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SECTION 3 START SEQUENCE
Figure 3-3: Blower Proof Switch and Blocked Inlet Switch
Figure 3-4: Ignition Sequence Screen – Purging
6. Upon completion of the purge cycle, the Controller initiates an ignition cycle, and the following
events occur:
a)
he Air/Fuel Valve rotates to the low-fire (Ignition) position and closes the ignition switch. The
T
Dial on the Air/Fuel Valve will read between 25 and 35 to indicate that the valve is in the low fire
position.
b) The Spark Cleaning cycle begins (default duration = 7 sec.) and the Ignition Sequence screen's
Spark Cleaning indicator (Figure 3-3) turns grey. This cycle turns on the ignition transformer to
produce a spark (with no gas flowing) to remove moisture and carbon buildup from the spark
element. For the duration of this cycle, the Controller displays the Cleaning Igniter status
message.
c) Following the Spark Cleaning cycle, power is applied to the gas Safety Shut-off Valve (SSOV). When
the SSOV indicates the Gas Valve is OPEN (POC) and the Ignition Sequence screen's Ignition
indicator (Figure 3-3) turns grey.
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