Samsung SINGLE AC MNMSEH/EU Series Technical Data Book page 66

14. Installation
Outdoor Unit
Step 6 Optional: Cutting and flaring the pipes
1 Make sure that you have the required tools available. (pipe
cutter, reamer, flaring tool, and pipe holder)
2 If you wish to shorten the pipes, cut it with a pipe cutter,
taking care to ensure that the cut edge remains at a 90°
angle with the side of the pipe. Refer to the illustrations
below for examples of edges cut correctly and incorrectly.
90°
3 To prevent any gas from leaking out, remove all burrs at
the cut edge of the pipe, using a reamer.
4 Slide a flare nut on to the pipe and modify the flare.
D
Pipe Flare
Outer diameter (D)
ø6.35 mm
ø9.52 mm
ø12.70 mm
ø15.88 mm
ø19.05 mm
• 1 N·m = 10 kgf·cm
66
Oblique Rough
A
R 0.4 to 0.8 mm
L
Flare
Depth (A) Flare dimension (L)
14 to 18 8.7 to 9.1 mm
34 to 42 12.8 to 13.2 mm
49 to 61 16.2 to 16.6 mm
68 to 82 19.3 to 19.7 mm
100 to 120 23.6 to 24.0 mm
5 Check that the flaring is correct, referring to the
illustrations below for examples of incorrect flaring.
Burr
Correct
CAUTION
• If the pipes require brazing ensure that OFN(Oxygen Free
Nitrogen) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 to 0.05 MPa.
Step 7 Connecting up and removing air in the
circuit
D
CAUTION
• When installing, make sure there is no leakage. When
recovering the refrigerant, ground the compressor first
before removing the connection pipe. If the refrigerant
pipe is not properly connected and the compressor works
with the service valve open, the pipe inhales the air and
it makes the pressure inside of the refrigerant cycle
abnormally high. It may cause explosion and injury.
The air in the indoor unit and in the pipe must be evacuated.
If air remains in the refrigerant pipes, it will affect the
compressor either reduce cooling/heating capacity or lead
to a malfunction. Refrigerant for air purging is not charged
in the outdoor unit. Use Vacuum Pump as shown at the right
figure.
1 Connect each assembly pipe to the appropriate valve on
the outdoor unit and tighten the flare nut.
1
2
Inclined Damaged Cracked
Surface
3
Uneven
Thickness