VS Motor Replacement for Hayward RS1000 Pump

[Scotland]

Hi all,

I have a Harward RS1000 pump and it currently has a SP US Motors K63CXEPZ-4767 1.5HP 1.3SF motor attached to it.
At the end of last year, the motor started grinding very loud and was leaking too.
I thought about trying to fix it myself but I also just like the idea of getting a new VS motor for it.

I've done some research and these are the things that I think are relevant.

The pool is 40x16 feet and with the sloping etc I estimate it has about 24k gallons.
2-inch pipes so max flow rate of 73GPM.
The filter is a Pentair S7M400 with a max flow rate of 115GPM.
No idea about the length of pipes etc so I don't know our total dynamic head.
I have worked out that it would need 49GPM to turn it over in 8 hours?

All that being true, it looks like I would be able to make do with a 1HP motor, but I'm intending to go to a 1.5HP motor.
When I search Google for a replacement for that pump I get directed to INYOPools.com and the AO Smith V-Green 1.65 HP Round Flange 56J Variable Speed Motor - ECM16CU.

Any thoughts on whether any of my assumptions or calculations are wrong?
Thoughts on that particular motor?
Suggestions for a different motor?
Am I best looking at replacing the full pump?

I've tried to do as much research myself as I can but dny guidance you can give me on this would be great.


Thanks as always.

 

[mas985]

Turnovers are not really relevant to pool maintenance. Most pools require much less than 1 turn per day so targeting a specific turnover rate usually results in excess run time and energy use.

However, the VS pump motor you posted is too small for the current wet end. Your current pump motor appears to be a 1.95 THP motor so you need a motor that is at least as large as that or you will need to reduce the size of the impeller. I think V-Green has a 2.7 THP motor that would work but the 1.65 is too small.

Discontinued V-Green 2.7 HP Round Flange 56J Variable Speed Motor - ECM27CU - INYOPools.com

V-Green 2.7 HP Round Flange 56J Variable Speed Motor - ECM27CU

www.inyopools.com

 

[Scotland]

Turnovers are not really relevant to pool maintenance. Most pools require much less than 1 turn per day so targeting a specific turnover rate usually results in excess run time and energy use.

However, the VS pump motor you posted is too small for the current wet end. Your current pump motor appears to be a 1.95 THP motor so you need a motor that is at least as large as that or you will need to reduce the size of the impeller. I think V-Green has a 2.7 THP motor that would work but the 1.65 is too small.

Discontinued V-Green 2.7 HP Round Flange 56J Variable Speed Motor - ECM27CU - INYOPools.com

V-Green 2.7 HP Round Flange 56J Variable Speed Motor - ECM27CU

www.inyopools.com

Thank you for the reply.
I took the pump apart to check its condition. While it might work fine with a new motor, there were a number of things I noticed which makes me feel more comfortable by just getting a new full pump.

Is there any reason why I wouldn't be able to drop down to 1.5HP with a new pump?
2HP just doesn't feel like it is needed to me...we just need to filter the water and get enough chlorine out of the SWG.

 

[mas985]

While you may not need a higher THP VS pump, there are definitely advantages:

1) Higher THP VS pumps are generally more efficient than lower THP VS pumps at the same flow rate.

2) Higher THP VS pumps can run at lower RPM than lower THP VS pumps for the same flow rate which means they will be much quieter.

3) Higher THP VS pumps use a larger impeller with larger vane separation and therefore less likely to get clogged.

For all of these reasons, I would go with the larger versions of VS pumps (e.g. Intelliflo).