17
Refrigerant Piping Connections
Field piping consists of two copper lines connecting the
outdoor unit to the indoor unit. “Table 2. Refrigerant Piping
and Indoor Unit Connection Sizes”lists the connection
sizes. The connections are made using the provided brass
are nuts at the end of the refrigerant piping connections.
Both lines must be individually insulated.
1. 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.
2. CAREFULLY adjust refrigerant piping connections to
suit the application.
3. Slowly loosen one of the are nuts to release the
factory nitrogen charge from the indoor units only.
4. Remove the are nuts from the connections on the
unit and discard the seal from each of the piping
connections.
5. Slide the are nuts onto the ends of the eld-provided
refrigerant piping before using a suitable aring tool to
are the end of the copper pipe.
6. Apply recommended HFC-410A refrigerant lubricant
to the outside of the ared refrigerant lines.
IMPORTANT
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrouorocarbon (HFC) refrigerants, such as HFC-
410A, which this system contains. While it may have
some miscibility properties with mineral-based oil and
POE oil (Polyolester), it is not recommended to mix PVE
oil with any other type of refrigerant oil.
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 27. 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” on page 17
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.
Gas Line
in.
9000 1/4 3/8
12000 1/4 1/2
18000 1/4 1/2
24000 3/8
5/8
36000
48000
3/8 5/8
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 27. 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 28. 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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