Servicing Hot Surface Igniter - Tempstar (F/G)9MAC0601714A Service And Technical Support Manual

SERVICE AND TECHNICAL SUPPORT MANUAL
8. Check the igniter alignment. See Figure 9, Figure 10
and Figure 11.
Figure 9 Burner Assembly
B S A
URNER UPT. SSY
B A
URNER SSY
F S
LAME ENSOR
B B
( ELOW URNER)
Representative drawing only, some models may vary in appearance.
Figure 10 Igniter Position − Top View
1-1/4-in.
(31.8)
2-1/2-in.
(64.4)
9. Attach the wires to the roll-out switches.
10. Align the burner assembly with the openings in the
primary cell inlet panel and attach the burner assembly to
the cell panel.
11. Connect the wire for the flame sensor
12. Connect the wire for the Hot Surface Igniter.
NOTE: Use propane-resistant pipe dope to prevent leaks. Do
not use Teflon tape.
13. Install the gas pipe to the gas valve.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Never purge a gas line into a combustion chamber. 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, personal injury or loss of life.
14. Check for gas leaks with a soap and water solution.
15. Turn gas on at electric switch on gas valve and at
external shut-off or meter
20
Figure 11
F R S
LAME OLL−OUT WITCH
L11F064
16. Turn power on at external disconnect, fuse or circuit
17. Run the furnace through two complete heating cycles to
18. Install outer door when complete.

Servicing Hot Surface Igniter

The igniter does NOT require annual inspection. Check igniter
resistance before removal. Refer to Figure 9, Figure 10 and
Figure 11.
A11405
Specifications subject to change without notice.
Gas Furnace: (F/G)9MAC
Igniter Position − Side View
2-in.
3/8-in.
breaker.
check for proper operation
1. Turn off gas and electrical supplies to furnace.
2. Remove control 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.
Resistance reading will increase as igniter temperature
increases.
5. Remove igniter assembly.
a. Using a 1/4−in. driver, remove the two screws securing
the igniter mounting bracket to the burner assembly.
(See Figure 9)
b. Carefully withdraw the igniter and bracket assembly
through the front of the burner assembly without striking
the igniter on surrounding parts.
c. Inspect igniter for signs of damage or failure.
d. If replacement is required, remove the screw that
secures the igniter on igniter bracket and remove the
igniter.
6. To replace igniter and bracket assembly, reverse items
5a through 5e.
7. Reconnect igniter harness to the igniter, dressing the
igniter wires to ensure there is no tension on the igniter
itself. (See Figure 9)
8. Turn on gas and electrical supplies to furnace.
9. Verify igniter operation by initiating control board self−test
feature or by cycling thermostat.
.
3/16-in.
(2.5 mm +/- .75 mm)
A11272
440 04 4201 01