Identify Plumbing Lines Help

[Scowman]

New house with 20 Year old pool.

Single pump for pool/spa. Extra pumps for waterfall, slillway, spa jets.

I cannot figure out what the purpose of the bypass return line is.

See picture. Return manifold has 5 vertical pipes.

Far right spa retrun

Next to it pump/heater return coming up from ground.

Next to it pool return.

Next to it is a bypass with check valve.

Next to it is pool cleaner. This is the weird bottom of pool pop up heads that rotate. No longer in use.

What i cannot figure ouy is the bypass with check valve. What is the purpose of that?

Thanks

Ken

 

[Scowman]

Ignore the horizontal pipe. That is heater bypass and comes in before the pump/heater return line.

 

[Toxophilite]

I believe that is going to be your spa return bypass/makeup, which allows you to circulate a set amount of pool return to spa while in pool mode, and if utilized, you will get some spillway while in pool mode.

 

[Scowman]

I believe that is going to be your spa return bypass/makeup, which allows you to circulate a set amount of pool return to spa while in pool mode, and if utilized, you will get some spillway while in pool mode.

Thanks for response but i do not think that is possible as it runs from the main return line to the POOL RETURN and not the spa return. Spa return is far right.

 

[Jimrahbe]

S,

Something is not right. So tell us more..

Does your pool have wall returns (Eyeballs).

Does your spa overflow into the pool? If so, I assume this is being caused by your return valve being off-set to allow some water to always go to the spa when in the pool mode.

The 2-way valve being bypassed by the check valve seems to have no value. The 2-way valve does not really do anything as the water will always run through the check valve.

I suspect that the original design has been modified by someone. I suspect that the check valve was originally part of a "make up line" that would have been used to let water go to the spa when in the pool mode. It would have been a check valve in series with a 2-way valve. At some point, it was modified to be useless..

What happens when you adjust or shut off the "by-passed" 2-way valve?

Thanks,

Jim R.

 

[Scowman]

The more i think about it my guess is that it is a bypass for the pop up cleaner return on the far left. The two way shut of f might be too much so a minumum bypass prevents a pressure build up if the valve is fully closed. There is a spa spillway pump so no need for spa bypass. Yes pool eyes.