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45
AST 14 C 255/00
IGNITION WITH RAMP OR AT PRE-SET POWER
Boiler ignition mode is selected with parameter P6 (default setting is 0):
P6=0
Ignition with ramp
Upon every operation request entailing burner
ignition, burner will be ignited with a current ramp
to modulation coil changing from the initial to the
final value within 10 seconds. The initial value
corresponds to the minimum current supplied to
the modulation coil (30 mA for LPG and 20 mA
for natural gas), whereas the final value is 80% of
the maximum current (170 mA for LPG and 120
mA for natural gas).
The ignition ramp ends one second after the
flame control has detected the flame.
Flame propagation will now take place if
temperature is below 35 °C, i.e. the modulation
coil will be supplied with current for maximum two
seconds (super-technical parameter P25).
At the end of the flame propagation phase, boiler
will start operating normally and igniter will be cut
out two seconds after flame detection or one
second before TS safety time runs out.
P6
≠
0
Ignition at pre-set and adjustable output
Upon every operation request entailing burner ignition,
burner will be ignited by supplying the modulation coil with
a pre-set current, equal to parameter P6 value. Once flame
is detected, the following flame propagation phase, which
lasts 2 seconds, will be started (super-technical parameter
P25), proceeding then with the modulation output.
Igniter will be cut out two seconds after flame detection or
one second before TS safety time runs out.
80% Pmax
