Pool Pump with different inlet/outlet sizes

Pool Equipment
1

Hi can you please help me with the following:

I bought a used pump to replace my very noisy existing pool pump. Before making the purchase I compared the labels to make sure I was replacing my pump with something compatible.

After I got the pump, side by side to compare, I realized that the inlet and outlet holes of the pump are larger that my current pump i.e. my current pump has 2 in holes and the used newly purchase has 2.5 in holes.

Question:

  1. I’m assuming that I can get 2.5 in to 2.0 in converter/adapters ??

  2. doing the above, can it be problematic ??

I.e. the flow of the water going into the filter ??

Thanks…

2

Hello Mike - Yes, you can use a 2-1/2" x 2" pvc reducer on the ports. Unless you have a really high HP pump motor (>3), you shouldn’t have any problems reducing it down to 2".

3

Thansk Rob…

The replacing pump is 1 HP.

In regards to the HP, I just read and I was wondering if you could clarify something for me:

My current pump is 1 HP with a SF of 1.5 and the used (replacement one) is also 1 HP but with a SF of 1.1.

After reading on your website, it is written that there are 2 categoires for the SF:

= Up rated when SF  is <= 1.27

= Full rated when SF is  > 1.27

My current pump (SF =1.5) would then be a UP Rated and the

Replacement pump (SF = 1.1) would be a FULL Rated.

Knowing the above difference in the current and replacment pump, could it cause issues ??

The 2 pumps have the same frame: 56J, same RPM, same PH, same Duty (CONT)

More info:

- in-ground pool  12’x24’ pool (build in 1984).

  • Hayward pool pump

  • Hayward Sand filter

  • Pool Heater

- Chlorinator

Many thanks…

4

Your old pump was a 1HP uprated model. Your new pump has the higher service factor. This would make it a full rated 1HP pump. Your new one will push a few more gallons per minute but not anything that will damage the system.

5

Thanks for the info…

I now have the newly purchased (USED) pool pump in place and running, big difference as this one is more quieter.

It did not work initially as I noticed that my power supply (from main panel) is 230V and not 115V. The last pump acquired was set (internally) for 115V, therefore from there I reconfigured the pump for a 230V configuration based on pump’s label and it worked. This pump is much quieter than my previous one as I think the bearings needed changing.

I found out that my previous (Very Noisy) pump is more recent than the one I replaced it with. My previous noisy one is 10 years (2008) based on the Serial #.

The newly purchased USED, doesn’t have the sticker with a Serial # but I can tell by the inside wire connections and components that the pump is more than 10 years old.

Having said that, considering the age of the pump, can you please tell me if it is normal that the pump housing is very hot ??

I can touch the housing but I cannot leave my fingers on it as it is too hot.

Previous (10 yo) pump:             HP:  1    SF: 1.5

Last (older than 10 yo) pump:    HP:  1    SF: 1.1

Much appreciated…

6

Hello Mike - It is normal for the motor to be hot to the touch. Check out our video on this subject.