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2. Description
The HPCDW is a domestic water cooling unit ready for connection and essentially consists of a domestic water
tank, the components of the refrigeration, air and water circuits as well as all control, regulating and monitoring
devices required for automatic operation.
In accordance with the heat pump's principle of operation, unwanted heat is extracted from the domestic water and
then transferred to the discharged outlet air.
The unit is equipped as standard with an electric immersion heater (1.5 kW) which enables domestic water to be
heated (up to a temperature of max. 85 °C) (heating function).
2.1 Refrigeration
Cycle
(Heat Pump Principle of Function)
The refrigeration cycle is a closed system in which the refrigerant R134a circulates as an energy carrier. In a
tubular evaporator wrapped around the domestic water tank, heat is extracted from the domestic water at a low
evaporation temperature and transferred to the refrigerant. The vaporous refrigerant is drawn in by an electrically
driven compressor and compressed to a higher pressure/temperature level and then passed to the condenser (fin-
type heat exchanger), where the heat that is absorbed in the tubular evaporator and part of the heat of the
compressor motor is transferred to the drawn-in exhaust air. Subsequently, the high condensing pressure is
reduced by means of a throttling device (expansion valve) to the level of the evaporating pressure, and the
refrigerant can again absorb heat from the domestic water tank via the tubular evaporator.
2.2 Water
Circuit
The water circuits of the HPCDW are to be field-installed (by the customer).
The water connections (Fig. 1) are
located at the rear of the unit.
Fig. 1:
Water connections
Brauchwasserzulauf
R1" Außengewinde
Brauchwasserentnahme
R1" Außengewinde
20 - 35
0
1226
55
1620
1660
Ø
160
Ø
160
660
Domestic water supply
external thread R1“
Domestic water outlet tap
external thread R1“
