Inducer Motor Replacement Kit Installation

Inducer Motor
Replacement Kit
Cancels: IIK 373L-55-5
IIK 373L-55-6
6-98
Installation Instructions
Part No. 318984-753
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained personnel should
install or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning coils or cleaning and replacing filters. All other
operations should be performed by trained service personnel.
When working on heating equipment, observe precautions in the
literature, on tags, and on labels attached to the unit.
Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies a hazard which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
Follow all safety codes. Wear safety glasses and work gloves.
Have a fire extinguisher available.
INTRODUCTION
→ This instruction covers the installation of the inducer motor
replacement kit Part No. 318984-753 in models 373LAD/LAV,
376AAW/BAW/CAV, 383KAD/KAV, 393AAV, 394HAD,
395AAW/BAW/CAV,
396HAD,
480BAV,
481BAV,
58DHB/DHC, 58DFA/GFA, 58PAP/RAP, 58PAV/RAV,
58SC/SSB/SSC, 58WAV/ZAV, 58YAV, GA1AAD, GA2AAD,
GB1AAV, GB3AAV, PG8DAA, and PG8UAA Gas Furnaces.
DESCRIPTION AND USAGE
The inducer motor replacement kit can be used for repairs (or
upgrades) to the inducer motor assembly on ONLY the models
listed in Step 2, item 6.
The inducer motor replacement kit contains the following items:
Inducer Motor Assembly
Harness Adapter (Molex)
Harness Adapter (AMP)
Installation Instructions
1
1
1
1
INSTALLATION
Step 1—Remove Inducer Motor Assembly
1. Set room thermostat to OFF and allow system to complete any
blower off delay.
2. Turn off gas and electrical supplies to unit.
3. Remove blower and control access doors.
4. Unplug inducer motor.
5. Remove 3 assembly mounting screws and remove inducer
motor assembly (motor, wheel, and mount) from inducer
housing. Be careful not to damage inducer wheel during
removal.
6. Measure location of wheel to motor support to use when
reassembling. Using an allen wrench, loosen inducer wheel
setscrew, and remove wheel from motor shaft. (See Fig. 1.)
NOTE: If it is difficult to remove the wheel, lightly sand any
scale or rust buildup from end of motor shaft. Apply a small
amount of penetrating oil to shaft and hub. Tap lightly on hub only.
Do not tap or pry on any other areas of wheel. If the wheel cannot
be removed without damage, a replacement wheel is required.
7. Remove 3 motor grommet screws securing motor plate to
motor support.
8. Remove 2 screws securing motor to motor plate.
Step 2—Install New Inducer Motor Assembly
1. Attach new inducer motor assembly provided in kit to motor
plate using original screws.
2. Attach motor support to motor plate through 3 grommets using
3 original screws. (See Fig. 2.) If there was a shaft seal
between the plate and support, be certain it is moved to the
new assembly. Tighten original screws firmly, but avoid
stripping.
3. Reinstall inducer wheel. Wheel must be located as shown in
Fig. 1. Align flat on shaft to line up with setscrew, then firmly
tighten setscrew.
4. Install inducer motor assembly in inducer housing and fasten
with 3 original mounting screws. Ensure that inducer motor
ground wire is reinstalled under 1 of mounting screws.
NOTE: The 3 original mounting screws are shorter in length than
the other screws. Use of longer screws may result in interference
between the screws and the inducer wheel.
5. After all screws are tightened, spin black plastic cooling fan to
ensure assembly moves freely. If assembly does not spin
freely, remove inducer motor assembly from inducer housing
and verify correct location of inducer wheel on motor shaft.
6. Connect inducer motor to wiring harness. Adapters are included for all applications. Use adapter (if needed) according
to type of connector on original main wiring harness.
For 376AAW/BAW, 395AAW/BAW, 58SC, 58SSB, and
58DHB Furnaces, use adapter with 1/4-in. quick connects and
AMP connector. (See Fig. 3.)
Use the quick Molex adapter for the following models: (See
Fig. 4.)
373LAD Series A and B 373LAV Series A
376CAV Series A and B
383KAD Series A and B
383KAV Series A
394HAD Series A
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 535-705
Printed in U.S.A.
Form 58DFA-20SI
Pg 1
6-98
Replaces: 58DFA-18SI
Tab 6a 8a
395CAV Series A and B
396HAD Series A
GA1AAD Series A
GA2AAD Series A 58DFA Series 101
58DHC All series
58GFA Series 101
58PAP Series 101 and 111
58PAV Series 101
58RAP Series 101 and 111
58RAV Series 101
58SSC All series
No adapter is required for all other models. Connect the
harness directly to the motor. When the connection is complete, discard any unused adapters.
7. Turn on gas and electrical supplies to furnace.
8. Replace blower door to close door interlock switch. With no
call for heat from thermostat, perform self-test on control
board. See instructions on control box or on diagnostic code
label. This will ensure that all components are operational
including the inducer assembly.
9. Operate furnace through 1 complete heating cycle to check for
proper operation.
MOTOR
SUPPORT
SCREW
GROMMET
GROMMET
FERRULE
HEAD
MOTOR
PLATE
GROMMET
FERRULE
HEAD
SETSCREW
MOTOR
PLATE
FAN
MOTOR
SUPPORT
WHEEL BLOWER
MOTOR INDUCER
GROMMET
NOTE: Fan appearance may be different on some furnaces.
NOTE: Fan appearance may be different on some furnaces.
A91210
Fig. 1—Wheel and Setscrew Location
A91211
Fig. 2—Proper Grommet Position
MOLEX
AMP
A92113
Fig. 3—AMP Connector
Copyright 1998 Carrier Corporation
GASKET
SCREW
A92114
Fig. 4—Molex Connector
373l556
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 535-705
Printed in U.S.A.
Form 58DFA-20SI
Pg 2
6-98
Replaces: 58DFA-18SI
Tab 6a 8a