Toshiba RAS-18YKH-E Service Manual page 19

8-4. Outdoor Unit
8-4-1. Installation Place
• A place which provides the spaces around the outdoor
unit as required above in the diagram.
• A dry sunny place. If the place is exposed to direct
sunlight use an awning for protection.
• 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 your 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.
• A place where the drain water does not raise any problem.
• An allowable length of the refrigerant piping is up to 15 m.
• An allowable heat level is up to 6 m.
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 a 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 area, install the unit to
prevent the admission of wind.
4. Installation in the following places may result
trouble. Do not install the unit such places.
• A place full of machine oil.
• A saline-place such as coast.
• A place full of sulfide gas.
• A place where high-frequency
waves are likely to be
generated as from
audio equipment,
Strong
wind
welders, and
medical
Fig. 8-4-1
equipment.
8-4-2. Refrigerant Piping Connection
Flaring
1. Cut the pipe with a pipe cutter.
90˚ Obliquity Roughness Warp
Fig. 8-4-2
2. Insert a flare nut into the pipe, and flare the pipe.
A (mm)
Outer dia. Thickness
(mm) (mm)
Imperial Rigid
6,35 1,3 0,7 0,8
Die
12,7 1,8 1,0 to 1,1 1,0
Fig. 8-4-3
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.
CAUTION
• Do not apply excess torque.
Otherwise, the nut may crack depending on the conditions.
Outer dia. Tightening Additional
(mm) torque tightening torque
6,35 16 (1,6 kgf•m) 18 (1,8 kgf•m)
12,7 49 (5,0 kgf•m) 54 (5,5 kgf•m)
Half union Flare nut
Externally
threaded side
Use a wrench to secure. Use a torque wrench to tighten.
Fig. 8-4-4
8-4-3. Evacuating
AIR PURGE
Evacuate the air in the connecting pipes and in the
indoor unit using vacuum pump. Do not use the
refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.
Use of vacuum pump
1. Connect the charge hose (A) from the manifold valve
to the charge inlet of the gas side packed valve.
2. Connect the charge hose (B) to the port of vacuum
pump.
3. Open fully the low pressure side handle of the
manifold valve.
4. Operate the vacuum pump.
5. Close the low pressure side handle of manifold valve
after evacuating and stop the vacuum pump.
Continue evacuating more than 15 minutes and check
the pressure gage indicates –0,1 MPa (–76 cm Hg).
6. Open the stems of packed
Pressure
valves A and B1 all the way.
gage
7. Securely tighten the stem Low pressure
side handle
cap to each of the packed
valve stems.
Outdoor unit
Indoor unit
C
A
Service port
Gas
(Ø12,7)
D Packed
B
1
valve
Liquid
(Ø6,35)
Fig. 8-4-5
CAUTION
• KEEP IMPORTANT 4 POINTS FOR PIPING WORK
(1)Take away dust and moisture
(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 gas leak (connected points)
A
Packed Valve Handling Precautions
• Open the valve stem all the way out; so not try to
Pipe
open it beyond the stopper.
• Securely tighten the valve stem cap torque is as follows;
Gas pipes side (ø12,7 mm) : 49 N•m (5,0 kgf•m)
Liquid pipe side (ø6,35 mm) : 16 N•m (1,6 kgf•m)
Hexagon wrench is required.
Flare nut
Stopper
Valve body
Valve stem
Valve stem cap
(Unit : N•m) 8-4-4. Electrical Work
How to connect the power cord
For the air conditioner that has no power cord,
connect a power cord to it as mentioned below.
• Remove the electric parts cover from the outdoor
unit. (4 screws)
Internally
threaded side
• After removing the electric parts cover, remove
the cord clamp.
• Connect and secure the power supply cord.
Terminal block
Screw
Earth line
Cord
clamp
Power
supply
cord
Fig. 8-4-7
Stripping length of power cord
90mm
10mm Earth line
N
L
NOTE
10mm
80mm
• Use standard wire only.
• Wire type : 3,5 mm² or
Manifold valve
Fig. 8-4-8 more AWG-12.
High
pressure
side
handle
Lo Hi
WARNING
To plug the cable in the plug receptacle, take
Charge
the following precaution.
hose (B)
THIS APPLIANCE MUST BE EARTHED.
Charge
IMPORTANT
hose (A) VP
THE WIRES IN THIS MAINS LEAD ARE
COLORED IN ACCORDANCE WITH THE
FOLLOWING CODE :
L : Brown
-LIVE
N : Blue -NEUTRAL
: Green and Yellow -EARTH
Fig. 8-4-9
As the colors of the flexible cord of this
appliance may not correspond with the colored
markings, to identify terminals in your plug, as
follows :
Connect BROWN colored core to plug terminal
marked letter "L".
Connect BLUE colored core to plug terminal
marked letter "N".
Connect GREEN and YELLOW colored core to
plug terminal marked Earth symbol "
The installation of the cables has to be done in
such a way that the basic insulated wires for the
infrared sensor can not be touched.
Use the power supply cord/cables with
thickness, type, and protective devices
specified in the installation manual.
Prepare the interior power supply cord and
cables wiring with current capacity sufficient for
starting and usage of air conditioner.
Fig. 8-4-6
Model RAS-18YAH-E
(RAS-18YKH-E)
Power source 50 Hz ~, 220 – 240V
Maximum running current
Plug socket & fuse rating
Wiring 3,5 mm² (AWG-12) or more
CAUTION
If incorrect/incomplete wiring is carried out, it
will cause an electrical fire or smoke.
Terminal block
Prepare the power source for exclusive use with
the air conditioner.
This product can be connected to the mains.
Earth line
Connection to fixed wiring :
A switch or circuit breaker which disconnects all
poles and has a contect separation of at least 3
Screw
mm must be incorporated in the fixed wiring.
An approved short circuit breaker or switches
Cord
clamp must be used.
Connecting
cable
8-4-5. Wiring Connection
1. Remove the electric parts cover from the
outdoor unit. (4 screws)
2. Connect the connecting cable to the terminal as
identified with their respective matched numbers
on the terminal block of indoor and outdoor unit.
(1,3 mm² AWG-16 or more)
3. When connecting the connecting cable to the
outdoor unit terminal, make a loop as shown
installation diagram, to prevent water coming in
the outdoor unit.
4. Insulate the unused cords (conductors) with
strip the sheath of connecting cable to prevent
the shortage or electric leakage.
Process them so that they do not touch any
electrical or metal parts.
Stripping length of connecting cable
60mm
10mm Earth line
3
2
1
10mm
L
Connecting
cable
50mm
N
Fig. 8-4-10
CAUTION
1. Wrong wiring connection may cause some
electrical parts burn out.
2. Be sure to use the cord clamps and the
electric parts cover to the specified positions
with attached to the product.
Mount the electrical parts cover for cables of
connecting section firmly with the screws.
3. Do not damage or scratch the conductive
core and inner insulator of power supply and
".
inter connecting cables when peeling them.
4. Be sure to comply with local cords on running
the wire from indoor unit to outdoor unit (size
of wire and wiring method etc.) Wire type :
More than H05 RN-F
5. Use the power supply cord and inter-connecting
cable with specified thickness, specified type,
and protective devices specified.
6. No wire should touch refrigerant piping,
compressor of any moving parts.
RAS-18YAH-A
(RAS-18YKH-A)
50 Hz ~, 240V
16,8 A
20 A
Terminal
block
1 2 3
Terminal
screw
Screws
Cord clamp