F80CTL and G80CTL: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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6. Inspect any accessories attached to the furnace such as a humidifier
or electronic air cleaner. Perform any service or maintenance to the
accessories as recommended in the accessory instructions.
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.
Media Cabinet Filter Procedures:
Perform the following procedure to clean or replace a media cabinet
filter:
1. Turn off electrical supply to furnace before removing filter access
door.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable 3/4-in. (19 mm) filter, clean
filter by spraying cold tap water through filter in opposite direction
of airflow. Rinse filter and let dry. Oiling or coating of the filter is
not recommended. See Table 17 for size information.
5. If equipped with factory-specified disposable media filter, replace
only with media filter having the same part number and size. For
expandable replacement media, refer to the instructions included
with the replacement media.
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
Blower Motor and Wheel
To ensure long life and high efficiency, clean accumulated dirt and
grease from blower wheel and motor annually.
The steps given here for the blower motor and wheel should be
performed by a qualified service agency.
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.
NOTE: The blower wheel should not be dropped or bent as balance will
be affected.
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.
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 appropriate degreaser.
NOTE: Before disassembly, mark blower mounting arms, motor, and
blower housing so motor and each arm is positioned at the same location
during reassembly.
To remove wheel:
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 reassembling).
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 necessary.
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 furnace wiring
diagram, and connect thermostat leads if previously disconnected.
16. To check blower for proper rotation:
a. Turn on electrical supply.
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.
Table 17 – Filter Size Information - In. (mm)
FURNACE
CASING WIDTH
FILTER SIZE
FILTER TYPE
SIDE
RETURN
BOTTOM
RETURN
14-1/2 (368)
16 x 25 x 3/4
(406 x 635 x 19)
14 x 25 x 3/4
(356 x 635 x 19)
Washable
*
*. Recommended
17-1/2 (445)
16 x 25 x 3/4
(406 x 635 x 19)
16 x 25 x 3/4
(406 x 635 x 19)
Washable
*
21 (533)
16 x 25 x 3/4
(406 x 635 x 19)
20 x 25 x 3/4
(508 x 635 x 19)
Washable
*
24 (610)
16 x 25 x 3/4
(406 x 635 x 19)
24 x 25 x 3/4
(610 x 635 x 19)
Washable
*
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.
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