Viessmann VITODENS 111-W Installation And Service Instructions Manual page 30

Commissioning, inspection, maintenance
Further details regarding the individual steps
r r
30
2. Turn both rotary selectors "tw" and
r
3. Within 2 s, turn rotary selector "tr"
4. Adjust the control unit to stage 1 or
5. The set operating mode is saved
(cont.)
"tr" simultaneously into their
respective central positions.
"SERV" appears on the display.
to the top right range.
"r" is displayed and the set value
flashes.
2 by turning rotary selector "tw".
The display shows:
■ "1" for operation with stage 1
or
■ "2" for operation with stage 2.
when the value stops flashing, and
the control unit returns to standard
mode.