Lennox XC25 – FLUSHING LINE SET

THE LINE SET AND INDOOR UNIT COIL MUST BE FLUSHED WITH AT LEAST THE SAME AMOUNT OF CLEAN REFRIGERANT THAT PRE­VIOUSLY CHARGED THE SYSTEM. CHECK THE CHARGE IN THE FLUSHING CYLINDER  BEFORE PROCEEDING.

A. SET THE RECOVERY MACHINE FOR LIQUID RECOVERY AND START THE RECOVERY MACHINE. OPEN THE GAUGE SET VALVES TO ALLOW THE RECOVERY MACHINE TO PULL A VACU­UM ON THE EXISTING SYSTEM LINE SET AND INDOOR UNIT COIL.

B. INVERT THE CYLINDER OF CLEAN HCFC-22 AND OPEN ITS VALVE TO ALLOW LIQUID REFRIGERANT TO FLOW INTO THE SYSTEM THROUGH THE VAPOR LINE VALVE. ALLOW THE REFRIGERANT TO PASS FROM THE CYLINDER AND THROUGH THE LINE SET AND THE INDOOR UNIT COIL BEFORE IT ENTERS THE RECOVERY MACHINE.

C. AFTER ALL OF THE LIQUID REFRIGERANT HAS BEEN RECOV­ERED, SWITCH THE RECOVERY MACHINE TO VAPOR RECOVERY SO THAT ALL OF THE HCFC-22 VAPOR IS RECOVERED. ALLOW
THE RECOVERY MACHINE TO PULL SYSTEM DOWN TO 0.

D. CLOSE THE VALVE ON THE INVERTED HCFC-22 DRUM AND THE GAUGE SET VALVES. PUMP THE REMAINING REFRIGERANT OUT OF THE RECOVERY MACHINE AND TURN OFF THE MACHINE.