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9.7
9.7 Control of Circulating Pumps
By controlling the heat, hot water or swimming pool circulating
pumps, it can be determined where the heat generated by the
heat pump should flow. Individual processing of different
requests enables the heat pump to be always operated with the
lowest possible flow temperature. This ensures energy-efficient
9.7.1
Heat Circulating Pump/Antifreeze (Frost Protection)
Two operating modes are possible for heat circulating pumps
which can be set in the "Settings"menu.
Heating pump optimisation is set to "No": The heat circulating
pump always operates, with the exception of DHW heating,
swimming pool heating and in the "Summer" operating mode.
Heating pump optimisation is set to "Yes": The heat circulating
pump continues to run for 30 minutes after a power up and after
switch-off of the heat pump.
If the heat circulating pump was switched off for more than 40
minutes or the return flow temperature has dropped below the
set value, it is switched on for 7 minutes to supply the return flow
If a switchover is made from heating operation to DHW
preparation or swimming pool water preparation, the heat
circulating pump continues to run for at least 1 minute.
The
heating
pump
operates
temperatures lower than 3 °C, at return flow temperatures lower
than 15 °C and at temperatures lower than 6 °C on the flow
sensor of air-to-water heat pumps.
9.7.2
Hot water circulating pump
The hot water circulating pump (DHW loading pump) operates
during DHW heating. If a request for domestic hot water is made
during heating operation, the heat circulating pump is
deactivated and the hot water circulating pump is activated with
the heat pump running.
9.7.3
Swimming pool water circulating pump
The swimming pool circulating pump operates while the
swimming pool water is being heating. The swimming pool water
heating can be interrupted at any time by a request for domestic
hot water, defrosting or by raising the heating characteristic
curve (e.g. after lowering the temperature at night), but not by a
"more" signal from the heating controller. If the request is still
pending after the swimming pool water has been heated for 60
minutes, the swimming pool circulating pump is switched off for 7
minutes and the heat circulating pump is switched on to supply
9.7.4
Auxiliary circulating pump
The output of the auxiliary circulating pump can be configured to
allow parallel operation of the auxiliary circulating pump and the
heat pump's compressor. Configuration is possible for heating,
DHW preparation and swimming pool water preparation. It also
operates if the return flow temperature has fallen below 15 °C,
or, in the case of air-to-water heat pumps, the temperature has
fallen below 6 °C on the flow sensor.
In the summer operating mode, the auxiliary circulating pump
operates for 1 minute every 150 hours.
EN-30
continuously
at
external
operation. With heat pumps for heating and cooling, additional
cold circulating pumps can be controlled (Chap. 12 on p. 33).
NOTE
Pump units with check valves maintain the specified flow direction.
sensor with the representative temperature of the heating circuit
again (flushing period).
Independent of the setting, the heat circulating pump always
operates in heating or defrost operation and when there is
danger of frost. In systems with several heating circuits, heat
circulating pumps 2 and 3 have the same function.
ATTENTION!
To ensure that the frost protection function of the heat pump works
properly, the heat pump manager must remain connected to the power
supply and the flow must be maintained through the heat pump at all
times.
NOTE
In the summer operating mode, the heating pump operates for 1 minute
every 150 hours (this prevents the heating pump from sticking at the
beginning of the heating period).
In the case of heat pumps with additional heat exchangers and
Setting – Parallel heat - DHW set to "Yes", the hot water pump
operates parallel to the heating pump during heating operation
until the set maximum temperature is reached.
the return flow sensor with the representative temperature of the
heating circuit again. If the heating controller generates a "more"
signal during these 7 minutes, the request for heating will be
processed first.
NOTE
In the summer operating mode, swimming pool water preparation is not
interrupted after 60 minutes by a flushing period.
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