Toshiba MMK-AP0157HPUL, Service Manual

Page: 87 / 120

9
REFRIGERANT PIPING
Refrigerant Piping
1. Use copper pipe with 0.03" (0.8 mm) or
more thickness. (In case pipe size is dia.
5/8" (15.9 mm),with 0.04" (1.0 mm) 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.
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)
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 8'2" - 9'9" (2.5 - 3 m) to
clamp the refrigerant pipe. Otherwise, abnormal
sound may be generated
They vary according to the outdoor unit.
For details, refer to the Installation Manual attached
to the outdoor unit.
CAUTION
Pipe size
Model
AP015 to
AP018 type
AP024 type
Gas side 1/2” (12.7) 5/8” (15.9)
Liquid side 1/4” (6.4) 3/8” (9.5)
(dia.: in (mm))
Permissible Piping Length and
Height Difference
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.
B
Projection margin in flaring: B (Unit: in (mm))
RIDGID (Clutch type)
Flaring dia. meter size: A (Unit: in (mm))
Outer dia. of
copper pipe
R410A tool used
Conventional
tool used
R410A R410A
1/4” (6.4) , 3/8” (9.5)
0 - 0.02” (0 - 0.5)
0.04” - 0.06”
(1.0 - 1.5)
1/2” (12.7) , 5/8” (15.9)
Outer dia. of copper pipe
R410A
1/4” (6.4) 0.36” (9.1)
3/8” (9.5) 0.52” (13.2)
1/2” (12.7) 0.66” (16.6)
5/8” (15.9) 0.78” (19.7)
* In case of flaring for R410A with the
conventional flare tool, pull it out
approx. 0.02” (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.
A
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