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0006080895 ed 2007/02
TWO-STAGE GAS BURNERS
GAS BURNER SAFETY CONTROL
CIRCUIT AND TIMING DIAGRAM DLG 976
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, 1
st
-stage
Tempo di reazione max.
per interr. contr. aria
tlw
60
V2 Solenoid valve, 2
nd
-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 2
nd
-stage
Mod.
03
03
Supervised
pre-purge time
tv1
40,5
Pre-ignition time
tvz
1
Post-ignition time
tn
2,5
Stray light
monitoring
tf
5
Safety time
ts
2,8
Delay 2
nd
-stage
tv2
10.2
