WWW.STIEBEL-ELTRON.COM WPL E | WPL COOL| 15
INSTALLATION
APPLIANCE INSTALLATION
Note
Never adjust the flow rate of the cylinder primary pump.
The flow rate of the cylinder primary pump has been
optimised 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 value is equal to or
lower than the maximum temperature differential.
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 tempera-
ture 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 chapter “Specification / Data table”).
If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
If necessary, adjust the setting of the delivery head to match
the heating circuit pump.
10.6.3 Using highly energy efficient pumps
If you use a highly energy efficient 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.
10.6.4 Heat pump application limit
The heat pump is switched off if the outside temperature falls
below the selected lower application limit for cooling (parameter
LIMITCOOLING).
10.7 Condensate drain
A condensate drain hose is fitted to the defrost pan to enable the
condensate to drain off. The condensate drain hose is delivered
inside the refrigeration unit.
Ensure the condensate drain hose is not kinked.
Route the hose with a continuous fall.
Use a suitable condensate pump if there is insufficient fall.
Observe the building characteristics.
If using a condensate pump, ensure that it is sized for a
pump rate of at least 6 l/min.
10.7.1 External installation
Route the condensate drain hose downwards through the
knock-out "outlet for supply pipe/cable" and out of the
appliance.
Channel the condensate into a drain or allow it to drain into a
coarse gravel soakaway. Ensure the pipework is free from the
risk of frost.
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