Mitsubishi Electric Fresh Master GUF-50RD3 Installation Instructions Manual page 10

• Make sure to use new refrigerant piping.
- When using the existing piping which used R22, take care of the
following points.
• Replace the flare nut with that is attached to the product. Flare
section must be finished with the flare processing.
• Use of piping with thin wall should be avoided.
Dice
Pipe Dia. (mm) R410A Flare Tool When using conventional flare tool (R22/R407C)
Rigid (clutch type)
ø6.35 (1/4") 0~0.5
ø9.52 (3/8") 0~0.5
ø12.7 (1/2") 0~0.5
ø15.88 (5/8") 0~0.5
* When applying the flare processing for the refrigerant R410A using conventional
tools, conduct the work referring to the above. If you use the copper pipe gauge
for the adjustment of protrusion margin, you can secure the dimension A.
10
A
Copper pipe
Dimension A (mm)
Imperial (wing nut) type
1.0~1.5 1.5~2.0
1.0~1.5 1.5~2.0
1.0~1.5 1.5~2.5
1.0~1.5 1.5~2.5
Coat small amount of ester oil, ether oil or hard alkylbenzen oil over
the entire periphery of flare seat surface.
* Do not coat at the threaded section.
(Otherwise, you cannot lock the flare nut securely.)
* Make sure to use only the flare nut attached to the main unit. (Off-the-shelf
product could be cracked.)
Flare Dimension
Copper Pipe O.D.
Dimension øB (mm)
ø6.35 8.7~9.1
ø9.52 12.8~13.2
ø12.7 16.2~16.6
ø15.88 19.3~19.7