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Description
The HW HP is a ready-to-use compact heating device and con-
sists mainly of the domestic water cylinder, the components for
the refrigerant, air and water circuits, as well as all control, regu-
lation and monitoring devices required for automatic operation.
The desired fan level (3 levels) can be selected using a wired re-
mote control.
With the help of electrical energy, the HW HP uses the heat
stored in the drawn-in air for domestic hot water preparation. The
HW HP reaches its highest output at the highest fan level. The
devices are equipped with an electric heating element (1.5 kW)
as standard.
The electric heating element fulfils four functions:
Supplementary electric heating system
The heating-up period is approx. halved by switching on the
heating element (using the "heating element" switch, see the
chapter 6.2 "HW HP Operation") in addition to the heat
pump.
Frost protection
If the air temperature falls below 8 ±1.5 °C (switch-back
value 3 K), the electric heating element switches on auto-
matically and (nominally) heats the water up to the set hot
water temperature. The hot water temperature generated by
the heating element in antifreeze mode can exceed the set
value!
Emergency heating
The domestic hot water supply is maintained by the heating
element when the heat pump is out of order.
Higher water temperature
If the required hot water temperature is higher than the tem-
perature achievable by the heat pump (approx. 60 °C), it can
be raised to a max. of 85 °C by means of the heating ele-
ment.
ATTENTION!
When the hot water temperature reaches > 60 °C, the heat pump switches
off and the domestic hot water is heated solely by the heating element.
The heating element controller is factory set to 65 °C.
2.1 Refrigerant Circuit (Heat Pump
Operating Principle)
The refrigerant circuit is a closed-loop system in which the refrig-
erant R134a is the circulating energy carrier. The finned heat ex-
changer extracts heat from the drawn-in air at a low evaporation
temperature, and transfers it to the refrigerant. The vaporous re-
frigerant is sucked in by a compressor where it is compressed to
a higher pressure and temperature level before being trans-
ported to the liquifier, where the heat taken up in the evaporator
and part of the compressing energy is transferred to the water.
Subsequently, the high condensation pressure is lowered to the
evaporation pressure via a throttle mechanism (expansion
valve). In the evaporator, the refrigerant can once again extract
heat from the drawn-in air.
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2.2 Water Circuit
The water circuits for connecting the HW HP to the domestic hot
water supply are to be installed by the customer. The water con-
nections (illustration) are at the rear of the unit (see the Block
Diagram 1.3).
(Nominal width of air duct connection DN160 outer diameter 160
Important information:
Circulation pipe
For energy efficiency reasons, a circulation pipe should not
be used. If a circulation pipe is installed in the domestic hot
water distribution system, a valve or a similar device must be
provided as shut-off facility to avoid unnecessary energy
losses. Circulation is enabled according to use (time or re-
quirement control).
Condensate outflow
Please refer to the Chapter 5.2 "Connecting the Condensed
Water Pipe".
2.2
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