Bryant 355MAV User Manual download pdf (Page 8)

WARNING: FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could result

in serious injury, death or property damage.

Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically

for the detection of leaks to check all connections. A fire

or explosion may result causing property damage, per-

sonal injury or loss of life.

16. Replace main furnace door.

VI. SERVICING HOT SURFACE IGNITER

The igniter does NOT require annual inspection. Check igniter

resistance before removal.

1. Turn off gas and electrical supplies to furnace.

2. Remove main furnace door.

3. Disconnect igniter wire connection.

4. Check igniter resistance.

a. Using an ohm meter, check resistance across both igniter

leads in connector.

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

c. If ohm reading is higher than 110 ohms, igniter is

cracked and must be replaced.

5. Remove igniter assembly.

CAUTION: BURN HAZARD

Failure to follow this caution may result in minor

personal injury.

Allow igniter to cool before removal. Normal operating

temperatures exceed 2000°F.

a. Do not remove igniter from bracket while assembly is in

furnace. Using a 1/4 in. nutdriver, remove screw secur-

ing bracket and ignitor assembly to bottom of burner

box. The screw in the bracket is always located toward

outside of burner box. The screw may be hidden by inlet

box or inlet pipe, but can be removed without removing

either. After removing screw, slide igniter and bracket

toward outside of burner box and pull straight out.

CAUTION: UNIT DAMAGE HAZARD

Failure to follow this caution may result in premature

failure of the igniter.

The igniter is fragile. DO NOT allow it to hit the side of

the burner box opening while removing or replacing it.

b. Inspect igniter for a white area indicating a crack may be

present. If found, replace igniter.

NOTE: A small crack cannot be seen on a new igniter. After a

period of operation, a white area will be visible around the crack.

c. If replacement is required, replace igniter on igniter

bracket external to furnace to avoid damage as the

silicon portion is very brittle and will easily crack or

shatter.

d. To remove igniter from igniter bracket, remove screw

holding igniter ceramic block to bracket and pull ce-

ramic block out of bracket.

6. To replace igniter/igniter assembly, reverse items 5a

through 5d.

7. Reconnect igniter wire connection.

8. Turn on gas and electrical supplies to furnace.

9. Verify igniter operation by initiating control board self-test

feature or by cycling thermostat.

10. Replace main furnace door.

VII. ELECTRICAL CONTROLS AND WIRING

WARNING: ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

There may be more than 1 electrical supply to the unit.

Check accessories and cooling unit for additional electri-

cal 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.

NOTE: If the polarity is not correct, the STATUS LED on the

furnace control will flash rapidly and prevent the furnace from

operating. The control system also requires an earth ground for

proper operation of the furnace control and flame sensor.

BURNER FLAME

BURNER

MANIFOLD

A89020

Fig. 10—Burner Flame

RTV

PAM

A93081

Fig. 11—Gasket on Collector Box

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Bryant 355MAV User Manual Page 8

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