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12/22
Building Technologies
HVAC Products
Postignition time
t3n
Ignition time during «TSA»
Just before reaching the end of «TSA», ignition transformer «Z» will be
switched off.
This means that «t3n» is somewhat shorter than «TSA».
This is necessary in order to give the forcedly closed flame relay «FR» suffi-
cient time to drop out if there is no flame.
t4
Interval
LGB21... / LGB41...: Time to the release of the second fuel valve «BV2»
LGB22... / LGB32...: On completion of «t4», the heat source is controlled
depending on the load (release of load controller «LR»)
t9
Second safety time
(Only with LGB41...)
For pilot burners with main flame supervision equipped with a pilot gas valve
«ZV1».
t10
Specified time for air pressure signal
On completion of this period of time, the set air pressure must have built up, or
else lockout will occur.
Programmed opening time for actuator «SA»
t11
(Only with LGB22... / LGB32...)
The air damper opens until the nominal load position is reached. Only then will
fan motor «M» be switched on.
t12
Programmed closing time for actuator «SA»
(Only with LGB22... / LGB32...)
During «t12», the air damper travels to the low-fire position.
B – B´
Interval for establishment of flame
Burner operating position reached
C
C – D
Burner operation (generation of heat)
Nominal output or, in connection with a load controller «LR», part load opera-
tion.
D
Shutdown by «R»
The burner is immediately shut down and the programming mechanism is
ready for a new start.
CC1N7435en
11.01.2007
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