Piping Connections; Piping Preparation - LG LMCN077HV Installation Manual

PIPING CONNECTIONS

Piping Preparation

Piping Preparation
• Do not allow the refrigerant to leak during brazing; if refrigerant combusts, it generates a toxic gas which can cause physical injury or
death.
• Do not braze in an enclosed location, and always test for gas leaks before / after brazing. Gas leaks can cause physical injury or death.
• After brazing, check for refrigerant gas leaks. Refrigerant gas leaks can cause physical injury or death.
• When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Failure to do so may result in
refrigerant leaks which in turn could result in personal injuries or death from oxygen depletion. Selected fittings must also comply with local,
state, or federal standards.
Note:
1. If piping becomes kinked due to excessive bending, do not use the pipe.
2. Braze the pipes to the service valve pipe stub of the outdoor unit.
Creating a Flare Fitting
Note:
One of the main causes of refrigerant leaks is defective flared connections. Be sure to properly form the flare connections.
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.
• Cut the cable 4.9 ft longer than the pipe length.
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.
• Refer to the diagram in step 3 of Figure 40 and the dimen-
sions in Table 22 for positioning the pipe in the flaring tool.
• ALWAYS create a 45° flare when working with R410A. See
Warning on this page.
4. Carefully inspect the flared pipe end.
• Compare the flare with the illustration in step 4 of Figure
40.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow clean the pipe with dry nitrogen.
Table 22: Flare "A" Measurement.
Pipe Outside
Diameter (inch)
1/4
3/8
1/2
5/8
3/4
32
"A" Measurement
(inch)
0.04 – 0.5
0.06 – 0.7
0.06 – 0.7
0.06 – 0.7
0.07 – 0.8
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.
Figure 40: Creating a Flare Fitting.
Copper
1.
tube
90°
Pipe
2A.
Reamer
Point
down
3.
Bar
Bar
"A"
Copper pipe
Clamp handle
Inside is shiny with no scratches
Smooth
4.
Slanted
Even length
F
MULTI
F
MULTI MAX
Slanted Uneven Rough
2B. Flare nut
Copper
tube
Handle
Yoke
Cone
Red arrow
Incorrect Flares
Damaged Cracked Uneven
surface thickness