16. Replace main furnace door.
Step 6—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. 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.
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. 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.
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 parts while removing or replacing it.
e. If replacement is required, replace igniter on igniter bracket
and then install assembly to 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).
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in electrical shock,
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.
8. Reinstall burner box cover.
9. Turn on gas and electrical supplies to furnace.
10. Verify igniter operation by initiating furnace control self-test
feature or by cycling thermostat.
11. Replace main furnace door.
Step 7—Electrical Controls and Wiring
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 furnace.
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. 15 for field wiring information
and to Fig. 21 for furnace wiring information.
NOTE: If the polarity is not correct or the furnace is not properly
grounded, 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.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the control center. (See Fig. 16.) Any direct shorts of the 24-v
wiring during installation, service, or maintenance will cause this
fuse to blow. If fuse replacement is required, use ONLY a fuse of
identical size (3-amp). The control LED will flash status code 24
when fuse needs to be replaced.
With power to the unit disconnected, check all electrical connec-
tions for tightness. Tighten all screws on electrical connections. If
→ Fig. 13—Igniter Bracket
A05075
BRACKET
IGNITER
9/16˝
11/16˝
EXTENDED IGNITER
BRACKET HANDLE
IGNITER BRACKET
MOUNTING SCREW
→ Fig. 14—Igniter
A04181
2-5/32˝
9
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