Cleveland SteamCraft 10 Service Manual page 109

Models 24-CGA-10, and 24-CEA-10
IT:2-4 Do the burners ignite shortly after the fan motor starts.
IT:2-5 Do the fan and burners shut off when the pre -heat thermostat opens.
Phase 2 testing is complete. Proceed to Phase 3 testing.
Cleveland Range, Inc.
SteamCraft 10 Service Manual, Chapter 6
5. Check for 120V at the fan motor terminals.
• If this voltage is present, replace the motor.
• If this voltage is not present, check the main power supply, associated
wiring, and connections LI and L2.
NOTE: The burner fan forces air through the combustion chamber and
heat exchanger. When this air flow reaches the required volume per
minute, the normally open Air Prover Pressure Switch closes. This closure
activates the Burner Control Module. The module controls the spark
igniter and gas valve. These three components initiate and control pilot and
burner ignition. Failure of any of the four components listed below can
prevent burner ignition during the preheat cycle.
• Air Prover Pressure Switch
• Burner Control Module
• Pilot Spark Igniter
• Gas Control Valve
To test these components, refer to the Honeywell and White-Rogers
manuals in Chapter 8.
When the water in the steam generator approaches steam tempera-
NOTE:
ture, the pre-heat thermostat opens (at 185°). This deenergizes relay R3
and cuts power to the fan motor. As air flow through combustion chamber
stops, the Air Prover Pressure Switch opens, cutting power to the Burner
Control Module. The gas burners shut off.
Failure of any of three components can prevent the preheat shutdown of
the gas burners.
Check the preheat thermostat according to component test
1.
2. Check the relay R3 according to the relay testing instructions in Compo-
nent Testing Fundamentals.
3. Check the Air Prover Pressure Switch according to the manuals in
Chapter 8.
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CT:8.
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