Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 86

Maintenance
Overview of internal components: Outdoor unit
Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
When working on the outdoor unit, isolate the
■
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
■ Prior to working on the appliance, wait at least
4 min until the voltage on the charged capaci-
tors has completely dropped out.
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