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Step 2: Remove burrs.
Burrs can affect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
1. Hold the pipe at a downward angle to pre-
vent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Step 3: Hare pipe ends
Proper flaring is essential to achieve an airtight
seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make
sure they are facing in the right direction,
because you can’t put them on or change
their direction after flaring. See Fig. 7.6
4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
5. Clamp flare form on the end of the pipe.
The end of the pipe must extend beyond
the flare form.
Pipe
Reamer
Point down
Flare nut
Copper pipe
Flare form
Pipe
Refrigerant Piping Connection Instructions
CAUTION
• The branching pipe must be installed hor-
izontally. An angle of more than 10° may
cause malfunction.
• DO NOT install the connecting pipe until both
indoor and outdoor units have been installed.
• Insulate both the gas and liquid piping to
prevent water leakage.
CAUTION
DO NOT deform pipe while cutting. Be ex-
tra careful not to damage, dent, or deform
the pipe while cutting. This will drastically
reduce the heating efficiency of the unit.
Step 1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
1. Measure the distance between the indoor
and outdoor units.
2. Using a pipe cutter, cut the pipe a little
longer than the measured distance.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.4 for examples of
bad cuts
90º
Oblique
Rough
Warped
Fig. 7.4
Fig. 7.5
Fig. 7.6
Fig. 7.7
