Sears 9MPD100J14B1, N9MP2050B12B1 manual Honeywell SV9541M Smart Valve Sequence of Operation

HONEYWELL SV9541M "SMART VALVE" Sequence of Operation

	I POWERAPPLIEDTO APPUANCE	l
I THERMOSTAT CALLS FOR HEAT		I
	¢		WAITFOR PRESSURESWITCHESTO OPEN
I	PRESSURESWITCHESPROVEDOPEN?
i
I	COMBUSTIONBLOWER ENERGIZED
I
	PRESSURESWITCHESCLOSEDWITHIN30 SEC-		COMBUSTIONBLOWERDE- ENERGIZED
	ONDS?	_1_		_[	FIVE MINUTEWAIT PERIOD
	3SECONDPRE-PURGE
	PILOTVALVEOPENS:		I
	IGNITORPOWERED(1)		L THREEFAILURESECONDRECYCLEFLAMEDELAY
	PILOT LIGHTSAND FLAMEIS SENSED	I_uI	PILOTVALVECLOSES;
	DURING90 SECONDTRAILFOR		PILOTIGNITOROFF
	IGNITION?

J

_I YES

MAIN VALVE OPENS,

HEATING FAN "ON" DELAY BEGINS

AFTERDELAY:CIRCULATINGBLOWER STARTS	I
	I

YES

		I CIRCULATINGBLOWER OFF AFTER DELAY	I
FLAME SENSE LOST?		+
	.[ PILOT AND MAIN VALVECLOSE
THERMOSTAT CALL FOR HEAT ENDS	FLAME SENSE LOST MORE THAN FIVE	I
		COMBUSTIONAIR BLOWER OFF AFTERPOST
	TIMES INTHISCALL FOR HEAT?	J--PURGE

_ NO

I P,LOTANDMAINVALVECLOSE I

NO

YES

COMBUSTIONBLOWER DE- ENERGIZEDAFTER 30

SECONDPOST PURGE

(1)Ignitor "ON" for first 30 seconds of trial for ignition,then "OFF" for next 30 seconds. If the pilot has not lit, it turns back"ON" for the final 30seconds. The pilot valve remains energizedduring the entire 90 second trial for ignition.

NOTE: If main limit string opensandtakes longerthan 2 minutesto close, system goes intoI hour wait period.

ICIRCHLATBLOWEROFFNGAFTERDELAY I

/ WAFORNEXTCALLFOR.HEAT I

L l

440O1102004 [_