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Air Outlet
Figure 26. Securing Outdoor Unit to Brackets
Refrigerant Piping Connections
Field piping consists of two copper lines connecting the
outdoor unit to the indoor unit. The connections are made
using the provided brass flare nuts at the end of the
refrigerant piping connections.
1. Choose the correct pipe sizes for your application
using "Table 4. Refrigerant Piping and Indoor Unit
Connection Sizes".
2. Confirm that you are using the correct diameter piping.
3. Determine the necessary piping length required for
the application.
4. Cut the selected pipes with a pipe cutter. Make the
cuts flat and smooth as illustrated in "Figure 27.
Cutting Piping".
Figure 27. Cutting Piping
5. Insulate the copper piping.
6. Insert a flare nut onto each pipe before flaring.
7. Use "Table 3. Flaring Pipe" to properly flare the pipe.
Table 3. Flaring Pipe
Flare Dimension
A (mm)
Pipe Diameter
Min
1/4"
8.3
3/8"
12.0
1/2"
15.4
5/8"
18.6
3/4" (22.9)
22.9
6 in
152 mm
Air Inlet
Lean
Crude
Burr
Flare Shape
Max
8.7
- +
90 ° 4
12.4
15.8
A
19.1
R0,4~0,8
23.3
8. After flaring the pipe, temporarily sealed pipe ends
with adhesive tape to avoid contaminants from
entering the pipes.
9. The seal on the unit refrigerant piping connections
should remain in place until the last possible moment.
This will prevent dust or water from getting into the
refrigerant piping before it is connected.
10. CAREFULLY adjust refrigerant piping connections to
suit the application.
11. Slowly loosen one of the flare nuts to release the
factory nitrogen charge from the indoor units only.
12. Remove the flare nuts from the connections on the
unit and discard the seal from each of the piping
connections.
13. Slide the flare nuts onto the ends of the field-provided
refrigerant piping before using a suitable flaring tool to
flare the end of the copper pipe.
14. Apply recommended HFC410A refrigerant lubricant
to the outside of the flared refrigerant lines.
15. Align
the
threaded
flared refrigerant lines. Tighten the flare nuts
lightly at first to obtain a smooth match as
illustrated in "Figure 28. Making Connections
(Male to Female Connection)".
Table 4. Refrigerant Piping and Indoor Unit
Connection Sizes
Size
(Btuh)
9K
12K
18K
24K
A
B
Figure 28. Making Connections
(Male to Female Connection)
16. Once snug, continue another half-turn on each nut
which should create a leakfree joint. A torque wrench
may be used to tighten flare nuts using "Table 5. Flare
Nut Torque Recommendations".
17. After refrigerant piping has been installed and checked
for leaks, apply insulation over all flared connections.
IMPORTANT
Always use two wrenches when tightening flare nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
flare nuts.
11
connections
Liquid Line
Suction Line
in.
in.
1/4
3/8
1/4
1/2
1/4
1/2
3/8
5/8
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
with
the
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