Polaris 200 series, Instruction Manual, Page: 48 / 62

48
SEQUENCE OF OPERATION FLOW CHART
YES NO
Water is heated to
set point
60 second Inter-Purge cycle
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
Igniter is energized
24 V Gas Control Valve is energized
gas flows to Main Burner
24 V Gas Control Valve
de-energized
24 V Gas Control Valve
de-energized
Is flame sensed at the Main Burner ?
(control system monitors the flame sensor)
Control System Locks Out
Displays Fault Msg
NO
Combustion Blower is energized
30 Second Pre-Purge cycle
Control System performs diagnostic checks
Normal State of all pressure switches and ECO are checked
Pressure Switches and ECO are verified closed
Figure 45