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POWER SUPPLY
8.4.3
EXTERNAL CONNECTIONS – HWDU-151
Fig. 27 External connections – HWDU-151
POWER SUPPLY
Connect the power cable to terminals L1, N and PE
(
chapter 8.4). Ensure connection to the same phase
sequence as the heat pump.
OUTSIDE TEMPERATURE SENSOR (T2)
Connect the outside temperature sensor to terminals
Ai2 and GND.
ROOM TEMPERATURE SENSOR (T5)
If you want to influence the temperature via a room
temperature sensor (accessory), connect the sensor to
terminals Ai4 and GND.
CAN-BUS
Connect the screened communication cable between
the internal unit and the heat pump to terminals GND,
CANL, CANH and 12V (
chapter 5.8).
CAUTION: Do not mix up the 12V and CAN-
BUS connections!
The processors are destroyed if 12V is
connected to the CAN-BUS.
B Check that the four cables are connected
to the contacts with the corresponding
marking on the circuit board.
26
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