10 | WPL 10 www.stiebel-eltron.com
INSTALLATION
Installation
10.9 Flow rate, heating side
10.9.1 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 and heating circuits in conjunction with area heating sys-
tems [underfloor heating systems, for example].
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 made 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 generator.
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
84_03_01_0156_
X Outside temperature [°C]
Y Maximum temperature differential [K]
In such cases, one or more heating circuits in the heating sys-
tem must remain 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
implemented 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.
10.9.2 Flow rate with low loss header or buffer cylinder
The flow rate can be adjusted using the temperature differential
of the buffer circuit. In this case, the minimum flow rate must not
be undershot.
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 delivery head of the heating circuit pump to a level
that safeguards the heating flow rate required to operate the
heat pump (see the "Specification / Data table" chapter).
If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
If necessary, adjust the delivery head to match the heating
circuit pump.
10.9.3 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.
To Next Page
Loading...
Need help?
General
