Draining The Water; Refrigerant Piping Connection; Evacuating - Toshiba RAS-25U2FVG-ND Installation Manual

CAUTION
1. Install the outdoor unit in a location where there are no obstructions
near its air intake or air outlet.
2. When the outdoor unit is installed in a place that is always exposed
to strong winds like on the coast or on a high story of a building,
secure the normal fan operation using a duct or a wind shield.
3. Especially in windy areas, install the unit to prevent the admission of
wind.
4. Installation in the following places may result in trouble.
Do not install the unit in such places.
• A place full of machine oil
• A saline-place such as the coast
• A place full of sulfi de gas
• A place where high-frequency
waves are likely to be generated,
such as from audio equipment,
welders, and medical equipment.

Draining the Water

• Holes are provided on the base plate of the outdoor unit to ensure that the
defrost water produced during heating operations is drained off effi ciently.
If a centralized drain is required when installing the unit on a balcony or
wall, follow the steps below to drain off the water.
1. Proceed with water-proofi ng by installing the water-proof rubber caps
in the 2 elongated holes on the base plate of the outdoor unit. [How to
install the water-proof rubber caps]
1) Place four fi ngers into each cap, and insert the caps into the water
drain holes by pushing them into place from the underside of the base
plate.
2) Press down on the outer circumferences of the caps to ensure that
they have been inserted tightly.
(Water leaks may result if the caps have not been inserted properly,
if their outer circumferences lift up or the caps catch on or wedge
against something.)
2. Install the drain nipple and a commercially available drain hose (with
16 mm inside diameter), and drain off the water.
(For the position where the drain nipple is installed, refer to the
installation diagram of the indoor and outdoor units.)
• Check that the outdoor unit is horizontal, and route the drain hose at a
downward sloped angle while ensuring that it is connected tautly.
Base plate
Drain nipple
Do not use ordinary garden hose, but one can fl atten and prevent water
from draining.
Strong
wind
Water-proof rubber caps
(supplied with the outdoor unit)
Base plate
Drain nipple
Commercially available
drain hose

Refrigerant Piping Connection

Flaring
1. Cut the pipe with a pipe cutter.
2. Deburr the inside of the pipe at its end.
Take steps to ensure that the removed burrs will not enter the pipe.
3. Remove the fl are nuts provided with the indoor and outdoor units, and
insert them into the pipe.
4. Flare the pipe.
The projection margin of the pipe must be checked.
5. Check that the fl are has the appropriate shape.
90
A
Die
Pipe
Pipe
RIDGID
Outside
Thickness (clutch type)
diameter
R32 tool
mm mm mm
6.35 0.8 0 to 0.5
9.52 0.8 0 to 0.5
12.7 0.8 0 to 0.5
CAUTION
• Do not scratch the inner surface of the fl ared part when removing
burrs.
• Flare processing under the condition of scratches on the inner surface
of fl are processing part will cause refrigerant gas leak.
• Tightening torque for connection of fl are pipe
The pressure of R32 is higher than
R22 (Approx. 1.6 times). Therefore
securely tighten the fl are pipes
which connect the outdoor unit and
the indoor unit with the specifi ed
tightening torque using a torque
wrench. If any fl are pipe is incorrectly
connected, it may cause not only a
gas leakage but also trouble in the
refrigeration cycle.

Evacuating

After the piping has been connected to the indoor unit, you can perform
vacuuming together at once.
VACUUMING
Evacuate the air in the connecting pipes and in the indoor unit using a
vacuum pump. Do not use the refrigerant in the outdoor unit. For details,
see the manual of the vacuum pump.
11
Obliquity Roughness Warp
B C
A B Flare Nut
IMPERIAL
(wing nut
C Tighten torque
type)
R32 tool
mm mm mm N·m
1.5 to 2.0 9.1 17 14 to 18 1.4 to 1.8
1.5 to 2.0 13.2 22 33 to 42 3.3 to 4.2
2.0 to 2.5 16.6 26 50 to 62 5.0 to 6.2
Flare at
indoor unit side
Flare at
outdoor unit side
EN
ES
FR
IT
DE
PT
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CZ
kgf·m
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TR
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FI
NO
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EE
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