State Industries SUF100199, SUF100150 manual Control Sequence Flow Chart

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROL SEQUENCE FLOW CHART

	Power on
	Control displays
	model,
	temperature
	setting and
	status
If checks are not	The control	If all checks are
	performs internal	passed and there is
passed the
	system checks	a call for heat the
control will
	and determines	blower is energized
display an error
	tank temperature	for a pre purge
or warning .
	is below set point	cycle
The control will		When the pre
store an error		purge is complete
history to show		power is applied to
what fault occurred		the igniter for
and the time		Warm-up.
elapsed since the
fault.		At the conclusion
		of the igniter
		warm up the gas
		valve will open for
		4 seconds.
		If the control
		senses flame the
		water heater will
		fire until the set
		point is reached .
		At the conclusion
		of the heating
		cycle the blower
		will enter a post
		purge cycle and
		the control will
		enter an idle state .

If the control fails to see flame the blower will continue to run for a 30 second Inter purge . There will be 3 trials for ignition before a fault is declared .

At the conclusion of the inter purge the igniter will warm and the gas valve will open.

State Water Heaters – Technical Training Department 21 Ashland City, Tennessee © 2009

Servicing should only be performed by a Qualified Service Agent 198152-002