Burner Control Unit Connection Diagram - Viessmann Vitocrossal 300 Service Instructions Manual
Gas fired condensing boiler with matrix−compact gas burner, for open flue and balanced flue operation
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Also See for Vitocrossal 300:
- Service instructions manual (164 pages) ,
- Service instructions for contractors (148 pages) ,
- Service manual (108 pages)
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Burner
Burner control unit connection diagram
PE
Y1
M1
M
T1
4
B2
B3
F6 P
Legend
A 1 Burner control unit MPA 51
A 2 Display unit with reset function
H 1 Operating message B 4
H 2 Fault message S 3
B 1 Flame monitoring through
ionisation current
B 2 Strapping plug
B 3 Strapping plug
40
Y1
PE
N
Y2
PE
N
Fan
PE
N
Ign.
PE
N
NO
PE
COM
NO
PE
COM
NO
PE
COM
NO
COM
A1
GND
Spd.
PWM
+UH
ION
A2
F 1 Main fuse
F 6 Air pressure switch
M 1 Fan motor with PWM selection
and feedback
S 1 ON/OFF switch
S 2 Thermostat
S 3 Output control
T 1 Ignition transformer
Y 1 Gas safety valve
H1
N
H2
N
S2
N
Mains
230 V~
PE
S1
50 Hz
F1
F1
L1
(+)
S3
(−)
4
M1
B1
S4
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