Outdoor Unit - Toshiba RAS-10NKV-E Service Manual

9.3 OUTDOOR UNIT

9-3-1. Installation Place
• A place which provides the spaces around the outdoor unit as shown
in the left diagram.
• A place which can bear the weight of the outdoor unit and does not
allow an increase in noise level and vibration.
• A place where the operation noise and discharged air do not disturb
users neighbors.
• A place which is not exposed to a strong wind.
• A place free of a leakage of combustible gases.
• A place which does not block a passage.
• When the outdoor unit is to be installed in an elevated position, be
sure to secure its feet.
• An allowable length of the connecting pipe is up 10m for
10UKV-E.
• An allowable height level is up to 8m for 10UKV-E.
• A place where the drain water does not raise any problem.
CAUTION
1. Install the outdoor unit without anything blocking the air
discharging.
2. When the outdoor unit is installed in a place exposed always
to strong wind like a coast or on a high story of a building, secure
the normal fan operation using a duct or a wind shield.
3. Specially in windy areas, install the unit to prevent the
admission of wind.
4. Installation in the following places may result 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 sulfide gas.
• A place where high-frequency
waves are likely to be
generated as from audio
equipment, welders, and
medical equipment.
9-3-2 Refrigerant Piping Connection
Flaring
1. Cut the pipe with a pipe cutter.
°
90
Fig. 9-3-2
2. Insert a flare nut into the pipe, and flare the pipe.
• Projection margin in flaring : A (Unit : mm)
Rigid (Clutch type)
Outer dia. of copper pipe R-410A tool used
6.35
9.52
Imperial (Wing nut type)
A
Outer dia. of copper pipe
Die
Pipe
Fig. 9-3-3
Tightening Connection
Align the centers of the connecting pipes and tighten the flare nut as far
as possible with your fingers. Then tighten the nut with a spanner and
torque wrench as shown in the figure.
Half union
Externally
threaded side
Use a wrench to secure.
Fig. 9-3-4
Strong
wind
Fig. 9-3-1
Obliquity Roughness Warp
Conventional tool used
0 to 0.5 1.0 to 1.5
0 to 0.5 1.0 to 1.5
R-410A
6.35 1.5 to 2.0
9.52 1.5 to 2.0
Flare nut
Internally
threaded side
Use a torque wrench to tighten.
• Do not apply an excess force.
CAUTION
Otherwise, the nut may crack depending on
the conditions.
Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
• Tightening torque for connection of flare pipe
The pressure of R-410A is higher than
R-22. (Approx. 1.6 times)
Therefore securely tighten the flare
pipes which connect the outdoor unit
and the indoor unit with the specified
tightening torque using a torque
wrench. If each flare pipe connects
incoorectly, it may cause not only a
gas leakage but also a trouble or
the refrigeration cycle.
Shaping pipes
1. How to shape the pipes
Shape the pipes along the incused line on the outdoor unit.
2. How to fit position of the pipes
Put the edges of the pipes to the
place with a distance of 85mm
from the incused line.
9-3-3. Evacuating
After the piping has been connected to the indoor unit, you can perform
the air purge together at once.
AIR PURGE
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.
Use a vacuum pump
Be sure to use a vacuum pump with counter-flow prevention function so
that inside oil of the pump does not flow backward into pipes of the air
conditioner when the pump stops. (If inside oil of the vacuum pump
enters into the air conditioner which adopts R-410A, a trouble of the
refrigeration cycle may be caused.)
1. Connect the charge hose from the manifold valve to the service port
of the gas side packed valve.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold valve.
4. Operate the vacuum pump to start for evacuating. Perform evacuating
for about 15 minutes if the piping length is 20 meters. (15 minutes for
20 meters) (assuming a pump
capacity of 27 liters per minute.)
Then confirm that the
compound pressure
gauge reading is –101 kPa
(–76 cmHg).
5. Close the low pressure
side valve handle of
gauge manifold.
6. Open fully the valve
stem of the packed
valves (both side of
Gas and Liquid).
7. Remove the charging
hose from the service
port.
8. Securely tighten the
caps on the packed valves.
– 42 –
FILE NO. SVM-05026
(Unit : N·m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf·m)
33 to 42 (3.3 to 4.2 kgf·m)
Flare at indoor
unit side
Flare at outdoor
unit side
Fig. 9-3-5
Incused line
Fig. 9-3-6
Compound pressure
Pressure gauge
gauge
-101kPa
(-76cmHg) Manifold valve
Handle Hi
Handle Lo
(Keep full closed)
Charge hose
Charge hose
(For R-410A only)
(For R-410A only)
Vacuum pump
Connecting
adapter for
pipe
counter-flow
prevention
(For R-410A only)
Vacuum
pump
Packed valve at liquid side
Packed valve at gas side
Service port
(Valve core (Setting pin))
Fig. 9-3-7