129
Installation
Due to our policy of continuous product innovation, some specications may change without notication.
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Indoor unit
(Btu/h)
Pipe “A”
Vapor (in.
O.D.)
Liquid (in.
O.D.)
Vapor (in.) Liquid (in.)
≤19,100 1/2 1/4 5/8 ~ 11/16 7/16 ~ 1/2
<54,600 5/8 3/8 5/8 ~ 11/16 5/8 ~ 11/16
≤76,400 3/4 3/8 3/4 ~ 13/16 5/8 ~ 11/16
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.
Table 45: Flared Connection Dimensions.
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point
down
Flare nut
Copper
tube
Bar
Copper pipe
Clamp handle
Red arrow
Cone
Yoke
Handle
Bar
"A"
Slanted
Inside is shiny with no scratches
Smooth
Even length
Damanged
surface
Cracked Uneven
thickness
Incorrect Flares
1.
2A. 2B.
3.
4.
REFRIGERANT PIPING INSTALLATION
Refrigerant Pipe Connections
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.
90°
2
45°
2
A
R=0.4~0.8
Figure 43: Dimensions of the Flare.
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.
• 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.
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