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

Temperatures, boiler coding card and brief . . .
Brief scan
E 0: no ex-
ternal de-
mand
1: external
demand
3 0
A 0
4 0
5 0
b 0
C 0
c 0
d 0

Checking outputs (relay test)

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
Intern.pump On
Display screen
0: no exter- External 0 to 10 V hook-up
nal block- Display in °C
ing 0: no external hook-up
1: external
blocking
0 Set boiler water temperature
0 Highest demand temperature
Burner control unit type
0 Set cylinder temperature
0 Max. output in %
Boiler coding card (hexadecimal)
Version
Equipment
0 0
2. a/b
3. d
Explanation
Burner modulation base load
Burner modulation full load
Int. output 20
Service scans
(cont.)
Equipment type
Version
Burner control unit
Software
Variable
speed version
pump variable
0 w/o speed pump
1 Wilo 0: no vari-
2 Grundfos able speed
pump
for the required relay out-
put.
Relay test is completed.
65