Phase Monitor (If Installed) - Viessmann Vitocal 350-A AWHO 351.A Series Installation And Service Instructions Manual

Installation sequence
Power supply
(cont.)
X3.7
A
X3.6
3
D
E
≈
3
kWh
3/N F G
4
Fig. 59 Diagram excluding fuses and RCD.
Heat pump control unit (terminals on the cross
A
connect PCB)
Instantaneous heating water heater (accessory)
B
Compressor (fan is directly coupled to the com-
C
pressor power supply)
Power supply, control unit
D

Phase monitor (if installed)

■ The phase monitor monitors the compressor power
supply.
If the internal tolerance range is exceeded or under-
■
shot, the phase monitor interrupts the safety chain
via a floating contact. The compressor stops.
■ The phase monitor automatically re-enables the
compressor power supply if the values return to
within the specified tolerance range. No reset
required.
Note
If the phase monitor has responded, check the power
supply and remove the cause of the fault.
62
C
B
5
3
kWh
3/N
H
4
4
K
E
F
G
H
K
4
Main isolator
High tariff meter
Ripple control receiver (contact open: power-OFF
enabled) with backup fuse
Economy tariff meter
TNC system feed