9
IMPORTANT!
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrofl uorocarbon (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.
Size
(Btuh)
Liquid Line
Vapor Line
VCFA012 & 015
1/4”
1/2”
VCFA018 - 054
3/8”
5/8”
Table 1. Refrigerant Piping Connections
7. Align the threaded connections with the
fl
ared refrigerant
lines. Tighten the
fl
are nuts lightly at
fi
rst to obtain a
smooth match (
fi
gure 8-B).
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 8. Making Connections at Indoor Unit
(Male to Female Connection)
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
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
fl
are nuts using table 2
recommendations. See
fi
gure 7.
Do not over-tighten
a fl 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
fl
ared connections.
IMPORTANT!
Always use two wrenches when tightening fl are
nuts to avoid twisting refrigerant piping. DO
NOT over-tighten fl are nuts.
Figure 9. Tighten Flare Nut
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
