Sequence Of Operation - State Water Heaters GP650 HTPDT Service Handbook

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

SEQUENCE OF OPERATION

Air Pressure Switch Test Is Performed
Blower Prover Switch is verified open
Blocked Intake and Blocked Exhaust Switches are verified closed
Blower Prover Switch is verified closed
Igniter is energized for warm up period
Control System (CCB) Verifies Igniter
Control System (CCB) Verifies Flame
Sensing Current at 1.0µA DC Micro Amps Minimum
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
Technical Literature Department
Call for heat initiated
YES
Blower Motor is energized
Pre-purge State
YES
(approx 17 seconds)
Current at 2.0 AC Amps Minimum
YES
Gas Valve Is Energized
Gas Flows To Burner
YES
Servicing should only be performed by a Qualified Service Agent
NO
NO
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
40 of 52
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
Ashland City, TN © 2008