Upon our arrival we removed the failed heat transfer media coil. Installed new heat transfer media coil, new refrigerant pressure control, both drain pans and the filter drier. We purged with nitrogen while brazing, flushed the system with nitrogen to remove all contaminates, pressure tested to 350psi then brought down to a proper vacuum. Once system was under a deep vacuum we introduced new clean refrigerant then ran a performance and safety testing finding the system performing to manufacture specifications at this time.