American Water Heater (A)BCG385T500-8N Operating Sequence - Flow Chart, Operation And Service

OPERATION AND SERVICE

OPERATING SEQUENCE - FLOW CHART

					Power On
					Call for Heat
											Control Locks Out - LED
			Self diagnostic check is performed
											Displays 2, 6, or 8
(Correct state of Blower Prover Switch and ECO is verified)									NO
											Flash Error Code
(polarity, earth ground , and Igniter presence are verified )
											(See Error Code Chart )
						YES
					Blower (Draft Inducer)
					Motor is Energized
											Control Locks Out
	Blower Prover Switch (N.O.) Contacts
								NO			Displays 3 Flash
		Close at – 2.85“ W.C. ± 0.13” W.C.
											Error Code
						YES
					Ignition Control Board
			Sends Voltage (80-120 VAC)
			to Igniter for 17-20 Seconds.
			Ignition Control Board Energizes							Below 0.1 uA DC Flame Sense:
					Gas Valve (24 VAC)					Heater Will Try to Ignite 3 Times
	Igniter De-energized After 3 Seconds									Control De-energizes Gas Valve
										Blower Runs for Post Purge Period
										Control Locks Out for 1 Hour
										Displays 1 Flash Error Code
			Ignition Control Board Waits 3
			More Seconds For “Strong” Flame				NO
			Sense Signal (2.0 uA DC or more)
										Between 2.0 and 0.1 uA DC Flame Sense
										Heater Will Continue to Operate
						YES				Displays 7 Flash Error Code
										(Weak Flame Sense)
				Tank Heated to Set -Point
					Ignition Control Board
				De-energizes Gas Valve
				Blower Runs 60 Seconds
					Post Purge Cycle and
					Shuts Off

Blower Prover Switch Contacts Re-open

Ignition Control Board Goes into Standby Mode

Figure 11

Servicing should only be performed by a Qualified Service Agent

15