Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Will this motor work?

  1. Back To Top    #1

    Will this motor work?

    So for the past couple weeks every time my pump came on it would make a squealing noise that would go away in about 10 seconds, and resume its usual whrring noise. A couple nights ago I woke up to it making the squealing noise non stop. I was thinking the bearings had gone out so I decided to take it apart and run the motor by itself to make sure. Motor running by itself made same squealing.

    So I thought about trying to replace the bearings but I dont have the tools and the motor looks old enough that it should probably just be replaced. So I went to a pool store around here and based on my current motor (B849) and my pump(Sta-rite Dura-Glas) they gave me the AO Smith Magnatek B854. I got home and was looking at the label when I noticed the service factor of the new motor is 1.10. My old motor had a service factor of 1.5. Will this be a problem? I have only owned this house/pool for a couple months so im not even sure if the B849 was the right motor either.

    So how can I tell what motor will be right?
    15000 IG Gunite Plaster
    Hayward DE4820
    1.5 HP Century Centurion
    PB4 3/4 HP Booster Pump
    Polaris 280

  2. Back To Top    #2

    Re: Will this motor work?

    I looked at the impeller part no and here are the specs:

    07 - Sta-Rite Dura/Max-E-Glas Impeller, 0.75 HP Full Rated 1.0 HP Uprated (All Series) (C105-138PEB)

    Is it bad to have a 1.5hp motor with this impeller? Also, is there a 2 speed motor that would operate with this impeller?
    15000 IG Gunite Plaster
    Hayward DE4820
    1.5 HP Century Centurion
    PB4 3/4 HP Booster Pump
    Polaris 280

  3. Back To Top    #3
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: Will this motor work?

    Quote Originally Posted by Jimbrowski
    I looked at the impeller part no and here are the specs:

    07 - Sta-Rite Dura/Max-E-Glas Impeller, 0.75 HP Full Rated 1.0 HP Uprated (All Series) (C105-138PEB)

    Is it bad to have a 1.5hp motor with this impeller? Also, is there a 2 speed motor that would operate with this impeller?
    Something doesn't seem right. The motor you currently have, B849, is a full rated 1.5 HP (1.5 SF) motor but the impeller doesn't seem to match that. Has the motor or impeller ever been replaced?

    Also, do you have the model # of the original pump?

    The pump motor rating can be larger than the impeller rating but not the other way around. The only real downside is the cost of the motor.
    Also, if the impeller really is a 3/4 HP FR impeller, then you should be able to go with a 3/4 HP FR 2 speed motor as well.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

  4. Back To Top    #4

    Re: Will this motor work?

    Quote Originally Posted by mas985
    Something doesn't seem right. The motor you currently have, B849, is a full rated 1.5 HP (1.5 SF) motor but the impeller doesn't seem to match that. Has the motor or impeller ever been replaced?
    I am guessing the motor has been replaced, but not real sure. The previous owner was a real jerk and provided no information.


    Quote Originally Posted by mas985
    Also, do you have the model # of the original pump?
    I only know that it is a dura-glas I (just by looking at it and comparing to pics online). However for the life of me I cant find a model number on the thing. Thats when I started looking at the model number of the impeller to try to figure out what the pump is rated for.

    Quote Originally Posted by mas985
    The pump motor rating can be larger than the impeller rating but not the other way around. The only real downside is the cost of the motor.
    Also, if the impeller really is a 3/4 HP FR impeller, then you should be able to go with a 3/4 HP FR 2 speed motor as well.
    [/quote]

    I was looking through the manual and found something interesting. They listed that same impeller part for pumps ranging from .5 to 1.5 HP.

    http://www.staritepool.com/pdfs/DuraGlasOM.pdf

    Im still a little confused about the 2 speed motor part. Let say this is a 3/4 HP impeller.... can I run a 3/4 HP pump at half speed? Seems like it would need to be at full speed for it to have the power to rotate the impeller properly.
    15000 IG Gunite Plaster
    Hayward DE4820
    1.5 HP Century Centurion
    PB4 3/4 HP Booster Pump
    Polaris 280

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: Will this motor work?

    I think Sta-Rite is playing some games with their pump ratings and service factors. If you look at the max amps for all the pumps that use that impeller, they are all the same so they are all the same motor rating. I cross referenced the motors that are paired with that impeller and they are:

    3/4 HP SF 1.65
    1 HP SF 1.25
    1.5 HP SF ?? (no cross reference but I suspect the SF is less than 1.0)

    So I believe that you are safe going with a 3/4 HP 1.65 SF or a 1 HP SF 1.25 two speed motor.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

  6. Back To Top    #6

    Re: Will this motor work?

    Depending on the price of the 2 speed, I may just go with the B854 that they gave me. Do you see any problem with it, other than inefficiency?
    15000 IG Gunite Plaster
    Hayward DE4820
    1.5 HP Century Centurion
    PB4 3/4 HP Booster Pump
    Polaris 280

  7. Back To Top    #7
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: Will this motor work?

    A little over dimensioned, but so was the last motor and it shouldn't be all that more inefficient. Motors are fairly efficient over a wide range of loads.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •