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Posted by jtown on March 30, 2004 at 06:46:27:
In Reply to: Re: PRV leaking... posted by Moppo' on March 29, 2004 at 08:37:57:
If the PRV is not leaking until 20psi, I doubt it is bad. CAREFULLY open a blowdown or lift the safety to see if you have high pressure then to check guage. Pressure rises from one or two things. Thermal expansion of the water being heated and/or water leaking in from a bad makeup shutoff or a leak in a domestic hot water coil. Let system cool, bleed all air and get to 12psi. Fire it up and watch pressure guage for a rise getting to full pressure. If it stays fairly steady, shut down after house is good and warm and no one wants hot water for awhile. Watch pressure guage for drop from cooling and then any rise from water leaking in. If the Extrol is large enough, a ripped bladder will still work until the air gets dissolved into the water gradually reducing capacity. That is if the air cannot rise up out of the tank depending on the orientation.