Viessmann Pt500A (Green Marking); Checking The Fuses - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Maintenance
Checking the sensors

Viessmann Pt500A (green marking)

860
780
700
620
540
460
-20 20 60
Temperature in °C
Fig. 50

Checking the fuses

For fuse locations, see page 23 onwards.
Fuse F1 is located on the mains terminal of the heat
■
pump control unit.
Fuse F3 is located on the main PCB.
■
Danger
Removing the fuse does not switch the power
circuit to zero volt. Contact with 'live' compo-
nents can lead to serious injury from electric cur-
rent.
Before working on the equipment, always
ensure that the power circuit is also at zero
volt.
58
(cont.)
100 140 180
Fuses F1 and F3:
6.3 A (slow), 250 V~
■
Max. power loss 2.5 W
■
≤