Laserfiche WebLink
The source of most non -condensable• air. Non-condensables will cause higher discharge pressures. <br />Where there is a risJc of freezing, liquid charging of an R-12 refrigeration system should begin with vapor from a vacuum <br />level to a pressure Jf approximately 33 psig. Followed by a liquid charge through the liquid -line service valve. This is <br />,;-'glsd'thd'pr6pe�method to charge a system that contains a large quantity of refrigerant. <br />SAFETY (Additional Safety and shipping information is covered in the core section of this manual.) <br />ASHRAE standard 15 requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in <br />occupied equipment rooms where refrigerant from a leak will concentrate. <br />Refrigerants CFC -12, CFC -1 1, and HFC -134a are categorized as A-1. <br />All refrigeration systems must be protected by a pressure relief valve (s) (must not be installed in series). <br />NEVER energize a reciprocating compressor if the discharge service valve is closed. <br />RECEIVEL <br />MAY 18 2015 <br />ENVIRONMENTAL <br />