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Mitsubishi Electric PURY-HP72 Service Handbook page 12

R410a
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Table of Contents
Chapter 1
Check Before Servicing
1-1
Preparation for Piping Work ................................................................................................................ 3
1-1-1
Read before Servicing ............................................................................................................................ 3
1-1-2
Tool Preparation ..................................................................................................................................... 4
1-2
1-2-1
Piping Materials ...................................................................................................................................... 5
1-2-2
Storage of Piping Materials..................................................................................................................... 7
1-2-3
Pipe Processing ...................................................................................................................................... 7
1-2-4
Characteristics of the New and Conventional Refrigerants .................................................................... 8
1-2-5
Refrigerant Oil......................................................................................................................................... 9
1-3
Working with Refrigerant Piping ....................................................................................................... 10
1-3-1
Pipe Brazing.......................................................................................................................................... 10
1-3-2
Air Tightness Test ................................................................................................................................. 11
1-3-3
Vacuum Drying ..................................................................................................................................... 12
1-3-4
Refrigerant Charging............................................................................................................................. 14
1-4
Precautions for Wiring ....................................................................................................................... 15
HWE13080
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