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u3b3rg33k
Forum:
Geothermal & Heat Pumps
12-21-21, 01:12 PM
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How long of a vacuum until braze safely with r290
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4,149
Posted By
u3b3rg33k
to be safe you need to not have air (oxygen) in...
to be safe you need to not have air (oxygen) in the system. you don't need to pull a vacuum at all to braze, just purge with nitrogen. You don't want to be heating propane gas (or compressor oil) to...
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