Power Supply With Power-Off; Electronic Soft Starter, Type Smc - Viessmann Vitocal 300-G Pro Installation And Service Instructions For Contractors

Power supply
(cont.)

Power supply with power-OFF

Power-OFF without on-site load disconnection (delivered condition)
The power-OFF signal is connected directly to the heat
pump control unit via floating contact. The compres-
sors are "forced off" when power-OFF is enabled.
Parameter "Output for instant. heating water heater
at power-OFF 790A" determines whether and at what
stage an instantaneous heating water heater (if instal-
led) remains operational during power-OFF.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.

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. operating current of "Imax" compressor:
dependent on 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.
X3.7
A
X3.6
3
D
3
G
kWh
E
3/N
F
4
Fig. 29 Diagram excluding MCB/fuses and RCD
Heat pump control unit
A
B Instantaneous heating water heater
Compressor
C
Heat pump control unit power supply
D
Premium tariff meter
E
Backup fuse, ripple control receiver
F
Ripple control receiver (contact open: power-OFF
G
enabled) TNC system feed
Economy tariff meter
H
K Feed in: TNC system
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.
Installation sequence
B C
5
3
kWh
3/N
H
4
4
K
4
47