Posted by jtown on January 01, 2000 at 15:58:19:
In Reply to: Knocking inside gas fired boiler posted by Dennis Rockefeller on January 01, 2000 at 15:39:55:
Your air bleeder is not on the extrol itself. It should be mounted on a dedicated pipe rising out of the blr top, or on top of an air separator inline. The expansion tank often happens to mount there also. Your makeup pressure regulator in the make up line from your domestic water has an adjustment screw to set your pressure within the range of the expansion tank. Your shut off might be leaking if you can't get the pressure to drop with it shut. Suspect your gauge also though. You don't want much more pressure than you need to reach the top of your system with a little pressure left there. Pressure doesn't usually make noise. You don't say what it sounds like, popping, banging, rubbing of metal on metal, like it might be a steam bubble in water etc. Is it at light-off? While heating up, When pump starts?, Does it make any when cooling? Has the boiler ever been blown down. You might have a blocked section that is making steam as water can't get to it.
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