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Posted by HeatPro on February 27, 2007 at 21:22:08:
In Reply to: Pressure Relief Valve constantly opening. posted by Jeremy on February 27, 2007 at 15:20:40:
The first problem is that the safety relief valve blows at 5 psig. If you have a PRV on there, it is the wrong valve. A working safety relief valve on a hot water system would pop near 30 psig. A steam relief valve would pop at 15 psig. Whichever system you have they should lift at those pressures and not 5 psig. It is more likely that the pressure gauge is way off and that needs replacement too. Test the pressure with a known-good gauge.
If your system is a steam system, (this is a steam forum) then there wouldn't be an expansion tank in the system.
If your system is a water system then it should never get hot enough to spray steam. The water temperature would have to be over 230F to spray steam from a 5 psig system, which means the high limit would be mis-set.
Whatever the situation, get a pro in there who can tell the difference between a steam system and a water system and know what things should be doing. It isn't a good idea to try to fix a machine you don't have a clue about.
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