PSC Inducer Motor
Housing Assembly Kit
Installation Instructions
Part No. 320725-753
NOTE: Read the entire instruction manual before starting the
installation.
This symbol →indicates a change since the last issue.
SAFETY CONSIDERATIONS
Installing and servicing 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 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.
Follow all safety codes. Wear safety glasses and work gloves.
Have fire extinguisher available.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the furnace and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER 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.
Before beginning any installation or modification, be sure the
main electrical disconnect switch is in the OFF position.
Electrical shock can cause personal injury or death.
Label all wires prior to disconnection when servicing con-
trols. Wiring errors can cause improper and dangerous
operation.
INTRODUCTION
This instruction covers installation of the permanent split capacitor
(PSC) inducer motor kit Part No. 320725-753 on models
340MAV, 345MAV, 350MAV, 490AAV, 58MCA, 58MSA, and
58MXA Condensing Gas Furnaces. See Table 1 for kit applica-
bility.
DESCRIPTION AND USAGE
Use this PSC inducer motor kit to replace a failed inducer motor
assembly.
This kit contains the following items:
Inducer assembly 1
Installation Instructions 1
NOTE: Inducer assembly consists of motor and fan, capacitor,
wheel, motor mount, inducer cover, inducer housing, vent cap, and
vent clamp.
INSTALLATION
Step 1—Remove Old Motor Assembly
1. Turn off gas and electrical supplies to unit.
2. Remove main furnace door.
3. Remove drain tube from inducer motor mounting cover plate.
4. Remove pressure switch tubes. (See Fig. 1.)
a. Remove tube attached to pressure switch from collector
box.
b. Remove tube attached to pressure switch from burner
enclosure and gas valve.
5. Remove screw securing pressure switch and capacitor to
inducer housing.
6. Disconnect motor lead connector at quick-connect.
7. Using backup wrench, disconnect gas supply pipe from gas
valve.
8. Remove wires from gas valve. Note location for reassembly.
9. Remove burner box cover.
10. Remove screws securing manifold to burner box.
→Table 1—Kit Usage
MODEL
NUMBER SERIES USED ON
340MAV
350MAV
490AAV
A
B
CAll Sizes
340MAV
350MAV
490AAV DAll Sizes Except
060120 and 060140*
345MAV AAll Sizes Except
060120*
58MCA
58MXA
101
111
121 All Sizes
58MCA
58MXA 131 All Sizes Except
120-20 and 140-20*
58MSA 101 All Sizes Except
120-20*
* For 060120 and 120-20 size units on models and series specified, use high
output PSC inducer motor housing assembly kit, Part No. 320725-754. For
060140 and 140-20 size units on models and series specified, use high output
PSC inducer motor housing assembly kit, Part No. 320725-755.
Cancels: IIK 340M-40-15 IIK 340M-40-24
11-96
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. 565-826 Printed in U.S.A. Form 58M-39SI Pg 1 11-96 Replaces: 58M-37SI
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