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UK
Necessary input signals
Output signals
A Begin start up
B Flame present
B-C Operation
C Control stop
C-D Air shutter closure + 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
M
T11 Air shutter opening time, from 0 to max
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.
T10 Begins when the motor starts up and with the pre-purge phase; it lasts for 3 seconds, within which
the PA air pressure switch must 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. It lasts for 3 seconds.
T2 Safety time, within which the ame signal must reach the EC electrode. It lasts for 3 seconds.
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