OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 35 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 4: START SEQUENCE
Figure 4-1: SSOV Location
3. The Auxiliary Delay occurs for a configurable length of time and the Delayed Interlocks
are closed.
4. Once all required safety device switches are closed, a purge cycle is initiated, and the
following events occur:
a. The Blower relay energizes and turns on the blower.
b. The Air/Fuel Valve rotates to the full-open purge position and closes purge
position switch. The dial on the Air/Fuel Valve (Figure 4.2-2) will read 100 to
indicate that it is full-open (100%).
c.
The Fire Rate bar graph on the Controller’s front face shows 100%.
5. Next, the Blower Proof and Blocked Inlet switches close.
Figure 4-2: Air/Fuel Valve in Purge Position
MANUAL
SHUT-OFF
VALVE
LOW GAS
PRESSURE
SWITCH
HIGH GAS
PRESSURE
SWITCH
SSOV
TO BLOWER
STEPPER
MOTOR
AIR IN
PURGE
VALVE POSITION
DIAL AT 100%
