Carrier 58MCA Instruction Manual download pdf (Page 5)

Never use matches, candles, flame, or other sources of

ignition to check for gas leakage. Use a soap-and-water

solution. Failure to follow this warning could result in a fire,

personal injury, or death.

19. Replace main furnace door.

Step 4—Cleaning Heat Exchangers

The following items should be performed by a qualified service

technician.

PRIMARY HEAT EXCHANGERS

If the heat exchangers get an accumulation of light dirt or dust on

the inside, they may be cleaned by the following procedure:

NOTE: If the heat exchangers get a heavy accumulation of soot

and carbon, both the primary and secondary heat exchangers

should be replaced rather than trying to clean them thoroughly due

to their intricate design. A build-up of soot and carbon indicates

that a problem exists which needs to be corrected, such as

improper adjustment of manifold pressure, insufficient or poor

quality combustion air, improper vent termination, incorrect size

or damaged manifold orifice(s), improper gas, or a restricted heat

exchanger (primary or secondary). Action must be taken to correct

the problem.

1. Turn off gas and electrical supplies to furnace.

2. Remove main furnace door.

3. Disconnect wires or connectors to rollout switch, gas valve,

ignitor, and flame sensor.

Label all wires prior to disconnection when servicing con-

trols. Wiring errors can cause improper and dangerous

operation.

4. Disconnect combustion-air intake pipe from intake housing.

5. Remove the pressure switch tube from intake housing.

6. Remove screws attaching intake housing to burner box, and

rotate intake housing away from burner box for removal.

7. Using backup wrench, disconnect gas supply pipe from gas

valve.

8. Disconnect pressure tubing from gas valve.

9. Remove 2 screws attaching top filler panel and rotate upwards

to gain access to screws attaching burner box to cell panel.

10. Remove screws attaching burner box to cell panel. (See Fig.

5.)

NOTE: Burner box cover, manifold, gas valve, and burner

assembly should be removed as 1 assembly.

11. Clean heat exchanger openings with a vacuum and a soft

brush. (See Fig. 6.)

NOTE: After cleaning, inspect the heat exchangers to ensure they

are free of all foreign objects that may restrict flow of combustion

products.

12. Reverse items 4 through 10 for reassembly.

The ground wire from the gas valve MUST be attached to the

burner box attachment screw. Failure to attach this ground

wire to an adequate casing ground will cause the furnace

control to lock out.

NOTE: Be sure burner box gasket is installed between burner box

and cell panel. If gasket is damaged, replace it.

NOTE: Inspect combustion-air intake housing. If foamed gasket

was removed, check for any damage. If gasket is damaged in any

way, it must be repaired. To repair, remove damaged gasket

section, apply sealant releasing agent such as PAM cooking spray

or equivalent (must not contain corn or canola oil, aromatic or

halogenated hydrocarbons) to burner box and apply a small bead

of G.E. RTV 162, G.E. RTV 6702, or Dow-Corning RTV 738

sealant to edge of combustion-air intake housing. (See Fig. 7.)

13. Refer to furnace wiring diagram and reconnect wires to rollout

switch, gas valve, ignitor, and flame sensor.

14. Reconnect pressure switch tubes to gas valve and intake

housing. Refer to tube routing label on main furnace door for

proper tube location. Be sure tubes are not kinked. (See Fig.

8.)

15. Turn on gas and electrical supplies to furnace.

16. Check furnace operation through 2 complete heat operating

cycles. Look through sight glass in burner enclosure to check

burners. Burner flames should be clear blue, almost transpar-

ent. (See Fig. 9.)

17. Check for gas leaks.

Fig. 6—Cleaning Inlet Openings of Primary Heat

Exchangers

A93080

PRIMARY HX

INLET OPENINGS

Fig. 7—Combustion-Air Intake Housing Gasket

Repair

A93087

PAM

RTV

1 2 3 4 5 6 7 8 9 10 ... 15 16

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Carrier 58MCA Instruction Manual Page 5

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