Replaced pump motor and new one still overheating

amdkennedy

New member
Apr 21, 2018
4
Burnet, Texas
We originally had a Pentair F26/011773 1 1/2 HP motor put in in 2009 wen the pool was built. After some time we had a pool service co replace it and they installed a century 1 1/2 HP motor. It was then replaced with the same Century motor in January 2021. It started shutting down and overheating, pool service said it was not covered under warranty, that rain had gotten into it and shorted things out. That made no sense to me, but we ordered the same pump and had our electrician install it for us. It also continued to overheat and shut down. He replaced the breaker and upgraded the wires, just to ensure it was nothing electrical— no help. We have verified that the skimmer lines and main drain lines have suction. We replaced the 4 cartridge filters and the closure for the filter itself. Still overheating. The pump basket is full and appears to be working fine. The filter pressure is 25 psi when running. The electrician said the motor was pulling too many amps. Can anyone help? There are very few qualified service technicians in my area and we are at our wits end! Thanks so much!
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,321
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
Is the current motor the same THP as the original motor. It sounds like it is not. The impeller is most likely too big for your current motor, causing it to work too hard and overheat.
Post a picture of the label on your current motor. Also the label from the wet end.
I suggest you read ABC's of Pool Water Chemistry.
 

amdkennedy

New member
Apr 21, 2018
4
Burnet, Texas
The first picture is the only label remaining I can see on what I guess you are calling the wet end (The pump water basket portion etc) The second is the pump motor. Thanks for your help!—Angela
 

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JamesW

TFP Expert
Mar 2, 2011
28,209
1627227443044.png
This chart shows you what impeller each pump model number takes.

The below chart shows the total hp that each impeller takes.

Impeller......Total HP.

073126.........0.95
073127.........1.25
073128.........1.65
073129.........2.20
073130.........2.60
073131.........3.45

The total hp is the rated hp x the service factor.

A 1.0 hp motor with a service factor of 1.65 is the same as a 1.5 hp motor with a service factor of 1.1.

A 1.0 hp motor with a service factor of 1.65 is called a "full rated" motor.

A 1.5 hp motor with a service factor of 1.1 is called an "up-rated" motor.

They are both the exact same motor. They both have a total of 1.65 hp.

So, it's confusing to see one listed as 1 hp and the other listed as 1.5 hp.

The key is the total hp, which is what really matters.
 

JamesW

TFP Expert
Mar 2, 2011
28,209
Pentair F26/011773
The WF-26 model WhisperFlo takes a 073128 impeller, which requires 1.65 total hp, which is what the motor is.

So, it should be right, but the impeller might have been replaced.

So, we would need to look at the impeller to see what the part number is.

You can measure the voltage and the amps to see if they are correct.

You can check to see if the motor is set for the correct voltage.

You can try turning the shaft from the back to see if it turns freely or if it seems to be binding.
 

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,729
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
The Pentair F26/011773 1 1/2 HP is a WF-26 which is a 1.5 HP uprated pump so a 1.65 THP motor should be sufficient assuming they never changed the impeller too.
 

JamesW

TFP Expert
Mar 2, 2011
28,209
The filter pressure is 25 psi when running.
Based on the pressure, the impeller is probably bigger than the original.

If they replaced the impeller, it should be on your invoice.

In any case, you will probably need to open it up to check it out.

You can use any of the following impellers.

Unless you need a lot of flow, I would get a 073126 or a 073127.

073126.........0.95
073127.........1.25
073128.........1.65

You should also get a good seal.



 

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JamesW

TFP Expert
Mar 2, 2011
28,209
electrician said 230 volts and at start up pulling 37 amps, then dropping some. I can only assume that it is set at 230V?
37 amps makes no sense. You can't go by startup current.

You need to know the steady current once the pump reaches normal operating speed.

You need to recheck it to see what the steady current is.

Does the shaft turn freely?

What impeller do you have?
 

JamesW

TFP Expert
Mar 2, 2011
28,209
I can only assume that it is set at 230V?
You can't assume, you need to know.

It can be connected to 115 or 230 volts.

You need to know the amperage at normal operation with full prime.

You need to know what impeller you have.

1627238045088.png
 

amdkennedy

New member
Apr 21, 2018
4
Burnet, Texas
Also, impeller not clogged, turns freely when using screwdriver to check it. Don’t think it was ever replaced…the multi function control for the filter is slightly leaking— not a steady drip but..Could that have any bearing?
 
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