PSC Inducer Motor Kit

Cancels: IIK 340M-40-4 IIK 340M-40-14

11-95

Installation Instructions

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Part No. 317292-753

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 literature, on tags, and on labels attached to unit.

Follow all safety codes. Wear safety glasses and work gloves.

Have a 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 main electrical disconnect is in OFF position. Failure to follow this warning could result in electrical shock, personal injury, fire, or death.

INTRODUCTION

This instruction covers installation of the permanent split capacitor

(PSC) inducer motor kit Part No. 317292-753 for use in condensing gas furnaces. See the appropriate section for details on your furnace model.

Section I: Models 398A, 399A, 58DX, 58DXA, 58DXC, 58SX,

58SXA, and 58SXC; 46-3/16-in. Tall Condensing Gas Furnaces.

Section II: Models 340MAV, 350MAV, 490AAV, 58MCA, and

58MXA; 40-in. Tall Multipoise Condensing Gas Furnaces.

DESCRIPTION AND USAGE

Use this PSC motor kit to repair units with an inducer motor requiring replacement. This kit is designed to allow replacement of inducer motor ONLY.

See Table 1 for kit contents.

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Table 1—Kit Contents

Motor

DESCRIPTION

Capacitor

Slinger Ring*

Foam Rubber Seal*

Harness (Amp Connector)

Harness (Molex Connector)

Moisture Shield

Installation Instructions

PART NO.

HC27CB117

HC91PD001

308146-201

308588-204

320756-301

302755-301

316790-301

IIK 340M-40-14\

58D-11SI

*Parts for use on cover plate Part No. 308118-402 only.

QUANTITY

1

1

1

1

1

1

1

1

INSTALLATION

SECTION I: MODELS 398A, 399A, 58DX, 58DXA, 58DXC,

58SX, 58SXA, AND 58SXC; 46-3/16-IN. TALL

CONDENSING GAS FURNACES

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NOTE: If the inducer cover plate or wheel require replacement, use inducer motor kit Part No. 309868-755.

This kit may be used on furnaces with inducer motor cover plate

Part No. 308118-402, 403, or 405. (See Fig. 1 and 2.) The cover plate part no. is located on motor side of cover plate.

Step 1—Remove Old Motor Assembly

1. Turn off gas and electrical supplies to unit.

2. Remove control access door.

3. Disconnect wiring from motor.

4. Remove screw securing motor ground wire and inducer control box ground wire (when used). The ground screw may be located either on blower shelf or on top mounting bracket of inducer assembly. (See Fig. 3.)

5. Remove screws securing left mounting bracket to collector box and plastic inducer housing.

6. Remove screw securing top mounting bracket to coupling box.

(See Fig. 3.)

7. Remove 8 screws securing plastic cover plate to inducer housing. Remove and save top mounting bracket. (See Fig. 3.)

8. Carefully remove motor assembly from inducer housing.

9. Loosen setscrew in inducer wheel and remove wheel.

NOTE: One of 3 bolts securing motor to the plastic inducer cover plate threads into this plastic plate. Locate and mark this bolt before proceeding.

10. Remove 3 bolts securing motor to inducer cover plate assembly and remove motor.

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. 535-807 Printed in U.S.A.

Form 58D-11SI Pg 1 11-95 Replaces: 58M-18SI

*SLINGER RING

(RUBBER SIDE

TOWARD WHEEL)

1 ⁄

32

″

COVER PLATE

BOLT

(8-14-IN. LB)

RUBBER

GROMMET

INDUCER

WHEEL

WATER

DIVERTER

COVER PLATE

BOLT

(8-14-IN. LB)

RUBBER

GROMMET

INDUCER

WHEEL

SETSCREW

(20-IN. LB)

MOTOR

ARM

*MOTOR

*FOAM RUBBER

SEAL

SETSCREW

(20-IN. LB)

*SHAFT SEAL

MOTOR

ARM

*MOTOR

CRITICAL

DIMENSION;

3 ⁄

8

″

CRITICAL

DIMENSION;

3 ⁄

8

″

* Parts included in kit. Wire adapter not shown.

A95487

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Fig. 1—Inducer Motor Assembly with Cover Plate

308118-402

Step 2—Install New Motor on Cover Plate Part No.

308118-402

1. Remove rubber grommets from old motor and install on new motor.

2. Remove old foam rubber seal from cover plate and install new foam rubber seal.

3. Install new motor on inducer cover plate. (See Fig. 1.) Secure motor with 3 bolts previously removed, ensuring that bolt marked in Step 1, item 10 is used in plastic cover plate hole.

4. Slide slinger ring onto motor shaft with rubber side facing inducer wheel as shown in Fig. 1. Ensure clearance between ring and cover plate is 1/32 in.

5. Position inducer wheel on motor shaft with setscrew on flat portion of shaft. Ensure clearance between wheel and cover plate is 3/8 in. (See Fig. 1.) Tighten setscrew.

6. Ensure cover plate gasket is in good condition and replace if necessary. Install motor/cover plate assembly in inducer housing.

7. Reinstall top mounting bracket on coupling box and inducer housing. Secure ground wire(s) under bracket screw on housing if previous motor was grounded in this manner.

Otherwise, ground motor to blower shelf. (See Fig. 3.)

8. Reinstall left mounting bracket on coupling box and inducer housing. Secure cover plate to inducer housing with remaining screws. (See Fig. 3.)

9. Connect motor lead connector.

2

* Parts included in kit. Wire adapter not shown.

A95488

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Fig. 2—Inducer Motor Assembly with Cover Plate

308118-403 or -405

a. This kit contains a PSC motor and capacitor. Position capacitor in a convenient location using screw to attach securely.

b. Select appropriate wire adapter and connect motor leads to inducer control or furnace wire harness.

10. Turn on gas and electrical supplies to furnace.

11. Check furnace operation through 2 complete cycles.

12. Reinstall control access door.

Step 3—Install New Motor on Cover Plate Part No.

308118-403 or -405

NOTE: Ensure shaft seal in 308118-403 or -405 cover plate is in good condition and seals properly. (See Fig. 2.)

1. Remove rubber grommets from old motor and install on new motor.

2. Remove shaft seal in cover plate.

3. Install new shaft seal in cover plate.

4. Install new motor on inducer cover plate. (See Fig. 2.) Secure motor with 3 bolts previously removed, ensuring that bolt marked in Step 1, item 10 is used in plastic cover plate.

5. Position inducer wheel on motor shaft with setscrew on flat portion of shaft. Ensure clearance between wheel and cover plate is 3/8 in. (See Fig. 2.) Tighten setscrew.

6. Ensure cover plate gasket is in good condition and replace if necessary. Install motor/cover plate assembly in inducer housing.

7. Reinstall top mounting bracket on coupling box and inducer housing. Secure ground wire(s) under bracket screw on

BURNER

ENCLOSURE

GAS VALVE

PRESSURE

SWITCH

TOP MOUNTING

BRACKET

GROUND

WIRE

LEFT MOUNTING

BRACKET

INDUCER WIRE

HARNESS

Fig. 3—Component Location in 46-3/16-in. Tall Condensing Furnace (Upflow Orientation Shown)

A87429 housing if previous motor was grounded in this manner.

Otherwise, ground motor to blower shelf. (See Fig. 3.)

8. Reinstall left mounting bracket on coupling box and inducer housing. Secure cover plate to inducer housing with remaining screws. (See Fig. 3.)

9. Connect motor lead connector.

a. This kit contains a PSC motor and capacitor. Position capacitor in a convenient location using screws to attach securely.

b. Select appropriate wire adapter and connect motor leads to inducer control or furnace wire harness.

10. Turn on gas and electrical supplies to furnace.

11. Check furnace operation through 2 complete cycles.

12. Reinstall control access door.

SECTION II: MODELS 340MAV, 350MAV, 490AAV,

58MCA, AND 58MXA; 40-IN. TALL MULTIPOISE

CONDENSING GAS FURNACES

Step 1—Remove Old Motor Assembly

1. Turn off gas and electrical supplies to furnace.

2. Remove main furnace door.

3. Remove drain tube from inducer motor mounting cover plate.

(See Fig. 4.)

4. Remove pressure switch tubes. (See Fig. 4.) a. Remove 1 tube attached to pressure switch from pressure switch.

3 b. Remove 1 tube attached to pressure switch from burner enclosure and gas valve.

5. Remove wires from pressure switch.

6. Disconnect inducer motor lead connector from control center.

7. Remove inducer motor mounting cover plate from inducer housing by pushing tabs to release. Remove screws next to tabs if used.

8. Loosen setscrew in inducer wheel and remove wheel.

9. Remove 3 bolts securing motor to inducer cover plate and remove motor.

Step 2—Install New Motor Assembly

1. Remove rubber grommets from old motor and install on new motor.

2. Remove shaft seal in cover plate.

3. Install new shaft seal in cover plate.

4. Install new motor on inducer cover plate. (See Fig. 5.) Secure motor to plastic cover plate with 3 bolts previously removed.

5. Position inducer wheel on motor shaft with setscrew on flat portion of shaft. (See Fig. 5.) Tighten setscrew.

6. Install new inducer motor mounting cover plate by locating tabs in retainer slots and pushing until engaged.

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NOTE: If the silicone seal between the inducer cover plate and housing is damaged in any way, it must be repaired. (See Fig. 5.)

To repair, remove old silicone from housing and cover plate.

Apply a small bead of 319946-751, Novagard RTV 400-950, to

COVER SEAL COVER PLATE

BOLT

(8-14-IN. LB)

RUBBER

GROMMET SHAFT

SEAL

COMBUSTION-AIR

INTAKE

CONNECTION

GAS VALVE

AUXILIARY

JUNCTION BOX

VENT OUTLET

CONDENSING

HEAT

EXCHANGER

(BEHIND CELL

INLET PANEL)

PRESSURE

SWITCH

INDUCER MOTOR

BURNER

ENCLOSURE

PRIMARY HEAT

EXCHANGER

(BEHIND CELL

INLET PANEL)

CAP AND

CLAMP

(UNUSED

DRAIN

CONNECTION)

VENT OUTLET

CONTROL

CENTER

CONDENSATE

TRAP

MOTOR AND

BLOWER

ASSEMBLY

BLOWER

ACCESS PANEL

SAFETY

INTERLOCK

SWITCH

AIR FILTER AND

RETAINER

A93454

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Fig. 4—Component Location in 40-in. Condensing

Furnace (Upflow Orientation Shown)

groove in cover plate and reattach to housing. Novagard RTV

400-950 is a low-adhesive silicone sealant and does not require a releasing agent. An alternate method of sealing is to first apply a sealant releasing agent such as PAM cooking spray or equivalent

(must not contain corn or canola oil, aromatic or halogenated hydrocarbons) to inducer housing. Then apply a small bead of G.E.

RTV 162, G.E. RTV 6702, G.E. 6808, or Dow-Corning RTV 738 sealant to groove in cover plate and reattach to housing.

NOTE: Use No. 8 — 18 X 1/2-in. LG thread-cutting screws to secure cover plate to housing, if required.

7. Connect pressure switch tubes. See tubing label on furnace for proper connections.

INDUCER

WHEEL

SETSCREW

(50-IN. LB)

MOTOR

A95489

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Fig. 5—Inducer Motor Assembly with Cover Plate

a. Connect 1 tube from burner enclosure and gas valve to pressure switch.

b. Connect 1 tube from collector box to pressure switch.

8. Reconnect pressure switch wires.

9. Reconnect inducer motor leads to control center.

10. Reconnect drain tube to inducer housing cover.

11. Turn on gas and electrical supplies to unit.

12. Check furnace operation through 2 complete cycles.

13. Reinstall main furnace door.

Copyright 1995 Carrier Corporation 340m4014

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. 535-807 Printed in U.S.A.

Form 58D-11SI Pg 4 11-95 Replaces: 58M-18SI