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Solar Expansion Tank Questions
I recently purchased a house with a closed loop solar hot water system and am finding myself a bit puzzled by it. I was hoping to get some info about it here.
My main question is about the expansion tank, it's a Solar Extorol S15 (image is attached). There's a temp and pressure gauge on it, but the pressure gauge says 0. I was concerned so I put a gauge on the bottom and it actually does have pressure and guessing the gauge is broken. The gauge on the tank has a red arrow that I assume indicates the psi but it's pointing at 10psi. Would this be correct. The info I found online says it comes precharged at 25psi. How do I determine the correct psi?
Second question is about glycol, there's what seems to be a pressure valve above the tank and it's covered in green stuff, I also notice it's spurting a little when we were running the hot water in the shower, is this normal or a leak? There's a cap on it that was loose, should it be capped or do I just need to tighten the cap to stop the spurting? Also, I don't understand how to fill it with glycol or check the level of the glycol.