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SECTION 3 START SEQUENCE
3. Auxiliary Delay occurs for a configurable length of time and the Delayed Interlocks close.
4. Once all required safety device switches are closed, a purge cycle initiates and:
a. The Blower relay energizes and turns on the blower.
b. The Air/Fuel Valve rotates to the full-open purge position and closes the purge position switch.
The dial on the Air/Fuel Valve will read 100 to indicate that it is full-open (100%).
The Fire Rate bar graph on the Controller's front face shows 100%.
c.
5. Next, the Blower Proof and Blocked Inlet switches close (Figure 3-3). On the Ignition Sequence
screen, the Purging indicator turns grey while purging is underway (Figure 3-4), and Purge Timer
displays the purge cycle's elapsed time in seconds.
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Figure 3-1: SSOV Location (P/N 22490 shown)
Figure 3-2: Air/Fuel Valve in Purge Position
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High Pressure
Gas Switch
Low Pressure
Gas Switch
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