Viessmann MatriX radiant burner, Service Instructions Manual

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33
Gas burner control unit flow chart
Gas burner control unit flow chart
(cont.)
After the controller issues a heat demand, the following program sequence
will be run:
Phase Duration
01 Test for heat demand 1s
02 Idle state check of the air pressure switch 1 to 30s
and the fan
03 Fan ramp up 1 to 30s
(a fault shutdown will be initiated, if the air pressure switch
does not signal that the air pressure has reached
a defined range within this time scale,
or the fan does not reach its set speed)
04 Pre−purgeI 5s
05 Pre−purgeII 1s
06 Pre−purgeIII 30s
07 Ignition position 1 to 30s
(the burner control unit will enter a fault state,
if the fan does not reach its set speed)
08 Pre−ignition 2s
09 Start−up safety time (safety timeA) 2.8s
(enable safety valves at the start of the safety timeA,
safety timeoperation <1s)
10 Flame stabilisation in ignition position 20s
11 Changeover to control operation 1 to 30s
(ramp up to the set speed programmed in the controller)
12 Operation max. 23:59h
(the system will be restarted after expiry of this time)
13 Burner run−on time max. 30s
17 Post−purge 1 to 60s
18 Restart lockout time 0s
19 Gas shortage position max. 30min
20 Standby max. 23:59h
(a restart follows a heat demand, and the system
will be restarted after expiry of this time)
in case of fault shutdown from phase09:
21 Fan run−on prior to lockout
5s
5692541 GB