Carrier 58MTB - Manual (Page 4)

4
Table 1 – Furnace Air Filter Table
FURNACE CASING WIDTH
IN (MM)
FILTER QUANTITY AND SIZE *
FILTER TYPE* SIDE RETURN *
IN (MM)
BOTTOM RETURN*
IN (MM)
17---1/2 (445)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
3/4” (19 mm) thick washable
21 (533 )
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 20 x 25 x 3/4
(508 x 635 x 19)
3/4” (19 mm) thick washable
24---1/2 (610)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 24 x 25 x 3/4
(610 x 635 x 19)
3/4” (19 mm) thick washable
Table 2 – Air Filter Located in Filter Cabinet
FILTER CABINET HEIGHT --- IN (MM) FILTER SIZE --- IN (MM) FILTER TYPE
16 (406)
(1) 16 x 25 x 3/4*
(406 x 635 x 19) or
(1) 16 x 25 x 4---5/16
(406 x 635 x 110)
Washable
20 (508)
(1) 20 x 25 x 3/4*
(508 x 635 x 19) or
(1) 20 x 25 x 4---5/16
(508 x 635 x 110)
Washable
24 (610)
(1) 24 x 25 x 3/4*or
(610 x 635 x 19) or
(1) 24 x 25 x 4---5/16
(610 x 635 x 110)
Washable
* Filters with a side return--air may have a different filter size. Measure the filter to obtain the correct size.
Step 2 — Blower Motor and Wheel Maintenance
To ensure long life, economy, 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.
The following items should be performed by a qualified service
technician.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
FILTER
FILTER
SUPPORT
FILTER
RETAINER
WASHABLE FILTER OR
DISPOSABLE MEDIA FILTER
IN FILTER CABINET
A08588
Fig. 3 -- Bottom Filter Arrangement
3. Disconnect blower motor wires from furnace control. Field
thermostat connections may need to be disconnected de-
pending on their length and routing.
4. Remove control box mounting screws and position control
box, transformer, and door switch assembly to right side of
furnace casing.
5. If condensate trap is located in left-- or right--hand side of
furnace casing, proceed to item 6, otherwise remove trap
and tubing as described below (See Fig. 5):
a. Disconnect field drain connection from condensate trap.
b. Disconnect drain and relief port tubes from condensate
trap.
c. Remove condensate trap from blower shelf.
6. Remove screws securing blower assembly to blower shelf
and slide blower assembly out of furnace. Detach ground
wire and disconnect blower motor harness plugs from
blower motor.
NOTE: Blower wheel is fragile. Use care.
7. Clean blower wheel and motor by using a vacuum with soft
brush attachment. Be careful not to disturb balance weights
(clips) on blower wheel vanes. Do not bend wheel or blades
as balance will be affected.
8. If greasy residue is present on blower wheel, remove wheel
from the blower housing and wash it with an appropriate
degreaser. To remove wheel:
a. Mark blower wheel location on shaft before disassembly
to ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE: Mark blower mounting arms and blower housing so each
arm is positioned at the same hole location during reassembly.
c. Mark blower wheel orientation and cutoff plate location
to ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoff
plate from housing.
e. Remove bolts holding motor mounts to blower housing
and slide motor and mounts out of housing. Disconnect
capacitor and ground wire attached to blower housing
before removing motor. Motor mounts do not need to
be removed from motor.
f. Remove blower wheel from housing.
58MTB