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36
UK
M
TW
Begins with the closure of the thermostatic line or the PG. The PA must be in the rest position.
This is the waiting and self-test time lasting for 2,5 seconds.
T10
Begins when the motor starts up and withthe pre-purge phase; it lasts for 5 seconds,within which
the PA air pressure switchmust give the go-ahead.
T1
Pre-purge time, which lasts for at least 30 seconds, ending when the transformer starts up.
T3
Pre-ignition phase, it ends when the gas valve opens, and it lasts for 2 seconds.
T2
Safety time, within which the flame signal must reach the EC electrode; it lasts for 3 seconds.
Necessary input signals
Output signals
A
Begin start up
B
Flame present
B-C
Operation
C
Control stop
C-D
Air gate c post-purge
TC-PG
Thermostats/Gas pressure
switch line
MB
Burner motor
PA
Air pressure switch
TR
Ignition transformer
V
Gas valve
EC
Control electrode
OPERATING CYCLE
Содержание EM 16-E
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