Installation manual

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Integration of the Heat Pump in the Heating System 8.12.7
8.12.7 Integration of renewable heat sources
Solar back-up for domestic hot water preparation
Fig. 8.36: Integration diagram (without safety valves) for a heat pump with solar back-up for domestic water preparation in
combination with a solar station (special accessory SST 25).
The SST 25 solar station offers
solar back-up for domestic hot
water preparation.
The primary and the secondary
cycle are separated via a plate
heat exchanger which can be
used for solar systems with a
collector surface of up to 10 m
2
.
Mode of operation:
The solar controller (N12) (must
be supplied by customer)
controls both circulating pumps
installed in the solar station if
there is a sufficiently large
temperature difference (T
solar
collector
> T
dhw
) between the
solar collector T
solar collector
and
the hot water cylinder T
dhw
.
Hot water preparation with the
heat pump should be blocked
during the day using the
adjustable time program on the
heat pump manager.
External supplementary heating and solar back-up for DHW preparation
Preconfiguration
Setting
Fig. 8.37: Integration diagram for mono energy heat pump operation with one heating circuit, buffer tank connected in series
with an external supplementary heating system and hot water preparation
Operating mode
Mono
energy
1. Heating circuit 1 Yes
2. Heating circuit 1 Yes
3. Heating circuit 1 No
Hot water
preparation
Yes
Request Sensors
Flange heater Yes
Swimming pool
preparation
No
Supplementary heating
The return flow sensor must be
fitted exactly in the position
illustrated in the diagram to
prevent the heat pump from
switching on when the buffer
tank is loaded.
The PSW 500 universal buffer
tank has a flange connection for
installation of a RWT 500 solar
heat exchanger. A safety
temperature monitor should be
installed when panel heating
systems are implemented
(Chap. 8.5.4 on p. 182).
With permanent charging
temperatures of over 50 °C the
heat pump must be blocked via
an additional thermostat for the
domestic hot water and
swimming pool water
preparation (ID4).
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