Need New Pool Pump Motor. Sizing?

[gitar]

Hi all. I have a 18,000G inground vinyl liner pool that I need to replace the motor on. The current motor is a Hayward Super Pump 1hp. It’s on its last legs as it continually trips the breaker and is over 8 years old. The sand filter model is a Hayward S160T with a GPM flow rate of 35 and max working pressure of 50PSI.
Three years ago we had our liner replaced and they cemented and covered the main drain. We now have 1 skimmer and 3 return jets in the pool.
I need to know the size motor I should purchase. It would seem like I could drop down to a Century 3/4 HP motor? I don’t know what else you need to calculate the motor size. I am aware if I change the motor size that I’ll need a new go kit and impeller. Can someone help me get this sized correctly. Thanks

 

[mknauss]

What is the THP of the motor? Post a picture of the motor label. Also any labels on the wet end (pump).

Best option will be a VS motor.

 

[mknauss]

Check what voltage your current motor is running on.

 

[gitar]

What is the THP of the motor? Post a picture of the motor label. Also any labels on the wet end (pump).

Best option will be a VS motor.

Here is the label. Currently running on 115v. I am not looking to spend up to get a VS motor. We will be selling in a few years and need to buy some time. The replacement I’m looking at is linked below. Thoughts??

Century (A.O. Smith) 0.75 HP Up Rate Motor, Round Flange 56J Frame, Single Speed - Model UST1072 - INYOPools.com

Century 3/4 HP Round Flange 56J Up Rate Motor - UST1072

www.inyopools.com

 

[mknauss]

That will work with a smaller impeller.

 

[gitar]

That will work with a smaller impeller.

Will it be adequate for my pool size and sand filter. I’m running 1.5” pipe and I see this stuff online about feet of head etc. I just want to make sure I’ll turn the pool over in 8-10 hrs.

 

[Texas Splash]

That motor might fit and work, but if it were me, I would at least get a 1 - 1.5 HP 2-speed. Running on high (single speed) is such a waste and robs you of your $$$. My Hayward Powerflo uses a similar motor, and I also am currently on 115V, but it's a 2-speed and I leave it on 24/7/365. I know you stated you aren't interested in going the VSP route yet, but you might keep an open mind. Since VSPs are mandatory across most of the US and have been around for a while now, the choices and prices have become quite competitive to standard motors.

I'll tag @1poolman1 though as he might have some additional thoughts.

 

[gullzway]

Here's an option. Just installed this today.

IMPOWR Variable Speed Pool Pump Motor 1.25hp for $125 too risky?

Looking to get a variable speed pump motor to reduce energy costs and possibly keep my pool open through the winter. I already have a Hayward super pump, and an almost new super 2 pump housing so I don't need a pump and motor. I've seen issues with this impower posted and they appear to be out...

www.troublefreepool.com

 

[mas985]

Will it be adequate for my pool size and sand filter. I’m running 1.5” pipe and I see this stuff online about feet of head etc. I just want to make sure I’ll turn the pool over in 8-10 hrs.

Turnovers are irrelevant. Please read this:

Turnover of Pool Water - Further Reading

www.troublefreepool.com

Hi all. I have a 18,000G inground vinyl liner pool that I need to replace the motor on. The current motor is a Hayward Super Pump 1hp. It’s on its last legs as it continually trips the breaker and is over 8 years old. The sand filter model is a Hayward S160T with a GPM flow rate of 35 and max working pressure of 50PSI.
Three years ago we had our liner replaced and they cemented and covered the main drain. We now have 1 skimmer and 3 return jets in the pool.
I need to know the size motor I should purchase. It would seem like I could drop down to a Century 3/4 HP motor? I don’t know what else you need to calculate the motor size. I am aware if I change the motor size that I’ll need a new go kit and impeller. Can someone help me get this sized correctly. Thanks

Why do you want to downsize the motor?

If the old pump worked fine, why not just replace the motor or perhaps you may be able to repair the motor. Usually, motors will trip breakers because the bearings are going out but they can be replaced by a motor shop or yourself if you are handy.

Does the motor squeal or make other loud noises?

Does it trip the breaker when starting or some time after that?

If you are intent of downsizing the motor, then you will also need to downsize the impeller.

Another option is to replace the current motor with a VS motor as shown above although there may be better options. Not as expensive as a new VS pump but will save you money over the long run.