1Hp impeller with 1.5hp motor

JohnDib

Member
Apr 18, 2020
13
TX
Hi
I replaced my pool pump couple weeks ago. I recognized that I used 1HP impeller for Century 1.5 HP motor (B2854)
Can I use 1hp impeller with 1.5hp motor. I placed on it the following impeller: 073128, which Is 1Hp full and 1.5 up. Please advise it is ok or I must change. Thank you.
 

JamesW

TFP Expert
Mar 2, 2011
19,425
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.
 

JohnDib

Member
Apr 18, 2020
13
TX
Thank you James for this explanation.
therefore using 073128 impeller for my1.65 total HP capacity should be ok and I do not need 073129.
 

setsailsoon

Gold Supporter
LifeTime Supporter
TFP Guide
Oct 25, 2015
2,983
Stuart/FL
John,

What's the service factor on your pump label? Might be shown as SF. HP x SF = total HP. Then use Jame's chart above. If you have access to a clamp on ammeter you can also check to be sure you're below the rated max amps just to be on the safe side.

Chris
 

JohnDib

Member
Apr 18, 2020
13
TX
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.

Thank you James for this explanation.
therefore using 073128 impeller for my1.65 total HP capacity should be ok and I do not need 073129.
 

JamesW

TFP Expert
Mar 2, 2011
19,425
The 073128 impeller is the correct impeller.

You can't use a bigger impeller (073129) because it will overload the motor.

You can use a smaller impeller if you want to use less power and reduce the flow and pressure in your system.

It's ok, to underload the motor.
 
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setsailsoon

Gold Supporter
LifeTime Supporter
TFP Guide
Oct 25, 2015
2,983
Stuart/FL
If you decide to step up to a VS motor the cheapo way this lesson from James is very helpful. When you go the cheap way like I did with a V-Green motor on an old pump you don't get the advantage of a pump matched to a motor like you do when you buy a new combo such as the Pentair Intelliflo line. But you can match the impeller size you get pretty close for just a few extra $ for the new impeller. After doing this on my pump I found I could run a lower max speed and still get plenty of flow up to the solar panels on the roof... a lot less noisy!
 

JohnDib

Member
Apr 18, 2020
13
TX
The 073128 impeller is the correct impeller.

You can't use a bigger impeller (073129) because it will overload the motor.

You can use a smaller impeller if you want to use less power and reduce the flow and pressure in your system.

It's ok, to underload the motor.
thank you. Appreciate it. Very helpful