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 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.
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 controls. 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 applicability.
Cancels: IIK 340M-40-15 IIK 340M-40-24
11-96
→ Table 1—Kit Usage
MODEL
NUMBER
340MAV
350MAV
490AAV
340MAV
350MAV
490AAV
345MAV A
58MCA
58MXA
58MCA
58MXA
.
58MSA 101
* For 060120 and 120-20size 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.
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.
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.
SERIES USED ON
A
B
C
D
101
111
121
131
All Sizes
All Sizes Except
060120 and 060140*
All Sizes Except
060120*
All Sizes
All Sizes Except
120-20 and 140-20*
All Sizes Except
DESCRIPTION AND USAGE
INSTALLATION
120-20*
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
COMBUSTION-AIR
JUNCTION BOX
CONDENSING
(BEHIND CELL
INLET PANEL)
INDUCER MOTOR
INTAKE
CONNECTION
GAS VALVE
AUXILIARY
VENT OUTLET
HEAT
EXCHANGER
PRESSURE
SWITCH
CONDENSATE
TRAP
MOTOR AND
BLOWER
ASSEMBLY
AIR FILTER AND
RETAINER
BURNER
ENCLOSURE
PRIMARY HEAT
EXCHANGER
(BEHIND CELL
INLET PANEL)
CAP AND
CLAMP
(UNUSED
DRAIN
CONNECTION)
VENT OUTLET
CONTROL
CENTER
BLOWER
ACCESS PANEL
SAFETY
INTERLOCK
SWITCH
A96236
NOTE: Actual component location may vary depending on model
and series.
Fig. 1—Inducer Motor Assembly in Upflow
Furnace Orientation
PAM
RTV
A93081
Fig. 2—Inducer Housing to Collector Box Gasket
11. Remove manifold, orifices, and gas valve as 1 assembly.
12. Remove 4 bolts attaching inducer housing assembly to heat
exchanger cell panel.
Step 2—Install New Motor Assembly
1. Inspect seal on collector box. (See Fig. 2.)
NOTE: If collector box seal is damaged in any way, it must be
repaired. To repair, apply sealant releasing agent such as PAM
cooking spray or equivalent (must not contain corn or canola oil,
aromatic or halogenated hydrocarbons) to inducer housing. Apply
a small bead of G.E. RTV 162, G.E. 6702, or Dow-Corning RTV
738 sealant to groove in collector box. G.E. 162 (P771-9003) is
available through RCD in 3-oz. tubes.
2. Remove 4 bolts and spacers from old inducer housing assembly.
3. Install spacers in new inducer housing.
4. Insert bolts through inducer housing.
NOTE: Inserting bolts at this time will add to the ease of their
installation later.
5. Install new inducer housing assembly to heat exchanger cell
panel by aligning guide pins in collector box.
NOTE: Do not pinch collector box pressure tube when assembling inducer housing to collector box.
6. Tighten 4 bolts securing inducer housing assembly to heat
exchanger cell panel.
7. Remove screw securing capacitor and reuse to secure pressure
switch and capacitor to inducer motor mounting cover plate.
8. Reconnect pressure switch tubes. See tubing label on furnace
for proper connections.
a. Connect tube from burner enclosure and gas valve to
pressure switch.
b. Connect tube from collector box to pressure switch.
→
9. Reconnect motor leads to quick-connect.
10. Reconnect drain tube to inducer motor mounting cover plate.
11. Remove cap and clamp from unused drain connection on old
inducer motor mounting cover plate and install on new inducer
motor mounting cover plate.
12. Reinstall manifold assembly with gas valve to burner box.
Replace mounting screws.
13. Replace burner box cover.
14. Using backup wrench, reconnect gas supply pipe to gas valve
to prevent rotation and improper orientation.
NOTE: Use propane gas resistant pipe dope to prevent gas leaks.
DO NOT use Teflon tape.
Gas valve switch or knob MUST be facing forward or tilted
upward. Failure to follow this warning could result in
property damage, personal injury, or death.
15. Reconnect wires to gas valve. Refer to furnace wiring diagram
for proper wire location.
16. Turn on gas and electrical supplies to unit.
17. Check for gas leaks.
Never use matches, candles, flame, or other sources of
ignition to check for gas leakage. Use a soap-and-water
solution. Failure to follow this warning could result in a fire,
personal injury, or death.
18. Check furnace operation through 2 complete cycles.
19. Reinstall main furnace door.
Copyright 1996 Carrier Corporation 340m4024
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 2 11-96 Replaces: 58M-37SI
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