27
Function
Pilot gas valve
E
and external LPG
valve
B
(if installed) open after a heat
demand
A
is issued. The gas pressure
switch
C
(if installed) is switched on.
Gas flows to the pilot burner; at the same
time, ignition
D
is switched on.
The burner control unit receives an ioni-
sation current
F
via the ionisation elec-
trode.
After the pilot burner T4 has stabilised,
main gas valves
G
open and all burner
sections ignite.
Note
A reset after a fault shutdown can only
be implemented after at least 10 s have
elapsed. For this, switch the control unit
ON/OFF switch OFF and ON again.
Ignition system
Time chart and function
(cont.)
5692 704 GB