Temperature Sensors, Type Pt500A; Checking Mcbs/Fuses - Viessmann Vitocal 300-G Pro Installation And Service Instructions For Contractors

Repairs
Checking sensors

Temperature sensors, type Pt500A

600
580
560
540
520
500
480
460
440
420
400
-40 -30 -20 -10
Outside temperature in °C
Fig. 38

Checking MCBs/fuses

Danger
Contact with live components can lead to seri-
ous injury from electric current.
Before working on the appliance, ensure that
the power circuit is at zero volt.
Removing fuses/MCBs does not switch the
power circuit to zero volt.
For fuses in the front wiring chamber, see page 32 and
page 31.
Power circuit MCB/fuse, compressor 1 and 2 (see
■
separate connection and wiring diagram):
Subject to heat pump/compressor output, see chap-
ter "Specification".
■ Power circuit MCB/fuse, system components (see
separate "Connection and wiring diagram"):
16 A
MCB/fuse, control circuit (see separate connection
■
and wiring diagram):
6.0 A (slow), 250 V~
MCB/fuse in the top wiring chamber, see page 39.
MCB/fuse F3 on main PCB:
■
6.3 A (slow), 250 V~
Max. power loss 2.5 W
≤
66
(cont.)
0 10 20 30 40