7
8. Locate the pre-formed copper connector pipe provided
in the bag assembly. This pipe is used to connect the
cassette piping to the electronic expansion valve.
Remove the plastic seal from each end of the pipe.
9.
Apply a small amount of recommended HFC-410A
refrigerant lubricant to the outside of the flared ends
of the connector.
10. Immediately align the connector pipe with the cassette
base liquid line and the electronic expansion valve
connection labeled “OUTLET.” See Figure 5. Hand-
tighten the flare nuts at first. Then, use two wrenches
to continue to tighten the nuts without twisting the
pipes. See Figure 4. Torque requirements are given
in Table 2.
Again, do not over-tighten the flared
joints.
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.
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
1/2”
41 ft.-lb.
7/8 turn
Table 2. Flare Nut Torque Recommendations
Figure 5. Liquid Line / Expansion Valve Connector
UNIT
BASE
INSULATE ALL FLARED CONNECTIONS
TO PREVENT CONDENSATION
Figure 6. Insulate Flared Connections
11. After refrigerant piping has been installed and checked
for leaks, apply insulation over the connector pipe and
all flared connections.
ELECTRONIC
EXPANSION
VALVE
SIDE VIEW
CONNECTOR
PIPE
OUTLET
INLET
(Connect to refrigerant
piping liquid line)
REFRIGERANT PIPING
CONNECTIONS
(Remove flare nut and
plastic seal immediately
before connecting piping)
Figure 4. Tighten Flare Nut
T o
I n d o o r
Unit
Torque Wrench
Backup
Wrench
To Outdoor Unit
IMPORTANT
Flared connections should always be accessible and
must be insulated to prevent condensation. See Figure
6.
IMPORTANT
Always use two wrenches when tightening flare nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
flare nuts.
IMPORTANT
Support ALL piping within 12 in. (305 mm) of any
mechanical fitting such as a flared connection.
