Banjo Bud
Active Member
I’m at my dads house and he has hot water heat. The hot water tank needed a new pressure relief valve so I had to drain a few gallons from the tank to install a new valve. Then of course I had to get air out of the system as i refilled it. I did that by opening the pump at one end. All went well but this small valve atop the expansion valve has me stumped. Am I supposed to open the thumb nut and leave it open or do I keep it tight? Sometimes when I open it a little air comes out but other times nothing comes out. And water never comes out.