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E.
When the 20 second purge time is complete, the circuit board will
switch +12 VDC to the ungrounded terminal of the gas valve and the
gas valve will open.
The circuit board will simultaneously initiate the
igniter spark through the large orange wire to the igniter electrode,
then ignition will occur.
See Fig. 9.
F.
When
the
gas
valve
is
energized
and
the
ignition
spark
occurs,
(Paragraph E) the circuit board will start the 6 to 9 seconds waiting
time to prove the presence of a flame.
When the flame is established
above the burner in less than 6 to 9 seconds, the flame sensor will
detect the flame and signal (through the black wire to terminal #5)
circuit board to continue the heating cycle.
Note:
If the flame sensor does not detect a flame, the flame sensor
will signal the circuit board to lock-out the gas valve.
1-15
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