Bleeding radiators, no water or air coming out of some

What to do if no water or air comes out when bleeding top floor radiators?
First floor radiators have water but still not warm.
Pressure is typically high in our boiler, old Weill McLain gas, hot water.
Repair people can’t come until next week.
Need tips/trouble shooting.
Thanks

lgwlcvqt

in General Discussion 8 years and 9 months ago

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lgwlcvqt | 8 years and 9 months ago

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Thanks for the help all. I knew it wasn’t a pressure issue as it was registering near 30 psin and this issue had never happened before.
Turns out when a pipe was replaced during the summer, the return pipe was shut and never reopened! Annoying but at least it was a simple fix.

lgwlcvqt | 8 years and 9 months ago

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Thanks for the help all. I knew it wasn’t a pressure issue as it was registering near 30 psin and this issue had never happened before.
Turns out when a pipe was replaced during the summer, the return pipe was shut and never reopened! Annoying but at least it was a simple fix.

dorkofwindsor | 8 years and 9 months ago

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Question – are you opening the water pressure valve in the “fully open” position when bleeding? It needs to be opened, and i believe on the valve it should say what PSI it is regulated for. I am assuming yes because you can just look on youtube at how to do this when bleeding hydronic, and if the answer is “yes” you are doing that then i’d just call master plumber.

eman134 | 8 years and 9 months ago

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If no water or air is coming out of the top floor rads when you attempt to bleed them, then you are most assuredly not getting top floor circulation. As MP said check the pressure against the math.\, though I doubt if your system has suddenly changed from last year. IMHO it is a pump on it’s way to failing and a blown and perhaps undersized expansion tank. If your system is set up correctly, you could purge the air out of the system, but that is best left to a heating pro

Master Plvmber | 8 years and 9 months ago

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It takes 1 psi in the boiler to lift water up 2.31 feet (about 28 inches) into the piping and radiators. Try to figure out how much height there is from the bottom of the boiler to the top of the highest radiator in the system. If that’s, say 30 feet, then divide 30 by 2.31 and get 12.987, or 13 psi. Add another 5 psi for good air removal and inconsistencies in fill valves and 18 psi is a good pressure to work with. Do the same math for 40 feet, etc.
I do this a lot. My résumé here 🙂 : www.72fLLC.com

shahnandersen

in General Discussion 8 years and 9 months ago

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Most likely you need to increase the pressure. How high above the boiler is the top floor? What is the reported pressure when the boiler is at temperature?