Viessmann Vitocal 242-S Installation And Service Instructions Manual page 98

Troubleshooting
Repairs
(cont.)
Cylinder drain & fill valve positions
A Closed
B Open for draining internal DHW
line
Overview of internal components: External unit
Danger
Contact with 'live' components
can result in severe injuries.
Capacitors remain 'live' after the
power supply has been switched
OFF.
Wait at least 4 min, until the
capacitors have discharged,
before starting work on the exter-
nal unit.
98
C Open for draining or filling the cylin-
der
A
B
C