
drawn and actual steam output in the microprocessor.
Climaveneta Comments: Complied
De-Humidification
De-humidification cycle shall operate by reducing the speed of EC fan to reduce ADP of coil. Hence, by reduction of
fan speed there shall be additional power saving.
Climaveneta Comments: Complied
Water Sensor:
The system shall be provided with relevant water detection kit which shall have sensors. Each of the sensor must be
capable to detect individually any water below the false floor near the unit, the sensor
must be connected to the unit microprocessor thus enabling the controller to give an alarm incase of wet floor.
Climaveneta Comments: Complied
Air Flow Sensor
The unit should have inbuilt Air Flow Rate Feedback Sensor to display the real time Airflow rate and also to have fan
modulation function based on Pressure differential or Airflow rate.
Climaveneta Comments: Complied
Supply Air Sensor
The unit should have inbuilt Supply Air Flow Temperature sensor to show real time Supply Air Temperature on the
display of the unit.
Climaveneta Comments: Complied
Microprocessor Control System Logic Circuitry:
A microprocessor shall continuously monitor operation of each Server room air-conditioning unit
continuously digitally display room temperature and room relative humidity, alarm on system malfunction and
simultaneously display problem. It should also display the Suction, Discharge Temperature and Pressure of the
refrigerant along with the superheat. All the required transducers should be part of the Refrigerant circuit
accessories. When more than one malfunction occurs, flash fault in sequence with room temperature, remember
CLIMAVENETA CLIMATE TECHNOLOGIES (P) LTD.
# 415, 4th Floor, Qutab Plaza
DLF Phase-1, Gurugram
Haryana-122001
Tel: +91-124-6468951/52/53, Fax: +91-124-4000390
E-mail: sales@climaveneta.in
alarm even when malfunction cleared, and continue to flash fault until reset. A RJ45 port for IP communication,
including a reading and writing Modbus TCP/IP shall be provided.
Microprocessor to control the following functions:
• Return Air temperature/Delivery Temperature
• Relative Humidity (HH versions)
• Speed of the delivery fans
• Speed of the condensation fans
• Timing of compressors with automatic rotation
• auto restart after a voltage failure
• integrated control of brushless DC compressor, with constant optimisation of operation;
• Alarm signal on two levels
• Controlled automatic reset of high and low pressure alarms Display of:
• Environment temperature;
• Humidity (HH versions);
• Description of the alarms;
• Functioning timer;
• State of controlled devices Malfunctions:
Climaveneta Comments: Complied we will provide Modbus RS485
Power Loss, Loss of Airflow, High Room Temperature, Low Room Temperature, High Humidity, Low Humidity,
Supply Fan Overload, and Water under Floor.
The standby unit should immediately come in action in the event of any alarm/failure of the working unit without
waiting for the temperature to increase to the high temperature limit thereby controlling the temperature of the data
Centre.
The unit should also be capable of starting the standby unit incase the temperature is not able to achieve with the
working units.
Automatic lead unit sequencing to extend equipment life and automatic rotation of standby unit should be part of the
microprocessor itself. Microprocessor must be suitable to control multiple units if required with hard wiring which
can be done at a later date.
In case of power failure the precision packaged unit shall start automatically without any body’s intervention.
Controllers shall be Microprocessor based with capability to generate alarm and networking of all units to rotate
(working + standby) units, equalized run time capability (for 2 or 3 packaged units), programmable timer, with
display of all parameters.
The unit’s microprocessor controller should have feature to enable all installed units to together to work in TEAM
MODE to extract maximum Cooling Efficiency by operating individual units on Part Load by virtue of Modulating
Compressor & Modulating Indoor Fan
Climaveneta Comments: Complied
Regards
Amit Pandey- Assistant Manager- Sales
9971298008- amit.pandey@climaveneta.in
CLIMAVENETA CLIMATE TECHNOLOGIES (P) LTD.
# 415, 4th Floor, Qutab Plaza
DLF Phase-1, Gurugram
Haryana-122001
Tel: +91-124-6468951/52/53, Fax: +91-124-4000390
E-mail: sales@climaveneta.in
