GAS BURNER SAFETY CONTROL
Description
HS
Mains switch
GW
Gas proving switch
ST
Limit thermostat
RT
Control thermostat
EV
External reset and lock out button
IS
Ionisation probe
(IRD 1010, UVD 971 see separate diagram)
Z
Ignition
M
Burner motor
V1
Solenoid valve, 1st-stage
Mod.
max. reaction time for
air proving switch
tlw
03
03
60
ONE STAGE NATURAL GAS BURNERS
CIRCUIT AND TIMING DIAGRAM DLG 976
Supervised
Pre-ignition time
pre-purge time
tv1
tvz
40,5
1
43 / 87
0006080876 ed 2007/02
V2
Solenoid valve, 2nd-stage
LW
Air proving switch
SA
External lock out signal
tlw
max. reaction time for air proving switch
tv1
Supervised pre-purge time
tf
Stray light monitoring
tvz
Pre-ignition time
tn
Post-ignition time
ts
Safety time
tv2
Delay 2nd-stage
Post-ignition time
Stray light
monitoring
tn
tf
2,5
5
Safety time
Delay 2
-stage
nd
ts
tv2
2,8
10.2