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)
To rque
wrench
Flar e nut
Connection pipe
