Checking Outputs (Relay Test) - Viessmann Vitodens 300 Service Instructions Manual

Service scans
Temperatures, boiler coding card and brief scans
Display screen
Brief scan
d

Checking outputs (relay test)

Weather-compensated control units
1. Press K and d simultaneously
for approx. 2 seconds.
Relay test enabled.
Subject to the actual equipment level, the following relay outputs can be con-
trolled:
Display
Basic load
Full load
Heating valve
Valve central pos.
DHW valve
Int. pump ON
Close mixer
Open mixer
Heating circ. pump M2 ON
Output int.
Heating circ. pump A1 ON
Cylinder loading pump ON
DHW circ. pump ON
Central fault display ON
68
2. Select the relay outputs with a
and b.
3. Press d.
Relay test is completed.
Description
Burner modulation lower output
Burner modulation upper output
Diverter valve set to heating mode
Changeover valve in central position (fill)
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
(cont.)
Variable Software
speed version
pump Variable
0: excl. speed pump
1: Wilo
2: Grund-
fos