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Author Topic: Circulation pump sounds ugly dry testing... is that right?  (Read 3565 times)

dfavelo

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Circulation pump sounds ugly dry testing... is that right?
« on: November 17, 2012, 12:56:10 pm »
Hello all, new member.  Just was given a free hot tub.  Opened it up, and I have a few things to fix.  When we dry tested the circulation pump, it does not sounds like a nice, smooth pump.  Instead, it sounds a bit clunky.  My father-in-law says that that might be because it is not supposed to dry run.  We're not sure.  A new pump is about $150, but I don't want to spend that yet without being sure.  This is a 1994 sweetwater.  The pump is a Laing SM-909-NHW.
Thank you so much for the help in advance!

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Circulation pump sounds ugly dry testing... is that right?
« on: November 17, 2012, 12:56:10 pm »

Dr. Spa™ Ret.

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Re: Circulation pump sounds ugly dry testing... is that right?
« Reply #1 on: November 17, 2012, 01:44:57 pm »
Running a pump dry can burn up the seals almost instantly. They're water  cooled and water lubricated.
If you can't sell it on eBay, it may not even qualify as landfill.

Retired (mostly) from the industry after 33 years...but still putzing around with a consumer information website, and trying to sell obsolete owners manuals

clover

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Re: Circulation pump sounds ugly dry testing... is that right?
« Reply #2 on: November 22, 2012, 12:40:08 pm »
The pump you are refering to has an impellar that is not driven on a motor shaft, but one that is held in suspension and driven magnetically which is probably the reason for the sound you are hearing.  Make your judgement call after filling the tub and running the pump.
Trying to be the unbaised voice of reason.

Chas

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Re: Circulation pump sounds ugly dry testing... is that right?
« Reply #3 on: November 29, 2012, 01:41:53 pm »
Plus one.


 8)
Former HotSpring Dealer - Southern Cal.

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Re: Circulation pump sounds ugly dry testing... is that right?
« Reply #3 on: November 29, 2012, 01:41:53 pm »

 

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