Carrier 58MCA ÐFlushing Collector Box and Drainage System, ÐServicing Hot Surface Ignitor

BURNER FLAME

BURNER

MANIFOLD

A89020

Fig. 9ÐBurner Flame

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.

18. Replace main furnace door.

SECONDARY HEAT EXCHANGERS

NOTE: The condensing side (inside) of the secondary heat exchangers CANNOT be serviced or inspected. A small number of bottom outlet openings can be inspected by removing the inducer assembly. See Flushing Collector Box and Drainage System section for details on removing inducer assembly.

Step 5ÐFlushing Collector Box and Drainage System

1.Turn off gas and electrical supplies to furnace.

2.Remove main furnace door.

3.Disconnect inducer motor and pressure switch wires or connectors.

4.Disconnect pressure switch tubes.

5.Disconnect vent pipe from inducer housing outlet by loosen- ing clamp.

6.Disconnect drain tube from inducer housing. (See Fig. 8.)

7.Remove inducer housing assembly by removing 4 bolts attaching assembly to cell panel.

8.Flush inside of collector box with water until discharge from condensate trap is clean and runs freely.

NOTE: Ensure the drain tube disconnected from the inducer housing is higher than the collector box opening or water will flow out tube.

9.Inspect inside area of collector box for any pieces of foreign materials and remove if present.

DO NOT use wire brush or other sharp object to inspect or dislodge materials in secondary heat exchangers as failure of the secondary heat exchanger will occur. Flush with water only.

10.Reassemble inducer assembly by reversing items 5 through 7. NOTE: If seal between the inducer housing and the collector box is damaged in any way, it must be repaired. To repair, apply sealant releasing agent such as PAM cooking spray or equivalent

(must not contain corn or canola oil, aromatic or halogenated hydrocarbons) to inducer housing. (See Fig. 10.) Apply a small bead of G.E. RTV 162, G.E. RTV 6702, or Dow-Corning RTV 738 sealant to groove in collector box.

PAM

RTV

A93081

Fig. 10ÐGasket on Collector Box

11.Refer to furnace wiring diagram and reconnect wires to inducer motor and pressure switch or connectors.

12.Reconnect pressure tubes to pressure switch. See diagram on main furnace door for proper location of tubes. Be sure tubes are not kinked. (See Fig. 8.)

13.Turn on gas and electrical supplies to furnace.

14.Check furnace operation through 2 complete heat operating cycles. Check area below inducer housing, vent pipe, and condensate trap to ensure no condensate leaks occur. If leaks are found, correct the problem.

15.Check for gas leaks.

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.

16. Replace main furnace door.

Step 6ÐServicing Hot Surface Ignitor

The ignitor does NOT require annual inspection. Check ignitor resistance before removal.

1.Turn off gas and electrical supplies to furnace.

2.Remove main furnace door.

3.Disconnect ignitor wire connection.

4.Check ignitor resistance.

a.Using an ohm meter, check resistance across both ignitor leads in connector.

b.Cold reading should be between 45 ohms and 90 ohms.

c.If ohm reading is higher than 110 ohms, ignitor is cracked and must be replaced.

5.Remove ignitor assembly.

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