Piping Preparation - LG LS091HSV3 Installation Manual

Piping Preparation

• Do not allow the refrigerant to leak during brazing; if the 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.
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 ared
connections. Create ared connections using the procedure at right (Fig-
ure 31).
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 Warn-
ing 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 30.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow clean the pipe with dry nitrogen.
Figure 30: Dimensions of the Flare
90°
2
A
R=0.4~0.8
GENERAL INSTALLATION GUIDELINES
Table 14: 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 are ttings, always use a 45 tting rated for use with
high pressure refrigerant R410A. Failure to do so may result in refrig-
erant leaks which in turn could result in personal injuries or death from
oxygen depletion. Selected ttings must also comply with local, state, or
federal standards.
Figure 31: 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
4. Smooth
Even length
"A"
Vapor (in.) Liquid (in.)
1/8 1/16
1/8 1/16
Piping Preparation
Slanted Uneven Rough
2B. Flare nut
Copper
tube
Handle
Bar
Yoke
Cone
Red arrow
Incorrect Flares
Slanted Damanged Cracked Uneven
surface thickness
Thickness
Vapor (in.) Liquid (in.)
1/8 1/8
1/16 1/8
27