Dual Speed Pump overheating?

guest11002

New member
Jul 4, 2023
4
New York, NY
I have a Waterways cartridge filter (installed about 7 years ago) with a 1.5hp, 2 speed pump with a side discharge (to the cartridge filter). The pool is a 15x30 pool. The cartridge is new (installed about 6 weeks ago). Between the pump and the return, there is a Raypak heater, check valve and frog leap.

Recently, when the pump is running on high, it will run and then shut off without warning (the timing it runs varies). When it shuts off, I can flip the speed to low, and after waiting about 10 minutes, I can flip the speed back to high. However, this is short term as it will eventually shut itself off again. The pump will start directly on high. Is this is a symptom of the thermal protection cutting off?

If so, based on the age, does it make sense to replace the motor, or even potentially, the entire pump assembly (including the pre filter basket, etc)? I am considering replacing the entire pre filter as one of the drain plugs leaks and it has been difficult to find a replacement. If so, any recommendations? I am also open to upgrading to variable speed.

Attached are photos of the labels on the pump motor.

(I assume that I do not need to replace the cartridge filter portion since I have no issues with that).
 

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Welcome to TFP! :wave: I had a very similar situation with my Waterway. It ran hot and would shut off on high speed just like you. I suspect it's a sign of worn bearings. Mine also made a high pitched squealing sound at time, but only in cold temps. I think that was a separate issue, so last season I changed the shaft seal which helped with the squeal. I also replaced both of my capacitors just in case. Nowadays, I'm milking this motor for everything it has left. Mine is 9 years old and I run it on low only. High speed just for a quick air purge or something, but never on high for a long time. When I do a digital temp check on the motor casing, sometimes it's hot and other times not so much.

I made a motor replacement thread linked below if you end up going that route. Otherwise a VSP might be a good choice.

 
Thanks! I saw your replacement instructions when I was searching for similar threads with issues and I THINK I can manage swapping out the motor myself. I do not hear any sort of squealing. My assumption would be if there was an issue with a capacitor, it would either not start, or would be more consistent.

I do want to get this fixed (otherwise I would just run it on low) to better distribute heat with the heater, but don't necessarily want to spent too much as we might be doing more major upgrades in the next 2-3 years.

I assume I'm looking for this for a replacement motor? Magnetek Century (A.O. Smith) 1.5 HP Up Rate Thru Bolt Motor, Square Flange 48Y Frame, Dual Speed - Model BN50V1 - INYOPools.com
And I would also want to pick up new seals and o-rings: Aladdin Pentair Dynamo Series, Pac Fab Dynamo Dynamite Pump Seal Kit - Model GOKIT46 - INYOPools.com
 
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Did you check with Inyo to make sure that seal-kit is what you need? Seems to be for a different pump.

Also, while you can use that motor, one size smaller (1 HP uprated) should also work since your original motor is SPL rated (double up rated).


I will double-check to make sure I obtain the correct seal kit, you're correct, it doesn't appear to be the right one.

Today, I ran the pump for 7+ hours on high without it cutting out. The ambient temperature today is much cooler than the last 2-3 times that I observed the pump cutting out.

Can you tell me how to interpret double-up rated vs uprated motors, as I would have never thought that I could use the one you linked. Not questioning - it's obvious you know a lot more than me - but more curious as to how you can tell. Do you compare amps/RPM and identify the lowest HP capable of meeting the RPM, or that operate under the same number of amps? I see articles that you should take HP x Service Factor, but, other than "1.5 HP" SPL on a label (not the actual plate), but the Service Factor seems to be missing on my plate.
 
Since your motor nameplate does not show a HP nor a SF, you really can't use those for sizing. There is a sticker which says the motor is 1.5 HP SPL but that is not really helpful without the SF.

SPL= Special Rating which means it has a SF < 1. However, we don't really know how much less than one.

So another check is to use max amps. Both your old motor and the one I posted have a max amps of 10.8.
 
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