Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual page 12

- 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.
Dise
Pipe Dia. (mm) R410A Flare Tool When using conventional flare tool (R407C)
Rigid (clutch type)
0~0.5
ø6.35 (1/4")
ø9.52 (3/8") 0~0.5
ø12.7 (1/2") 0~0.5
0~0.5
ø15.88 (5/8")
* When applying the flare processing for the refrigerant R410A using conven-
tional 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.
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
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