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test holes for gas condensing boilers/furnaces
Paul_69
Member Posts: 251
in Gas Heating
When testing gas high eff. units and the manufactuer does not provide a test port,how can you safely drill and plug a hole in venting so it cant blow out fumes/co etc.? In Mass. is there a code against this. Thx in advance
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Comments
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On positive pressure PVC and CPVC exhaust vents, we drill and tap an 1/8" NPT hole and install a brass plug.
On natural draft and induced draft flues, we used to thread in a fat sheet metal screw or cover with aluminum tape, but in Jim's CO class I learned even that is unnecessary.0 -
How long do your brass plugs last with the acidic condensate?0
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One can buy 1/4 PVC threaded plugs but it could be a pain to get. 1/4 inch S/S plugs are what we use.0
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Haven't seen any issues, but they are in a vertical section and not on the side where most of the condensate flows. We'll switch to stainless when the brass ones are gone. It's actually cheaper than brass.bnjmn said:How long do your brass plugs last with the acidic condensate?
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Both RI and Mass allow the use of stainless steel plugs. They want the PVC threaded and RTV sealant used with the plugs. I have a work sheet with a picture just send me an e-mail at gastc@cox.net and I will get it to you.0
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You mean a manufacturer does not supply a place to take the tests they require?0
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Most of the current crop have a test port in the flue fitting/adapter.0
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