Lennox VRF V22B Series Installation Instruction page 7

IMPORTANT
Always use two wrenches when tightening flare nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
flare nuts.
6. Align the threaded connections with the flared
refrigerant lines. Tighten the flare nuts lightly at first to
obtain a smooth match (Figure 3-B).
7. Once snug, continue another half-turn on each
nut which should create a leak-free joint. A torque
wrench may be used to tighten flare nuts using table
2 recommendations. See Figure 4. Do not over-
tighten a flared joint. Flared connections should
always be accessible and must be insulated to
prevent condensation.
Torque Wrench
T o
I n d o o r
Unit
Figure 4. Tighten Flare Nut
Table 2. Flare Nut Torque Recommendations
Outside Recommended
Diameter Torque
Inches U.S.
1/4" 15 ft.-lb.
1/2" 41 ft.-lb.
8. After refrigerant piping has been installed and
checked for leaks, apply insulation over all flared joints
ensuring an air tight seal has been made between unit
connections and field supplied insulated piping. All
field piping connections shall be insulated and air tight
to prevent unwanted condensation build-up. Figure 5.
Backup
Wrench
To Outdoor Unit
No torque wrench
available
Finger tighten and
use an appropriately
sized wrench to turn an
additional:
1/4 turn
7/8 turn
7
IMPORTANT
Flared connections should always be accessible and
must be insulated to prevent condensation. See Figure
5.
INSULATE ALL FLARED CONNECTIONS
TO PREVENT CONDENSATION
UNIT
BASE
Figure 5. Insulate Flared Connections
IMPORTANT
Support ALL piping within 12 in. (305 mm) of any
mechanical fitting such as a flared connection.