Piping Preparation - LG Art Cool Premier LA120HYV1 Installation Manual

GENERAL INSTALLATION GUIDELINES

Piping Preparation

Piping Preparation
WARNING
• Do not allow the refrigerant to leak during brazing; if the refrigerant combusts, it generates a toxic gas that can cause serious bodily
injury or death.
• Do not braze in an enclosed location, and always test for gas leaks before/after brazing. Trapped gas from enclosed locations can lead
to bodily injury or death.
Single Zone 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.
Creating a Flare Fitting
One of the main causes of refrigerant leaks is defective flared
connections. Create flared connections using the procedure shown in
Figure 17.
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.
• ALWAYS create a 45° flare when working with R410A.
See WARNING on this page.
4. Carefully inspect the flared pipe end.
• Compare the geometry with the figure to the right and dimensions
as detailed in Figure 16.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, use dry nitrogen to blow clean the pipe.
Figure 16: Dimensions of the Flare
90°
2
A
R=0.4~0.8
20
Table 4: Flared Connection Dimensions
Pipe
Vapor (in. O.D.) Liquid (in. O.D.)
1/2 1/4
5/8 3/8
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.
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.
Figure 17: Creating a Flare Fitting
Copper
1.
tube
90°
Pipe
2A.
Reamer
Point
down
3.
Bar "A"
Copper pipe
Clamp handle
Inside is shiny with no scratches
Smooth
4.
Slanted
Even length
"A" in Figure 17
Vapor (in.) Liquid (in.)
1/8 1/16
1/8 1/16
Slanted Uneven Rough
2B. Flare nut
Copper
tube
Handle
Bar
Yoke
Cone
Red arrow
Incorrect Flares
Damanged Cracked Uneven
surface thickness
Thickness
Vapor (in.) Liquid (in.)
1/8 1/8
1/16 1/8