www.stiebel-eltron.com WPL 33 | 13
INSTALLATION
Installation
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
84_03_01_0156_
X Outside temperature [°C]
Y Maximum temperature differential [K]
In such cases, 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 implement-
ed with the remote control or indirectly by adapting 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 temper-
ature 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.
Note
Never adjust the flow rate of the cylinder circuit pump.
The flow rate of the cylinder circuit pump has been op-
timised at the factory.
Compare the resulting temperature differential between the
flow and return at the appliance with the diagram "Maximum
temperature differential on the heating side with overflow
valve or single room control with remote control".
Set the heating circuit pump so that the maximum tempera-
ture differential is achieved or undershot.
10.6.2 Flow rate with low loss header or buffer cylinder
The flow rate can be adjusted using the temperature differential
of the buffer circuit. The value must not fall below the minimum
flow rate.
Maximum temperature differential on the heating side with low
loss header or buffer cylinder
-15 -10 -5 0 5 10 15 20 25 30
0
2
4
6
8
10
12
14
84_03_01_0156_
X Outside temperature [°C]
Y Maximum temperature differential [K]
Make the settings at the circulation pump when the temper-
ature differential between the flow and return temperature
has stabilised.
Compare the resulting temperature differential between the
flow and return at the appliance with the diagram "Maximum
temperature differential on the heating side with low loss
header or buffer cylinder".
Set the head of the heating circuit pump to a level that safe-
guards the heating flow rate required to operate the heat
pump (see chapter "Specification / Data table").
If the appliance will be used for DHW heating, check the set-
ting of the pump head in DHW mode.
If necessary, adjust the head to match the heating circuit
pump.
10.6.3 Using highly energy efficient pumps [HE]
If you use a HE pump as the heating circuit pump, you will have to
adjust the minimum flow rate using the temperature differential
of the heating system.
Set the heating circuit pump to ∆p-constant.
Set ∆p-constant to the value at which the maximum temper-
ature differential of the heating system is reached.
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