Hello.
I have a two zone, two TACO pump, hydronic gas boiler system with expansion tank. The boiler is probably over 25 years old but I can't afford to replace it this year. The red zone is 30 PSI for the system and my relief valve works, because I've seen it in action. When the system is running I keep the water temp at about 145 Fahrenheit so the pressure stays in the safe zone. If I raise the temp the pressure goes up but I can bleed the system and keep it under 30 PSI at the higher temps, but only for the actual day I bleed it. (BTW-When I do bleed it it's just water that comes out, no air, like it used too.) My guess is that on the overnight when the system is off and the pressure drops and the feed valve puts new water in the system, (I believe it's rated to do so at 15-20psi) which in turn raises the pressure when it's heated in the am. I have a water shut off before and after the feed valve and so my question comes down to this: If I raise the water temp and bleed the system to get the pressure to say 25 PSI, can I safely shut off the intake so no "new" water gets into the system when the pressure drops? What are the dangers of doing so if I go that route? Than you!
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