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0006080895 ed 2007/02
TWO-STAGE GAS BURNERS
LME 21... GAS BURNER CONTROL DEVICE
Legend
AL Error message (alarm)
AS Unit fuse
BV... Fuel valve
EK... Remote lockout reset button (inter-
nal)
ION Ionization probe
FS Flame signal
FSV Flame signal amplifi er
GP Gas pressure switch
H
Main switch
K1...5 Internal relays
LP Air pressure switch
LR Load controller
M
Fan motor
NT Power supply
R
Control thermostat / pressurestat
SB Safety limit thermostat
STB Safety limit thermostat
Si
External fuse
t
Time
W
Limit thermostat / pressure switch
Z
Ignition transformer
A
Start command (switching on by «R»)
B-B´ Interval for establishment of fl ame
C
Operating position of burner reached
C-D Burner operation (generation of heat)
D
Controlled shutdown by «R»
• Burner will immediately be shut down
• Burner control will immediately be ready for new
startup
I
Cam I actuator
t1
Prepurge time
t3
Preignition time
t3n Postignition time
t4
Interval between ignition «Off» and release of «BV2»
t10 Specifi ed time for air pressure signal
TSA Ignition safety time
tw
Waiting time
Equipment or
Safety
Preventilation
Pre-
Post
-
Opening time
time travel
time travel
programmer
time
time
ignition
ignition
1st fl ame valve
opening
closing
and the 2nd fl ame valve
damper
damper
s
s
s
s
s
s
s
LME 21.430 A2 BT
3
40
2
2
11
12
12
