DC INVERTER U-MATCH AIR CONDITIONERS                                    INSTALLATION 
 
2.5 Installation Clearance Data 
 
Figure 2-5-1 
3 REFRIGERATION PIPING WORK 
3.1 Refrigeration Piping Work Procedures 
1
 Connection Pipe 
  The connection pipe must meet the following requirements. The three basic principles are that the 
pipe shall be kept dry, clean and no leakage
. 
 
Figure 3-1-1 
  Align the flared end of copper pipe with the center of threaded connector and use your hands to 
securely tighten the flared nuts. 
  Tighten the flared nuts with torque wrench, until you hear a ‘KATA” sound from the torque wrench, 
as shown in Fig. 3-1-1. See Table 3-1-1 for the torque required for tightening the nuts.