Mitsubishi Electric PUHY-HP72 Service Handbook page 10

Chapter 1 Check Before Servicing
1-1 Preparation for Piping Work ................................................................................................................ 1
1-1-1 Read before Servicing ............................................................................................................................ 1
1-1-2 Tool Preparation ..................................................................................................................................... 2
1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil...................... 3
1-2-1 Piping Materials ...................................................................................................................................... 3
1-2-2 Storage of Piping Materials..................................................................................................................... 4
1-2-3 Pipe Processing ...................................................................................................................................... 4
1-2-4 Characteristics of the New and Conventional Refrigerants .................................................................... 5
1-2-5 Refrigerant Oil......................................................................................................................................... 6
1-3 Working with Refrigerant Piping ......................................................................................................... 7
1-3-1 Pipe Brazing............................................................................................................................................ 7
1-3-2 Air Tightness Test ................................................................................................................................... 8
1-3-3 Vacuum Drying ....................................................................................................................................... 9
1-3-4 Refrigerant Charging............................................................................................................................. 10
1-4 Precautions for Wiring ....................................................................................................................... 11
1-5 Cautionary notes on installation environment and maintenance .................................................. 13
HWE18240_GB