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IMPORTANT!
The
compressor
in
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.
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).
Table 1. Refrigerant Piping Connections
Size
(Btuh)
VCFA012 & 015
VCFA018 - 054
A
B
Figure 8. Making Connections at Indoor Unit
(Male to Female Connection)
this
unit
contains
Liquid Line
Vapor Line
1/4"
1/2"
3/8"
5/8"
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
8. Once snug, continue another half-turn on each nut
which should create a leak-free joint. A torque wrench
PVE
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.
Always use two wrenches when tightening fl are
nuts to avoid twisting refrigerant piping. DO
NOT over-tighten fl are nuts.
TO INDOOR
UNIT
Figure 9. Tighten Flare Nut
Table 2. Flare Nut Torque Recommendations
Outside
Diameter
Inches
1/4"
3/8"
1/2"
5/8"
9. After refrigerant piping has been installed and checked
for leaks, apply insulation over all fl ared connections.
9
IMPORTANT!
TORQUE WRENCH
TO OUTDOOR UNIT
Recommended
No torque wrench
Torque
available
Finger tighten and
use an appropriately
sized wrench to turn an
additional:
U.S.
15 ft.-lb.
26 ft.-lb.
41 ft.-lb.
48 ft.-lb.
1 full turn
BACKUP
WRENCH
1/4 turn
1/2 turn
7/8 turn
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