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2
Purpose of Heat Pump
2.1 Field of Application
The air-to-water heat pump is to be used exclusively for the heat-
ing and cooling of heating water. It can be used in new or previ-
ously existing heating systems.
The heat pump is suitable for mono-energetic and bivalent oper-
ation.
During heating mode, a heating water return temperature of
more than 18 °C must be maintained in order to assure proper
defrosting of the evaporator.
The heat pump is generally not designed for satisfying any in-
creased heat demand during the drying phase of new buildings.
The additional heat demand must therefore be met by special ap-
pliances to be supplied on site. For the structural drying of new
buildings during autumn and winter, its is recommended that an
additional electric heating element (available as an accessory)
be installed.
ATTENTION!
The unit is not suited for operation with a frequency converter.
2.2 Principle of Operation
Ambient air is drawn in by the fan and passed over a finned heat
exchanger, which extracts heat from the air in the heating mode
or gives off heat to the air in the cooling mode. This energy differ-
ence is transferred to the working fluid (refrigerant) in the heat
exchanger.
With the aid of an electrically driven compressor, the absorbed
heat is "pumped" to a higher temperature level through pressure
increase and - depending on the particular application (cooling or
heating) - is given off to the heating water or the waste air via the
heat exchanger.
During heating mode, electrical energy is used to raise the heat
of the environment to a higher temperature level. Due to the fact
that the energy extracted from the air is transferred to the heating
water, this type of appliance is referred to as air-to-water heat
pump.
The air-to-water heat pump consists of the following main com-
ponents: evaporator, fan and expansion valve as well as the low-
noise compressor, a condenser and the electric control unit.
In the case of low ambient temperatures in the heating mode,
moisture contained in the air may accumulate on the evaporator
in the form of frost thus impairing the heat transfer. Uneven
accumulation during this process does not indicate a fault. The
evaporator is defrosted automatically by the heat pump as re-
quired. Steam may be emitted from the air outlet depending on
the atmospheric conditions.
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3
Scope of Delivery
3.1 Baseline Unit
The heat pump is deliverd as a compact unit containing the com-
ponents listed below.
The refrigerant circuit is hermetically sealed. It contains the
Kyoto protocol approved refrigerant R407C with a GWP value of
1525. It is CFC-free, does not deplete ozone and is non-flamma-
ble.
1)
Evaporator
2)
Control box
3)
Fan
4)
Pressostats
5)
Expansion vessel
6)
Receiver/filter drier
7)
Circulat. pump
8)
Electric heater
9)
Compressor
3.2 Control Box
The control box is integrated in the heat pump. It is accessible
after removal of the cover panel (the fastening screw holes of the
cover panels are capped).
The control box houses the mains terminals, the power contac-
tors, the soft start unit as well as the terminals for the remote con-
trol.
The control of the heat pump is effected via the remote control in-
cluded in the scope of delivery (see also section 8.).
3.2
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