Pump sizing question

Njmurvin

Member
Nov 8, 2019
17
Simi Valley, CA
My pool is 35ish years old. It is a very simple SoCal concrete inground pool-only (play pool 3ft-5ft-3ft approx 20K gals) with just an old-school timer box, pump and DE filter (no spa, no heater, no SWG). There are 2 skimmers, split main drains (installed during replaster 2 years ago but are capped off) and a dedicated suction port for "thepoolcleaner". The skimmers (30' and 50' away) share a 2" line while the suction port (40ft away) has its own 1.5" line. They come together at the pool equipment to a valve that "blends" the suction between the two sources. The filter is a Purex stainless steel DE model that is, I believe, 60 sq ft. The filter is original save for replacement grids from time to time. Until recently, I only replaced the pool motors over the years because the brass pump (Aqua Flo)) just kept working. Last time, I went with a refurbished Hayward pump (including wet end) because that's what my home protection insurance provided. I have just replaced the motor's capacitor for the second time now in the past two years. I suspect this may be a warning of impending failure.

I have always gone with 2hp single speed motors because that's what was installed when it was new. I'm sure it was never properly "sized" to my specific configuration. I am guessing 2hp may have been overkill and was probably elected (by me) because it was the biggest and baddest at the time. I am starting to research variable speed pumps. I'm intrigued by the lower cost lines (e.g. Black and Decker) due to their favorable reviews, price, warranty and DIY friendliness. The circuit going to the pool equipment is 220V 15A (which might limit some of the higher output models). Now is my chance to properly size the pump to my application. What say the experts? Or do I need to provide more info?
 
A Variable Speed pump is a variable horsepower pump. You can set the pump speed for the HP needed for different operations. You no longer need to try and guess the correct HP for your pool configuration.

We recommend you get a 3HP pump and then dial it down to whatever speed and HP works best for your pump. Dialing down a large HP pump uses less energy then a smaller HP pump.

Checkout the Circupool 3HP pump which is the same as the B&D pump with a lesser warranty at lower cost.


 
Thanks for the quick response. This is exactly the advice I was looking for. Also, I forgot to mention that I am not really interested in automation other than programming speeds over a time schedule (mainly to provide a few hours of more suction for my cleaner and to completely avoid SCE's peak time 4-9pm rates).
 
Thanks for the quick response. This is exactly the advice I was looking for. Also, I forgot to mention that I am not really interested in automation other than programming speeds over a time schedule (mainly to provide a few hours of more suction for my cleaner and to completely avoid SCE's peak time 4-9pm rates).
You can do that with a VSP as the programming for most (not Jandy) is right in the control on the pump itself. Your time clock would no longer be used.

The Calimar 3hp VSP is the same pump as the Black and Decker (without the gaudy orange) for half the price and will work with your power setup.

Circupool VSP (same pump again) is priced much higher now and the longer warranty is somewhat misleading. The 3 years is on the pump body (which virtually never fails in any pump) but the motor (which is the usual failure point) is only 1 year like the Calimar (same motor).

Of the three mentioned, the absolute best warranty seems to be on the B&D, which appears to be 5 years on everything. And, it comes with its own unions, as does the Circupool.

If you don't have them, you will want to get some 2" high-temp pump unions for the installation of the Calimar if that is purchased. If your plumbing is 1.5," reducer bushings in glued into those unions will get you to the size you need. Don't worry about the smaller PVC plumbing, you adjust the pump speeds for your needs.
 
Another failure point is the vsp control which are effected by lightning storms. A surge protector in the same panel as the pump is wired to will be sufficient.
Surge protector in the panel power line will not protect RS-485 comm lines and chips in the panel or VSP from lighting EMP.
 
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