Refrigerant Piping - Toshiba MMK-UP0051DHPL-E Installation Manual

9

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
Liquid side
25-EN
CAUTION
CAUTION
(dia.: mm)
UP0051 to UP0151 to
UP0121 type UP0181 type
9.5 12.7
6.4 6.4
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.
• Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R32 or R410A differ from
those of refrigerant R22, the flare tools 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
▼ Flaring dia. meter size: A (Unit: mm)
Outer dia. of copper pipe
6.4
9.5
12.7
• Do not scratch the inner surface of the flared
part when removing burrs.
• Flare processing under the condition of
scratches on the inner surface of flare
processing part will cause refrigerant gas
leak.
• Check that the flared part is not scratched,
deformed, stepped, or flattened, and that
there are no chips adhered or other problems,
after flare processing.
• Do not apply refrigerating machine oil to the
flare surface.
‒ 25 ‒
Installation Manual
Conventional
Tool used
tool used
0 to 0.5 1.0 to 1.5
+0
A
-0.4
9.1
13.2
16.6
CAUTION
B