Trane MCX512 G1 - Page 13

MS-SVN15B-EN 13
Connection of Refrigerant Tubing
Connection
9. For proper connection, align the union tube and flare tube straight with each other, then
screw in the flare nut lightly at first to obtain a smooth match (Figure 17).
10. Tighten the flare nut to the specified tightening torque with torque wrench and adjustable
wrench (Figure 18).
11. Repeat the process above for the remaining line.
Figure 6.
Figure 7.
Table 1. Flare Nut Tightening Torque
Flare Nut/Piping
Size
Tightening Torque
Kgf, -cm lbf- in
6.35 mm(1/4") dia. 150 200 130 170
9.53 mm(3/8") dia. 350 400 300 340
12.7 mm(1/2") dia. 500 550 430 470
15.88 mm(5/8") dia. 600 650 520 570
Figure 8.
Apply r efrigerant
lubricant her e
Union Flar e nut
Indoor unit
pipe
Wrench
(adjustable)
Torque
wrench
Flar e nut
Connection pipe