Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 94

Maintenance
Checking the fuses
1. Switch OFF the power supply.
2. Opening the wiring chamber.
3. Check fuses. Replace if necessary.
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 specified response characteristics.
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.
94
(cont.)