Airwell AQH 120 [3/28] Electrical panel
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Airwell AQH 120 [3/28] Electrical panel

Airwell AQH 70 [3/28] Electrical panel
Page 3
General specifications (continued)
Integrated hydraulic module
An integrated hydraulic module is available for all Aqu@Logic air
cooled water chillers, offering savings in installation times and
reducing installation costs. Each hydraulic module comprises the
following components :
On models 20 to 35 : Automatic air bleed valve, differential
pressostat, drain cock, expansion tank, safety valve, pressure
gauge, hydraulic pump and water filter (supplied as a kit - not
fitted).
On models 40 to 130 : Automatic air bleed valve, water flow
adjustment valve, water flow switch, drain cock, expansion tank,
safety valve, pressure gauge, hydraulic pump and fitted water
filter.
As standard, all pumps produce available pressure higher than
100 kPa. A pump producing available pressure higher than
150 kPa can be supplied on request.
Other standard equipment :
Anti-vibration pads kit : The 20 to 130 models are supplied with
rubber anti-vibration pads as standard, to be fitted on site by the
installer.
Water flow switch or differential pressostat : For Aqu@Logic
units without an integrated hydraulic module, a factory-fitted
differential pressostat (for models 20 to 35) and a field-installed
paddle type water flow switch (for models 40 to 130) are supplied
as standard.
Water filter : Supplied loose.
Coil protection grilles : Aqu@Logic units are supplied with
heat exchanger coil protection grilles as standard.
Accessories and options :
Anti-vibration pads kit : For models 40 to 130. Visible spring
anti-vibration pads for the unit and the ground mounting holes. For
on site fitting by the installer.
Condenser coil protective coating :
- aluminium fins with hydrophilic coating,
- aluminium fins with polyurethane coating.
High pressure fans : For models 40 to 120 with ductable fans
providing external static pressure of 80 Pa (models 40 to 60) and
100 Pa (models 70 to 120).
400 V / 230 V transformer : For models 40 to 80 with electrical
supply without neutral.
Buffer tank kit : For air conditioning applications where it is not
possible to comply with the water volume ratio of 2.5 l / kW. This kit
comprises a factory-fitted module, mounted under the unit, and
supplied with the external hydraulic pipe work to be fitted on site.
The hydraulic module is fully encased in galvanised steel panels,
painted the same colour as the unit, and comprises a buffer tank,
fully insulated with 30 kg / m
3
density cellular polyurethane foam.
As standard, the buffer tank is equipped with anti-freeze protection
in the form of an immersion heater.
Remote control terminal : Hard-wired control enabling the unit’s
Start / Stop functions to be controlled remotely.
Phase monitor : Factory-fitted option enabling the compressor’s
rotational direction to be checked and to stop the unit if the mini-
mum voltage threshold is reached.
Low ambient kit (-18 °C) : Factory-fitted option available for
models 40 to 130.
Chiller sequencer : Supplied loose, it allows a control up to 4
units.
HP and LP manometers : Supplied loose.
Water isolating valves : Supplied loose.
Packaging : Sea worth or wooden crate.
Evaporator
- Direct expansion type, made of brazed stainless steel plates.
- The evaporator is surrounded by an electrical heating
resistance and insulated with cellular polyurethane foam to
provide anti-freeze protection down to an ambient temperature
of - 20 °C.
Air condenser
- Comprising a heat exchanger coil equipped with aluminium fins
mechanically crimped on to copper tubes.
Fan motor assembly
- Helicoidal type fans with direct drive by a dual speed motor
(Protection Index : IP 54), equipped with automatic reset internal
high temperature protection.
- Two 610 mm diameter horizontal flow fans on models 20 to 35,
one 800 mm diameter vertical flow fan on models 40 to 80 and
two 800 mm diameter vertical flow fans on models 90 to 130.
Each fan is equipped with a fan blade protection grille.
Refrigerant circuit
The refrigerant circuit comprises all the required components such
as filter-dryer, sight glass with moisture indicator, 4-way reverse
cycle valve and thermostatic expansion valve. It also comprises
high and low pressure sensors, as well as sensors for inlet and
outlet water temperatures and a discharge temperature sensor.
To facilitate maintenance operations, the low and high pressure
sections of the refrigerant circuit are equipped with pressure tapping
points.
All the refrigerant components and pipe work are brazed, thus
eliminating any risks of leakage and ensuring total, long lasting
circuit tightness.
Pressure transducers replace the HP (High Pressure) and LP
(Low Pressure) pressostats, along with their capillary tubes
(principal source of leaks).
The refrigerant circuit is optimised to operate with HFC 407C
refrigerant fluid.
Electrical panel
Access to the electrical panel is possible after having taken off the
panels, removable by just releasing quarter turn locks or screws.
The electrical panel of models 90 to 130 rotates to allow an easy
access for inspection inside the unit.
On models 20 to 35, the following equipment is mounted on the
power circuit side of the electrical panel : a power supply connection
terminal block - 400 V / 3 Ph / 50 Hz + Neutral, a main switch,
contactors and thermal relays for the compressors and the
hydraulic pump (if fitted). On the control circuit side of the panel,
the ILTC control electronic circuit board with its 230 V single phase
power supply is mounted.
On models 40 to 130, the following equipment is mounted on the
power circuit side of the electrical panel : a power supply connection
terminal block - 400 V / 3 Ph / 50 Hz + Neutral (models 40 to 80) or
400 V / 3 Ph / 50 Hz (models 90 to 130), a main switch, a main
terminal block, a distribution terminal block, the compressors
contactors, the thermal relays and contactors for the fans, and
the hydraulic pump (if fitted). On the control circuit side of the
panel, the ILTC control electronic circuit board with its 230 V single
phase power supply is mounted.

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