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Thread: Question about Service Factor

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    rjbeep's Avatar
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    Question Question about Service Factor

    Hi folks,

    Hayward Super II pump motor just gave out and warranty company replaced it.

    The one that died was an AO Smith UST1202 / 2HP with SF 1.1 = 2.2HP, right?
    The one the warranty company provided is a US Motors (Emerson) EUST1202 / 2.0HP with SF 1.0 = 2.0HP, right?

    First question, is difference between old one and new one an issue? (2.2HP versus 2.0HP)

    Second question
    On the new one, the label provides the following info:
    HP 2.0
    SF 1.00
    VOLTS 230/115
    SF AMPS 8.4/16.8
    1.10 SF: 9.7/19.4 AMPS

    It's that last part that confuses me...
    the old motor listed MAX LOAD AMPS = 19.6/10.4-9.8 (115v/208v-230v)

    If I understand the label on the new motor...
    the motor draws 8.4 amps at 230 volts with hp2.0 x sf1.00 = 2hp (less amps than the old motor = better, right?)

    but then the last bit on the new motor label (1.10 SF: 9.7/19.4 AMPS) seems to be saying
    the new motor draws 9.7 amps at 230 volts with hp2.0 x sf1.10 = 2.2hp??? (about the same as the old motor??)

    to add to my confusion, various vendors on the web list this new pump as having an SF = 1.00-1.25???

    Is the Service Factor a variable value?

    My biggest concern is that the new motor is a proper replacement for the previous motor. Seems to me the old motor was 2.2hp and the new one is only 2.0hp, but then the new motor seems to list two different Service Factors? The new motor feels really hot when it is running, but that's probably all in my head. Can't say for sure how hot the old motor felt. Also, the new motor is giving off an odd smell right now, probably because it is new, but another thing making me wonder if there is a problem.

    Any help clearing up my confusion would be greatly appreciated and thanks for suffering through this mess of a post.
    Motor labels included below.

    thanks in advance!
    rjb
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  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
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    Re: Question about Service Factor

    Welcome to TFP!!!

    You understand the the SF correct. The power of the motor is the product of the HP and the SF.

    You are right that if it is a 2.0 SFHP compared to your old 2.2 SFHP, the new pump may be undersized for your impeller and thus will have to work harder and could be hot and not last long.

    As to why there are 2 labels on the new motor with conflicting information ... that I too do not understand. Hopefully someone else will have an idea.
    Jason, TFP Moderator
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    Mod Squad Bama Rambler's Avatar
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    Re: Question about Service Factor

    The label numbers mean that the motor is marketed as a 2.0 sfhp, but it can run as a 2.2 sfhp under max load. Given that, it's and exact replacement for the motor you had.

    Motors tend to run hotter than people think. Can you hold your hand on it for longer than 8 seconds? If so it's not very hot.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    rjbeep's Avatar
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    Re: Question about Service Factor

    thanks Jason and Dave. Appreciate the info!

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    JasonLion's Avatar
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    Re: Question about Service Factor

    The new motor is listed by the manufacturer as a 1 for 1 replacement for the old motor, despite the slightly conflicting specifications.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    rjbeep's Avatar
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    Re: Question about Service Factor

    Quote Originally Posted by JasonLion View Post
    The new motor is listed by the manufacturer as a 1 for 1 replacement for the old motor, despite the slightly conflicting specifications.
    thanks Jason,

    Appreciate the info. Can you point me to where you saw that manufacturer info? Don't doubt you in the least, just curious to see what else is out there.

    thanks again!
    rjb

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    JasonLion's Avatar
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    Re: Question about Service Factor

    If you go to http://www.usmotors.com/online-catalog.aspx and search for a replacement part for a UST1202, it will suggest an EUST1202.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Hayward Pool's Avatar
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    Re: Question about Service Factor

    Love to see great information given on motors. This motor should be just fine.
    Hayward Pool Tech
    80+ Years of Technologically Advanced Pool Product Manufacturing
    poolside@haywardnet.com

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