Viessmann MatriX Service Instructions For Contractors page 34

Flow diagram for burner control unit
Flow diagram for burner control unit
Description of state:
Phase Dis- Description
play
System "A" System start
start
Fan ramp-up, system start
Forced ventilation, system start
Relay test "P" Fan ramp-up for valve test
Safety relay test
Relay/valve test BV 1
Test time BV 1
Relay/valve test BV 2
Test time BV 2
Start-up meter, initialisation
Standby "0" Standby
Start-up "1" Flame amplifier test
Gas fan, air pressure switch and boiler water temperature sensor test
"2" Fan ramp-up
"3" Pre-purge
Adjusting start-up load, WD1 test
"4" Pre-ignition
"5" Safety time
Operation "6" Flame stabilising time
"7" Start-up, partial load
Modulating operation
Adjusting shutdown load
Shutdown "8" Reheating, WD2 test
Fan ramp-up, post-purge
Post-purge
Waiting "U" Waiting for restart
"C" Waiting for mains gas pressure
Fault sta- "9" Forced ventilation fault
tus
"10" Flame tear-off
"11" Safety shutdown
"F" Fault shutdown
34
(cont.)
Duration
10 s
max. 20 s
20 s
max. 20 s
0.9 s
2 s
1.1 s
2 s
1.1 s
0.1 s
0 ... s
max. 50 s
max. 20 s
max. 20 s
30 s
25 s
3.1 s
3.1 s
15 s
2.6 s
0 to 24 h
7 s
0.5 s... 10 s
max. 20 s
10 s
1 min
at least 5 min
20 s
0.5 s
0 ... s
0 ... s