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I have a U.S. Boiler independenc steam system and get bad…

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I have a U.S. Boiler...
I have a U.S. Boiler independenc steam system and get bad knocking noises every time it starts. I have tried regularly draining the water but it continues. Any suggestions would be appreciated. Thanks.
Submitted: 2 years ago.Category: HVAC
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Answered in 16 minutes by:
2/16/2016
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
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Satisfied Customers: 3,972
Experience: Experienced in all aspects of HVAC, both residential and commercial.
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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.

Knocking sounds on steam systems are usually caused by the steam and condensate mixing. Your condensate return system may not be working properly.

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Customer reply replied 2 years ago
What is the condensate return system ( presumably just the steam pipes)... how might it not be working properly? Thanks
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Well, steam systems are set up a number of different ways. But usually there are steam traps or some way for the condensate (hot water formed when steam condenses), to get back to the boiler. This system may not be working properly.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

If you have cast iron radiators, there should be a air vent on the radiators. These may not be working properly. This web page explains how these systems work and their components.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

On this page, near the bottom it shows a two pipe system, which most of the newer systems are.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

It shows the way your condensate returns to boiler. This is one possibility why the system may be noisy. The other one is the air scoops.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Does that answer all your questions? This may be something you may have to get a pro involved because these systems take experience to troubleshoot.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Did you have additional questions on this?

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