Carrier 58MCA instruction manual ÐElectrical Controls and Wiring, Furnace

Allow ignitor to cool before removal. Normal operation temperatures exceed 2000°F.

a.Do not remove ignitor from retainer while assembly is in furnace. Using a small pocket straight-blade screwdriver, slowly pry 1 edge of the spring retainer from burner box housing. While working ignitor assembly loose, grasp white ceramic block to wiggle assembly (ignitor and retainer) from its location.

13 32"

BURNER

BURNER BOX

11 32"

CELL

PANEL

IGNITOR

ASSEMBLY

The ignitor is fragile. DO NOT allow it to hit the side of the burner box opening while removing or replacing it.

b.Inspect ignitor for a white area indicating a crack may be present. If found, replace ignitor.

NOTE: A small crack cannot be seen on a new ignitor. After a period of operation, a white area will be visible around the crack.

c. If replacement is required, replace ignitor on ignitor re- tainer external to furnace to avoid damage as the silicon portion is very brittle and will easily crack or shatter.

d.To remove ignitor from ignitor retainer, apply pressure on bottom/side clips to release pressure on ignitor ceramic block. Slowly work ceramic block out of spring retainer.

6.To replace ignitor/ignitor assembly, reverse items 5a through 5d. (See Fig. 11.)

7.Reconnect ignitor wire connection.

8.Turn on gas and electrical supplies to furnace.

9.Verify ignitor operation by initiating control board self-test feature or by cycling thermostat.

10.Replace main furnace door.

C IGNITOR

L

7 8"

C BURNER

L

IGNITOR

ASSEMBLY

A93260

Fig. 11ÐHot Surface Ignitor Location and Burner

Assembly

Step 7ÐElectrical Controls and Wiring

There may be more than 1 electrical supply to the unit. Check accessories and cooling unit for additional electrical supplies.

The electrical ground and polarity for 115-v wiring must be maintained properly. Refer to Fig. 12 for field wiring information and to Fig. 16 for unit wiring information.

FIELD 24-VOLT WIRING

FIELD 115-, 208/230-, 460-VOLT WIRING

FACTORY 24-VOLT WIRING

FACTORY 115-VOLT WIRING

			NOTE 2				THERMOSTAT
		FIVE	W	C R	G	Y		FIELD-SUPPLIED
							TERMINALS
		WIRE						FUSED DISCONNECT
		THREE-WIRE						208/230- OR
		HEATING-
		ONLY						460-VOLT
								THREE
BLK	BLK		W					PHASE
WHT	WHT		R
								208/230-
GND		GND						VOLT
115-VOLT FUSED		AUXILIARY	G					SINGLE
								PHASE
DISCONNECT		J-BOX	C	NOTE 1				GND
SWITCH		CONTROL	Y				CONDENSING
(WHEN		BOX					UNIT
REQUIRED)		24-VOLT					TWO
		TERMINAL					WIRE
			BLOCK	NOTES: 1.		Connect Y-terminal as shown for proper operation.
		FURNACE
					2.￿ Some thermostats require a "C" terminal connection as shown.

3.If any of the original wire, as supplied, must be replaced, use same type or equivalent wire.

A96415

→Fig. 12ÐField Wiring

8