Great to find this forum!
I have a solar heated pool with solar powered pool pump, the usual sand filter, chlorinator, etc. Living in the tropics this is all great.
However,the system was installed by a company that is now long gone.
This time of year we find that the pool overheats - getting up to 36 degrees Celsius. We like to keep it at 30-32*C and we set the controller at that temp.
I believe the installer put the 3-way valve in wrongly! I'd like to post a diagram, but don't see how to.
So, my system has the centre pipe of the 3-way connected to the solar panel return. The right port is actually the inlet from the pump (via filter, etc). The left port goes to the solar panels.
When the actuator operates to allow solar heating, the 3-way valve internal gate blocks the center port, forcing water straight through the 3-way valve to the heat collectors and back to the "Tee" and into the pool. This works fine.
But, when the actuator turns the 3-way valve 180 degrees, to what should be "off", the internal gate rests on the vacant space between the left and right port. Now the pump can force water out the left port as well as the centre port. This seems to cause mixing of solar heated water with normally circulating pool water - causing pool temperature to rise continuously.
Any suggestions? Is it possible to reset the position of the internal gate? to what position? Remove and replumb the 3-way valve correctly?
Thanks