State Industries GP650HTPDT, SHE50-100PE, SHE50-100NE manual Sequence of Operation, Yes

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL

SEQUENCE OF OPERATION

Call for heat initiated

Air Pressure Switch Test Is Performed Blower Prover Switch is verified open

Blocked Intake and Blocked Exhaust Switches are verified closed

YES

Blower Motor is energized

Pre-purge State

	Blower Prover Switch is verified closed
					NO
			YES
	Igniter is energized for warm up period
		(approx 17 seconds)
	Control System (CCB) Verifies Igniter
				NO
	Current at 2.0 AC Amps Minimum
			YES
		Gas Valve Is Energized
		Gas Flows To Burner
	Control System (CCB) Verifies Flame
Sensing Current at 1.0µA DC Micro Amps Minimum

	Control System Declares
	Fault Condition - Locks Out
	One of the following
	Fault Messages Displayed:
NO
	“Blower Prover Failure”
	“Blocked Inlet”
	“Blocked Exhaust Vent”
	Control System Declares
	Fault Condition - Locks Out
	“Blower Prover Open”
	Fault Message Displayed

Control System Declares

Fault Condition - Locks Out

“Low Igniter Current”

Fault Message Displayed

YES

Water Is Heated To

Operating Set Point

Gas Valve Is

De-energized

Post-Purge State

30 Sec Approx

Control System Goes Into

Standby State/Mode

NO

Gas Valve Is

De-energized

Inter-Purge State

30 Sec Approx

Retries Up To

3 Times

Control System Declares Fault Condition - Locks Out

“Ignition Failure”

Fault Message Displayed

Technical Literature Department	40 of 52	Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent