Swimming Pool Pump Motors Deconstructed


Pool Pump Motors Deconstructed

Pictured under is the capacitor begin electrical motor, made by AO Smith and others, and used to energy centrifugal impellers on pool pumps. Capacitor-Begin motors use saved powered to provide the motor windings extra energy, to start out the rotor turning.

When this energy is utilized to the coils of wound copper (N) that surrounds the rotor (B), it begins to rotate inside the stator. The rotor is alternately repelled and attracted, and this rapidly ramps up rotor revolutions to over 3400 RPM.

A. Motor Body F. Capacitor Ok. Floor Terminal
B. Rotor and Shaft G. Terminal Board L. Finish Cap
C. Motor Bearings H. Thermal Overload M. Stator
D. Motor Fan I. Centrifugal Begin Change N. Stator
E. Help Body J. Governor

The entire objects on the rear of the motor are replaceable, with the capacitor being essentially the most usually changed motor half. Contained in the motor, the motor bearings might be changed if they start to squeal, though if the motor is over 5 years outdated, it might be higher to switch the motor, in my view. Electrical motors are recyclable, and there’s some scrap worth to the copper windings, if you wish to strip them out.

Studying a Pool Motor Label

A. This line offers you the mannequin variety of the motor, on this case the UST1102. The backwards RU is a UL mark.

B. This line reveals that the motor is thermally protected, after which lists the Thermal Overload half quantity CET51ABM. The CSA emblem is the Canadian Requirements

C. MOTOR MODel quantity is used when changing a motor, to get one with the identical electrical development. Serial Quantity? Not that helpful; it simply tells when it was made.

D. Line D reveals the Volts 115/230, that means this motor has reversible energy, or can settle for both. HP stands for Horsepower, on this case 1.0 hp.

E. AMPS is listed additional down. Additionally on line E is PH for Part, single part on this case. CODE refers back to the NEMA classification for motors.

F. RPM – revolutions per minute, 3450 for pool motor sorts. FR – Body sort, on this case a 56J. HZ stands for Hertz, 60 hz within the US and 50 Hz in different components of the world. VS motors have adjustable, or Variable Speeds, from 600 to 3450 RPM.

G. Max Load Amps lists two numbers 15.0 / 7.5. The primary quantity is max amps used when wired 115V, and the second quantity is amp draw for a 230V hookup. SF stands for Service Issue, and this tells if the motor is uprated, or max-rated. The SF quantity is multiplied by the HP quantity to compute complete horsepower.

H. Insulation Class B is used for many spa and pool motors, AMB lists the utmost ambient temperature this motor ought to function in, 50° Celsius, or 122° Fahrenheit. Time Ranking of CONT signifies that this motor is made for Steady Obligation, or constructed to run on a regular basis, if wanted.

I: Motor TYPE is used to inform the kind of motor used – CS for Capacitor Begin, or UAK for Capacitor Begin/Capacitor Run. The producer Regal Beloit is listed and the nation of development, on this case China, is listed.

The way to Choose a New Pump Motor

The very first thing it is advisable to know is what Body sort you have got. 48Y is commonly referred to as sq. flange, 56J is commonly referred to as C-flange and 48 body are used on spas and above floor pool pumps. After that you just wish to match Horsepower, and Service Issue particularly. You can too use the mannequin quantity to find a substitute pool pump motor.

You can’t Enhance the horsepower of your motor, until you additionally purchase a brand new impeller. Every horsepower has its personal impeller, and Full-rated and Up-rated even have completely different impellers. It’s all the time greatest to put in a precise substitute motor.

If you happen to actually will need to have an even bigger pump, it may be easier to purchase a brand new pump, somewhat than putting in a bigger motor, seal and impeller. And, please make certain your system can deal with extra energy. Putting in a pump that’s too giant for the system (pipes, filter, valves), could cause issues.

For assist deciding on a brand new motor, please be happy to contact our name heart at 800-288-7946, or Go away a Reply under, with all the data in your motor identify plate, and the make and mannequin (and horsepower) of your present pump.

What’s the distinction between Full-Charge and UP-Charge Motors?

An Up-rated motor (aka Max-rated), is when a motor is modified to have a better Service Issue (SF), which will increase the entire horsepower (THP) of the pump. So, an uprated 1.5 hp pump for instance, is a ‘juiced-up’ 1-hp motor, with a better Service Issue, and inside modifications, for a complete horsepower of 1.5 hp.

A full-rated 1.5 hp pump will produce larger circulation charges and better pressures than an up-rated 1.5 hp pump, which may have precise circulation traits nearer to the 1.0 hp mannequin. Up-rated pumps produce much less circulation as the identical horsepower full-rated fashions, however additionally they eat much less vitality and value much less to purchase.

What’s within the Rear of the Motor?

12 o-clock: Thermal Overload Change, a hi-limit that shuts off the pump if it will get too sizzling, turns pump again on as soon as cool.

3 o-clock: Terminal Board, join your two incoming energy leads right here, doesn’t matter which wire goes to which screw. Floor to inexperienced screw.

6 o-clock: Stationary Change, the swap opens when the motor reaches 3450 RPM, to disengage the capacitor energy.

9 o-clock: Capacitor is the beginning battery for the motor, type of like your automotive battery, to supply an help when beginning the motor.

Heart: Governor, aka Centrifugal Change, screwed onto the top of the shaft, is a spring loaded machine that lays flat when 3450 RPM is reached, which opens the Stationary Change, and lower off energy from the Capacitor.


Picture from Pool & Spa Information, article on Bearing Alternative

Can Pool Pump Motors be Rebuilt?

pump shaft sealAfter we discuss a ‘motor rebuild’ for a pool pump, we’re speaking about new bearings (entrance and rear), and a brand new shaft seal (which is technically a pump half).

No one would hassle with bigger motor repairs on residential pool motors, so if there’s a brief throughout the windings, or if the shaft is unbalanced, or the fan vanes damaged, that motor is DOA, when dropped at a motor store.

Sure, you’ll be able to “pull the motor” and drive it over to a neighborhood electrical motor restore store, and they’re going to rebuild it, with new bearings and seal, and likewise examine, clear and tighten, and perhaps even a recent coat of paint. $100-$150. You possibly can normally decide up your rebuilt motor the next day.

You can too rebuild your individual motor, with a pair of bearing pullers and the proper set of entrance and rear motor bearings, and the best shaft seal. You can too discover your whole seals and o-rings for the preferred pool pumps, accessible in our able to go pump rebuild kits.

When you have questions or need assistance with our pool motors and motor components, take an image of the motor nameplate and provides us a name at 800-288-7946. You can too Go away a Reply with your whole identify plate data, and I’m blissful to assist.


Rob Cox
InTheSwim Weblog Editor

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