14 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Electrical connection
10.7 2. Heat source
For dual mode systems, the heat pump must always be connected
to the return of the second heat source (for example an oil boiler).
10.8 Safety temperature controller for underfloor
heating system
!
Material losses
In case of failure, in order to prevent an excessively high
flow temperature in the underfloor heating system, we
generally recommend the use of a safety temperature
controller to limit the system temperature.
11. Electrical connection
Note
Observe the heat pump manager operating and instal-
lation instructions.
Only qualified electricians may carry out the installation in accord-
ance with these instructions.
Permission to connect the appliance may need to be obtained from
your local power supply utility.
Observe chapter “Preparing the electrical installation”.
DANGER Electrocution
Before any work, isolate the appliance from the power
supply at the control panel.
Note
The terminals are located in the appliance control panel.
1
26�03�01�1644�
2
1 Cable duct
2 Control panel
For installation purposes, pull out the control panel forward
from the casing.
Use appropriate cables in accordance with local regulations
for all connections.
Check the function of the strain relief fittings.
Connect the circulation pump for the heat utilisation side to
the heat pump manager in accordance with the technical
documents.
For external installation, route the cables through the cable
duct provided for this purpose.
11.8.1 Electrical connection of the WPL basic (three phase)
Connection X3: Appliance and electric emergency/booster
heater (DHC)
Connect the appliance to terminal X3.
Connect the electric emergency/booster heater to terminal X3
if you want to utilise the following appliance functions:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic op-
eration
If the heat pump cannot reach the dual mode point,
the electric emergency/booster heater ensures both
the heating operation and the provision of high DHW
temperatures.
Emergency mode
Should the heat pump suffer a fault that prevents its
continued operation, the heating output will be cov-
ered by the electric emergency/booster heater.
Heat-up program
(only for underfloor
heating systems)
The electric emergency/booster heater must provide
the drying heat in case of return temperatures <25°C.
With these low system temperatures, the drying heat
must not be provided by the heat pump, otherwise
the frost protection of the appliance can no longer be
guaranteed during the defrost cycle.
After expiry of the heat-up program, you can discon-
nect the electric emergency/booster heater if it is not
required for the appliance operation.
Please note that during the heat-up program, the
emergency mode cannot be selected.
Pasteurisation control
The electric emergency/booster heater starts automat-
ically when the pasteurisation control is active in order
to regularly heat the DHW to 60 °C to protect it against
the growth of legionella bacteria.
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