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INTERMITTENT PILOT INSTRUCTIONS Continued
START
STAGE 1
TRAIL FOR
IGNITION
STAGE 2
MAIN
BURNER
OPERATION
END
Part # 1382670 (12/07)
SEQUENCE OF OPERATION
1
THERMOSTAT (CONTROLLER)
CALLS FOR HEAT
SAFE-START CHECK
2
MUST NOT BE ANY FLAME OR
FLAME SIMULATING CONDITION
SPARK GENERATOR POWERED
3
FIRST VALVE (PILOT)
OPERATOR OPENS
4
PILOT BURNER LIGHTS
S86 SENSES FLAME CURRENT
IF FLAME CURRENT SENSED
5
SPARK GENERATOR OFF.
SECOND VALVE OPERATOR
(MAIN) OPENS
MAIN BURNER OPERATION
6
S86 MONITORS PILOT FLAME
CURRENT
7
THERMOSTAT (CONTROLLER)
SATISFIED - VALVES CLOSED
PILOT AND MAIN BURNERS
ARE OFF.
SYSTEM SHUTS OFF, RESTARTS WHEN
SECOND MAIL OPERATOR CLOSES,
S86 STARTS TRAIL FOR IGNITION
IF FLAME OR FLAME SIMULATION
CONDITION PRESENT SYSTEM
FAILS TO START
PILOT BURNER OPERATION
PILOT BURNER DOES NOT LIGHT
OR
S86A OR B - TRIAL FOR IGNITION
CONTINUES, S86C OR D - GOES
INTO LOCKOUT AFTER TRIAL FOR
IGNITION TIMES OUT.
POWER INTERRUPTION
POWER IS RESTORED.
PILOT FLAME FAILURE
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