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Boiler has too much pressure
A have a boiler that is building around 25 psi of pressure and spitting out a little bit of water from the pressure relief valve. The backflow preventer is installed and also the pressure reducing valve (set at 12 psi). The tank (air scoop) has/is known to have the correct pressure (12 psi) and to have no leaks. I followed instructions on how to charge the tank. It was definitely low on air. Now at the right level. The pressure relief valve was changed out about 2 years ago. The pressure at the boiler through another gauge reads 20 psi. The boiler is in the basement. There are 4 pumps. Here the sequence:
1) Pump for radiant heat through the subfloor (about 1000 feet of 3/8" pex) on first floor (covers about) 1,200 square feet
2) Pump for the hot water holding tank (run is about 5 feet supply and return)
3) Pump for the 1st floor (Radiators) only
4) Pump for the 2nd floor (Radiators) only
I read a post somewhere indicating that if you have a 2nd level the psi or pressure will increase from 12 psi to 18 psi and if you have a 3rd floor to about 24 psi reaching my level where I am at?
Questions: Can a backflow preventer be causing too much pressure? Can a pressure reducing valve be causing too much pressure? Can an expansion tank be causing too much pressure?
I do have insurance and the gas company stated that the pressure is normal. Although everywhere I am reading indicates that the pressure should hold between 12 psi-12 psi.
They do cover certain items under the contract if defective and other items are extra. I can order the parts if extra and have a friend install them.
Please advise? Thank you.