Viessmann GS1, Service Instructions Manual

Page: 17 / 36

17
Appendix
Function of the ignition burner system
Power is supplied to the burner
control unit when there is a heat
demand, and the LED on top of the
equipment illuminates. The pilot gas
valve and, if installed, the external
LPG valve open.
Gas flows from the pilot burner. At
the same time, the HV ignition is
switched ON.
After the burner control unit has
received a flame signal via the
ionisation electrode,
the green LED
on top of the equipment illuminates.
After the pilot flame has stabilised,
the main gas valve opens and the
burner ignites.
Note
A reset after a fault shutdown can
only be implemented after a
minimum of 10seconds.
Time chart
T
stab
Pilot flame stabilisation time
T
FR
Safety time operation
T
c
Self−monitoring time
T
w
Waiting time
T
TTB
Shutdown duration, flue gas
monitoring
T
s
Safety time, burner start
5692413GB
Heat demand
Ignition
Pilot gas valve
External valve
Ionisation signal
Main gas valve
Flue gas
monitor
Fault display
(accessory
LPG version)
PV
LPG
6s
T
stab
<1s
T
FR
max.
25s
T
C
+T
W
6s
T
stab
approx.
T
TTB
max.
25s
T
c
+T
w
max.
55s
T
S
MV
15 min.