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Old 02-12-2008, 09:18 AM   #1
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Heating Pipes knocking


Hello

My Condo has a forced water heating system and when the heat is turned on, it osund like someone is hammering the pipes. what is the cause of this and how can I fix it?

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Old 02-12-2008, 11:29 AM   #2
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Heating Pipes knocking


Look at the gauge on the unit and see what the PSI reading is.
You more than likely have air in the system.

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Old 02-12-2008, 04:19 PM   #3
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Heating Pipes knocking


Water hammer. You can pick up something at the hardware store to fight it. I have never used them and can't recommend any one or if they even work. Talk to a plumber and they should know how to fix it.
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Old 02-12-2008, 06:22 PM   #4
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Heating Pipes knocking


It's not water hammer. Water hammer occurs when the pressure rapidly changes, as in a faucet or washing machine that is turned on then off. I too think there is air in the line somewhere. Does each unit have it's own boiler?
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Old 02-12-2008, 06:48 PM   #5
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Heating Pipes knocking


thanks for the replies. yes, each unit has its own boiler. what is the normal operating pressure on a boiler? if it is air in the system how would i bleed it? i looked at all the baseboards and didn't see any bleed valves. Maybe someway to bleed the system at the boiler itself?
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Old 02-12-2008, 08:00 PM   #6
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Heating Pipes knocking


My boiler usually runs around 18psi at max temp. Keep looking for a bleed valve. It may be on top of the boiler.

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