Cleaning Burners And Flame Sensor - International comfort products F9MXT0401410A Service And Technical Support Manual

SERVICE AND TECHNICAL SUPPORT MANUAL
Figure 8 Blower Assembly
MOTOR SHAFT FLAT
SET SCREW
SCREW LOCATION
BLO HSG ASSY
BRACKET
BRACKET
ENGAGEMENT
DETAIL
A
SEE DETAIL
CUTOFF, BLOWER
BRACKET
POWER CHOKE
OR CAPACITOR
WHEN REQUIRED
SCREW
(GND)
440 04 4321 08
MOTOR WHEEL HUB
A11584A
GROMMET
MOTOR ARM
SCREW
A11584B
A
A11584C
A11584D
WHEEL, BLOWER
BLOWER HSG ASSY
MOTOR, BLOWER
A11584E
Specifications subject to change without notice.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Blower door switch opens 115−V power to control. No
component operation can occur unless switch is closed.
Caution must be taken when manually closing this
switch for service purposes.
16. Downflow or horizontal furnaces with vent pipe through
furnace only:
a. Install and connect short piece of vent pipe inside
furnace to existing vent.
b. Connect vent connector to vent elbow.
17. Turn on electrical supply. Manually close blower door
switch. Use a piece of tape to hold switch closed. Check
for proper rotation and speed changes between heating
and cooling by jumpering R to G and R to Y/Y2 on
furnace control thermostat
temperature is below 70_F (21_C), turn off circuit breaker
to outdoor unit before running furnace in the cooling
cycle. Turn outdoor circuit breaker on after completing
cooling cycle. (See Figure 4)
NOTE: If R−W/W1 thermostat terminals are jumpered at the
time blower door switch is closed, blower will run for 90 sec
before beginning a heating cycle.
a. Perform component self−test as shown at the bottom
of the SERVICE label, located on the control door.
b. Verify blower is rotating in the correct direction
18. If furnace is operating properly, RELEASE BLOWER
DOOR SWITCH. Remove any jumpers or reconnect any
disconnected thermostat leads. Replace blower door.
19. Turn on gas supply and cycle furnace through one
complete heating cycle. Verify the furnace temperature
rise as shown in
temperature rise as shown in Adjustments Section.

Cleaning Burners and Flame Sensor

The following items must be performed by a qualified service
technician. If the burners develop an accumulation of light dirt
or dust, they may be cleaned by using the following procedure:
NOTE: Use a back-up wrench on the gas valve to prevent the
valve from rotating on the manifold or damaging the mounting
to the burner assembly.
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.
instructions on the label attached to the furnace.
Refer to Figure 9.
1. Disconnect power at external disconnect, fuse or circuit
breaker.
2. Turn off gas at external shut-off or gas meter.
3. Remove control door and set aside.
4. Turn electric switch on gas valve to OFF.
5. Disconnect the gas pipe from gas valve and remove pipe
from the furnace casing.
Gas Furnace: (F/G)9MXT
terminals. If outdoor
Adjustments Section. Adjust
Follow the operating
17