Cleveland 24-CGM-200, Дополнительное руководство

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CLEVELAND RANGE
SEQUENCE OF OPERATIONS
Gas Boiler Base
With Secondary Low Water Cut Off Switch
1. To turn the unit on, depress the red on/off rocker switch.
x
115 VAC is sent to the terminal block in control box.
x
115 VAC is sent to normally open blowdown valve closing it.
x
115 VAC is sent to L1 and L2 of the water level board.
x
115 VAC is sent to the open contacts of the low water cut-off switch.
x
115 VAC is sent through the normally closed contacts of the R2 relay to the low water
indicator light.
2. With the water level board energized and no water in the boiler
x
115 VAC is sent from the IND terminal to the normally open contacts of R2A.
x
115 VAC is sent from the WF terminal to the fill solenoid.
x
The fill solenoid opens and the boiler fills.
x
The rising water raises the float on the low water cut-off switch closing it.
x
R2 relay is energized.
x
The normally closed contacts R2A open de-energizing the low water indicator
light.
x
The normally open contacts of R2A close energizing the low water indicator light.
x
The water fills to the low probe shorting it to ground
x
115 VAC is removed from the IND terminal and the low water indicator light is
de-energized.
x
If the low water cut off float switch opens the low water indicator light re-
energizes.
x
115 VAC is sent from the HTR terminal to the normally open contacts of R2B.
x
With water in the unit and the R2 relay energized, 115 VAC is sent through the
normally closed contact of the high-pressure switch to the amber reset switch,
x
115 VAC is sent through the normally closed R1B contact to energize the amber
light.
3. When the momentary amber switch is depressed 115 VAC is sent to the R1 relay closing it.
x
The normally closed R1B contacts open de-energizing the amber light.
x
The relay latches itself through contacts 3 and 5 with a jumper to the coil.
x
If either the high-pressure switch opens, the secondary low water cut off switch
opens, or the low probe circuit on the water level board opens, then the latch
circuit opens.
x
When the water level or pressure returns to a safe condition the amber light will
energize and the process may begin again.
x
The R1B relay contacts close sending power through the normally closed operating
pressure switch to the 24 VAC transformer.
x
24 VAC is sent to the ignition module.