Threads on VS FloPro -- how to attach larger than 2" pipe?

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CA_Tallguy

Active member
Jan 21, 2022
36
Palm Springs
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Can anyone shed some light on plumbing fittings to and from a VS FloPro? I'm new so hopefully this post isn't a FAQ. I tried to search for an answer before posting but could not figure this out.

The pump is VSFHP270JEP -- 2.7 HP VS FloPro Jandy.

The only thing I can find about the pump union fitting is that it is 2" x 2" but the manual and marketing materials seem to suggest that 2" is the minimum pipe size to use with this pump, not the max. On brochure says "recommended pipe size 2in - 3in" and right next to that they say the fitting is 2x2. In the manual, they give input and output stats for pipe going up to 4 inches.

I'd like to try to use 2.5 inch fittings if at all possible to maximize available flow. It appears the inlet/outlet have 2" internal threads but that seems like the most restrictive option of all as the opening is narrowed by the fitting/threads going into it. You gain a few MM with the outside union and leaving that wide open. By chance would the outside of the official jandy tail piece work as 2.5 inch spigot? I just measured the OD of the tail piece currently installed and it is 2-11/16 // 68mm so it isn't 2.5 inch spigot sized (around 2-7/8" or 73mm).

So, it seems like my only option is to try to find a different half union that might connect to 2-1/2 pipe or fittings. Anyone have any ideas on what the outside thread is that the standard union uses?

Thanks in advance for any advice!
 
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Well I think that I just arrived at my own conclusion to this. Pretty simple, actually. Might as well use the factory or equivalent (NOT the internal thread type) because the inside hole on the pump isn't going to get any larger.

The best anyone can do is run larger pipe all the way up to the pump and reduce it down right at the pump where it comes in. I'm not sure how much efficiency gain there might be by running larger than 2" pipe to and from the pump but that's another question. What I'm pondering is building a 2.5 or 3 inch manifold going up to the pump, with separate diverter valves for my pool suction and skimmer suction. (This would be instead of tee'ing them together before a 3-way diverter valve.... so I'd have 2 diverter valve ports feeding pool water to the pump rather than 1.)

This would improve the potential flow right up to the pump, with the limiting factor being the pump inlet and exit ports.
 
The pump inlet and exit port sizes will not be the limiting factor in your flow. The head loss restriction from your filter and heater will limit your flows. The rest are minimal rounding errors.

Tell us what your equipment will be and if you have any water features.
 
Thanks Allen. I have updated my sig with pool details. Unfortunately I couldn't immediately find the specs on the LXI heater we have.

We are replacing some ball valves that are leaking. So while I'm at it, I'm thinking about changing it up to come into the pump with a larger manifold. The main pump is currently fed by a single 2-2.5 inch 3-way diverter valve and the ports on that look pretty small. On one side of the valve is the pool drain and skimmer/cleaner. Spa on the other side. I assume this is how many or most pools are plumbed so it's probably not an issue.

But I was thinking that if I put either the cleaner/skimmer or pool drain into a separate 2 way valve and come in to a larger manifold, then there should be at least 2X the water supply available to the pump when in "pool mode" on the valves. Then I'd be confident that the pump would have an ample supply. But I have a hunch that the current 3-way valve as the sole supply is less than what the pump can handle.

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