American Water Heater VG6250T100NV Instruction Manual download pdf (Page 50)

SEQUENCE OF OPERATION FLOW CHART

YES NO

Water is heated to

set point

24 V Gas Valve

de-energized

15 second

Inter-Purge cycle

24 V Gas Valve

de-energized

Retries up to

two more times

60 second

Post-Purge cycle

Control System

Locks Out

“Ignition Failure”

Fault Msg is

displayed

Water heater goes

into standby mode

If tank temperature drops below Operating Set Point minus

Differential setting a heating cycle is activated

Blower Prover switch contacts confirmed

closed by control system

Igniter is energized for warm up period

24 V Gas Valve is energized

gas flows to Main Burner

Is flame sensed at the Main Burner ?

(control system monitors the flame sensor)

Control System Locks Out

Displays Fault Msg

Control System Locks Out

“Blower Prover Open”

Fault Msg is displayed

Control System Locks Out

“Low Igniter Current”

Fault Msg is displayed

Combustion Blower is energized

Pre-Purge cycle

Does Control System sense minimum

Igniter amps ?

Control System performs diagnostic checks

Normal State of all pressure switches and ECO are checked

Blower Prover pressure switch verified open

All other pressure switches and ECO are verified closed

0.6 minimum AC amps

FIGURE 39.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 56

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American Water Heater VG6250T100NV Instruction Manual Page 50

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