Refrigerant Piping - Toshiba MMK-AP0057HP-E Service Manual

9

REFRIGERANT PIPING

Refrigerant Piping
1. Use copper pipe with 0.8mm or more
thickness. (In case pipe size is dia. 15.9,
with 1.0mm or more.)
2. Flare nut and flare works are also different
from those of the conventional refrigerant.
Take out the flare nut attached to the main
unit of the air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide
support brackets at intervals of 2.5 to 3m to
clamp the refrigerant pipe. Otherwise, abnormal
sound may be generated.
IMPORTANT 4 POINTS FOR PIPING WORK
1. Remove dust and moisture from the inside
of the connecting pipes.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes
using VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
MMK-
Gas side
Liquid side
1111058602_EN.indd 19
CAUTION
(dia.: mm)
AP005 to AP012 type
9.5
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 R410A differ from those of
refrigerant R22, the flare tools newly
manufactured for 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)
Rigid (Clutch type)
R410A tool used
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 .
1 2 7 .
1 5 9 .
* In case of flaring for R410A with the
conventional flare tool, pull it out
approx. 0.5 mm more than that for
R22 to adjust to the specified flare
size. The copper pipe gauge is
useful for adjusting projection margin
size.
- 86 -
FILE NO. SVM-17045
Installation Manual
Conventional
tool used
R410A R410A
0 to 0.5 1.0 to 1.5
A + 0
-0.4
R410A
9 1 .
1 3 2 .
1 6 6 .
1 9 7 .
A
B
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