Stiebel Eltron LWE 40 Installation page 31

INsTALLATIoN
Installation
5.2.1 Control unit and power supply unit
Material losses
Interchanging the connections may result in control unit
malfunctions.
Note
When using a differential pressure switch, always in-
terrupt the power supply to the control unit or power
supply unit.
Power supply unit for 2 appliances
f Install the power supply unit in the bottom half of the double
flush box.
f Install the control unit in the top half of the flush box.
f Connect the control unit to the power supply unit as per the
wiring diagram.
f Observe the imprint on the control unit.
Power supply unit for more than 2 appliances
f Connect a dedicated MCB upstream of the power supply unit
installed in the control panel.
The wiring from the control panel to the appliances is carried out
in a star pattern.
f Install the control unit in the flush box.
f Connect the control unit to the power supply unit as per the
wiring diagram.
f Observe the imprint on the control unit.
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5.2.2 Wiring diagram with more than 2 appliances
GND
GND
R1 DC +24 V
R2 DC GND
R3 Fan +24 V
R4 Fan GND
R5 Alarm
R6 Fan 1
R7 Fan 2
f Assign the appliances in pairs to the "Fan 1" and "Fan 2"
terminals. Of the pair of appliances working in differential
mode, one must be connected to the "Fan 1" terminal and
the other to the "Fan 2" terminal. Check whether the pairs of
appliances are working in differential mode. In differential
mode, one appliance transports the extract air out of the
building to the outside. The other appliance draws outdoor
air into the building.
Odd number of appliances
If there is an odd number, divide the appliances into two groups.
Connect the smaller group to the "Fan 1" terminal.
Number of fans
Number of appliances at "Fan 1" terminal (extractor fans)
Number of appliances at "Fan 2" terminal (supply air fans)
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
3 5 7
1 2 3
2 3 4
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