Carrier 58MCB Service And Maintenance Instruction page 4

PLUG
CAP
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX
TUBE (GREEN)
INDUCER HOUSING
(MOLDED) DRAIN
TUBE (BEHIND
COLLECTOR BOX
DRAIN TUBE)
COLLECTOR BOX
DRAIN TUBE (BLUE)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
COUPLING (LEFT
DRAIN OPTION)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
FIELD-INSTALLED
FACTORY-SUPPLIED
⁄
1
-IN. CPVC STREET
2
ELBOWS (2) FOR
LEFT DRAIN OPTION
→
Fig. 5—Factory-Shipped Upflow Tube
Configuration
(Shown with Blower Access Panel Removed)
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.
3. Disconnect blower motor wires from furnace control. Field
thermostat connections may need to be disconnected depend-
ing 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.
CONDENSATE
TRAP
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
COUPLING (RIGHT
DRAIN OPTION)
A01030
→
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.
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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 capaci-
tor and ground wire attached to blower housing before
removing motor. Motor mounts need not be removed from
motor.
f. Remove blower wheel from housing.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in noise or furnace
component failure.
The blower wheel should not be dropped or bent as balance
will be affected.
g. Clean wheel per instructions on degreaser cleaner. Do not
get degreaser cleaner in motor.
9. Reassemble motor and blower wheel by reversing items 8b
through 8f. Ensure wheel is positioned for proper rotation. Be
sure to reattach ground wire. Tighten setscrew to 140 to 160
in-lb torque.
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NOTE: Be sure to attach ground wire and reconnect blower
harness plugs to blower motor.
10. Reinstall blower assembly in furnace.
11. Reinstall control box, transformer, and door switch assembly
on blower shelf.
12. Reinstall condensate trap and tubing if previously removed.
a. Reinstall condensate trap in hole in blower shelf.
b. Connect condensate trap drain tubes. See Fig. 10 or tubing
diagram on main furnace door for proper tube location.
NOTE: Ensure tubes are not kinked or pinched, as this will affect
operation.
(1.) Connect 1 tube (blue or blue and white striped) from
collector box.
(2.) Connect 1 tube (violet or unmarked) from inducer
housing.
(3.) Connect 1 tube (relief port, green or pink) from
collector box.
c. Connect field drain to condensate trap.
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NOTE: Ensure tubes are not kinked or pinched, as this will affect
operation.
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