Air-to-water heat pump
Reverse cycle air-to-water heat pump with manual mode switch. The
unit is supplied with anti-freeze oil and refrigerant and has been factory
tested. On-site installation therefore just involves making connections
to the mains power and water supplies.
Unit charged with R407C ecological refrigerant.
STANDARD UNIT COMPOSITION
Frame comprising a base in polyester-painted hot-galvanised sheet
steel and supporting panels in Peraluman. The panels of the
compressor housing are covered by a layer of high density
sound-absorbing material. The self-supporting structure containing the
main components is designed to ensure maximum ease of access
during servicing and maintenance operations.
Compressors
Hermetic scroll compressors. All the compressors are fitted with an oil
sump heater, electronic overheating protection with centralised manual
reset (thermal contact on size 0302) and a two-pole electric motor.
Water-refrigerant heat exchanger
AISI 316 steel braze-welded plate exchanger. The heat exchangers are
insulated with a closed-cell condensation proof lining in neoprene. A
thermostatically controlled electric heater prevents ice from forming
inside the evaporator when the unit is not working. When the unit is
working, it is protected by a differential pressure switch mounted on the
water side. The unit can work with antifreeze mixtures at exchanger
outlet temperatures as low as -8℃.
Refrigerant-air heat exchanger
Finned coil exchanger made from copper tubes and aluminium fins.
The aluminium fins are correctly spaced to guarantee optimum heat
exchange efficiency.
Fans
Axial electric fans, protected to IP 54, with external rotor and pressed
sheet metal blades. Housed in aerodynamic hoods complete with
safety grille. 6-pole electric motor with built-in thermal protection. The
fan chamber is divided into two sections. This improves efficiency with
partial loads as the fans of the idle circuit can be stopped.
Refrigerant circuit
Main components of the refrigerant circuit:
- compressor discharge and suction shut-off valve
- dryer filter,
- refrigerant line sight glass with humidity indicator,
- externally equalised thermostatic valve,
- high and low pressure switches,
- liquid receiver and separator,
- 4-way reverse cycle valve.
Electric power and control panel
Electric power and control panel, built to EN 60204-1/EC 204-1 standards, complete with:
- control circuit transformer,
- general door lock isolator,
- automatic circuit breakers for compressors and fans,
- contactors for compressors,
- terminals for cumulative alarm block (BCA),
- remote ON/OFF terminals,
- spring-type control circuit terminal board,
- electric panel with double door and seals for outdoor installation,
- electronic controller.
- Control circuit numbered wires
- Pump control consent relay
- Fan speed continuous regulation.
Model with partial heat recovery (D)
Reverse cycle air-water heat pump fitted with a desuperheater.
Similarly to the basic unit, this version produces hot or chilled water in
the primary circuit, depending on which seasonal mode has been
selected. Compared with the basic configuration, this version features a
water/freon heat exchanger on the gas delivery line. This heat
exchanger, fitted in series with the traditional cooling circuit condenser,
is large enough to recover just desuperheating heat for the production
of medium-to-high temperature water (secondary or recovery circuit).
Hot water can be produced in the recovery circuit for domestic hot
water and the like both in summer and winter. The heating capacity of
this circuit is approximately equal to the power input of the compressor.
After going through this exchanger, the refrigerant gas enters the
condenser (refrigerant-air exchanger in summer and refrigerant-water
exchanger in winter) where condensation is completed. There are two
operating cycles:
WINTER MODE
The exchanger to which the main water circuit is connected works as a
condenser (the refrigerant-air exchanger works like an evaporator). The
refrigerant-water exchanger for partial heat recovery (desuperheater)
allows hot water to be produced in a second hydraulic circuit for
domestic hot water and the like.
SUMMER MODE
The exchanger to which the main water circuit is connected works as
an evaporator (the refrigerant-air exchanger works like a condenser).
The refrigerant-water exchanger for partial heat recovery
(desuperheater) allows hot water to be produced in the same way as
the winter mode.
Accessories
Rubber isolators
Cu/Cu condensing coils
Condensing coils with epoxy-coated fins
Condensing coils with Fin Guard Silver treatment
Condensing coil protection grilles
230/3/50 power supply
Remote keyboard
Phase sequence relay
Connecting kit to HPGA (supplied separately)
Evaporator steel filter kit (supplied separately)
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