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2.1
Refrigeration Cycle
The refrigeration cycle is a closed system in which the refrigerant R134a circulates as an energy carrier. In a
finned heat exchanger, heat is extracted from the drawn in air at a low evaporation temperature and trans-
ferred to the refrigerant. The vaporous refrigerant is drawn in by a compressor and then compressed to a
higher pressure/temperature level; it is passed to the condenser where the heat absorbed in the evaporator
and part of the heat of the compressor motor is transferred to the water. Subsequently, the high condensing
pressure is reduced by means of a throttling device (expansion valve) to the level of the evaporating pres-
sure, and in the evaporator the refrigerant can again absorb heat from the drawn-in air.
2.2
Water Circuit
The water circuits of the HPWH are dependent on the specific type (with or without internal heat exchanger).
They have to be field-installed. The water connections (Fig. 1) are located at the rear of the unit.
Important Notes!
-
Circulation line
From an energy-efficiency point of view, the provision of a circulation line should be dispensed with, if
possible.
If a circulation line for the hot water distribution system is connected, it must be fitted with a valve or simi-
lar device enabling it to be shut off to avoid any unnecessary loss of energy. Enabling the circulation is ef-
fected as required (time or on-demand control).
-
Condensate drain: note Section 6.2 "Connection of Condensate Line".
Fig. 1: Water connections
Power supply /
cable entries
Hot water outlet
R1" external thread
Circulation line
R 3/4" external thread
Hot water supply
R1" external thread
Condensate hose
(brought out at bottom)
Heating water return
R1" external thread
Cold water supply
R1" external thread
160
Ø
1650
1610
1206
1)
898
ca. 30
700
200
35
0
max. 50
1) alternative condensate hose routing
660
160
Ø
20
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