Valve placement for heat pump bypass?

brian113

Active member
May 14, 2010
25
Pittsburgh, PA
Hi all,

I'm hoping the hive mind can help with the placement of bypass valve(s) in a system for a new heat pump.

Here's the tentative design. The heater is the blue box on the renderings, the filter is the cylinder and the pump is the rectangular box. My heat pump's installation guide illustrates only one bypass valve, but I'm wondering if multiple valves should be included to prevent water from backflowing into the heat pump — or is that not really a concern?

If multiple valves are recommended, can someone confirm that three would be required? I considered a two-valve (indicated with red Xs on design) design but this would not return only heated water to the pool — a mix of heated/unheated water would be returned. As I see it, a three-valve design (represented by the addition of green X) would be needed to ensure that only heated water return to the pool (with the two red valves open and the green closed).

Any advice would be appreciated.
Pool - view from rear.jpegPool - view from front.jpeg
Pool — valves.jpg
 

brian113

Active member
May 14, 2010
25
Pittsburgh, PA
Thanks, AJW, for both the info and the effort to comment twice as I deleted the old thread and created one in this section.

I'll put the 3-way valve at the junction where the outflow from the filter reaches ground level. That'll eliminate the need for the valve indicated by the green "X."

I was also going to ask if a bypass is recommended for a heater with a titanium rather than copper heat exchanger, but that link makes it clear that the valve would enable the pool to be used if the heater needs to be replaced/repaired, so yeah.

Thanks!