PEERLESS SERIES PSC

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START

TRIAL

FOR

IGNITION

MAIN

BURNER

OPERATION

I APPLY 24 VAC ITO APPLIANCE

LTBE°M°STATJ

CALLS FOR HEAT

I FLAME SIGNAL _ • WAlT FOR FLAME SIGNAL

DETECTED? I Y l TO DISAPPEAR

• PILOT VALVE/IGNITER

_NO REMAIN OFF

I NO

INTERNAL CHECK OKAY? I

J_YES

• PILOT VALVE OPENS

• IGNITER POWERED

PILOTLIGHTSAND FLAME NO •

I D RIN PILOT VALVE CLOSES

YES

• IGNITER OFF J

• MAIN VALVE OPENS

END

I LAME SIGNAL LOST?

I THERMOSTAT CALL FOR I

HEAT ENDS

• MAIN AND PILOT VALVES CLOSE

• MAIN AND PILOT VALVES CLOSE I

FLAME LOST MORE THAN I NO

FIVE TIMES IN ONE

p--

CALL FOR HEAT?

J IYESl

IGNITER WILL TURN OFF ABOUT 30 SECONDS INTO THE TRIAL FOR IGNITION,

IF THE PILOT FLAME HAS NOT LIT, IT WILL TURN BACK ON FOR THE FINAL

30 SECONDS OF THE 90 SECOND TRIAL FOR IGNITION. THE PILOT VALVE

WILL BE ENERGIZED DURING THE ENTIRE TRIAL FOR IGNITION. THIS IS

NORMAL OPERATION FOR THIS GAS IGNITION SYSTEM.

I IVE-MINUTE RETRY 1DELAY

Figure 16: Ignition System Operating Sequence

PEERLESS SERIES PSC - Page 20