Refrigerant Piping And Evacuating - Toshiba MMU-AP0092H Installation Manual

SMMS 4-way Air Discharge Cassette Type
6

REFRIGERANT PIPING AND EVACUATING

Refrigerant Piping
1. Use copper pipe with 0.8 mm or more thickness.
(In case pipe size is Ø15.9, 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
Model MMU-
Pipe size
(Dia. : mm)
15-EN
CAUTION
AP0092H AP0152H
to to
AP0122H AP0182H
Gas
9.5 12.7
side
Liquid
6.4 6.4
side
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)
Outer dia. of
copper pipe
6.4, 9.5
12.7, 15.9
AP0242H
to
▼ Flaring dia. meter size : A (Unit : mm)
AP0562H
15.9
Outer dia. of copper
pipe
9.5
12.7
15.9
* 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.
– 15 –
Installation Manual
R410A tool Conventional
used
R410A
0 to 0.5
A
R410A
6.4
9.5 13.2
16.6
19.7
B
tool used
R410A
1.0 to 1.5
+ 0
-0.4
9.1
A