DAT’Air Installation Data
1.0 General Ensure you advise our factory within
7 days of any problems in transport.
i When installing, or if work has to
be done on a HIROTEC
DAT’AIR unit, you should follow 2.2 Lifting and Transporting
the instructions given in this
manual and those you find in the During unloading and positioning of
unit itself; in all cases take all the the unit, sudden or violent
necessary precautions for movements should be avoided. A lift
personnel safety. truck can use the base pallet to lift
the unit. Handling inside the
i Pressures in the refrigeration premises must be done with care,
circuit, electrical components, and no part of the machine should
sharp parts and the centrifugal be used as a lever for moving into
fan could be harmful during position.
installation and maintenance
work. All units should be placed on the
floor or on a suitable platform, and if
Consequently, any work on the required, install suitable isolation
unit should be carried out by mounts to reduce any vibration.
skilled and qualified people.
i The guarantee shall be deemed 2.3 Base
immediately ineffective in the
case of non compliance with the The equipment needs no special
instructions provided in this base since it is not particularly
manual and if any alteration is heavy and vibration transmission is
made to the unit for which minimal. If the unit is to be installed
authorisation has not been given. on a raised floor it can be placed
directly on the raised floor with, a
Attention: before carrying out seal under the unit. The holes in the
any work on the unit, turn power floor, through which cables and
pipes pass, are indicated in the
off.
dimensional drawings.
Inspection, Transportation, We recommend placing a stiff
Positioning rubber strip between the floor and
the unit base.
2.1 Inspection
Always check the maximum
Upon receipt of your unit, please permitted load of the floor on which
check everything is in good order the unit is to be positioned. The unit
and condition as the equipment left base must be level to ensure proper
the factory in perfect condition and drainage.
the carrier should be notified
immediately if any damage is found. Support stands should be adjustable
Our firm must be informed in writing in order to compensate for concrete
within 7 days, with details of the floor irregularities and to ensure that
extent of the damage. the base of the equipment is
horizontal.
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DAT’Air Installation Data
2.4 Air Distribution
2.5 Room Characteristics
Air treated by HIROTEC DAT’AIR
conditioners is used to condition the The ceiling, walls and floor of the
environment, in which the unit is room should have a vapor barrier to
operating after having passed prevent the ingress or egress of
through the floor plenum (Under moisture between the room and
unit) or a distribution duct (Over unit) outside.
which forms the supply plenum.
Installations and
Ducting must be designed in the
Connections
proper way to allow adequate airflow
to the unit and provide optimal
working operation. For this reason,
3.1 Installation Clearance
duct pressure drop should not
exceed the available static pressure
given by the fans (in the case of Clearances indicated in the unit’s
particular applications please dimensional drawings must be
consult our Technical Department). complied with.
When installing ductwork please In the case of multiple installations,
observe the following it is possible that some spaces are
recommendations: common to several units: in this
case contact our HIROTEC
Technical Department for advice.
i Duct work branch should be
avoided at a distance less than 1
The following connections are
metre from the discharge; if this
required to install a DAT’AIR unit:
solution is not viable it is
recommended to install sound
absorbing material and grilles in i Refrigeration connections (*EDA
the duct) versions)
i Duct must be connected to the i Condenser pipes (*EDW version)
unit with a flexible joint in order
to avoid vibration transmission i Water pipes to water coils (*FC
from the unit to the ductwork. versions)
i All the connections in the i Connection to the condensation
ductwork must be sealed in order drainage
to avoid air leaks from the duct.
i Connection to the humidifier
The number of outlets is extremely
important in that if there are i Wiring
insufficient outlets it could cause:
*Denotes available in both under and over
air discharge configuration.
i A decrease in the airflow rate,
resulting in poor unit
performance and efficiency, and
consequently an increase in
running costs.
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DAT’Air Installation Data
Pipe diametres can be seen in Table
3.2 Connection to Remote 3.1 depending on the unit size and
Aircooled Condensers length of run. Further information on
pipe sizes can be obtained by
The route between the HIROTEC contacting our Technical
DAT’AIR unit and the air cooled Department.
condenser should not exceed 25-30
metres (equivalent length), if Note: air cooled units are
necessary call our Technical shipped with a 3 bar precharge
Department or use water cooled of nitrogen
models where long pipe runs are
required. Table 3.1 Refrigeration Lines
(*EDA version) (‘)
All refrigeration piping should be
installed by a qualified Refrigeration Model Hot Gas Liquid
Technician in accordance with good 50 16 12
refrigeration practice and Local
Regulations. 80 16 12
100 16 12
The route should be the shortest 110 16 12
possible to reduce the quantity of
freon in circulation and system 140 18 12
pressure drops. If copper pipes have 150 18 12
to cross over electrical cables it is
170 18 12
advisable to insulate between the
two. 180 18 12
230 18 12
Pipe insulation, unless otherwise
required by the Customer, can be 235 18 12
limited to the following locations; 260 22 16
350 22 16
a) Hot gas and liquid lines that run
in the raised floor cavity of the 440 28 16
facility. 520 28 16
550 28 16
b) Hot gas lines that are exposed to
low ambient temperatures 280 18 12
(available on request). 360 18 12
460 18 12
The maximum difference in height of
10 metres from the HIROTEC 13V 18 12
DAT’AIR to the air cooled 15V 22 16
condenser(s) is recommended.
20V 22 16
On rising vertical hot gas pipes, 26V 28 16
traps or syphons should be fitted 30V 28 16
every 6 metres to allow oil
(‘) valid for lenths up to 30 m (equivalent
circulation in the system. On
length).
horizontal hot gas discharge
pipelines a minimum 1% slope (in
flow direction) should be installed to
achieve oil return to the compressor.
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DAT’Air Installation Data
3.2.2 Pipe Installation Dust in the pipes can cause damage
and lead to the premature failure of
Pipe installation is one of the most the system.
important operations to have an
efficient refrigerant system.
Pipe bending should be carried out
Pipes must be handled with care to with a proper pipe bending tool
avoid damage. using pulleys and with a curve
dimension of the same size as the
Pipes should be cut to the exact size pipe diametre.
with a proper pipe cutter, pipes must
then be cleaned to remove dust and
swarf. 3.2.3 Refrigeration Pipe
Connections
Once refrigerant pipes are installed,
they should be connected to the
indoor and outdoor sections – not
left open.
Unit Refrigerant Pipe Connections
MINIDAT & CONSOLE
Model
50 80 110 150 170
O/UEDA
Hot Gas Line
16 16 18 18 18
O.D. Copper (mm)
Liquid Line
12 12 12 12 12
O.D. Copper (mm)
MODULAR
Model
100 140 180 230 235 260 350 440 520 550
O/UEDA
Hot Gas Line
18 18 18 18 18 22 22 22 22
O.D. Copper (mm) 22
Liquid Line
12 12 12 12 12 16 16 16 16
O.D. Copper (mm) 16
BIGDAT UNITS
Model
280 360 460 13V 15V 20V 26V 30V
O/UEDA
Discharge Line
2×18 2×18 2×18 2x22 2×22 2×22 2×22 2×22
O.D. Copper (mm)
Liquid Line
2×12 2×12 2×12 2x16 2×16 2×16 2×16 2×16
O.D. Copper (mm)
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DAT’Air Installation Data
Once connections have been Refrigeration piping on air cooled
completed, it is necessary to clean systems should be flushed and
the circuit by using nitrogen, after pressure tested for leaks with dry
which a vacuum must be obtained in nitrogen.
the pipes and condenser using the
charging port fitted in the system. At this point, shut-off valves fitted in
the unit must be opened. Nitrogen
We strongly advise against using gas will transfer through the
the compressor as a vacuum pump, refrigerant circuit. Leaks must be
in this case the guarantee is checked in the pipe connections
deemed ineffective. with a leak detector and a vacuum
of 300 microns achieved.
Table III – Units Refrigerant Charge R22 – R407c [kg]
MODEL 50 80 110 150 170 100 140 180 230 235
*EDA (‘) 2.2 2.4 2.6 4.0 4.4 2.6 4.0 4.4 4.7 5.8
*EDW 1.0 1.3 1.5 1.9 2.4 1.5 1.9 2.4 2.7 3.4
MODEL 260 350 440 520 550
*EDA (‘) 8.3 8.9 9.6 10.5 12.6
*EDW 3.8 3.9 4.2 4.5 5.4
MODEL 280 360 460 13V 15V 20V 26V 30V
*EDA (‘) 8.0 8.8 9.4 12.5 16.6 17.8 19.2 21.0
*EDW 3.8 4.8 5.4 6.5 7.6 7.8 8.4 9.0
(‘) Denotes fitted with air-cooled condenser.
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DAT’Air Installation Data
3.3 Piping Connections servo controlled modulating valve
operated by a microprocessor
controller in accordance with the
3.3.1 To the Water Condenser environmental temperature load and
(*EDW) humidity load (HH versions).
Threaded copper pipes are used for
water pipe connections on all units.
Inlet and outlet connections are
shown in the technical data sheets
(section 2). The water cooled
models are designed to run with
cooling tower or closed circuit dry
coolers.
Supply water pressure should range
from 2-10 bar, if this differs please
contact our Technical Department.
A pressure regulating valve is fitted
to all units operating with a cooling 3.3.3 Condensate Drainage
tower.
A condensate drain connection is
Water flow rates and the relative required for the condensate tray.
pressure drops are given in the Install a trap to avoid the return of
technical details. It is recommended bad smells and to ensure the correct
to fit ball valves at the inlet draining of the system. Once this
and outlet of the condenser, so the operation is completed, verify that
air conditioner can be isolated in the condensate is properly draining by
case of extraordinary maintenance, filling the tray with water away from
or if they have to be relocated. the draining hole.
3.3.4 Connection to Humidifier
Note: “condenser water inlet” (HH Versions)
identifies the inlet water
connection. For those units, fitted with a
humidifier, connect the inlet to a
filtered water supply and outlet to a
All condensers assembled on
drain system. The humidifier
dat’air units are of the plate type,
controller detects water hardness
for this reason we strongly and automatically drains the salt rich
recommend the installation of a water.
metal mesh filter on the water
inlet pipe, mesh max.1 mm For additional instructions see the
humidifier’s use and maintenance
3.3.2 To the Cooling Coil (*FC) manual (CDD).
Threaded connections are used for Warning: do not supply
water pipe connections on all units. demineralised or softened water
Inlet and outlet connections are into the humidifier! Supply water
shown in the technical data sheets. pressure should be between 0.3
Each unit is fitted with a three way, and 0.6 bar.
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DAT’Air Installation Data
3.3.5 General Advice on Water Cable section and line
Pipe Connections protections should conform to
the information given on the
i Gate or globe valves to isolate wiring diagram and local
the unit from the water circuit. requirements.
i Metal mesh filter (in the inlet Supply voltage should not be
pipe) with a maximum mesh of 1 subject to variations greater than
mm, to protect the heat +5% and the unbalance between
exchanger from waste or phases should always be lower than
impurities present in the pipes. 2%.
i Air valves, located at the highest If this is not the case, contact our
point of the water circuit, to allow Technical Department to decide
bleeding of air from the system. upon the most appropriate
protection.
i Automatic filling valves to
maintain system pressure and to Electrical connections should be
compensate for thermal carried out following the instructions
expansion. given on the wiring diagram supplied
with the unit.
i Drain cock, and where
necessary, a drainage tank to Earthing is compulsory by law. The
empty the unit for maintenance. installer shall connect the earth
cable to the earth bar on the
3.4 Electrical Power and electrical panel.
Earthing Power for the control circuit is from
the main line through a transformer
located in the electric panel.
3.4.1 General
The control circuit is protected by a
i Check visually that the electrical circuit breaker.
circuits have not been damaged
during transportation. Wiring diagrams are attached to the
equipment inside the electric panel.
i Check that the screws on all The power cable has to be
various terminals are well connected to the input terminals.
secured.
i Check that supply voltage
corresponds to the unit’s nominal
data (voltage, phases and
frequency) shown on the label on
the equipment.
For cable entry, use the special hole
in the base of the unit(s).
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DAT’Air Installation Data
3.4.2 Alarm and External HIROTEC DAT’AIR units are
Connections designed to work properly over a
wide operating range, it is highly
In the terminal block. there is a recommended not to exceed these
voltage free contact for a general operating limits, room temperature,
alarm. outdoor air and water temperatures.
For a remote ON-OFF of the unit, If this situation should occur the unit
connect the external switch to may stop due to safety devices In
contacts indicated in the wiring the worst case, it may fail. These
diagram. limits are reported in Table 1. If
there is need to exceed these limits,
N.B: The external switch disables please contact our Technical
the ON-OFF control on the small Department.
front panel of the unit.
Refrigerant Relief Valve
When carrying out the connections
described, follow exactly the Each (Direct Expansion) unit is fitted
instructions given in the wiring with a relief valve on the liquid line in
diagram. order to reduce the risk of damage
to the system in the event of high
system pressure.
Operating Limits
Table 1 – Operational Limit
Air Cooled
Min Max Min Max
Room inlet 18 30 Condenser Inlet air temperature °C 15 40
air temperature °C
Water Cooled
Min Max Min Max
Room inlet 18 30 Condenser inlet water 19 47
air temperature °C temperature °C
Outlet water temperature °C 27 50
Water thermal difference °C (‘) 3 8
(‘) Water thermal difference must always guarantee water inlet-outlet operation limit
Table II – Freezing Point for Water Ethylene Glycol Mixtures.
Weight percentage % 10 20 30 40 50
Freezing point °C -4.8 -9.9 -17.2 -26.6 -38.3
Table III – Control and Safety Devices, Factory Settings .
CONTROL/SAFETY DEVICE SET POINT DIFFERENTIAL RESET TYPE
Control Thermostat °C 24 2 --
Control Humidstat (HH versions) % 50 2 --
High pressure switch bar 26 7.7 Manual
Low pressure switch bar 0.7 1.0 Automatic
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