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APPLY 24V POWER
TO SYSTEM
START
THERMOSTAT
CALLS FOR HEAT
GAS VALVE/IGNITION
CONTROL POWERS
IGNITER CIRCUIT
PILOT VALVE OPENS
PILOT LIGHTS, FLAME
ROD SENSES FLAME
• IGNITER OFF
• MAIN VALVE OPENS
• MAIN BURNER
LIGHTS
• ELECTRONIC FAN
TIMER OUTPUT
ENERGIZES
THERMOSTAT CALL
FOR HEAT ENDS
• MAIN AND PILOT
VALVES CLOSE
• ELECTRONIC FAN
TIMER OUTPUT
DE-ENERGIZES
NO SYSTEM RESPONSE
NO
IGNITER STAYS ON,
PILOT VALVE
REMAINS OPEN
MAIN VALVE
CLOSES
GAS VALVE/IGNITION
CONTROL POWERS
IGNITER CIRCUIT
IGNITION
MAIN
BURNER
OPERATION
END
PILOT AND MAIN
VALVES CLOSE,
SYSTEM SHUTS
DOWN
FLAME SIGNAL
DETECTED
• ELECTRONIC FAN
TIMER OUTPUT
ENERGIZES
• PILOT VALVE AND
IGNITER REMAIN
OFF
SELF-
CHECK
NO
YES
YES
IGNITER
MISSING
OR
BROKEN
FLAME
OUTAGE
OCCURS
DURING
RUN CYCLE
IGNITER
OPENS
Содержание NCC5
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