Purge the entire system to the atmosphere, replace the drier cartridge, and recharge the system with refrigerant.

Secure the system, disassemble and de-ice the thermostatic expansion valve.

Close the king valve, pump down the system, isolate the drier, remove the desiccant core and replace with new drier cartridge.

Using a vacuum pump, draw the entire system down to 1,270 microns for a period of three hours.