Bryant 355CAV Service And Maintenance Procedures Manual page 10

1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Disconnect igniter wire connection.
4. Check igniter resistance. Igniter resistance is affected by
temperature. Only check resistance when the igniter is at
room temperature.
a. Using an ohm meter, check resistance across both igniter
leads in connector.
b. Cold reading should be between 40 ohms and 70 ohms.
5. Remove igniter assembly.
a. Remove burner box cover.
b. Remove igniter wires from slot in manifold grommet.
(See Fig. 7.)
c. Using a 1/4- -in. driver, remove the single screw securing
the igniter bracket to the burner box bracket (See Fig. 13.)
and carefully withdraw the igniter and bracket assembly
through the front of the burner box without striking the
igniter on surrounding parts. Note that the igniter bracket
has a handle that extends to the front of the burner box
to aid in handling. (See Fig. 13.)
d. Inspect igniter for signs of damage or failure.
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 burner box
parts while removing or replacing it.
e. If replacement is required, replace igniter on igniter
bracket and then install assembly into burner box to avoid
damage to the igniter.
6. To replace igniter and bracket assembly, reverse items 5a
through 5d.
7. Reconnect igniter wire connection and insert the igniter
wires in the slot in the manifold grommet, dressing the
igniter wires to ensure there is no tension on the igniter
itself. (See Fig.7.)
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Igniter wires must be securely placed in slot in manifold
grommet or else they could become pinched or severed and
electrically shorted.
2-5/32˝
Fig. 14 - - Igniter
8. Reinstall burner box cover.
9. Turn on gas and electrical supplies to furnace.
10. Verify igniter operation by initiating control board
self- -test feature or by cycling thermostat.
11. Replace main furnace door.
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