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4.3. Blower control board: logic operation
The logic of the Blower control board and Combustion control board offers several steps:
there are 11 steps as reported in the table below and each one of these corresponds to a
check / audit and controls to the blower and to the gas.
STEP Blower fan
Blower fan
speed
Gas valve
Description
0 OFF 0 OFF STANDBY: ignition not required
1 OFF 0 OFF
CONTROL: : ignition required, check blower fan speed
(lower than 500 rpm). As soon as the check is finished
it pass to step 2, other wise after 20” appears the
GAS:F24.
2 ON Ignition speed
OFF
START: blower fan start and the ignition speed has
been checked. As soon as the check is finished it pass
to step 3, other wise after 30” appears the alarm
GAS:F24.
3 ON Ignition speed
OFF
PURGING: the blower fan runs at the ignition speed,
then if there are no alarms, then pass to step 4.
4 ON Ignition speed
OFF/ON
IGNITION: The Blower control pcb set the Burner
Control Board to start phase. After a wait of 7 sec. at
the blower purging speed, then the Burner control pcb
opens Gas Valve and spread out the spark. If the
sensor recognize the flame then the Burner Control
pcb feedback it to Blower Control pcb, and STEP 5 is
selected.
Otherwise recycle: 7secs/3secs
7sec.Gas+Spark=OFF + 3sec.Gas+Spark =ON.
The max number of ignition attempts are 3.
If No flame was detected, then STEP 10 (postpurge) is
selected before set 6 and 7 and 8 Steps.
5 ON Target speed ON
WORKING: ignition done successfully. Blower Control
pcb set up required the blower speed and the power of
the burner. This step will remain until the power is
requestd and/or until an alarm occurs, then step 10 is
selected.
6 OFF 0 OFF
STOP: burner turned off. The blower is set to stop. The
blower control check for alarm from Burner Control
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