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Radiant Heat Leak? / Pressure??
Built a home 5-years ago up in the Colorado Mountains. Cold!
I am concerned about having a leak in the system and why the pressure in the boiler and manifolds drop to zero if you totally isolate them.
Have three loops coming off Buderus G234X-38 boiler.
-1,900 sq. feet / five zones of radiant on main floor
-700 sq. feet / two zones of fintube on second floor
-Expansion Tank is Amtrol Radiant Extrol RX-30.
-Wirsbo hePEX 3/4" and 1/2" tubing
Plumber was totally incompetent. Couldn't tell me capacity of system, amount of tubing used, amount of glycol in system. Lots of other problems throughtout house. Seemed to get everything resolved about two years ago.
We opened autofill about 2-years ago, pressurized system, and turned autofill off. Last year, during winter we were running about 15-16psi with system off (nothing running but waiting for call for heat) and 23psi when system was running everything. This year, we are starting at about 8-9psi off and 21psi when running.
Saturday, I opened autofill and it took about 3-4 seconds to bring pressure to 13psi. Afterwards, 24psi with everything running.
To try to check for leaks, I shutoff system (electrical) and shutoff all valves, except for valve between boiler and expansion tank. Over a couple of hours, pressure dropped in all of the manifolds and eventually hit zero?? Boiler/Ex. Tank pressure held steady at about 16psi. Note - pressure gauge on supply line close to ex. tank.
I then shutoff valve between boiler and ex. tank. Pressure in boiler dropped to zero within 20 minutes. Ex. tank pressure stayed at 16psi. Opened valve - up to 16psi on boiler, closed valve - down to zero?? No visible leaks on any of the components.
Max. boiler temp. goes to 182. Temp. when boiler valve shutoff 120.
Is it normal to drop some pressure in this type of system over a couple of years?
Why is the boiler going to zero?
Any suggestions on how to troubleshoot?