8
Flared connections should always be accessible
and must be insulated to prevent condensation.
See Figure 5.
Always use two wrenches when tightening flare
nuts to avoid twisting refrigerant piping. DO NOT
over-tighten flare nuts.
Outside
Diameter
Recommended
Torque
No torque wrench
available
Finger tighten and
use an appropriately
sized wrench to turn an
additional:
Inches
U.S.
1/4”
15 ft.-lb.
1/4 turn
3/8”
26 ft.-lb.
1/2 turn
1/2”
41 ft.-lb.
7/8 turn
5/8”
48 ft.-lb.
1 full turn
Table 2. Flare Nut Torque Recommendations
IMPORTANT
UNIT
BASE
INSULATE ALL FLARED CONNECTIONS
TO PREVENT CONDENSATION
Figure 5. Insulate Flared Connections
IMPORTANT!
Figure 4. Tighten Flare Nut
To Indoor Unit
Torque Wrench
Backup
Wrench
To Outdoor Unit
IMPORTANT
Support ALL piping within 12 in. (305 mm) of any
mechanical fitting such as a flared connection.
