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Pressure Test & Isolating Runtal Radiators
I am wondering if anyone here has experience pressure testing a system and isolating Runtal radiators. My system is installed and operating, with a caleffi manifold and 1/2" Fostapex homeruns to each radiator. The radiators have Runtal (Oventrop) thermostatic valves on supply and lock shields on the returns.
When I did a test yesterday, around 50 PSI seemed to open up the closed thermostatic valves and introduce pressure to the radiators (which shouldn't get more than 50-60 PSI) (I could hear them start pinging). Runtal confirmed that the valves will start to lift open at about that pressure and suggested using the plastic shipping caps that come with the valves to hold the pin down and close them off. Oventrop said that might work, but 100 PSI might pop those, too.
Have folks had success with with isolating the Runtal valves under similar circumstances? I'm thinking I might be able to rig something up with a metal nut/cap on the thermostatic valves to hold them closed, but they are threaded M30x1.5 which isn't an easy thing to find. I'm not really worried about leaks---the system held 50 PSI just fine for a few hours with all the valves open. It's just a matter of appeasing the inspector at this point---maybe he'd let me get away with a 50PSI test if I show him the limits on the radiators, but I don't know. I don't really understand why the code requires 100PSI on a system with an operating pressure of 12--20PSI.
Thanks in advance.