Appendix; Function Of The Ignition Burner System; Time Chart - Viessmann Vitogas 100 Service Instructions Manual

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

Time chart

Heat demand
Ignition
Pilot gas valve
External valve
(accessory
LPG version)
Ionisation signal
Main gas valve
Flue gas
monitor
Fault display
T Pilot flame stabilisation time
stab
T Safety time operation
FR
T Self−monitoring time
c
T Waiting time
w
PV
LPG
MV
6s
T
stab
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 10 seconds.
max.
<1s 6s
25s
T T + T T
FR C W stab
T Shutdown duration, flue gas
TTB
monitoring
T Safety time, burner start
s

Appendix

approx. max. max.
15 min.
25s 55s
T T +T T
TTB c w S
17