Viessmann VITODENS 300 Service Instructions Manual page 68

Service scans
Checking outputs (relay test)
Display
DHW circ. pump ON
Central fault ON
Solar circuit pump ON
Constant temperature control units
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
1
2
3
4
5
6
10
11
12
13
14
68
(cont.)
Explanation
Ext. extension
Ext. extension
Vitosolic
2. Control relay outputs with a and
b.
3. Press d.
Relay test is completed.
Explanation
Burner modulation lower output
Burner modulation upper output
Diverter valve set to heating mode
Valve in central position
Valve set to DHW mode
Internal pump / output 20 ON
Output sK internal extension
Heating circuit pump A1 external extension
Cylinder primary pump external extension
DHW circulation pump external extension
Central fault external extension