فيديو شرح HVAC 151 Vacuum p18 nitrogen flow with vacuum together ضمن كورس التبريد والتكييف (HVAC) شرح قناة Love2HVAC with Ty Branaman، الفديو رقم 178 مجانى معتمد اونلاين
this is a method of purging nitrogen very slowly while the vacuum pump is operating. this is a bit risky process because too much nitrogen flow can damage the vacuum pump.