For some LEED projects that i have been documenting we have DX cooled AHU's with remote condensers.
In order to document the LEED credit i need to know the refrigerant charge in the system. The condensing units need to be field charged with R-134a. Supplier told me roughly 1 lb per ton of cooling.
Is there any way to find out refrigerant charge without busting some serious thermodynamics and tracing the length of piping??? IF i need to bust out some thermo anybody wanna point me in the right direction?