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8
REFRIGERANT PIPING
Use flare nuts that are included with the unit.
Using different flare nuts may cause refrigerant
gas leakage.
Refrigerant piping
Use the following item for the refrigerant
piping.
Material: Seamless phosphorous de-oxidized
copper pipe.
6.35, 9.52 and 12.7 wall thickness 0.8 mm or
more.
15.88 wall thickness 1.0 mm or more.
REQUIREMENT
When the refrigerant pipe is long, provide
support brackets at intervals of 2.5 - 3 m to
clamp the refrigerant pipe. Otherwise, abnormal
sound may be generated.
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and
flared joints are not allowed indoors. When
mechanical connectors are reused indoors,
sealing parts shall be renewed. When flared
joints are reused indoors, the flare part shall
be re-fabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by
using VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
MMK-
Gas side
UP027 to
UP036
type
13-EN
CAUTION
CAUTION
(dia. : mm)
PIPE SIZE (mm)
Liquid side
15.9
9.5
Permissible Piping Length and
Height Difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual
attached to the outdoor unit.
Flaring
Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
pipe.
newly manufactured for R32 or R410A are
recommended.
However, the
conventional tools can
be used by adjusting
projection margin of the
copper pipe.
Projection margin in flaring: B (Unit: mm)
RIDGID (Clutch type)
Outer dia. of
copper pipe
6.4 , 9.5
12.7 , 15.9
Flaring dia. meter size: A (Unit: mm)
Outer dia. of copper pipe
6.4
9.5
12.7
15.9
– 13 –
Installation Manual
Conventional
Tool used
tool used
0.5 to 1.0
1.0 to 1.5
0.5 to 1.1
1.5 to 2.0
+0
A
-0.4
9.1
13.2
16.6
19.7
B
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