International comfort products F8MVL Installation Instructions Manual page 47

FURNACE CASING WIDTH
14−1/2 (368)
17−1/2 (445)
21 (533)
24 (610)
* Recommended
Cleaning and/or Replacing Air Filter
The air filter arrangement will vary depending on the
application.
NOTE: If the filter has an airflow direction arrow, the arrow
must point towards the blower.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
Blower Motor and Wheel
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Blower access 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.
NOTE: The blower wheel should not be dropped or bent as
balance will be affected.
The following steps should be performed by a qualified
service agency.
To ensure long life and high efficiency, clean accumulated dirt
and grease from blower wheel and motor annually.
The inducer and blower motors are pre−lubricated and require
no additional lubrication. These motors can be identified by the
absence of oil ports on each end of the motor.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove outer door.
3. For downflow or horizontal furnaces having vent pipes
within the furnace that pass in front of the blower access
door:
a. Disconnect vent connector from furnace vent elbow.
b. Disconnect and remove short piece of vent pipe
from within furnace.
441 01 2122 01
Table 16 – Filter Size Information − In. (mm)
FILTER SIZE
SIDE
RETURN
16 X 25 X 3/4
(406 X 635 X 19)
16 X 25 X 3/4
(406 X 635 X 19)
16 X 25 X 3/4
(406 X 635 X 19)
16 X 25 X 3/4
(406 X 635 X 19)
Specifications are subject to change without notice.
BOTTOM
RETURN
14 X 25 X 3/4
(356 X 635 X 19)
16 X 25 X 3/4
(406 X 635 X 19)
20 X 25 X 3/4
(508 X 635 X 19)
24 X 25 X 3/4
(610 X 635 X 19)
4. Remove 2 screws from blower access door and remove
blower access door.
5. All factory wires can be left connected, but field thermostat
connections may need to be disconnected depending on
their length and routing.
6. Remove 2 screws holding blower assembly to blower deck
and slide blower assembly out of furnace.
7. Clean blower wheel and motor using a vacuum with soft
brush attachment. Blower wheel blades may be cleaned
with a small paint or flux brush. Do not remove or disturb
balance weights (clips) on blower wheel blades.
8. Vacuum any loose dust from blower housing, wheel and
motor.
9. If a greasy residue is present on blower wheel, remove
wheel from the blower housing and wash it with an appro-
priate degreaser. To remove wheel:
NOTE: Before disassembly, mark blower mounting arms,
motor, and blower housing so motor and each arm is
positioned at the same location during reassembly.
a. Disconnect ground wire attached to blower housing.
b. Remove screws securing cutoff plate and remove
cutoff plate from housing.
c. Loosen set screw holding blower wheel on motor
shaft (160+/−20 in.−lb. when assembling).
d. Remove bolts holding motor to blower housing and
slide motor out of wheel (40+/−10 in.−lb. when reas-
sembling).
e. Remove blower wheel from housing.
f. Clean wheel and housing.
10. Reassemble motor and blower by reversing steps 9a,
through 9e. Be sure to reattach ground wire to the blower
housing.
11. Verify that blower wheel is centered in blower housing and
set screw contacts the flat portion of the motor shaft.
Loosen set screw on blower wheel and reposition if neces-
sary.
12. Spin the blower wheel by hand to verify that the wheel
does not rub on the housing.
13. Reinstall blower assembly in furnace.
14. Reinstall 2 screws securing blower assembly to blower
deck.
15. Reconnect blower leads to furnace control. Refer to fur-
nace wiring diagram, and connect thermostat leads if pre-
viously disconnected.
16. To check blower for proper rotation:
a. Turn on electrical supply.
FILTER TYPE
Washable*
Washable*
Washable*
Washable*
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