CLEVELAND RANGE
SEQUENCE OF OPERATIONS
24CGP10
Mechanical Timer
1.
To turn the unit on, depress the red on/off rocker switch.
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115 VAC is sent to normally open blowdown valve closing it.
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115 VAC is sent to the Timed/Manual switches for the cabinets.
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115 VAC is sent to L1 and L2 of the water level board.
2.
With the water level board energized and no water in the boiler
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115 VAC is sent from the IND terminal to the low water indicator light on the console.
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115 VAC is sent from the WF terminal to the fill solenoid after a 5-second delay.
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The fill solenoid opens and the boiler fills.
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The water fills to the secondary low water cutoff probe in the boiler, shorting it to
ground
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115 VAC is removed from the IND terminal and the low water indicator light is
de-energized.
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115 VAC is sent from the HTR terminal through the normally closed contact of
the high-pressure switch to the amber reset switch,
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115 VAC is sent through the normally closed R1 contacts to energize the amber
light.
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If the low water cut off probe is not grounded for 20 seconds, 115 VAC is
removed from HTR and sent back to IND energizing the low water light.
3.
When the momentary amber switch is depressed 115 VAC is sent to the R1 relay closing it.
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The normally closed R1 contacts open de-energizing the amber light.
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The relay latches through the normally closed contacts of R1
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If either the high-pressure switch (set at 15 PSI) or the low probe circuit on the
water level board opens, then the latch circuit opens.
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When the water level or pressure returns to a safe condition the amber light will
energize and the process may begin again.
4.
The R1 relay contacts close sending 115 VAC through the normally closed operating
pressure switch to the 24 VAC transformer.
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24VAC is sent through the low water cutoff float switch to the R2 relay coil.
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The normally open R2 contacts close and send 115 VAC to the fan.
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The fan turns and the air prover switch is closed.
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24 VAC is sent through the air prover switch to the ignition module.
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With 24 VAC to the ignition module 24VAC is sent to the pilot coil on the gas
valve.
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A spark is generated at the igniter.
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The pilot valve is energized and opens.
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Gas is sent to the pilot burner.
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The gas is ignited and the flame rectifies the AC current.