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INSTALLATION
APPLIANCE INSTALLATION
10.5.3 Venting the heating system
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1
1 Quick-action air vent valve
Vent the pipework carefully.
In doing so, also activate the quick-action air vent valve.
10.6 Flow rate, heating side
10.6.1 Minimum flow rate for operation without a buffer
cylinder
The appliance is designed in such a way that no buffer cylinder
is required to provide hydraulic separation of the flow in the heat
pump circuit and the heating circuit in conjunction with space
heating systems.
In an installation with several heating circuits, we recommend
using a low loss header.
The minimum flow rate is set via the temperature differential of
the heating system.
Set the heating circuit pump so that the value is equal to or lower
than the maximum temperature differential.
The setting is made in heat pump operation alone. For this, the
following settings must be carried out first:
Temporarily remove the fuse from the electric emergency/
booster heater to isolate it from the power supply. Alterna-
tively, switch OFF the second heat source.
Operate the heat pump in heating mode.
Minimum flow rate with single room control via FE7orFEK
Maximum temperature differential on the heating side with over-
flow valve or single room control with remote control
-15 -10 -5 0 5 10 15 20 25 30
0
2
4
6
8
10
12
14
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X Outside temperature [°C]
Y Maximum temperature differential [K]
In this case, one or more heating circuits in the heating system
must be left open. The open heating circuit(s) should be installed
in the lead room (room in which the remote control is installed,
e.g. the living room). Single room control can then be carried
out with the remote control or indirectly by matching the heating
curve.
Fully open the heating circuit(s) in the lead room.
Close all other heating circuits.
If an overflow valve is installed in the heating system, close
this fully before determining the minimum flow rate.
Make the settings at the circulation pump when the tempera-
ture differential between the flow and return temperature
has stabilised.
Set the heating circuit pump so that the minimum flow rate re-
quired to operate the system is safeguarded.
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