Refrigerant Piping - LG MULTI V ARNU073BGA4 Installation Manual

REFRIGERANT PIPING

Piping Preparation
WARNING
Do not braze in an enclosed location. Do not allow the refrigerant to
leak during brazing. Always test for gas leaks before and after brazing.
• If refrigerant combusts, it generates a toxic gas.
Note:
• Do not use kinked pipe.
Braze the pipe to the service valve pipe stub of the outdoor unit. After brazing,
check for refrigerant gas leaks. When selecting flare fittings, always use a 45°
fitting rated for high-pressure refrigerant R410A. Fittings must also comply with
local, state, and federal standards.
Creating a Flare Fitting
One of the main causes of refrigerant leaks is defective flared connections. Use
the following procedure to create flared connections.
1. Determine the installation location. Ensure the location has enough space to
allow necessary duct connections and maintenance access.
• 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 into the pipe.
2B. Slide the flare nut onto the copper tube.
3. Flare 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.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow the pipe clean with dry nitrogen.
Dimensions of the Flare.
90°
"A"
40
R=0.4 – 0.8
Due to our policy of continuous product innovation, some specifications may change without notification.
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Copper
1.
tube
2A.
Point
down
3.
Bar
4.
Smooth
Even Length
Pipe Size (in. O.D.) Outside Diameter (mm)
1/4
3/8
1/2
5/8
3/4
Slanted Uneven Rough
90°
Pipe
2B. Flare nut
Copper
Reamer
tube
Bar
Copper pipe
Red arrow
Clamp handle
Inside is shiny with no scratches
Incorrect Flare
Slanted Surface
Damaged
"A" Dimension (mm [in.])
6.35 ~ 9.1 (11/32 - 23/64)
9.52 ~ 13.2 (1/2 - 33/64)
12.7 ~ 16.6 (41/64 - 21/32)
15.88 ~ 19.7 (49/64 - 25/32)
19.05
Handle
Yoke
Cone
Cracked Uneven
Thickness
─