11
IMPORTANT!
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrofluorocarbon (HFC) refrigerants, such as R-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.
Nominal
Capacity
(Btuh)
Liquid Line
in.
Vapor Line
in.
7000
9000
12000
15000
18000
1/4
1/2
24000
3/8
5/8
Table 1. Refrigerant Piping Connections
A
B
APPLY REFRIGERANT LUBRICANT
ON THE OUTSIDE OF THE FLARE
MALE FLARE
CONNECTION
Figure 4. Making Connections
(Male to Female Connection)
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 6.
Flared connections should always be accessible
and must be insulated to prevent condensation. See
Figure 6.
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 6. Insulate Flared Connections
IMPORTANT!
Figure 5. 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.
