Scanning Operating Conditions And Sensors - Viessmann VITODENS 200-W Service Instructions Manual

Service scans
Checking outputs (relay test)
Display screen
Mixer OPEN
Mixer CLOSE
Output int. ON
Heating circuit pump
A1 ON
Cylinder pump ON
DHW circ. pump ON
Central fault ON
Constant temperature 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
1
2
3
10
11
12
14

Scanning operating conditions and sensors

Weather-compensated control unit
Press the following keys:
1. c "Select heating circuit" is
displayed.
2. d to confirm; wait approx.
4 s.
66
(cont.)
Explanation
Mixer extension
Mixer extension
Output sK internal extension
External extension H1
External extension H1
External extension H1
External extension H1
2. a/b
3. d
Explanation
Burner modulation base load
Burner modulation full load
Internal pump / output 20 "ON"
Output sK internal extension
Heating circuit pump A1 External extension H1
Cylinder primary pump External extension H1
Central fault message External extension H1
3. c
4. a/b for the required operating
5. d
for the required relay out-
put.
Relay test is completed.
press again.
condition.
Scanning is completed.