Table 17 – Filter Size Information (In. / Mm)
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| FILTER SIZE |
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FURNACE CASING WIDTH | SIDE |
| BOTTOM | FILTER TYPE |
| RETURN |
| RETURN |
|
16 x25 x 3/4 |
| 14 x25 x 3/4 | Washable* | |
(406 x635 x 19) |
| (356 x635 x 19) | ||
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16 x25 x 3/4 |
| 16 x25 x 3/4 | Washable* | |
(406 x635 x 19) |
| (406 x635 x 19) | ||
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21 (533) | 16 x25 x 3/4 |
| 20 x25 x 3/4 | Washable* |
(406 x635 x 19) |
| (508 x635 x 19) | ||
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24 (610) | 16 x25 x 3/4 |
| 24 x25 x 3/4 | Washable* |
(406 x635 x 19) |
| (610 x635 x 19) | ||
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*Recommended
**Some furnaces may have 2 filters.
CLEANING AND/OR REPLACING AIR FILTER | The inducer and blower motors are | |||
The air filter arrangement will vary depending on the application. | additional lubrication. These motors can be identified by the | |||
absence of oil ports on each end of the motor. | ||||
NOTE: If the filter has an airflow direction arrow, the arrow | ||||
Clean blower motor and wheel as follows: | ||||
must point towards the blower. | ||||
1. Turn off electrical supply to furnace. | ||||
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! | CAUTION |
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| 2. Remove outer door. | |||
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| 3. For downflow or horizontal furnaces having vent pipes | |
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CUT HAZARD |
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| within the furnace that pass in front of the blower access | |
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| door: | ||
Failure to follow this caution may result in personal injury. |
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| a. Disconnect vent connector from furnace vent elbow. | |||
Sheet metal parts may have sharp edges or burrs. Use care |
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| b. Disconnect and remove short piece of vent pipe from | |||
and wear appropriate protective clothing, safety glasses and |
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| within furnace. | |||
gloves when handling parts and servicing furnaces. |
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| 4. Remove 2 screws from blower access door and remove | |||
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| blower access door. |
312AAV
Accessory media cabinet filter procedures:
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
5.If equipped with
6.Slide filter into cabinet.
7.Replace filter cabinet door.
8.Turn on electrical supply to furnace.
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
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.
5.All factory wires can be left connected, but field thermo- stat 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 capacitor wires (if equipped) and 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
d.Remove bolts holding motor to blower housing and slide motor out of wheel
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.
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