Refrigerant Piping And Evacuation - Toshiba MMD-UP0071SPH-UL Installation Manual

 Connecting method of the duct
Duct: Insulation material
(Locally procured)
Flange
Air discharge side
CAUTION CAUTION
If sealing process with a heat insulation material or an aluminum tape is incomplete, it may cause dewing resulted in
falling of water drop.
23-EN
Connect a duct to the
outside of the flange.
In addition, the duct must be
covered with insulation
Flange (Locally procured)
material so that the flange
will not be exposed.
Aluminum tape (Locally procured)
Indoor unit
Air intake side
Aluminum tape (Locally procured)
Under surface
7

Refrigerant piping and evacuation

 Refrigerant piping
1. Use copper pipe with 0.03" (0.8 mm) or more
thickness.
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 8.2' - 9.8' (2.5 - 3 m) to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated.
CAUTION CAUTION
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 by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
 Pipe size
Model UP007, UP009,
MMU-
name UP012 type
3/8"
Gas side
(9.5 mm)
Pipe size
1/4"
Liquid side
(6.4 mm)
– 12 –
 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: in (mm))
Rigid (Clutch type)
R410A tool
used
Outer dia. of copper pipe
R410A
1/4" (6.4), 3/8" (9.5)
0 - 0.02"
(0 - 0.5)
1/2" (12.7)
UP015, UP018
type
▼Flaring dia. meter size: A (Unit: in (mm))
1/2"
(12.7 mm)
Outer dia. of copper pipe
1/4"
(6.4 mm)
1/4" (6.4)
3/8" (9.5)
1/2" (12.7)
* 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.
B
Conventional
tool used
R410A
0.04" - 0.06"
(1.0 - 1.5)
A +0
–0.02 (0.4)
R410A
0.36" (9.1)
0.52" (13.2)
0.65" (16.6)
A
EN
24-EN