Emerson 37E37A-903 & 906 Sequence Of Operations, Intelli-Vent Sequence of Operation, 1 OR

SEQUENCE OF OPERATIONS

APPLY POWER TO

APPLIANCE

Intelli-Vent™

Sequence of Operation

	NO	DISPLAY ERROR CODE
IS FIELD WIRING
CORRECT?			1 OR	2
YES
REQUEST	NO
FOR HEAT
PRESENT?
YES
IS	NO	WAIT FOR PRESSURE		IS	NO	WAIT FOR PRESSURE
PRESSURE SWITCH		SWITCH TO OPEN		PRESSURE SWITCH		SWITCH TO OPEN
PROVEN OPEN WITHIN		DISPLAY ERROR		PROVEN OPEN WITHIN		DISPLAY ERROR
5 SECONDS?		NUMBER	3	5 SECONDS?		NUMBER	3
YES				YES
COMBUSTION				COMBUSTION
BLOWER ON
				BLOWER ON				ONE HOUR AUTO
								LOCKOUT RESET
								DELAY
IS	NO	WAIT FOR PRESSURE		IS	NO	WAIT FOR PRESSURE
PRESSURE SWITCH				PRESSURE SWITCH
		SWITCH TO CLOSE				SWITCH TO CLOSE
PROVEN CLOSED				PROVEN CLOSED
		DISPLAY ERROR				DISPLAY ERROR
WITHIN 5				WITHIN 5
		NUMBER	4			NUMBER	4
SECONDS?				SECONDS?
YES				YES
PREPURGE
IS	NO	TURN OFF INDUCER
IGNITOR		DISPLAY ERROR CODE
OKAY?		NUMBER	5
								TURN OFF INDUCER
YES							COMBUSTION	AFTER POST-PURGE	6
								DISPLAY ERROR
							BLOWER OFF

IGNITOR ON FOR
WARM-UP TIME
MAIN VALVE OPENS
YES				INTERPURGE
MAIN
BURNER LIGHTS	NO	LESS		YES
AND IS SENSED
	MAIN VALVE CLOSES	THAN 3 TRIES
DURING TRIAL
FOR		FOR IGNITION?
IGNITION
YES		NO
IGNITOR TURNS OFF
IS	YES	LOST	3	YES
FLAME SENSE	MAIN VALVE CLOSES	LESS THAN
LOST?		TIMES?
NO		NO

NO IS REQUEST FOR HEAT

SATISFIED?

YES

MAIN VALVE OFF

COMBUSTION

BLOWER OFF AFTER

POST-PURGE DELAY

Please Note:

The control continually monitors internal circuits and external sensors. Error codes noted above, and those for self-diagnostic faults can be found on pages 8 and 9.

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