Flow switch location in sequence

[TDK_WPG]

I just learned of the need for a flow switch - our installer didn't put one in. I've bought one and want to get it in the correct sequence. I understand I need ~12" straight flow ahead of the switch. Is the correct sequence:

1. Heater -> check valve -> flow switch -> SWG -> pool, or
2. Heater -> check valve -> SWG -> flow switch -> pool, or
3. Other?

I've got a fairly straight run from heater to SWG right now, so can likely fit either way. Thanks!

 

[PoolStored]

Doesn't matter. 1 and 2 are both fine. Do you have a by-pass on the heater?

File:Pool Heater Bypass.jpg - Further Reading

www.troublefreepool.com

 

[TDK_WPG]

Thank-you, I do not currently have a by-pass on the heater, however having just read the link you provided, I feel that should be on the menu while I'm doing my re-plumb anyways.

 

[SoCalDIYWannabe]

Depending on the SWCG you have, if it's the basic long tube type, that can act as part of the 12". So, having the sensor after the cell works when you don't have tons of space.
For example if you have a 90, then just enough room for the cell and sensor, then put the cell first, so the sensor has that 12" (from the cell).

 

[Newdude]

our installer didn't put one in

Are you sure ? It would be more complicated to bypass the flow switch than to install it.

Its internal on some cells so you might not see it.

 

[Bob Jakob]

Aquatrol systems do not require a flow switch depending on the set up.

 

[TDK_WPG]

Thanks all, great points - it is indeed an Aquatrol which, if mounted vertically on the return, does not require a flow switch. Unfortunately it has been mounted horizontally, which I now realize is a big no-no without a switch. I'm surprised the installer didn't get something this important right in the first place.