ICM-2* Motor Conversion Kit
Installation Instructions
Part No. 319345-751 and -752
NOTE: Read the entire instruction manual before starting the
installation.
*Integral Control Motor (ICM-2 denotes second generation).
INTRODUCTION
This instruction covers installation of an ICM-2 Motor Conversion
Kit Part No. 319345-751 and -752 in upflow, gas-fired, variable-
speed condensing furnaces.
NOTE: Due to the reduced accessibility to the filter caused by the
ICM motor on right-side, return-air installations, an accessory side
filter rack may be required to complete the installation.
SAFETY CONSIDERATIONS
Installation and service of 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 and replacing filters. All other operations should
be performed by trained service personnel. When working on
heating equipment, observe precautions in the literature, and on
tags and labels attached to the unit.
Follow all safety codes. Wear safety glasses and work gloves.
Have a fire extinguisher available.
DESCRIPTION AND USAGE
This kit is designed as a service replacement motor (in upflow
furnaces) for a 2-piece, 1/3-hp electronically commutated motor
(ECM) design, or for the first generation of ICM motors utilizing
a square control box attached to the end bell.
Each ICM-2 motor is packaged with a blower door switch (1/2-hp
motor only), several blower adapter harnesses, and a new plug
bracket.
The extra parts supplied with this kit are not required when
servicing models 320AAZ and 58VUA. With exception of the
Installation Instructions, the parts in this kit can be used in
mid-efficiency furnaces that are approved for use with variable-
speed motors. Follow the instructions packaged with the mid-
efficiency furnace accessory kit.
Before beginning any installation or modification, ensure the
main electrical disconnect switch is in the OFF position.
Electrical shock can cause personal injury or death.
INSTALLATION
1. Turn OFF electrical supply to furnace.
2. Remove control and blower access doors.
3. Disconnect 9-pin connector from blower housing.
4. Disconnect thermostat leads and remove control box from
bottom side of blower shelf and position control box to 1 side.
5. Using a back-up wrench, disconnect drain pipe at coupling in
blower compartment.
6. Loosen hose clamp and remove 7/8-in. diameter drain hose
from drain trap.
7. Loosen hose clamp and disconnect 5/8-in. diameter drain hose
at bottom of inducer housing located under blower shelf.
8. Remove drain trap assembly.
9. Remove screws securing blower assembly to blower shelf and
slide assembly out of furnace.
10. 1/3-hp, 2-piece ECM Only:
a. Remove screws securing plug bracket to left side of blower
housing.
b. Disconnect motor connector from blower controller on
back side of blower housing.
c. Remove blower controller and mounting brackets from
back side of blower housing. Discard mounting bracket.
Discard controller, or return it for warranty credit if
applicable.
NOTE: The blower door switch must be replaced with the switch
supplied in the kit when replacing a 2-piece, 1/3-hp ECM motor.
d. Install blower door switch.
The blower door switch must be replaced when converting to
an ICM motor. The new motor in-rush current will damage
the existing blower door switch.
(1.) Remove the auxiliary J-box from the furnace casing.
(2.) Remove auxiliary J-box cover.
(3.) Remove blower door switch from auxiliary J-box and
disconnect both wires. Discard blower door switch
and position wires to 1 side.
(4.) Replace 3/16-in. quick connects with field-supplied,
insulated 1/4-in. quick connects on power leads inside
auxiliary J-box.
(5.) Connect power leads to blower door switch provided
with ICM motor and reinstall switch in auxiliary
J-box.
(6.) Reinstall auxiliary J-box on furnace casing; ensure
mounting screws do not pierce power leads.
(7.) Reinstall auxiliary J-box cover.
11. First generation ICM motors only: Disconnect both connectors
from motor.
12. Loosen setscrew holding blower wheel on motor shaft.
13. Remove bolts holding motor mount to blower housing and
slide motor and mounts out of housing.
Cancels: IIK 398B-60-3 IIK 320A-60-1
7-15-92
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 6a 8a
PC 101 Catalog No. 565-820 Printed in U.S.A. Form 58SXB-19SI Pg 1 7-92 Replaces: 58SXB-10SI
(118 pages)
(16 pages)
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