Airwell CLH 242 [2/28] Compressors
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Airwell CLH 242 [2/28] Compressors

Airwell CLH 242 [2/28] Compressors
Page 2
Technical Features
General
The CLH air-to-water reverse cycle heat pumps have been designed
to operate with the HFC 407C refrigerant.
They are complete with two independent reversible refrigerant
circuits fitted with a high efficiency and low vibration level Scroll
compressor on each circuit.
These units are suitable for outdoor installation on the roof of a
building or on the ground.
All the CLH units are completely factory tested in compliance with
the internal quality system specifications and procedures, and are
ready for field installation.
The "Plug and Play" concept has been introduced in each CLH
unit, thanks to the use of BMS compatible microprocessor-based
control system and to the integrated hydraulic module supplied
as optional on all versions of the CLH range.
Also, thanks to the versions and options available, the CLH air-to-
water heat pumps can fit all the demands of the market.
The CLH range is available in 5 versions; each version is composed
of 9 sizes.
CLH STD : Standard version fitted with standard equipment
intended for reliable operation. The CLH STD units cover a nominal
cooling capacity range from 41 to 131 kW and a nominal heating
capacity range from 46 to 152 kW.
CLH LN : Low noise version having same equipment as STD
version, except that it is fitted with low speed type larger size fans.
The CLH LN units cover a nominal cooling capacity range from
41 to 131 kW and a nominal heating capacity range from 46 to
152 kW.
CLH ELN : Extra low noise version fitted with greater heat
exchange surface area condenser coils, very low speed type fans
and a stepless fan speed controller. When the optional integrated
hydraulic module is supplied with electric heaters (EH), the fan speed
controller will be provided upon request, as optional, for external
mounting to the unit. Furthermore, the ELN version is equipped with
a reinforced soundproofing :
- mufflers mounted on compressor discharge lines (all sizes),
- soundproofing jacket on compressor (sizes 182 to 302),
- sound insulation on compressor compartment (sizes 352 to 602).
The CLH ELN units cover a nominal cooling capacity range from
41 to 131 kW and a nominal heating capacity range from 40 to
152 kW.
CLH HPF : High pressure fan version having same equipment as
STD version, except that larger size fans with 80 Pa external static
pressure are fitted on this HPF version. The CLH HPF units cover a
nominal cooling capacity range from 41 to 131 kW and a nominal
heating capacity range from 40 to 152 kW.
CLH SIF : Special inverter fan version having same equipment
as STD version but with special axial fan equipped with brushless
EC motor, fan speed stepless controlled by discharge pressure
sensor fitted on both refrigerant circuits. Fan speed range from
50 to 1150 rpm. Special inverter fans provide nominal external
static pressure up to 150 Pa, easily selectable on field by means of
software. CLH SIF units are available in 5 sizes (352 to 602) and
cover a nominal cooling capacity range from 88 to 131 kW and a
nominal heating capacity range from 100 to 152 kW.
Reference standards
The following applies to all the sizes and versions belonging to the
CLH units :
Performance test EN 12055
Machine Directive CEE 89 / 392
Low Voltage Directive CEE 73/23 (EN 60204-1)
Electromagnetic Compatibility Directive CEE 89/336 as modified
by Directive CEE 92/31 (EN 50081-1, EN 50082-2)
Cabinet and structure
The unit structure shall be of heavy gauge galvanized steel fastened
with non-corrosive screws and bolts. Galvanized steel parts shall be
painted with baked on enamel colored white (RAL 9001).
Compressors
Each unit shall be equipped with 2 Scroll hermetic compressors.
Compressors on all models shall be mounted on rubber anti-
vibration pads and have direct on line starting.
The compressor motors shall be refrigerant gas cooled, with integral
thermistor protection against overloads. The overload protection is
automatically reset.
The motor terminal boxes shall have IP-54 weather protection.
Evaporator
Evaporators are of a brazed stainless steel plate type heat exchanger.
They are insulated with a closed cell foam material and are fitted
with an electric cable resistance to prevent the unit from freezing at
a low temperature when the unit is off.
Design working pressure shall be 10 bar on the water side and
30 bar on the refrigerant side.
Water connections are of a 2" gas male threaded type.
Condenser coils
The condenser coils shall be seamless copper tubes, arranged in
staggered rows, mechanically expanded into corrugated aluminum
fins.
Condenser coil fans
The condenser fans shall be direct drive with aluminum wing
contour blades. Each fan will have a painted galvanized steel
protection guard.
The totally enclosed fan motors shall have IP 54 degree of protection
and thermo-contact protection embedded in their windings.
Fan controls
Each unit can be equipped, as optional , with a stepless fan speed
controller, operating on the basis of condensing pressure, to keep
fan rpm under control in order to operate in cooling mode at a low
ambient temperature (-18 °C).
This fan speed controller is supplied as standard on the ELN units
without extra electric heating resistances (EH) and as optional on
ELN units with EH resistances. However, it is not available on HPF
units.
Refrigerant circuits
All the units are composed of two independent and separate
refrigerant circuits. All the components that constitute each circuit
are shwon on the functional diagram (see chapter "Refrigerant flow
diagram").
Integrated hydraulic module (optional)
Units can be supplied with optional integrated hydraulic module
composed of water tank and 1 or 2 pumps complete with
accessories.
Antifreeze heater is supplied as standard in the tank.
The hydraulic module can be fitted, as optional, with an extra
electric heating (EH).
Units can also be supplied with pump kit only (with 1 or 2 pumps).

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