Viessmann Vitoplus 300 Service Instructions Manual page 64

Service scans
Checking outputs (relay test)
1. Press K and d simultaneously
for approx. 2 s.
Relay test is activated.
Subject to the actual equipment level, the following relay outputs can be con-
trolled:
Display
Burner st 1 ON
Burner st 1 + 2 ON
Heating valve
Valve central pos.
DHW valve
Int. pump ON
Mixer CLOSE
Mixer OPEN
Ht. circ. pump M2 ON
Output int.
Heat. circ. pump A1 ON
Cylinder pump ON
DHW circ. pump ON
Central fault ON
Solar circuit pump ON
Scanning operating conditions and sensors
1. In case of two heating circuits
select the relevant one:
Press.
"1r" flashes on the display.
Select heating circuit A1 (heating
circuit without mixer):
Press.
Select heating circuit with mixer
M2:
Press.
"2r" flashes on the display.
Press d.
64
2. Control relay outputs with a and
b.
3. Press d.
Relay test is completed.
Explanation
Burner stage 1
Burner stage 2
Diverter valve set to heating mode
Diverter valve in central position (filling)
Diverter valve set to DHW mode
Int. pump/output 20 ON
Mixer extension
Mixer extension
Mixer extension
Internal extension
Ext. extension
Ext. extension
Ext. extension
Ext. extension
Vitosolic
2. Press c.
3. Select the required operating con-
dition scan with a or b.
4. Press c.