16
7. Align the threaded connections with the
ared refrigerant lines. Tighten the are nuts
lightly at rst to obtain a smooth match as
illustrated in “Figure 22. Making Connections
(Male to Female Connection)”.
8. Once snug, continue another half-turn on each nut
which should create a leak-free joint. A torque wrench
may be used to tighten are nuts using “Table 3. Flare
Nut Torque Recommendations”. Do not over-tighten
a ared joint. Flared connections should always
be accessible and must be insulated to prevent
condensation.
9. After refrigerant piping has been installed and checked
for leaks, apply insulation over all ared connections.
Table 2. Refrigerant Piping and Indoor Unit
Connection Sizes
Size
(Btuh)
Liquid Line
in.
Suction Line
in.
9000 1/4 3/8
12000 1/4 1/2
18000 1/4 1/2
24000 3/8
5/8
30000 3/8 5/8
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 22. Making Connections
(Male to Female Connection)
IMPORTANT
Always use two wrenches when tightening are nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
are nuts.
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
Figure 23. Tighten Flare Nut
Table 3. Flare Nut Torque Recommendations
Outside
Diameter
Recommended
Torque
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
Inches
1/4 15 ft.-lb. (20 N) 1/4 turn
3/8 26 ft.-lb. (35 N) 1/2 turn
1/2 41 ft.-lb. (56 N) 7/8 turn
5/8 48 ft.-lb. (65 N) 1 full turn
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