International comfort products F9MXT0401410A Service And Technical Support Manual page 18

SERVICE AND TECHNICAL SUPPORT MANUAL
6. Remove individual wires from terminals on gas valve.
7. Disconnect Hot Surface Igniter (HSI) wires from HSI.
8. Disconnect Flame Sensor wire from Flame Sensor.
9. Support the manifold and remove the four screws that
secure the manifold assembly to the burner assembly
and set aside. Note the location of the green/yellow wire
and ground terminal.
10. Inspect the orifices in the manifold assembly for
blockages or obstructions. Remove orifice and clean or
replace orifice.
11. Remove the four screws that attach the top plate of the
casing to the furnace.
12. Raise top plate up slightly and prop it up with a small
piece of wood or folded cardboard.
13. Support the burner assembly and remove the screws
that attach the burner assembly to the heat exchanger
cell panel.
14. Remove wires from both rollout switches.
15. Slide one−piece burner out of slots on sides of burner
assembly.
16. Remove the flame sensor from the burner assembly.
17. (Optional) Remove the Hot Surface Igniter (HSI) and
bracket from the burner assembly.
18. Check igniter resistance. Nominal resistance is 40 to 70
ohms at room temperature and is stable over the life of
the igniter.
19. Clean burner with a brush and a vacuum.
20. Clean the flame sensor with fine steel wool (0000 grade).
Do not use sand paper or emery cloth.
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.
To reinstall burner assembly:
1. Install the Hot Surface Igniter (HSI) and bracket in burner
assembly.
2. Install flame sensor on burner.
3. Align the edges of the one-piece burner with the slots in
the burner assembly and slide the burners forward until
they are fully seated in the burner assembly.
4. Align the orifices in the manifold assembly with the
support rings on the end of the burner.
5. Insert the orifices in the support rings of the burners.
NOTE: If manifold does not fit flush against the burner, do not
force the manifold on the burner assembly. The burners are not
fully seated forward in the burner assembly. Remove the
manifold and check burner positioning in the burner assembly
assembly before re-installing the manifold.
18
Figure 10
Figure 11
10. Align the burner
11. Connect the wire for the flame sensor.
12. Connect the wire for the Hot Surface Igniter.
F R S
LAME OLL−OUT WITCH
NOTE: Use propane-resistant pipe dope to prevent leaks. Do
not use Teflon tape.
13. Install the gas pipe to the gas valve.
L11F064
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
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
15. Turn gas on at electric switch on gas valve and at
Specifications subject to change without notice.
Gas Furnace: (F/G)9MXT
6. Attach the green/yellow wire and ground terminal to one
of the manifold mounting screws.
7. Install the remaining manifold mounting screws.
8. Check the igniter alignment. See Figure 9, Figure 10
and Figure 11.
Igniter Position − Top View
1-1/4-in.
(31.8)
2-1/2-in.
(64.4)
Igniter Position − Side View
2 − in.
(50 mm)
3/8 − in.
(9.6 mm)
9. Attach the wires to the roll-out switches.
assembly with the openings in the
primary cell inlet panel and attach the burner assembly to
the cell panel.
WARNING
!
available soap
solution made specifically for the detection of leaks.
external shut-off or meter
A11405
3/16− in.
(4.6 mm)
3/32 − in., +1/32 -3/64-in.
(2.5 mm
, +0.8 -1.5)
A12392
solution made
440 04 4321 08