Carrier 58MXA instruction manual ÐControl Center, ÐChecking Heat Tape Operation If Applicable

	BLOWER OFF DELAY
	ADJUSTMENT SWITCH
	G	24V THERMOSTAT
		TERMINALS
	R
	Y
TEST/TWIN	W	HUMIDIFIER TERMINAL
	Com
	24V	(24-VAC 0.5 AMP MAX)
	HUM	LED OPERATION &
		STATUS LIGHT
		HARNESS CONNECTOR

SEC-1	24V TRANSFORMER SEC-2
3-AMP FUSE	SPARE 1
COOL
	BLOWER SPEED
HEAT
	SELECTION TERMINALS
	SPARE 2
	EAC 1 (BLACK)
	EAC-ELECTRONIC AIR CLEANER
	TERMINALS (115-VAC 1.5 AMP MAX)
115-VAC (L1)	EAC 2 (WHITE)
POWER	115-VAC (L2) NEUTRAL
SUPPLY
	CONNECTION
HOT SURFACE	INDUCER MOTOR
IGNITOR	CONNECTOR
CONNECTOR

A93052

Fig. 12ÐControl Center

1.Leave 115-v power to furnace turned on.

2.Remove main furnace door.

3.Look into blower access panel sight glass for current LED status.

NOTE: Leave blower access panel installed to maintain power to control center to view current LED status.

4.BRIEFLY remove either wire from the main limit switch until the LED goes out, then reconnect it.

Make sure limit switch wire does not contact any metallic component such as the gas valve. If wire is shorted, 3-amp fuse on control center will blow.

NOTE: If wire to main limit is disconnected longer than 4 sec, the control senses limit circuit is open. Main blower will start and retrieval request will be ignored.

5.When above items have been completed, the component test sequence will occur as described in the Component Test Sequence section above.

NOTE: Be sure to record the status code which is flashed 4 times at start of component test for further troubleshooting.

6.After component test is completed and LED is ON continu- ously indicating the furnace is ready to operate when a signal from the thermostat is received, replace main furnace door.

INITIATING COMPONENT TEST AND RETRIEVING STA- TUS CODE BY JUMPERING CONTROL TEST TERMINAL

1.Remove main furnace door.

2.Remove blower access panel.

3.Manually close blower access panel door switch. Use a piece of tape to hold switch closed.

Blower access panel door switch opens 115-v power to control center. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. Failure to follow this warning could result in electrical shock, personal injury, or death.

4.BRIEFLY short (jumper) TEST, 1/4-in. quick-connect termi- nal on control center (adjacent to the LED diagnostic light) and the COM terminal on thermostat connection block. (See Fig. 12.)

NOTE: If TEST to COM terminals are jumpered longer than 2 sec, LED will flash rapidly, and retrieval request will be ignored.

5.When above items have been completed, the component test sequence will occur as described in the Component Test Sequence section above.

NOTE: Be sure to record the status code which is flashed 4 times at start of component test for further troubleshooting.

6.After component test is completed and furnace is operating properly, release blower access panel door switch, replace blower access panel, and replace main furnace door.

Step 9ÐChecking Heat Tape Operation (If Applicable)

In applications where the ambient temperature around the furnace is 32°F or lower, freeze protection measures are required. If this application is where heat tape has been applied, check to ensure it will operate when low temperatures are present.

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