American Water Heater (A)BCG385T500-8N Water Heater User Manual


 
15
Servicing should only be performed by a Quali ed Service Agent
OPERATION AND SERVICE
OPERATING SEQUENCE - FLOW CHART
Figure 11
Power On
Call for Heat
Self diagnostic check is performed
(Correct state of Blower Prover Switch and ECO is verified)
(polarity, earth ground , and Igniter presence are verified )
YES
Blower Prover Switch (N.O.) Contacts
Close at – 2.85“ W.C. ± 0.13” W.C.
Ignition Control Board
Sends Voltage (80-120 VAC)
to Igniter for 17-20 Seconds.
YES
Ignition Control Board Energizes
Gas Valve (24 VAC)
Igniter De-energized After 3 Seconds
Ignition Control Board Waits 3
More Seconds For “Strong” Flame
Sense Signal (2.0 uA DC or more)
Tank Heated to Set-Point
Ignition Control Board
De-energizes Gas Valve
YES
Blower Runs 60 Seconds
Post Purge Cycle and
Shuts Off
Blower Prover Switch Contacts Re-open
Ignition Control Board Goes into Standby Mode
Control Locks Out - LED
Displays 2, 6, or 8
Flash Error Code
(See Error Code Chart )
NO
Control Locks Out
Displays 3 Flash
Error Code
NO
Below 0.1 uA DC Flame Sense:
Heater Will Try to Ignite 3 Times
Control De-energizes Gas Valve
Blower Runs for Post Purge Period
Control Locks Out for 1 Hour
Displays 1 Flash Error Code
Between 2.0 and 0.1 uA DC Flame Sense
Heater Will Continue to Operate
Displays 7 Flash Error Code
(Weak Flame Sense)
NO
Blower (Draft Inducer)
Motor is Energized