Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 105

Repairs
(cont.)
Temperature sensors type Ni500
640
600
560
520
480
440
400
-40 -20 0
Temperature in °C
Checking MCB/fuses
MCB/fuses in the front wiring chamber,
see page: 54
■ Power circuit MCB/fuse
Compressor 1 and 2 (separate "Con-
nection and wiring diagram" sheet 11/
sheet 12 "11F2"/"12F2"):
Subject to heat pump/compressor out-
put, see chapter "Specification"
■ MCB/fuse, power circuit, system com-
ponents (see separate "Connection
and wiring diagram" sheet 13 "13F2")
16 A
■ MCB/fuse, control circuit (see sepa-
rate "Connection and wiring diagram"
sheet 13 "13F6"):
6.0 A (slow), 250 V~
40
20 60
Temperature sensors, type Pt500
860
780
700
620
540
460
-20 20 60
Temperature in °C
MCB/fuse in the top wiring chamber, see
page: 64
■ MCB/fuse F3 on main PCB:
6.3 A (slow), 250 V~
Max. power loss ≤ 2.5 W
Danger
Contact with 'live' components
can lead to serious injury from
electric current.
Before working on the equip-
ment, always ensure that the
power circuit is also at zero
volt.
Removing fuses does not switch
the power circuit to zero volt.
Troubleshooting
100 140 180
105