Viessmann Vitodens 333-F Service Instructions Manual page 72

Service scans
Checking outputs (relay test)
Display screen
4
5
6
10
11
14
Weather-compensated control unit
Press the following keys:
1. K + d simultaneously for
approx. 2 s.
The following relay outputs can be controlled subject to system design:
Display screen
Base load
Full load
Int. pump ON
Heating valve
Valve central position
DHW valve
Heating circuit pump
M2 On
Mixer OPEN
Mixer CLOSE
Output int. ON
Heating circuit pump
A1 ON
Central fault ON
72
(cont.)
Explanation
Diverter valve set to heating mode
Diverter valve in central position (filling/draining)
Diverter valve set to DHW mode
Output sK internal extension
Heating circuit pump A1 External extension H1
Central fault message External extension H1
2. a/b
3. d
Explanation
Burner modulation base load
Burner modulation full load
Int. output 20
Diverter valve set to heating mode
Diverter valve in central position (filling/draining)
Diverter valve set to DHW mode
Mixer extension
Mixer extension
Mixer extension
Output sK internal extension
External extension H1
External extension H1
for the required relay out-
put.
Relay test is completed.