A.O. Smith Century Pool & Spa Motor User Manual

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Installation

Maintenance

S e rv i c e

Troubleshooting

CENTURY®

POOL & SPA MOTOR

MANUAL

INTRODUCTION

elcome to A.O. Smith’s line of Century®

WMotors. This pocket manual is designed for one purpose — to make it simple for you to

install, maintain and troubleshoot Century pool and spa motors. Contrary to what you may be thinking just

now, your last name doesn’t have to be Edison in order to properly service the motors shown in the following pages. All you need are a few basic tools and some helpful hints; the kind that appear throughout this

booklet.

We’ve included all the information we think you’ll need to repair the most common pump motor problems encountered out in the field. This easy to read manual contains great illustrations and diagrams for quick

reference. Assisting your customers is your job. Helping you do that with minimum delay is our job; that’s why we’ve prepared this informative manual.

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Replacements for every brand. Every now and then you probably come across a motor that’s beyond repair. When you do, remember that A.O. Smith manufactures replacement pool and spa motors for practically every brand you’ll ever encounter in the field. So save yourself some time and effort and just ask for Century first — at any A.O. Smith distributor or dealer. Century motors are as rugged as any you’ll find, but keep in mind that all motors need service and maintenance at one time or another.

Safety first. Remember, before you begin to work on any electrical appliance be sure to TURN OFF THE POWER. The only time you’ll need the power on is

when you check motor voltage and amperage. If you overlook this important guideline, someday you could unexpectedly get a real charge out of your work! Always play it safe — double-checkto be certain that the power is off before you start to work on a pool or spa motor.

If you have any suggestions or would like more information about a particular subject, please write or call:

A.O. Smith

531 North Fourth Street

Tipp City, OH 45371

800-543-9450

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TABLE OF CONTENTS

Century Pump Motors ......................................................

5

Design Features................................................................

7

Nameplate Information....................................................

9

Installation

 

Heat..........................................................................

13

Moisture...................................................................

14

Power Source..........................................................

14

Altitude.....................................................................

14

Mounting..................................................................

14

Electrical Connections .............................................

15

Grounding................................................................

15

Wire Size..................................................................

15

Wire Selection Guide.....................................................

16

Tools ................................................................................

17

Maintenance

 

Moisture...................................................................

17

Cooling.....................................................................

18

Seasonal...................................................................

18

Cleaning...................................................................

18

Lubrication...............................................................

18

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Motor Troubleshooting

 

Motor Fails To Start (makes no sound)..................

19

Motor Fails To Start (hums, tries to start,

 

blows fuse or trips breaker)....................................

20

Motor Starts But Shuts Down

 

(overload problem)..................................................

21

Noisy Motor.....................................................................

21

Motor Hot, Smoking Or Cycling ....................................

22

Information Needed For Motor Replacement ..............

23

Troubleshooting A Capacitor .........................................

23

Best Way To Use A Volt-Ammeter.................................

24

How To Replace Bearings..............................................

24

Service ............................................................................

27

Wiring Diagrams’ Table of Contents.............................

28

Wiring Diagrams.......................................................

29-54

Date of Manufacture Table ............................................

55

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CENTURY® CENTURION &

Centurion®,C-flange

Switchless “1081” Motor

Standard Efficiency

E-Plus,High Efficiency

12 – 5 Hp

No Switch, No Governor

Single phase or three phase

Suitable for operation at 50 Hz,

1.0service factor

Aluminum or cast iron NEMA “C” mounting brackets

True NEMA 56-frame

Keyed or threaded shaft

UL standard “1081” approvable

Full-ratedandUp-rated

50° C Ambient

Available as a Century two-speedmotor

Centurion® SE,C-flange

Switchless “1081” Motor

12 – 5 Hp

Standard Efficiency

Single phase

Aluminum NEMA “C”

mounting brackets

50° C Ambient

True NEMA 56-frame

Keyed or threaded shaft

UL Standard “1081” approvable

Full-ratedandUp-rated

303 stainless steel shaft

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E-PLUS® MOTORS

Centurion®, Square Flange

Switchless “1081” Motor

Standard Efficiency

E-Plus,High Efficiency

12 – 5 Hp

No Switch, No Governor

303 stainless steel threaded shaft

Suitable for operation

at 50 Hz, 1.0 service factor

Single or three phase

True NEMA 56-frame

UL standard “1081” approvable

Full-ratedandUp-rated

50° C Ambient

Available as a

Century two-speedmotor

Neptune®, C & Square Flange

Standard Efficiency

High Efficiency

12 – 3 Hp

Advanced Switch Technology

48 frame shell diameter

303 stainless steel threaded shaft

UL standard “1081” approvable

Full-ratedandUp-rated

50° C Ambient

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FLEX-48

POOL AND SPA MOTORS

Flex-48™Single-SpeedMotors,Thru-BoltMount

Suitable for jetted tubs and above-groundpools and spas.

12 - 3 Hp

56-frameconversion base

3-12shaft height

38” threaded shaft

Auto-resetoverload

protection

• 1.0 service factor

Flex-48™Two-SpeedLow Amp Start & Run Motors

For Spas and above-groundpools,thru-boltmount.

34 - 3 Hp

56-frameconversion base

3-12shaft height

38” threaded shaft

Auto-resetoverload

protection

• 1.0 service factor

CENTURION®

DESIGN FEATURES

entury pool and spa pump motors are tailored for

Cdemanding pool loads and environments. Check these outstanding features:

1.Full-rated56-Framediameter gives greater thermal capacity, better durability with industrial quality construction.

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CENTURION®

DESIGN FEATURES

2.All Threaded shafts are 303 stainless steel for superior corrosion resistance. Keyed shaft of carbon steel is iron phosphate treated to prevent rust. Stainless steel shafts provided on cast iron C-flange,keyed shaft product.

3.Double-sealedhigh thrust bearings protect against dirt and moisture. Factory lubricated, never need regreasing.

4. Special aluminum alloy brackets or cast iron NEMA “C”

brackets resist corrosion from pool chemicals.

5.Drive-endbearing locked to limit shaft endplay.

6.Continuous rated run capacitor provides high running efficiency and better starting performance in low voltage situations.

7.Easy connect terminal board is designed with screw post line terminals. All you need is a screwdriver for fast and easy installation wiring.

8.Moisture resistant, Class B insulated windings for extra protection against moisture, high ambient temperatures, salt spray, chemicals, diatomaceous earth, sand, dirt, insects, etc.

9.Motors designed to meet UL Standard #1081, protects internal components from rain, dirt and chemicals.

10.Class B automatic reset overload protector suitable for high ambient temperatures. Prevents nuisance tripping in hot areas.

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NAMEPLATE INFORMATION

hen you need information about the motor

Wyou’re servicing, you’ll always be able to find it printed on the motor nameplate. On A.O. Smith motors the nameplate is usually found on the side of the

motor, below the capacitor. Shown below is a sample pool motor identification nameplate. As you read the nameplate, refer to the guide so that you understand the meaning of each item that the manufacturer provides about its motor. Remember also that your dealer or distributor can give you valuable information that can help you to make the correct selection of a replacement motor.

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