Checking Outputs (Relay Test) - Viessmann FB2A Installation And Service Instructions For Contractors

Diagnosis
(cont.)
Line (brief
scan)
1
Boiler
7: 0
Internal circulation
pump
8: 0

Checking outputs (relay test)

1. Press OK and å simultaneously
for approx. 4 s.
The following relay outputs can be controlled subject to system design:
Display
Base load
Full load
Internal pump ON
Htg. system valve
Valve Centre
Valve Cylinder
Heating circ pump M2
ON
Mix.valve open
Mix.valve closed
2 3
Heating circuit A1
(without mixer)
0 Remote
control
0 w/o
1 Vitotrol
200
2 Vitotrol
300
Heating circuit pump to connection exten-
sion
0 Variable
speed
pump
0 w/o
1 Wilo
2 Grund-
fos
2. "Actuator test"
Explanation
Burner modulation base load
Burner modulation full load
Int. output 20
Diverter valve set to heating mode
Diverter valve in central position (filling/draining)
Diverter valve set to DHW mode
Extension heating circuit with mixer
Extension heating circuit with mixer
Extension heating circuit with mixer
Diagnosis and service scans
Field
4 5
Heating circuit with
mixer M2
Software Remote
version control
Remote 0 w/o
control 1 Vitotrol
0: no 200
remote 2 Vitotrol
control 300
Software Variable
version speed
Variable pump
speed 0 w/o
pump 1 Wilo
0: no vari- 2 Grund-
able fos
speed
pump
6
Software
version
Remote
control
0: no
remote con-
trol
Software
version
Variable
speed
pump
0: no varia-
ble speed
pump
83