Getting ready to do a solar system, Pentair easy touch upgrade and Pentail Intelliflo XF pump.
The solar plumbing diagrams I have seen show;
from filter –check valve- “T” to bypass and 3 way valve
3 way valve to solar feed and solar return “T”
Bypass to solar return-heater supply “T”
This includes isolation valves BTW
My question is shouldn’t there be a second check valve on the Solar return before the flow hits the first “T” (in flow direction), to keep water from flowing up into the return when the valve is off?
The diagrams that do not use the bypass show the check valve in this location, so what am I missing?