Mitsubishi Electric PUHY-M200YNW-A1 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 Characteristics of the New and Conventional Refrigerants .................................................................... 5
1-2-4 Precautions for handling equipment using R32 ...................................................................................... 6
1-2-5 Refrigerant Oil....................................................................................................................................... 13
1-3 Working with Refrigerant Piping ....................................................................................................... 14
1-3-1 Pipe Brazing.......................................................................................................................................... 14
1-3-2 Air Tightness Test ................................................................................................................................. 15
1-3-3 Vacuum Drying ..................................................................................................................................... 16
1-3-4 Refrigerant Charging............................................................................................................................. 18
1-4 Water piping ........................................................................................................................................ 19
1-5 Precautions for Wiring ....................................................................................................................... 22
1-6 Cautionary notes on installation environment and maintenance .................................................. 24
GB_BS_01_G