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SERVICE AND TECHNICAL SUPPORT MANUAL
8. Check the igniter alignment. See Figure 9, Figure 10
and Figure 11.
Figure 10
Igniter Position − Top View
1-1/4-in.
(31.8)
2-1/2-in.
(64.4)
Figure 11
Igniter Position − Side View
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 commercially available soap
solution made specifically for the detection of leaks.
15. Turn gas on at electric switch on gas valve and at
external shut-off or meter
16. Turn power on at external disconnect, fuse or circuit
breaker.
17. Run the furnace through two complete heating cycles to
check for proper operation
18. Install control door when complete.
440 04 4311 08
A11405
2 − in.
(50 mm)
3/8 − in.
(9.6 mm)
3/16− in.
(4.6 mm)
3/32 − in., +1/32 -3/64-in.
(2.5 mm
, +0.8 -1.5)
A12392
Specifications subject to change without notice.
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.
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.
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 5d.
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.
10. Replace control door.
Flushing Collector Box and Drainage System
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Turn off the gas and electrical supplies to the furnace and
install lockout tag before performing any maintenance or
service. Follow the operating instructions on the label
attached to the furnace.
1. Turn off gas and electrical supplies to furnace.
2. Remove control door.
3. Disconnect pressure switch tube from pressure switch
port.
NOTE: Ensure the pressure switch tube disconnected from the
pressure switch is higher than the collector box opening or
water will flow out of tube.
4. Remove the collector box plug from the top port on the
upper corner of the collector box. (See Figure 1)
5. Attach a funnel with a flexible tube to port on the collector
box.
6. Flush inside of collector box with water until discharge
water from condensate trap is clean and runs freely.
7. Repeat steps 4 through 6 with middle plug on upper
corner of collector box.
8. Remove the pressure switch tube from the collector box.
Gas Furnace: (F/G)9MXE
19
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