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Thread: Need a new motor looking for advice

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    Need a new motor looking for advice

    I want to get a high efficiency motor. I don't know if I should get a 2 speed or variable or 2 speed with timer. Any suggestions are appreciateted. I am pretty handy can I do it my self? When searching for one do I just match frame type HP and voltage? Right now I have the basic one I want a high efficiency one will that be a problem? And do the high efficiency ones really save money?
    Thank you all

    Any reason to try and fix this motor? Maybe needs new copacitors or something should I waste time doing this? Is it easy?

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    22,000 gallons, DE filter, IG pool, plaster/pebble pool

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    BoDarville's Avatar
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    Re: Need a new motor looking for advice

    It's really a judgement call on whether to repair the old motor or get a new one. Will this motor not start? How old is that motor and have you had any recent problems with it prior to the current issue?

    If you decide to replace it and assuming you will keep the pump itself, I would go with a 2-speed of the same Service Factor HP (SFHP) and voltage. SFHP is calculated by taking the HP * the Service Factor. On this motor, it is 1.5 HP * 1 SF = 1.5 SFHP. Installing a motor with a different SFHP will require you to change the impeller of the pump as well. The impeller and motor are designed to work as a cohesive unit. Also be sure to replace the shaft seal whenever you replace the motor.

    And do the high efficiency ones really save money?
    If by "high efficiency" you mean a 2-speed vs. a single-speed, the answer is yes. Depending on how long you run the pump each day and what your electric rates are, you could generate enough savings to pay for the motor in 1-2 years.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    sargent's Avatar
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    Re: Need a new motor looking for advice

    Unless your electricity rates are quite high, you will never recover the additional cost of a variable speed. I don't think you can replace a single speed motor with a variable speed motor. I think you would have to replace the whole pump, and that can be quite expensive. You probably will save money in the long run by getting a two speed motor. Or you could get a standard or energy efficient single speed motor. The two speed motors will use about 1/4 of the energy when it is on low speed of what it uses on high speed. So, if you don't increase the pump run time, you save about 75% of the energy cost. If you get an energy efficient single speed motor, you save on the order of 10-15% of the energy from what a standard single speed motor uses.

    What BoDarville says about the Service Factor is correct. Your existing motor is a 1.5 SFHP motor. The two speed equivalent motor to the UST1152 is a STS1152R, based on the model numbers (But it is a 1.5 hp with SF=1.3, so the SFHP=1.95, so it is really a more "powerful" motor. It is okay to use a motor with a higher SFHP without changing the impeller.). A STS1102RV1 would also work because although it is 1 hp, it has a service factor of 1.5, so the SFHP is 1.5.Here is one site that sells those motors.

    You can use a two speed with just a regular timer that you use with a single speed, but you will need a double throw switch to change from low to high speed.

    If your motor won't start but just sort of hums, the problem could be a capacitor, and it may make sense to just replace that.
    14k gal IG vinyl, Jandy Flopro 1 hp up-rated, 2 spd pump, Hayward 325 sq ft cartridge filter, Circupool Si-40 SWCG

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    Re: Need a new motor looking for advice

    Some areas are giving rebates if you install VS pump. My bill went from $80 to $10 per month after I installed my VS. In the New Orleans area the energy co gave me a $400 check for the install. They also gave the installer $100

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    Re: Need a new motor looking for advice

    I live in south florida and i tried searching for rebates but didn't find any for my area

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    How do I find the shaft seal for my model? Thanks for all the help.
    22,000 gallons, DE filter, IG pool, plaster/pebble pool

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    Re: Need a new motor looking for advice

    Quote Originally Posted by sargent View Post
    Unless your electricity rates are quite high, you will never recover the additional cost of a variable speed. I don't think you can replace a single speed motor with a variable speed motor. I think you would have to replace the whole pump, and that can be quite expensive. You probably will save money in the long run by getting a two speed motor. Or you could get a standard or energy efficient single speed motor. The two speed motors will use about 1/4 of the energy when it is on low speed of what it uses on high speed. So, if you don't increase the pump run time, you save about 75% of the energy cost. If you get an energy efficient single speed motor, you save on the order of 10-15% of the energy from what a standard single speed motor uses.

    What BoDarville says about the Service Factor is correct. Your existing motor is a 1.5 SFHP motor. The two speed equivalent motor to the UST1152 is a STS1152R, based on the model numbers (But it is a 1.5 hp with SF=1.3, so the SFHP=1.95, so it is really a more "powerful" motor. It is okay to use a motor with a higher SFHP without changing the impeller.). A STS1102RV1 would also work because although it is 1 hp, it has a service factor of 1.5, so the SFHP is 1.5.Here is one site that sells those motors.

    You can use a two speed with just a regular timer that you use with a single speed, but you will need a double throw switch to change from low to high speed.

    If your motor won't start but just sort of hums, the problem could be a capacitor, and it may make sense to just replace that.
    Thank you for your reply. So you say if I use the timer i already have installed i would need a double throw switch is that something that has to come separate? And do I buy anyone? Or does it come with it? I saw some that had a timer built in with it.

    I don't hear a humming so I think I'm just goint to go ahead anf replace it.

    IS this one ok? Do i need a timer also?
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    Screenshot_2015-06-17-10-30-08.jpg
    22,000 gallons, DE filter, IG pool, plaster/pebble pool

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    Re: Need a new motor looking for advice

    Does it automatically switch to high output on demand" For example if you have solar panels it needs more power to push it to the roof.
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
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    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    bobodaclown's Avatar
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    Re: Need a new motor looking for advice

    No they don't auto switch. Some solar controllers will offter the option to switch hi/low. You'll need to wire in a switch.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Need a new motor looking for advice

    Good to know. Thanks for that.
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    sargent's Avatar
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    Re: Need a new motor looking for advice

    Quote Originally Posted by mg0698 View Post
    Thank you for your reply. So you say if I use the timer i already have installed i would need a double throw switch is that something that has to come separate? And do I buy anyone? Or does it come with it? I saw some that had a timer built in with it.

    IS this one ok? Do i need a timer also?
    What I did was install a single pole double throw switch in the bottom of my existing timer box. The wire from the timer goes to the center terminal of the switch, and from the switch I have one wire that goes to the high speed terminal of the motor and another wire goes to the low speed terminal of the motor. This is the switch that I have. The switch could be mounted on the motor or in a box near the motor as well. Some people have used a three way light switch mounted in a box to switch from high to low. The switch did not come with the motor.

    Since you already have a timer, you don't need to buy a motor with a timer or to buy another timer. You just need to buy a switch and figure out how to mount it and wire it to the timer and motor.

    That motor looks like the right one, but just to be sure, check that your motor has the same type of mounting flanges that are on that motor. Also make sure your existing motor is wired for 230 V. If all you have is 115 V, that motor is not going to work. Be sure and get a shaft seal.
    14k gal IG vinyl, Jandy Flopro 1 hp up-rated, 2 spd pump, Hayward 325 sq ft cartridge filter, Circupool Si-40 SWCG

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    Re: Need a new motor looking for advice

    I think I'm just going to buy the motor and pay a pool company to do it. I called one company looks like they want around $100. He was not really thrilled about me buying a 2 speed motor. He said it costs more and he isn't sure it's worth it. He said I will have to have the pump running longer. Which doesn't sound right to me.
    22,000 gallons, DE filter, IG pool, plaster/pebble pool

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