15
8. After refrigerant piping has been installed and checked
for leaks, apply insulation over all fl ared connections.
See Figure 20.
Outside
Diameter
Recommended
Torque
No torque wrench
available
Finger tighten and
use an appropriately
sized wrench to turn
an additional:
Inches
3/8” 26 ft.-lb. (35 N-m) 1/2 turn
3/4” 60 ft.-lb. (81 N-m) 1 turn
Table 2. Flare Nut Torque Recommendations
Figure 20. Insulate Flared Connections
UNIT
BASE
INSULATE ALL FLARED CONNECTIONS
TO PREVENT CONDENSATION
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 18. Making Connections
(Male to Female Connection)
Figure 19. Tighten Flare Nut
6. 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 Figure 19. Do not over-
tighten a fl ared joint. Flared connections should
always be accessible and must be insulated to
prevent condensation.
7. Branch pipe connections may be brazed. It is
necessary to purge the pipes with nitrogen during
brazing to avoid oxidation which may block the
refrigerant piping.
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.
IMPORTANT
Always use two wrenches when tightening fl are
nuts to avoid twisting refrigerant piping. DO
NOT over-tighten fl are nuts.
NOTE - Always slide a fl are nut onto the fi eld-provided
refrigerant piping before fl aring the lines.
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. Remove the fl are nuts from the connections on the
unit and discard the seal from each of the piping
connections.
3. Slide the fl are nuts onto the ends of the fi eld-provided
refrigerant piping before using a suitable fl aring tool to
fl are the end of the copper pipe.
4. Apply recommended R-410A refrigerant lubricant to
the outside of the fl ared refrigerant lines (Figure 18-
A).
5. Align the threaded connections with the fl ared
refrigerant lines. Tighten the fl are nuts lightly at fi rst to
obtain a smooth match (Figure 18-B).
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