Refrigerant Piping - Toshiba MML-UP0071H-E Installation Manual

 Piping method
The drain pipe and the refrigerant pipe can be connected to left, right, rear or bottom side arbitrarily according to
the installation location.
Select a set knockout hole referring to the following figure.
For left side
Hole for wire
Hole for drain pipe and
refrigerant pipe
 Connecting drain pipe
Insert the drain hose into the connector until the hose can go no farther.
REQUIREMENT
• Connect the hard vinyl chloride pipes certainly so that water does not leak by using adhesive agent for vinyl chloride.
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply any
extra force on the connecting section until the adhesive agent dried.
 Check the draining
• In the test run, check that water drain is properly performed and water does not leak from the connecting part of
the pipes. Check draining also when installed in heating period.
• Remove the cover from the bottom side of the heat exchanger. Pour water to the drain pan. Confirm that water
drains well and does not leak from the drain hose connecting part.
• Once the drain is confirmed, attach back the cover in the way it was.
CAUTION CAUTION
Water must be poured slowly.
If water is swiftly poured, water may spatter across the inside of the indoor unit. It may cause malfunction of the unit.
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Drain pan Drain pan
Hole for refrigerant Hole for wire
pipe and drain pipe
Hole for drain pipe Hole for drain pipe
For bottom
and refrigerant pipe and refrigerant pipe
side
6

Refrigerant piping

CAUTION CAUTION
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 deoxidized
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.
CAUTION CAUTION
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 refabricated.
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
Outside diameter size (mm)
Model MML-
Gas side
UP007-UP012 9.5
UP015, UP018 12.7
UP024 15.9
– 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
1. Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
2. 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)
Outside diameter R410A tool
size (mm) used
6.4, 9.5
0 - 0.5
12.7, 15.9
▼Flaring dia. meter size: A (Unit: mm)
Outside diameter
A +0
size (mm)
–0.4
6.4 9.1
9.5 13.2
12.7 16.6
15.9 19.7
CAUTION CAUTION
Liquid side
• Do not scratch the inner surface of the flared part
6.4
when removing burrs.
6.4 • Flare processing under the condition of scratches on
the inner surface of flare processing part will cause
9.5
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.
B
Conventional
tool used
1.0 - 1.5
A
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