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13-08-2008, 12:26 PM #1
UL certificate for heat exchangers
Hi,
One of my customers is building units, to be exported to US.
We deliver components who have a UL certificate. For the condensor (air cooled) he uses a coil comming from an other supplier with copper tubes with a thickness of 0,28 mm; the MWP is (according to the coil supplier) 33 bar.
Now the UL inspector says that to get an UL certificate, a minimum wall thickness of 0,65 bar is required.
Does anyone know if this is correct? Is there a minimal wall thickness requirement in UL? (Or is it a pressure test requirement ...)
Best regards
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13-08-2008, 03:43 PM #2
Re: UL certificate for heat exchangers
Bescie, this is not a real answer to your question but perhaps this can help http://www.ul.com/hvacr/refrigeration/categories.html
I personally think that they only can demand for a pressure test whatever the thickness may be of the copper.It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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