Refrigerant Pipe Connections - LG MULTI V IV ARUN072BTE4 Installation Manual

• Do not allow the refrigerant to leak during brazing; if the refrigerant combusts, it generates a toxic gas.
• Do not braze in an enclosed location, and always test for gas leaks before / after brazing.
Outdoor Unit Pipe Connections
1. Do not use kinked pipe caused by excessive bending in one specific area on its length.
2. Braze the pipes to the service valve pipe stub of the outdoor unit.
3. After brazing, check for refrigerant gas leaks.
4. When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Selected fittings must also
comply with local, state, or federal standards.
Creating a Flare Fitting
One of the main causes of refrigerant leaks is defective flared con-
nections. Create flared connections using the procedure below.
1. Cut the pipe to length.
• Measure the distance between the indoor unit and the outdoor unit.
• Cut the pipes a little longer than measured distance.
2A. Remove the burrs
• Completely remove all burrs from pipe ends.
• When removing burrs, point the end of the copper pipe down to
avoid introducing foreign materials in the pipe.
2B. Slide the flare nut onto the copper tube.
3. Flaring the pipe end.
• Use the proper size flaring tool to finish flared connections as
shown.
• ALWAYS create a 45° flare when working with R410A.
4. Carefully inspect the flared pipe end.
• Compare the geometry with the figure to the right and dimensions
as detailed in Figure 43.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow clean the pipe with dry nitrogen.
Figure 43: Dimensions of the Flare.
90°
2
A
R=0.4~0.8
reFrIGeraNt PIPING INStaLLatIoN
Table 45: Flared Connection Dimensions.
Pipe
Indoor unit
Vapor (in. Liquid (in.
(Btu/h)
O.D.) O.D.)
≤19,100 1/2
<54,600 5/8
≤76,400 3/4
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.

Refrigerant Pipe Connections

1. Copper
tube
Pipe
2A.
Point
down
3.
Bar
Copper pipe
4.
Smooth
Even length
"A"
Vapor (in.) Liquid (in.)
1/4 5/8 ~ 11/16 7/16 ~ 1/2
3/8 5/8 ~ 11/16 5/8 ~ 11/16
3/8 3/4 ~ 13/16 5/8 ~ 11/16
Slanted Uneven Rough
90°
2B. Flare nut
Copper
Reamer
tube
Handle
Bar
"A"
Yoke
Cone
Clamp handle
Red arrow
Inside is shiny with no scratches
Incorrect Flares
Slanted Damanged Cracked
surface
Uneven
thickness
129