53
Power supply with power-OFF without on-site load disconnect (delivered condition)
The power-OFF signal is connected directly to the heat
pump control unit via floating contact. The compres-
sors are shut down when power-OFF is enabled.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
Mains monitor
Electronic soft starter, type SMC
Electronic soft starter functions:
■
Monitoring the compressor mains feed
■
Reducing the compressor starting current during the
starting procedure
Delivered condition:
■
Rotating field, phase asymmetry: 20 %
■
Max. compressor operating current "Imax": Subject
to compressor output
Overload protection
If the tolerance ranges of the electronic soft starter are
exceeded, the soft starter will automatically separate
the appliance from the mains.
Remove the cause if the relay has responded. The
relay does not need to be reset.
Starting characteristics
The starting characteristics are set at the DIP switches
behind the transparent protective flap of the electronic
soft starter. At the factory, the DIP switches are set to
suit the respective heat pump type.
Prior to commissioning, compare the DIP switch set-
tings with the details in the separate "Connection and
wiring diagram", and adjust if necessary.
LED explanation
HOLD TO TEST
PUSH TO RESET
SMC-3
OVLD SETTING
LED STATUS
ON RUN/ON
RUN/FAULT
A1 A2 IN1 IN2 97 98 13 14
1 OLVD
2 TEMP
3 PHASE REVERSAL
4 PHASE LOSS/OPEN LOAD
5 PHASE IMBALANCE
6 SHORTED SCR
7 TEST
L1
L2
L3
T1
T2
T3
Fig. 32
Installation procedure, heat pump
Power supply
(cont.)
5837251
Installation
