Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 152

Outdoor unit maintenance
Checking the pressure sensors
5
A
4
3
2
1
0
0
MPa
0
bar
Pressure
Fig. 91
Low pressure sensor
A
High pressure sensor
B
Checking the fuses
The fuses are located next to the VCMU refrigerant cir-
cuit controller: See page 136.
Fuse type:
6.3 A H (slow), 250 V~
■
Max. power loss 2.5 W
■
≤
Danger
Removing fuses 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.
152
1 2
10 20
B
3
30
1. Switch off the power supply.
2. Remove right-hand side panel of the outdoor unit.
3. Check the fuse. Replace if required.
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
■ Insert fuses without using any force. Posi-
tion fuses correctly.
Only use structurally identical types with
■
the same response characteristics.