Page 25 mrcool.com
Refrigerant Piping Connection
PIPING EXTENSION BEYOND FLARE FORM
Outer Diameter
of Pipe (in/mm)
A (in/mm)
Min. Max.
Ø 0.25” (Ø 6.35) 0.0275” (0.7) 0.05” (1.3)
Ø 0.375” (Ø 9.52) 0.04” (1.0) 0.063” (1.6)
Ø 0.5” (Ø 12.7) 0.04” (1.0) 0.07” (1.8)
Ø 0.63” (Ø 16) 0.078” (2.0) 0.086” (2.2)
Ø 0.75” (Ø 19) 0.078” (2.0) 0.094” (2.4)
Flare nut
Copper pipe
Fig. 6.3
Fig. 6.4
Flare form
Pipe
A
Fig. 6.5
DO NOT DEFORM PIPE
WHILE CUTTING
Be extra careful not to damage, dent, or
deform the pipe while cutting. This will
drastically reduce the heating efficiency of
the unit.
Pipe
Reamer
Point down
Fig. 6.2
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 prevent
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: Flare 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 cannot put them on or change
their direction after flaring. See Fig. 6.3.
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 edge
of the flare form in accordance with the
dimensions shown in the table below.
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