38
Multi V W
all-Mounted Indoor Unit
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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. Remove the flare nuts attached to the indoor and outdoor units.
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.
•
Firmly hold copper tube in a bar with a dimension as indicated in
the table below.
4. Carefully inspect the flared pipe end.
•
Compare the geometry with the figures and dimensions as detailed.
•
If the flare is defective, cut it off and re-do procedure.
•
If flare looks good, blow the pipe clean with dry nitrogen.
Flaring Procedure
Flaring and Brazing Procedures
One of the main causes of refrigerant leaks is a defective connection. For VRF systems, the installer needs to know how to perform both
flared and brazed connections successfully.
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.
•
During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.
•
Do not use kinked pipe.
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
Piping Preparation
Figure 31:
Flaring procedure.
