Hi all, new pool/spa owner here. I figured out the basics of my heating system, only problem is I don't know how to heat my spa without the water overflowing into the pool, causing the pool to heat up and taking the spa a long time to heat up as well. Can anyone help me with my problem? I don't know what any of the switches do asides the red one(gas) and the one labeled pool and spa, (which selects where the water is to be pumped)
PS: I can post more pictures tomorrow if needed(in the light)
Thank you all!