11. HOW TO DIAGNOSE THE TROUBLE ...................................................... 58
12. HOW TO REPLACE THE MAIN PARTS ................................................... 77
13. EXPLODED VIEWS AND PARTS LIST ................................................... 92
– 1 –
FILE NO. SVM-12053
1. SAFETY PRECAUTIONS
For general public use
Power supply cord of outdoor unit shall be more than 1.5 mm ² (H07RN-F or 60245IEC66) polychloroprene
sheathed flexible cord.
• Read this “SAFETY PRECAUTIONS” carefully before servicing.
• The precautions described below include the important items regarding safety. Observe them without fail.
• After the servicing work, perform a trial operation to check for any problem.
• Turn off the main power supply switch (or breaker) before the unit maintenance.
CAUTION
New Refrigerant Air Conditioner Installation
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT
DESTROY OZONE LAYER.
R410A refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because
the working pressure of R410A refrigerant is approx. 1.6 times of refrigerant R22. Accompanied with the
adoption of the new refrigerant, the refrigeration machine oil has also been changed. Therefore, during
installation work, be sure that water, dust, former refrigerant, or refrigeration machine oil does not enter
into the new type refrigerant R410A air conditioner circuit.
To prevent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of charging
port on main unit and installation tools are different from those used for the conventional refrigerant units.
Accordingly, special tools are required for the new refrigerant (R410A) units. For connecting pipes, use new
and clean piping materials with high pressure fittings made for R410A only, so that water and/or dust does
not enter. Moreover, do not use the existing piping because there are some problems with pressure fittings
and possible impurities in existing piping.
CAUTION
TO DISCONNECT THE APPLIANCE FROM THE MAIN POWER SUPPLY
This appliance must be connected to the main power supply by a circuit breaker or a switch with a contact
separation of at least 3 mm.
DANGER
• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO INSTALL/
MAINTAIN THE AIR CONDITIONER.
INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, ELECTRIC SHOCK OR FIRE.
• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE
ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.
DANGER: HIGH VOLTAGE
The high voltage circuit is incorporated.
Be careful to do the check service, as the electric shock may be caused in case of touching parts
on the P.C. board by hand.
• CORRECTLY CONNECT THE CONNECTING CABLE. IF THE CONNECTING CABLE IS INCORRECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.
• CHECK THAT THE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND
INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.
– 2 –
FILE NO. SVM-12053
• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE
TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.
• TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE
THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT
REGISTERS, FURNACE, STOVES, ETC.
• WHEN MOVING THE AIR CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VERY CAREFUL NOT TO ALLOW THE SPECIFIED REFRIGERANT (R410A) TO BECOME MIXED WITH ANY
OTHER GASEOUS BODY INTO THE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS
MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CIRCUIT WILL
BECOME ABNORMALLY HIGH AND IT MAY RESULT IN THE PIPE BURSTING AND POSSIBLE
PERSONNEL INJURIES.
• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE SERVICE
WORK AND THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM.
IF THE REFRIGERANT GAS IS HEATED, SUCH AS BY FIRE, GENERATION OF POISONOUS GAS
MAY RESULT.
WARNING
• Never modify this unit by removing any of the safety guards or bypass any of the safety interlock
switches.
• Do not install in a place which cannot bear the weight of the unit. Personal injury and property
damage can result if the unit falls.
• After the installation work, confirm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas
may generate.
• The electrical work must be performed by a qualified electrician in accordance with the Installation Manual. Make sure the air conditioner uses an exclusive circuit.
An insufficient circuit capacity or inappropriate installation may cause fire.
• When wiring, use the specified cables and connect the terminals securely to prevent external
forces applied to the cable from affecting the terminals.
• Be sure to provide grounding.
Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone cables.
• Conform to the regulations of the local electric company when wiring the power supply.
Inappropriate grounding may cause electric shock.
CAUTION
• Exposure of unit to water or other moisture before installation may result in an electrical short.
Do not store in a wet basement or expose to rain or water.
• Do not install in a place that can increase the vibration of the unit. Do not install in a place that can
amplify the noise level of the unit or where noise or discharged air might disturb neighbors.
• To avoid personal injury, be careful when handling parts with sharp edges.
• Perform the specified installation work to guard against an earthquake.
If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.
For Reference:
If a heating operation would be continuously performed for a long time under the condition that the outdoor
temperature is 0°C or lower, drainage of defrosted water may be difficult due to freezing of the bottom
plate, resulting in a trouble of the cabinet or fan.
It is recommended to procure an antifreeze heater locally for a safe installation of the air conditioner.
For details, contact the dealer.
ElectricIndoorOperation modeCooling
characteristic Running current (A) 0.30-0.28
COP 3.52
Operating Indoor High (dB-A) 44
noise Medium + (dB-A) 41
Indoor unit Unit model RAS-18N3KCV
Outdoor unit Unit model RAS-18N3ACV
Piping Type Flare connection
connection Indoor unit Liquid side (mm)
Refrigerant Name of refrigerant R410A
WiringPower supply3Wires:includes earth(Outdoor)
connection Interconnection 4Wires:includes earth
Usable temperature range Indoor (°C) 21~32
AccessoryIndoor unitInstallation plate1
Outdoor RAS-18N3ACV
1Ph/50hz/220-240V
1Ph/60hz/220-230V
Power consumption(W)40
OutdoorOperation modeCooling
Outdoor (dB-A) 49
Dimension Height (mm) 320
Net weight (kg) 14
Fan motor output (W) 30
Air flow rate (High) (m3/min) 14.3
Dimension Height (mm) 550
Net weight (kg) 36
Compressor Motor output (W) 1100
Fan motor output (W) 43
Air flow rate (m3/min) 34.2
Outdoor unit Liquid side (mm)
Maximum length (m) 20
Maximum chargeless length (m) 15
Maximum height difference (m) 10
Weight(kg)1.40
Power factor(%)60
Running current (A) 6.38-5.85
Power consumption (W) 1380
Power factor (%) 98
Starting current (A) 6.68-6.13
Medium (dB-A) 38
Low + (dB-A) 35
Low (dB-A) 32
Width (mm) 1050
Depth (mm) 243
Width(mm)780
Depth (mm) 290
TypeTwin rotary type with DC-inverter variable speed control
ModelDA131S1B-31FZ
Gas side (mm)
Gas side (mm)
Outdoor(°C)-10~46
Wireless remote controller 1
Batteries2
Remote controller holder 1
Toshiba New IAQ filter 2
Mounting screw
Remote controller holder
Pan head wood screw
Installation manual 1
Owner's manual 1
∅6.35
∅12.70
∅6.35
∅12.70
6(∅4x25L)
2(∅3.1Lx16L)
* The specifications may be subject to change without notice for purpose of improvement.
– 4 –
2-2. Operation Characteristic Curve
<Cooling>
(RAS-18N3KCV/RAS-18N3ACV)
12.00
11.00
10.00
9.00
8.00
7.00
6.00
Current (A)
5.00
4.00
3.00
2.00
FILE NO. SVM-12053
1.00
0.00
0 102030405060708090100110120
Compressor Speed (RPS)
2-3. Capacity Variation Ratio According to Temperature
<Cooling>
105
100
95
90
85
80
75
70
Capacity Ratio (%)
65
60
55
50
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
Condition
Indoor: DB27°C/WB19°C
Indoor Air-Flow Volume: High
Pipe Length: 7.5m
Capacity Ratio: 100% = 5.0kW
Outdoor Temperature (°C)
– 5 –
3. REFRIGERANT R410A
FILE NO. SVM-12053
This air conditioner adopts the new refrigerant HFC
(R410A) which does not damage the ozone layer.
The working pressure of the new refrigerant R410A
is 1.6 times higher than conventional refrigerant
(R22). The refrigerating oil is also changed in
accordance with change of refrigerant, so be careful
that water, dust, and existing refrigerant or
refrigerating oil are not entered in the refrigerant
cycle of the air conditioner using the new refrigerant
during installation work or servicing time.
The next section describes the precautions for air
conditioner using the new refrigerant. Conforming
to contents of the next section together with the
general cautions included in this manual, perform
the correct and safe work.
3-1. Safety During Installation/Servicing
As R410A’s pressure is about 1.6 times higher than
that of R22, improper installation/servicing may
cause a serious trouble. By using tools and
materials exclusive for R410A, it is necessary to
carry out installation/servicing safely while taking
the following precautions into consideration.
1. Never use refrigerant other than R410A in an air
conditioner which is designed to operate with
R410A.
If other refrigerant than R410A is mixed,
pressure in the refrigeration cycle becomes
abnormally high, and it may cause personal
injury, etc. by a rupture.
2. Confirm the used refrigerant name, and use
tools and materials exclusive for the refrigerant
R410A.
The refrigerant name R410A is indicated on the
visible place of the outdoor unit of the air conditioner using R410A as refrigerant. To prevent
mischarging, the diameter of the service port
differs from that of R22.
3. If a refrigeration gas leakage occurs during
installation/servicing, be sure to ventilate fully.
If the refrigerant gas comes into contact with fire,
a poisonous gas may occur.
4. When installing or removing an air conditioner,
do not allow air or moisture to remain in the
refrigeration cycle. Otherwise, pressure in the
refrigeration cycle may become abnormally high
so that a rupture or personal injury may be
caused.
5. After completion of installation work, check to
make sure that there is no refrigeration gas
leakage.
If the refrigerant gas leaks into the room, coming
into contact with fire in the fan-driven heater,
space heater, etc., a poisonous gas may occur.
6. When an air conditioning system charged with a
large volume of refrigerant is installed in a small
room, it is necessary to exercise care so that,
even when refrigerant leaks, its concentration
does not exceed the marginal level.
If the refrigerant gas leakage occurs and its
concentration exceeds the marginal level, an
oxygen starvation accident may result.
7. Be sure to carry out installation or removal
according to the installation manual.
Improper installation may cause refrigeration
trouble, water leakage, electric shock, fire, etc.
8. Unauthorized modifications to the air conditioner
may be dangerous.
If a breakdown occurs please call a qualified air
conditioner technician or electrician.
Improper repair may result in water leakage,
electric shock and fire, etc.
3-2. Refrigerant Piping Installation
3-2-1. Piping Materials and Joints Used
For the refrigerant piping installation, copper pipes
and joints are mainly used.
Copper pipes and joints suitable for the refrigerant
must be chosen and installed.
Furthermore, it is necessary to use clean copper
pipes and joints whose interior surfaces are less
affected by contaminants.
1. Copper Pipes
It is necessary to use seamless copper pipes
which are made of either copper or copper alloy
and it is desirable that the amount of residual oil
is less than 40 mg/10 m.
Do not use copper pipes having a collapsed,
deformed or discolored portion
(especially on the interior surface).
Otherwise, the expansion valve or capillary tube
may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using R22, it is necessary
to choose adequate materials.
Thicknesses of copper pipes used with R410A
are as shown in Table 3-2-1.
Never use copper pipes thinner than 0.8 mm
even when it is available on the market.
– 6 –
Table 3-2-1 Thicknesses of annealed copper pipes
Thickness (mm)
FILE NO. SVM-12053
Nominal diameter
1/4
3/8
1/2
5/8
Outer diameter (mm)
6.35
9.52
12.70
15.88
R410AR22
0.800.80
0.800.80
0.800.80
1.001.00
2. Joints
For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.
a) Flare Joints
Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds
20 mm. In such a case, socket joints can be used.
Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 3-2-3 to 3-2-6 below.
b) Socket Joints
Socket joints are such that they are brazed for connections, and used mainly for thick pipings whose
diameter is larger than 20 mm.
Thicknesses of socket joints are as shown in Table 3-2-2.
Table 3-2-2 Minimum thicknesses of socket joints
Nominal diameter
1/4
3/8
1/2
5/8
Reference outer diameter of
copper pipe jointed (mm)
6.35
9.52
12.70
15.88
Minimum joint thickness
(mm)
0.50
0.60
0.70
0.80
3-2-2. Processing of Piping Materials
When performing the refrigerant piping installation, care should be taken to ensure that water or dust does not
enter the pipe interior, that no other oil than lubricating oils used in the installed air-water heat pump is used,
and that refrigerant does not leak.
When using lubricating oils in the piping processing, use such lubricating oils whose water content has been
removed. When stored, be sure to seal the container with an airtight cap or any other cover.
1. Flare processing procedures and precautions
a) Cutting the Pipe
By means of a pipe cutter, slowly cut the pipe so that it is not deformed.
b) Removing Burrs and Chips
If the flared section has chips or burrs, refrigerant leakage may occur.
Carefully remove all burrs and clean the cut surface before installation.
c) Insertion of Flare Nut
– 7 –
A
ØD
d) Flare Processing
Make certain that a clamp bar and copper
pipe have been cleaned.
By means of the clamp bar, perform the flare
processing correctly.
Use either a flare tool for R410A or conventional flare tool.
Flare processing dimensions differ according
to the type of flare tool.
When using a conventional flare tool, be sure
to secure “dimension A” by using a gauge for
size adjustment.
Table 3-2-3 Dimensions related to flare processing for R410A
FILE NO. SVM-12053
Fig. 3-2-1 Flare processing dimensions
Nominal
diameter
1/4 6.350.8
3/8 9.520.8
1/212.700.8
5/815.881.0
Nominal
diameter
1/4 6.350.8
3/8 9.520.8
Outer
diameter
(mm)
Table 3-2-4 Dimensions related to flare processing for R22
Outer
diameter
(mm)
Thickness
(mm)
Thickness
(mm)
Flare tool for R410A
clutch type
0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5
Flare tool for R22
clutch type
0 to 0.5
0 to 0.5
A (mm)
Conventional flare tool
Clutch type Wing nut type
1.0 to 1.51.5 to 2.0
1.0 to 1.51.5 to 2.0
1.0 to 1.52.0 to 2.5
1.0 to 1.52.0 to 2.5
A (mm)
Conventional flare tool
Clutch type Wing nut type
0.5 to 1.01.0 to 1.5
0.5 to 1.01.0 to 1.5
1/212.700.8
5/815.881.0
Table 3-2-5 Flare and flare nut dimensions for R410A
NominalOuter diameterThickness
diameter(mm)(mm)
1/4 6.350.8
3/8 9.520.8
1/212.700.8
5/815.881.0
– 8 –
0 to 0.5
0 to 0.5
Dimension (mm)
ABCD
9.1 9.2 6.513
13.213.5 9.720
16.016.612.923
19.019.716.025
0.5 to 1.01.5 to 2.0
0.5 to 1.01.5 to 2.0
Flare nut width
(mm)
17
22
26
29
Table 3-2-6 Flare and flare nut dimensions for R22
FILE NO. SVM-12053
NominalOuter diameterThickness
diameter(mm)(mm)
1/4 6.350.8
3/8 9.520.8
1/212.700.8
5/815.881.0
3/419.051.0
45˚ to 46˚
BA
Dimension (mm)
ABCD
9.0 9.2 6.513
13.013.5 9.720
16.016.212.920
19.019.716.023
23.324.019.234
D
C
43˚ to 45˚
Flare nut width
(mm)
17
22
24
27
36
Fig. 3-2-2 Relations between flare nut and flare seal surface
2. Flare Connecting Procedures and Precautions
a) Make sure that the flare and union portions do not have any scar or dust, etc.
b) Correctly align the processed flare surface with the union axis.
c) Tighten the flare with designated torque by means of a torque wrench.
The tightening torque for R410A is the same as that for conventional R22.
Incidentally, when the torque is weak, the gas leakage may occur.
When it is strong, the flare nut may crack and may be made non-removable.
When choosing the tightening torque, comply with values designated by manufacturers.
Table 3-2-7 shows reference values.
NOTE :
When applying oil to the flare surface, be sure to use oil designated by the manufacturer.
If any other oil is used, the lubricating oils may deteriorate and cause the compressor to burn out.
Table 3-2-7 Tightening torque of flare for R410A [Reference values]
Nominal
diameter
Outer
diameter
(mm)
Tightening torque
N•m (kgf•cm)
1/4 6.3514 to 18 (140 to 180)
torque wrenches available on the market
Tightening torque of
N•m (kgf•cm)
16 (160), 18 (180)
3/8 9.5233 to 42 (330 to 420)
1/212.7050 to 62 (500 to 620)
5/815.8863 to 77 (630 to 770)
– 9 –
42 (420)
55 (550)
65 (650)
FILE NO. SVM-12053
3-3. Tools
3-3-1. Required Tools
The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R410A is
changed to prevent mixing of other refrigerant.
To reinforce the pressure-resisting strength, flare processing dimensions and opposite side dimension of flare
nut (For Ø12.7 copper pipe) of the refrigerant piping are lengthened.
The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge,
clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types.
1. Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22))
2. Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)
3. Tools commonly used for R410A and for conventional refrigerant (R22)
The table below shows the tools exclusive for R410A and their interchangeability.
Tools exclusive for R410A (The following tools for R410A are required.)
Tools whose specifications are changed for R410A and their interchangeability
No.
1
2
3
4
5
6
7
8
9
10
Used tool
Flare tool
Copper pipe gauge
for adjusting
projection margin
Torque wrench
(For Ø12.7)
Gauge manifold
Charge hose
Vacuum pump
adapter
Electronic balance for
refrigerant charging
Refrigerant cylinder
Leakage detector
Charging cylinder
Usage
Pipe flaring
Flaring by
conventional flare tool
Connection of flare nut
Evacuating, refrigerant
charge, run check, etc.
Vacuum evacuating
Refrigerant charge
Refrigerant charge
Gas leakage check
Refrigerant charge
air-water heat pump installation
R410A
Existence ofWhether conventional
new equipmentequipment can be
for R410Aused
Ye s∗ (Note 1)
Ye s∗ (Note 1)
Ye sN o
Ye sN o
Ye sN o
Ye sN o
Ye sN o
Ye sN o
∗ (Note 2)No
Conventional air-water
heat pump installation
Whether new equipment
can be used with
conventional refrigerant
Ye s
∗ (Note 1)
No
No
Ye s
Ye s
No
Ye s
No
(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection
margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.
(Note 2) Charging cylinder for R410A is being currently developed.
General tools (Conventional tools can be used.)
In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as the general tools.
1. Vacuum pump
Use vacuum pump by attaching
vacuum pump adapter.
2. Torque wrench (For Ø6.35, Ø12.7)
3. Pipe cutter
4. Reamer
5. Pipe bender
6. Level vial
7. Screwdriver (+, –)
8. Spanner or Monkey wrench
9. Hole core drill (Ø65)
10. Hexagon wrench
(Opposite side 4mm)
11. Tape measure
12. Metal saw
Also prepare the following equipments for other installation method and run check.
1. Clamp meter
2. Thermometer
3. Insulation resistance tester
4. Electroscope
– 10 –
FILE NO. SVM-12053
3-4. Recharging of Refrigerant
When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the
following steps.
Recover the refrigerant, and check no refrigerant
remains in the equipment.
Connect the charge hose to packed valve service
port at the outdoor unit’s gas side.
Connect the charge hose to the vacuum pump
adapter.
Open fully both packed valves at liquid and gas
sides.
When the compound gauge’s pointer has indicated
–0.1 MPa (–76 cmHg), place the handle Low in the
fully closed position, and turn off the vacuum pump’s
power switch.
Keep the status as it is for 1 to 2 minutes, and ensure
that the compound gauge’s pointer does not return.
Set the refrigerant cylinder to the electronic balance,
connect the connecting hose to the cylinder and the
connecting port of the electronic balance, and charge
liquid refrigerant.
Place the handle of the gauge manifold Low in the
fully opened position, and turn on the vacuum pump’s
power switch. Then, evacuating the refrigerant in the
cycle.
(For refrigerant charging, see the figure below.)
1. Never charge refrigerant exceeding the specified amount.
2. If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.
3. Do not carry out additional charging.
When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the
refrigeration cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the
specified amount is charged, and working pressure in the refrigeration cycle becomes abnormally high
pressure, and may cause a rupture or personal injury.
(Indoor unit)
Opened
(Outdoor unit)
Refrigerant cylinder
(with siphon)
Check valve
Opened
Open/close
valve for charging
Electronic balance for refrigerant charging
Fig. 3-4-1 Configuration of refrigerant charging
Opened
Closed
Service port
– 11 –
FILE NO. SVM-12053
1. Be sure to make setting so that liquid can be charged.
2. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.
It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant.
Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the
cylinder upside down if cylinder is not equipped with siphon.
[ Cylinder with siphon ][ Cylinder without siphon ]
Gauge manifold
OUTDOOR unit
Refrigerant
cylinder
Gauge manifold
OUTDOOR unit
cylinder
Refrigerant
Electronic
balance
R410A refrigerant is HFC mixed refrigerant.
Therefore, if it is charged with gas, the composition of the charged refrigerant changes and the
characteristics of the equipment varies.
3-5. Brazing of Pipes
3-5-1. Materials for Brazing
1. Silver brazing filler
Silver brazing filler is an alloy mainly composed
of silver and copper. It is used to join iron, copper
or copper alloy, and is relatively expensive
though it excels in solderability.
2. Phosphor bronze brazing filler
Phosphor bronze brazing filler is generally used
to join copper or copper alloy.
Electronic
balance
Siphon
Fig. 3-4-2
1. Phosphor bronze brazing filler tends to react
with sulfur and produce a fragile compound
water solution, which may cause a gas
leakage. Therefore, use any other type of
brazing filler at a hot spring resort, etc., and
coat the surface with a paint.
2. When performing brazing again at time of
servicing, use the same type of brazing filler.
3-5-2. Flux
3. Low temperature brazing filler
Low temperature brazing filler is generally called
solder, and is an alloy of tin and lead.
Since it is weak in adhesive strength, do not use
it for refrigerant pipes.
1. Reason why flux is necessary
• By removing the oxide film and any foreign
matter on the metal surface, it assists the flow
of brazing filler.
• In the brazing process, it prevents the metal
surface from being oxidized.
• By reducing the brazing filler’s surface tension,
the brazing filler adheres better to the treated
metal.
– 12 –
Nitrogen gas
cylinder
Pipe
Flow meter
M
Stop valve
From Nitrogen cylinder
Nitrogen gas
Rubber plug
FILE NO. SVM-12053
2. Characteristics required for flux
• Activated temperature of flux coincides with
the brazing temperature.
• Due to a wide effective temperature range, flux
is hard to carbonize.
• It is easy to remove slag after brazing.
• The corrosive action to the treated metal and
brazing filler is minimum.
• It excels in coating performance and is harmless to the human body.
As the flux works in a complicated manner as
described above, it is necessary to select an
adequate type of flux according to the type and
shape of treated metal, type of brazing filler and
brazing method, etc.
3. Types of flux
• Noncorrosive flux
Generally, it is a compound of borax and boric
acid.
It is effective in case where the brazing temperature is higher than 800°C.
• Activated flux
Most of fluxes generally used for silver brazing
are this type.
It features an increased oxide film removing
capability due to the addition of compounds
such as potassium fluoride, potassium chloride
and sodium fluoride to the borax-boric acid
compound.
4. Piping materials for brazing and used
brazing filler/flux
3-5-3. Brazing
As brazing work requires sophisticated techniques,
experiences based upon a theoretical knowledge, it
must be performed by a person qualified.
In order to prevent the oxide film from occurring in
the pipe interior during brazing, it is effective to
proceed with brazing while letting dry Nitrogen gas
(N2) flow.
Never use gas other than Nitrogen gas.
1. Brazing method to prevent oxidation
1) Attach a reducing valve and a flow-meter to
the Nitrogen gas cylinder.
2) Use a copper pipe to direct the piping material, and attach a flow-meter to the cylinder.
3) Apply a seal onto the clearance between the
piping material and inserted copper pipe for
Nitrogen in order to prevent backflow of the
Nitrogen gas.
4) When the Nitrogen gas is flowing, be sure to
keep the piping end open.
5) Adjust the flow rate of Nitrogen gas so that it
is lower than 0.05 m3/Hr or 0.02 MPa
(0.2kgf/cm2) by means of the reducing valve.
6) After performing the steps above, keep the
Nitrogen gas flowing until the pipe cools down
to a certain extent (temperature at which
pipes are touchable with hands).
7) Remove the flux completely after brazing.
Piping material
Copper - Copper
1. Do not enter flux into the refrigeration cycle.
2. When chlorine contained in the flux remains
3. When adding water to the flux, use water
4. Remove the flux after brazing.
Copper - Iron
Iron - Iron
Used brazing filler
Phosphor copper
Silver
Silver
Used flux
Do not use
Paste flux
Vapor flux
within the pipe, the lubricating oil deteriorates. Therefore, use a flux which does not
contain chlorine.
which does not contain chlorine
(e.g. distilled water or ion-exchange water).
Fig. 3-5-1
Prevention of oxidation during brazing
– 13 –
FILE NO. SVM-12053
4-1. Indoor Unit
Grille Inlet
Front Panel
73.5 7
50
Knock out systemKnock out system
Heat exchanger
320
4. CONSTRUCTION VIEWS
Air Inlet
1050
Air filter
Air outlet
243
50
73.5
7
Drain hose (0.5m)
Connecting pipe (0.39m)
(Flare
50
72 78
132
525
HangerHanger
Connecting pipe (0.49m)
12.70)
85
Hanger
786
235
215 215
235
78 72
150 200 222 200 278
(Flare
23
50
Wireless remote controller
Remote controller holder
6.35)
For stud bold (
For stud bold (
57
63
6)
8~
172
18
149
17.5
10)
320
40
47
65
215.5
Hanger
262.5
Center line
262.5
Installation plate outline
– 14 –
Hanger
153.5
Outline of indoor unit
65
109
40
4-2. Outdoor Unit
28
FILE NO. SVM-12053
A
108 125
600
320
50
36
306
R5.5
R
Ø
15
6 hole
A detail Drawing (Back leg)
290
86
320
Ø
FAN-GUARD
436
Ø
550
275
25 Drain outlet
2
-
Ø
11 x 14
(For 8 -
Ø
Hole
10 anchor bolt)
Ø
80
306
320
Ø
6 hole
11x14 hole
Ø
36
50
R
15
B Detail Drawing (Front leg)
COVER-PV
Z
9060090
69
320
342
100 or more
320
100 or more
Z View
600
Air intlel
Air outlel
600 or more
Installation dimension
5
92
4
Service port
137
2 - R5-5 x 17L Ushape
(For ∅ 8 - ∅10 anchor bolt)
600 or more
2 - ∅11 x 14 Long holes (For ∅8 - ∅10 anchor bolt)
• The maximum pipe length of this air conditioner is 20 m. When the pipe length exceeds 15m, the additional
charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)
– 18–
7-2. Operation Data
<Cooling>
FILE NO. SVM-12053
Tempeat
condition (°C)
Indoor Outdoor T1 (°C) (rps)
27/19 35/-
NOTES :
1. Measure surface temperature of heat exchanger pipe around center of heat exchaner path U bent.
(Thermistor themometer)
2. Connecting piping condition 7.5 m
ure
Standard
pressure
P (MPa)
0.9 to 1.1
Compressor
Heat exchanger
pipe temp.
Indoor
fan mode
Outdoor
fan mode
High
revolution
669 to 12 High
– 19 –
8-1. Indoor Unit
FILE NO. SVM-12053
8. CONTROL BLOCK DIAGRAM
Heat Exchanger Sensor (Tc)
Room Temperature Sensor (Ta)
Infrared Rays Signal Receiver
and Indication
Initializing Circuit
Clock Frequency
Oscillator Circuit
Power Supply Circuit
Converter (D.C circuit)
Noise Filter
Power Supply
(From Outdoor Unit)
MCU
Functions
• Cold draft preventing Function
• 3-minute Delay at Restart
for Compressor
• Fan Motor Starting Control
• Processing
(Temperature Processing)
• Timer
• Serial Signal Communication
• Clean Function
Serial Signal Transmitter/Receiver
Serial Signal Communication
(Operation Command and Information)
Indoor Unit Control Unit
Louver
Motor
Louver Motor
Drive Control
Indoor Fan
Motor Control
Indoor
Fan Motor
REMOTE CONTROL
Remote Control
Infrared Rays
Operation ( )
Operation Mode Selection
AUTO, COOL, DRY, FAN ONLY
Themperature Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver AUTO Swing
Louver Direction Setting
ECO
Hi Power
SLEEP (1, 3, 5, 9 OFF TIMER
– 20 –
8-2. Outdoor Unit (Inverter Assembly)
OUTDOOR UNIT
Outdoor
Fan motor
FILE NO. SVM-12053
Compressor
CONTROL BLOCK DIAGRAM
MCC5009 (PCB)
detect
Current
Gate drive
MCU
• PWM synthesis function
• Input current release control
• IGBT over-current detect control
circuit
detect
Current
• Outdoor fan control
• High power factor correction control
• Inverter output frequency control
• A/D converter function
• PMV control
• Discharge temp. control
Inverter
(DC → AC)
circuit
Gate drive
Clock
4MHz
frequency
circuit
• Signal communication to indoor unit
High Power
factor Correction
Inverter
(DC → AC)
Converter
(AC → DC)
sensor
Input current
of PMV
Driver circuit
PMV : Pulse Motor Valve
MCU : Micro Controller Unit
PMV
220–240 V ~50Hz
For INDOOR UNIT
220- 230 V ~60Hz
circuit
Indoor unit
send/receive
Discharge
temp. sensor
Outdoor air
Suction
temp. sensor
– 21 –
temp. sensor
Filter
Noise
9. OPERATION DESCRIPTION
FILE NO. SVM-12053
9-1. Outline of Air Conditioner Control
This air conditioner is a capacity-variable type air
conditioner. Its system can control the speed of
compressor motor according to load. The drive circuit
for the indoor motor is mounted in the indoor unit.
The drive circuits for outdoor motor and compressor
are mounted in the outdoor unit.
The entire air conditioner is mainly controlled by the
indoor unit controller. The indoor unit controller
drives the indoor fan motor based upon command
sent from the remote controller. Moreover, it also
determines required speed of compressor motor and
then transfers the operation command to the outdoor
unit controller.
The outdoor unit controller receives operation
command from the indoor unit and controls the outdoor
fan motor, Pulse Modulating Valve (PMV) and
revolution speed of the compressor motor.
The outdoor unit controller controls speed of
compressor motor be controlling output voltage of the
inverter and switching timing of supply power (current
transfer timing), so that compressor motor operates
according to the operation command. And then, the
outdoor unit controller transfers the operating status
back to the indoor unit controller.
As the compressor adopts four-pole brushless
DC motor, the frequency of the supply power
from inverter to compressor is two-times cycles
of the actual number of revolution.
1. Role of indoor unit controller
The indoor unit controller judges the operation
commands from the remote controller and assumes
the following functions.
• Judgment of suction air temperature of the indoor
heat exchanger by using the indoor temp. sensor.
(TA sensor)
• Judgment of the indoor heat exchanger temperature by using heat exchanger sensor (TC sensor)
(Prevent-freezing control, etc.)
• Louver motor control
• Indoor fan motor operation control
• LED (Light Emitting Diode) display control
• Transferring of operation command signal (Serial
signal) to the outdoor unit
• Reception of information of operation status
(Serial signal including outside temp. data) fromthe outdoor unit and judgment/display of error
2. Role of outdoor unit controller
Receiving the operation command signal (Serial
signal) from the indoor unit controller, the outdoor
unit performs its role.
• Compressor operation control
• Operation control of outdoor fan motor
• P.M.V. control
Operations follow ed to judgment
of serial signal from indoor side.
• Detection of inverter input current and current
release operation
• Over-current detection and prevention operation
to IGBT module (Compressor stop function)
• Compressor and outdoor fan stop function when
serial signal is off (when the serial signal does not
reach the board assembly of outdoor control by
trouble of the signal system)
• Transferring of operation information (Serial
signal) from outdoor unit controller to indoor unit
controller
• Detection of outdoor temperature and operation
revolution control
3. Contents of operation command signal
(Serial signal) from indoor unit controller to
outdoor unit controller
The following three types of signals are sent from
the indoor unit controller.
• Operation mode set on the remote controller
• Compressor revolution command signal defined
by indoor temperature and set temperature
(Correction along with variation of room temperature and correction of indoor heat exchanger
temperature are added.)
• Temperature of indoor heat exchanger
• For these signals ([Operation mode] and [Com-
pressor revolution] indoor heat exchanger temperature), the outdoor unit controller monitors the
input current to the inverter, and performs the
followed operation within the range that current
does not exceed the allowable value.
4. Contents of operation command signal
(Serial signal) from outdoor unit controller
to indoor unit controller
The following signals are sent from the outdoor unit
controller.
• The current operation mode
• The current compressor revolution
• Outdoor temperature
• Existence of protective circuit operation
For transferring of these signals, the indoor unit
controller monitors the contents of signals, and
judges existence of trouble occurrence.
Contents of judgment are described below.
• Whether distinction of the current operation
status meets to the operation command signal
• Whether protective circuit operates
When no signal is received from the outdoor
18. POWER SELECTION Mode ..................................................................................... 36
9-3. Auto Restart Function ..
9-3-1. How to Set the A uto Restart Function .............................. ........................................ 37
9-3-2. How to Cancel the Au to Restar t Function ................................................................. 38
9-3-3. Power Failure During Timer Operation .................................................................... 38
9-4. Remote Control
9-4-1. Remote Contr oller and its function ............................................................................ 39
9-4-2. Operation of remote control ...................................................................................... 39
9-4-3. Name and Functions of Indications on Remote Contr oller ........................................ 42
– 23−
9-2. Operation Description
FILE NO. SVM-12053
Item
1. Basic
operation
Operation flow and applicable data, etc.
1. Operation control
Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are
controlled.
1) The operation conditions are selected by the remote controller as shown in the below.
2) A signal is sent by ON button of the remote controller.
3) The signal is received by a sensor of the indoor unit and processed by the indoor controllers as
shown in the below.
4) The indoor controller controls the indoor fan motor and louver motor.
5) The indoor controller sends the operation command to the outdoor controller, and sends/receives
the control status with a serial signal.
6) The outdoor controller controls the operation as shown in the left, and also controls the compressor, outdoor fan motor, and pulse Modulating valve.
Selection of
operation conditions
ON/OFF
Remote controller
Control contents of remote controller
• ON/OFF (Air conditioner)
• Operation select (COOL/AUTO/DRY)
• Temperature setup
• Air direction
• Swing
• Air volume select (AUTO/LOW/LOW+/MED/MED+/HIGH)
•
ON timer setup
• OFF timer setup
• Hi-POWER
• Power selection
• COMFORT SLEEP
• QUIET
• PRESET
• ONE-TOUCH
Description
Signal receiving
Indoor unit control
Operation command
Serial signal send/receive
Serial signal send/receive
Outdoor unit control
Indoor unit
Indoor unit control
• Command signal generating function of
indoor unit operation
• Calculation function (temperature calculation)
• Activation compensation function of indoor fan
• Timer function
• Indoor heat exchanger release control
Outdoor unit
Outdoor unit control
• Frequency control of inverter output
• Waveform composite function
• Calculation function
(Temperature calculation)
• AD conversion function
• Delay function of compressor reactivation
• Current release function
• GTr over-current preventive
• Indoor fan motor
• Louver motor
~
Inverter
• Compressor
• Outdoor fan motor
• Pulse Modulating valve
(P.M.V.)
– 24−
Item
Operation flow and applicable data, etc.
FILE NO. SVM-12053
Description
1. Basic
operation
2. Cooling operation
The operations are performed in the following parts by controls according to cooling conditions.
1) Receiving the operation ON signal of the remote controller, the cooling operation signal
starts being transferred form the indoor controller to the outdoor unit.
2) At the indoor unit side, the indoor fan is operated according to the contents of “2. Indoor fanmotor control” and the louver according to the contents of “7. Louver control”, respectively.
3) The outdoor unit controls the outdoor fan motor, compressor and pulse Modulating valve
according to the operation signal sent from the indoor unit.
Operation ON
Indoor unit control
Sending of operation command signal
Outdoor unit control
3. AUTO operation
One of 2 operations (Cooling or Fan only) is selected according to difference between the preset
temperature and the room temperature at which the automatic operation has started, as shown in
follow figure. The Fan only operation continues unit the room temperature reaches a level at which
another mode is selected.
*1. When reselecting the operation mode, the fan
speed is controlled by the previous operation mode.
Setup of remote controller
Indoor fan motor control / Louver control / Operation Hz
Control (Requierment)
Compressor revolution control / Outdoor fan motor control /
Operation Hz control (Include limit control)
Pulse Modulating valve control
Ta
Cooling operation
Ts + 1
Monitoring (Fan)
4. DRY operation
DRY operation is performed according to the difference
between room temperature and the setup temperature as
shown below.
In DRY operation, fan speed is controlled in order to
prevent lowering of the room temperature and to avoid air
flow from blowing directly to persons.
[˚C]
Ta
+
1.0
+
0.5
L– (W5)
(W5+W3) / 2
SUL (W3)
Tsc
Fan speed
1) Detects the room temperature (Ta) when
the DRY operation started.
2) Star ts operation under conditions in the
left figure according to the temperature
difference between the room temperature and the setup temperature (Tsc).
Setup temperature (Tsc)
= Set temperature on remote controller
(Ts) + (0 to 1.0)
3) When the room temperature is lower
1°C or less than the setup temperature,
turn off the compressor.
− 25 −
Item
Operation flow and applicable data, etc.
FILE NO. SVM-12053
Description
2. Indoor fan
motor control
COOL ON
Fan speed setup
AUTO
Ta
[˚C]
+2.5
a
+2.0
b
+1.5
c
+1.0
<In cooling operation>
The indoor fan motor is operated in 5 stages in MANUAL
mode (Fig.1) and 5 stages in AUTO mode (Fig. 2)
Table 1 shown the indoor fan speed and air flow rate of
each mode.
MANUAL
(Fig. 1)
Indication
L
L+
M
M+
H
Fan speed
W6
(L + M) / 2
W9
(M + H) / 2
WC
(Fig. 2)
Air volume AUTO
M+(WB)
*3
*4
*5
*3 : Fan speed = [(M +) –L)] x 3/4 + L
*4 : Fan speed = [(M +) –L)] x 2/4 + L
*5 : Fan speed = [(M +) –L)] x 1/4 + L
* Symbols
UH: Ultra High
H: High
M+: Medium+
M: Medium
L+: Low+
L: Low
L-: Low–
UL: Ultra Low
SUL: Super Ultra Low
* The fan speed broadly varies due
to position of the louver, etc.
The described value indicates one
under condition of inclining
downward blowing.
1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is
performed with the constant
speed shown in Fig. 1.
2) When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 2 and Table 1
according to the setup temperature, room temperature, and heat
exchanger temperature.
d
+0.5
Tsc
e
L(W6)
(Table 1) Indoor fan air flow rate
Fan speed
level
WF
WE
WD
WC
WB
WA
W9
W8
W7
W6
W5
W4
W3
W2
W1
COOL
UH
H
M+
M
L+
L
L-
UL
SUL
DRY
UH
H
M+
M
L+
L
L-
UL
SUL
Fan speed
(rpm)
1000
1000
1000
980
920
870
860
800
750
740
700
700
650
500
500
(Linear approximation
from M+ and L)
RAS-18N3KCV
Air flow rate
(m3/h)
888
888
888
858
795
738
724
658
603
591
547
547
492
325
325
– 26 –
FILE NO. SVM-12053
Item
3. Outdoor fan
motor control
1) Outdoor unit
when the motor stopped.
Operation flow and applicable data, etc.
The speed of the outdoor unit side is controlled according
to speed of compressor motor (rps) and outdoor
temperature (To).
Air conditioner ON
(Remote controller)
Indoor unit controller
operation command
(Outdoor fan control)
2) Fan speed ≥ 400
YES
OFF status of
fan motor continues.
NO
Fan motor ON
Description
1) The operation command sent
from the remote controller is
processed by the indoor unit
controller and transferred to the
controller of the outdoor unit.
2) When strong wind blows at
outdoor side, the operation of air
conditioner continues with the fan
motor stopped.
3) Whether the fan is locked or not
is detected, and the operation of
air conditioner stops and an
alarm is displayed if the fan is
locked.
4) According to each operation
mode, by the conditions of
outdoor temperature (To) and
compressor revolution, the speed
of the outdoor fan shown in the
table is selected.
f 6f 9f 8f Bf Af E
f 5f 9f 7f Bf 9f E
f 3f 7f 5f 9f 7f B
f 1f 3f 1f 7f 3f 9
f 1f 3f 1f 5f 3f 7
f 0f 1f 0f 3f 1f 4
f 6f 9f 8f Bf Af B
f 5f 9f 7f Bf 9f B
f 3f 7f 5f 9f 7f B
f 1f 3f 1f 7f 3f 9
f 1f 3f 1f 5f 3f 7
f 0f 1f 0f 3f 1f 4
f 1f Ff 1f Ff 1f F
<
Alarm
display
Tap
f 0
f 1
f 2
f 3
f 4
f 5
f 6
f 7
RAS-18N3ACV
0
230
300
350
410
480
500
530
Tap
RAS-18N3ACV
f 8
f 9
f A
f B
f C
f D
f E
f F
560
640
670
700
800
800
850
850
– 27 –
Item
Operation flow and applicable data, etc.
FILE NO. SVM- 12053
Description
4. Capacity
control
Remote controllerIndoor unit
The cooling capacity depending on the load is adjusted.
According to difference between the setup value of tempera-
ture and the room temperature, the capacity is adjusted by
the compressor revolution.
Set temp. (Ts)
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed and rotor position
Correction value of Hz signal ≤ Operating Hz
Inverter output change
Commutation timing change
Room temp. (Ta)
1) The difference between set
temperature on remote controller
(Ts) and room temperature (Ta)
is calculated.
2) According to the temperature
difference, the correction value of
Hz signal which determines the
compressor speed is set up.
3) The rotating position and speed
of the motor are detected by the
electromotive force occurred on
the motor winding with operation
of the compressor.
4) According to the difference
resulted from comparison of the
correction value of Hz signal with
the present operation Hz, the
inverter output and the commutation timing are varied.
5) Change the compressor motor
speed by outputting power to the
compressor.
* The contents of control
operation are same in cooling
operation.
5. Current release
control
Outdoor unit inverter main
circuit control current
Operating current ≤
Setup value
Yes
Capacity control continues.
Outdoor temp.
Change of compressor speed
This function prevents troubles on the electronic parts of the
compressor driving inverter.
This function also controls drive circuit of the compressor
speed so that electric power of the compressor drive circuit
does not exceed the specified value.
Outdoor temp. To
Setup of current release point
No
Reduce compressor speed
Curent decrease
Current release value
RAS-18N3ACV
1) The input current of the outdoor
unit is detected in the inverter
section of the outdoor unit.
2) According to the detected
outdoor temperature, the
specified value of the current is
selected.
3) Whether the current value
exceeds the specified value or
not is judged.
4) If the current value exceeds the
specified value, this function
reduces the compressor speed
and controls speed up to the
closest one commanded from the
indoor unit within the range
which does not exceed the
specified value.
Release
protective
control by
temperature
of indoor
heat exchanger
7˚C
6˚C
5˚C
Operation flow and applicable data, etc.
<In cooling/dry operation>
(Prevent-freezing control for indoor heat exchanger)
In cooling/dry operation, the sensor of indoor heat
exchanger detects evaporation temperature and
controls the compressor speed so that temperature of
the heat exchanger does not exceed the specified
value.
Usual cooling capacity control
R
When the value is
in Q zone, the
Q
compressor speed
is kept.
P
FILE NO. SVM-12053
Description
1) When temperature of
the indoor heat exchanger
drops below 5°C, the
compressor speed is
reduced. (P zone)
2) When temperature of
the indoor heat exchanger
rises in the range from
6°C to under 7°C, the
compressor speed is
kept. (Q zone)
3) When temperature of
the indoor heat exchanger
rises to 7°C or higher,
the capacity control
operation returns to the
usual control in cooling
operation. (R zone)
Indoor heat exchanger temperature
7. Louver control
This function controls the air direction of the indoor unit.
• The position is automatically controlled initial setting of