Bryant 355MAV User Manual download pdf (Page 4)

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 wires.

All factory wires can be left connected, but field thermostat

connections may need to be disconnected depending on

their length and routing.

4. 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.

f. Remove blower wheel from housing.

g. Clean wheel per instructions on degreaser cleaner. Do

not get degreaser in motor.

9. Reassemble motor and blower wheel by reversing items 8b

through 8f. Ensure wheel is positioned for proper rotation.

Be sure to attach ground wire and reconnect blower harness

plugs to blower motor.

10. Reinstall blower assembly in furnace.

11. 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. 5 or tubing

diagram on main furnace door for proper tube location.

(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.

NOTE: Ensure tubes are not kinked or pinched, as this will affect

operation.

12. Reinstall control box, transformer, and door switch assem-

bly on blower shelf.

13. Reconnect wires.

a. Refer to furnace wiring diagram and connect thermosta

leads if previously disconnected. (See Fig. 17.)

WARNING: ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Blower access panel door switch opens 115-v power to

furnace control. No component operation can occur.

Caution must be taken when manually closing this switch

for service purposes.

14. Turn on electrical supply. Manually close blower access

panel door switch. Use a piece of tape to hold switch closed.

Check for proper rotation and speed changes between

heating and cooling by jumpering R to G and R to Y/Y2 on

furnace control thermostat terminals. (See Fig. 12.)

15. If furnace is operating properly, release blower access panel

door switch, replace blower access panel, and replace main

furnace door.

Fig. 5—Factory-Shipped Upflow Tube

Configuration

(Shown with Blower Access Panel Removed)

A01030

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

⁄2-IN. CPVC STREET

ELBOWS (2) FOR

LEFT DRAIN OPTION

FIELD-INSTALLED

FACTORY-SUPPLIED

DRAIN TUBE

COUPLING (RIGHT

DRAIN OPTION)

CAP

COLLECTOR BOX

DRAIN TUBE (BLUE

& WHITE STRIPED)

PLUG

CONDENSATE

TRAP

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Bryant 355MAV User Manual Page 4

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