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3 Product description
23 hours, are switched on for 10–20 seconds, one after the
other.
3.2.5
Safety cut-out (SCO) in the heating circuit
If the temperature in the heating circuit of the internal elec-
tric back-up heater exceeds the maximum temperature, the
safety cut-out shuts down the electric back-up heater as a
securing measure. After it is triggered, the safety cut-out
must be replaced.
–
Max. heating circuit temperature: 95 ℃
3.3
Cooling mode
Depending on the country, the product has the heating mode
or heating and cooling mode function.
An optional accessory can be used to subsequently activate
the cooling mode.
3.4
Functions of the heat pump
The heat pump has a closed refrigerant circuit in which refri-
gerant circulates.
In heating mode, cyclic evaporation, compression, liquefac-
tion and expansion take in heat energy from the surround-
ings and transfer it to the building. In cooling mode, heat
energy is extracted from the building and released into the
environment.
3.4.1
Operating principle, heating mode
2
1
3
5
1
Evaporator (heat ex-
changer)
2
4-port diverter valve
3
Fan
20
4
6
4
Compressor
5
Expansion valve
6
Condenser (heat ex-
changer)
3.4.2
Operating principle, cooling mode
Applicability: Product with cooling mode
2
1
3
1
Condenser (heat ex-
changer)
2
4-port diverter valve
3
Fan
3.5
Description of the product
The product is the indoor unit of an air-to-water heat pump
with split technology.
The indoor unit is connected to the outdoor unit via the refri-
gerant circuit.
3.6
Product overview
3.6.1
Product design
6
5
4
1
Unit mounting bracket
Installation and maintenance instructions Hydraulic station 0020257319_02
4
5
6
4
Compressor
5
Expansion valve
6
Evaporator (heat ex-
changer)
1
2
Expansion vessel
2
3
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