Carrier 58UVB manual Remove Furnace Door, Control Switch to OFF, Control Switch to ON

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Fig. 10 - Remove Furnace Door

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Fig. 11 - Control Switch to OFF

	M	1
O	P	3
F
F	C	2
	ON

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Fig. 12 - Control Switch to OFF

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Fig. 13 - Control Switch to ON

	M	1
O	P	3
F
F	C	2
	ON

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Fig. 14 - Control Switch to ON

7.Replace main furnace door. (See Fig. 15.)

8.Turn ON the electrical supply to the furnace and wait 1 minute. (See Fig. 16.)

9.Open the external manual gas valve. (See Fig. 17.)

10.Set the room thermostat to a temperature slightly above the room temperature. This will automatically signal the furnace to start.

11.When the furnace receives the start signal, the inducer is started. When the pressure switch senses that there is suf- ficient combustion air, the hot surface igniter is energized. After the hot surface igniter is heated for 17 seconds, the gas valve permits gas to flow to the main burners. After ignition and a time delay of about 30 sec, the furnace blower will start. Variable-capacity furnaces start at low speed until the control makes the necessary adjustments to operate the blower at either the low- or high-heat speed.

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Fig. 15 - Furnace Door Replaced

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Fig. 16 - Turn On Electrical Supply

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