d. If equipped with permanent, washable 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.
e. If equipped with factory-specified disposable media filter,
replace only with media filter having the same part number
and size.
f. Slide filter into cabinet.
g. Replace filter cabinet door.
h. Turn on electrical supply to furnace.
Step 2—Blower Motor and Wheel
The following steps should be performed by a qualified service
technician.
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 2 screws from outer door and then remove outer door.
3. Vent pipe through furnace casing installation only. For down-
flow or horizontal furnaces having vent pipes within the
furnace that pass in from of the blower 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 door and remove blower door.
5. Disconnect blower leads from furnace control. Notice wire
color and location for reassembly.
All other factory wires can be left connected, but field
thermostat connections may need to be disconnected depend-
ing on their length and routing.
6. Remove 2 screws securing control and transformer support to
furnace panel.
7. Hang control and transformer support to front of furnace
casing and away from blower compartment.
8. Remove 2 screws holding blower assembly to blower deck
and slide blower assembly out of furnace.
9. Clean blower wheel and motor using a vacuum with soft brush
attachment. Do not remove or disturb balance weights (clips)
on blower wheel blades. The blower wheel should not be
dropped or bent as balance will be affected.
Fig. 3—Model 58CTS Upflow
A00342
OUTER DOOR
MOUNTING SCREWS
VENT ELBOW
RATING PLATE
DRAFT
SAFEGUARD SWITCH
GAS MANIFOLD
GAS BURNER
FLAME SENSOR
BLOWER DOOR
SAFETY SWITCH
BLOWER, MOTOR
AND CAPACITOR
PRESSURE
SWITCH
FLUE
COLLECTOR
BOX
GAS VALVE
MANUAL RESET
LIMIT SWITCHES
HOT SURFACE
IGNITER
CONTROL
MAIN LIMIT SWITCH
3
