Toshiba RAS-18N3KCV, RAS-18N3ACV, RAS-18SKCVX-T, RAS-18SACVX-T, RAS-22SKCVX-T Service Manual

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SERVICE MANUAL

AIR-CONDITIONER

SPLIT TYPE

FILE NO. SVM-12053

Indoor Unit

RAS-18N3KCV

Outdoor Unit

RAS-18N3ACV

SWI

-T OU

C H

F A

N F IX

ET P O

W E

E L

C O

S L

E EP

R410A

Sep, 2012

FILE NO. SVM-12053

CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 2

2. SPECIFICATIONS...................................................................................... 4

3. REFRIGERANT R410A ............................................................................. 6

4. CONSTRUCTION VIEWS ........................................................................ 14

5. WIRING DIAGRAM .................................................................................. 16

6. SPECIFICATIONS OF ELECTRICAL PARTS ......................................... 17

7. REFRIGERANT CYCLE DIAGRAM ........................................................ 18

8. CONTROL BLOCK DIAGRAM ................................................................ 20

9. OPERATION DESCRIPTION ................................................................... 22

10. INSTALLATION PROCEDURE ................................................................ 43

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.

– 3 –

2-1. Specifications

FILE NO. SVM-12053

2. SPECIFICATIONS

Unit model Indoor RAS-18N3KCV

Cooling capacity (kW) 5.0 Cooling capacity range (kW) 1.1-6.0

Power supply

Electric Indoor Operation mode Cooling 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

Wiring Power supply 3Wires:includes earth(Outdoor) connection Interconnection 4Wires:includes earth Usable temperature range Indoor (°C) 21~32

Accessory Indoor unit Installation plate 1

Outdoor RAS-18N3ACV

1Ph/50hz/220-240V 1Ph/60hz/220-230V

Power consumption (W) 40

Outdoor Operation mode Cooling

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

Type Twin rotary type with DC-inverter variable speed control Model DA131S1B-31FZ

Gas side (mm)

Outdoor (°C) -10~46

Wireless remote controller 1 Batteries 2 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

(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

105

100

Capacity Ratio (%)

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

R410A R22

0.80 0.80

1.00 1.00

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 –

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 6.35 0.8

3/8 9.52 0.8

1/2 12.70 0.8

5/8 15.88 1.0

Nominal

diameter

1/4 6.35 0.8

3/8 9.52 0.8

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

Flare tool for R22

clutch type

0 to 0.5

A (mm)

Conventional flare tool

Clutch type Wing nut type

1.0 to 1.5 1.5 to 2.0

1.0 to 1.5 2.0 to 2.5

A (mm)

Conventional flare tool

Clutch type Wing nut type

0.5 to 1.0 1.0 to 1.5

1/2 12.70 0.8

5/8 15.88 1.0

Table 3-2-5 Flare and flare nut dimensions for R410A

Nominal Outer diameter Thickness

diameter (mm) (mm)

1/4 6.35 0.8

3/8 9.52 0.8

1/2 12.70 0.8

5/8 15.88 1.0

– 8 –

0 to 0.5

Dimension (mm)

ABCD

9.1 9.2 6.5 13

13.2 13.5 9.7 20

16.0 16.6 12.9 23

19.0 19.7 16.0 25

0.5 to 1.0 1.5 to 2.0

Flare nut width

(mm)

Table 3-2-6 Flare and flare nut dimensions for R22

FILE NO. SVM-12053

Nominal Outer diameter Thickness

diameter (mm) (mm)

1/4 6.35 0.8

3/8 9.52 0.8

1/2 12.70 0.8

5/8 15.88 1.0

3/4 19.05 1.0

45˚ to 46˚

B A

Dimension (mm)

ABCD

9.0 9.2 6.5 13

13.0 13.5 9.7 20

16.0 16.2 12.9 20

19.0 19.7 16.0 23

23.3 24.0 19.2 34

43˚ to 45˚

Flare nut width

(mm)

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 6.35 14 to 18 (140 to 180)

torque wrenches available on the market

Tightening torque of

N•m (kgf•cm)

16 (160), 18 (180)

3/8 9.52 33 to 42 (330 to 420)

1/2 12.70 50 to 62 (500 to 620)

5/8 15.88 63 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.

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

Gas leakage check

Refrigerant charge

air-water heat pump installation

R410A

Existence of Whether conventional new equipment equipment can be for R410A used

Ye s ∗ (Note 1)

Ye s N o

∗ (Note 2) No

Conventional air-water heat pump installation

Whether new equipment can be used with conventional refrigerant

Ye s

∗ (Note 1)

Ye s

(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

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

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 system Knock out system

Heat exchanger

320

4. CONSTRUCTION VIEWS

Air Inlet

1050

Air filter

Air outlet

243

73.5 7

Drain hose (0.5m)

Connecting pipe (0.39m)

(Flare

72 78

132

525

Hanger Hanger

Connecting pipe (0.49m)

12.70)

Hanger

786

235

215 215

235

78 72

150 200 222 200 278

(Flare

Wireless remote controller

Remote controller holder

6.35)

For stud bold ( For stud bold (

6) 8~

172

149

17.5

10)

320

215.5

Hanger

262.5

Center line

262.5

Installation plate outline

– 14 –

Hanger

153.5

Outline of indoor unit

109

4-2. Outdoor Unit

FILE NO. SVM-12053

108 125

600

320

306

R5.5

6 hole

A detail Drawing (Back leg)

290

320

FAN-GUARD

436

550

275

25 Drain outlet

11 x 14

(For 8 -

Hole

10 anchor bolt)

306

320

6 hole

11x14 hole

36 50

B Detail Drawing (Front leg)

COVER-PV

9060090

320 342

100 or more

320

100 or more

Z View

600

Air intlel

Air outlel

600 or more

Installation dimension

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)

Liquid side (Flare 6.35)

Gas side

Flare ∅ 12.7)

– 15 –

5. WIRING DIAGRAM

4 5 6

2 3

9 10 11

2 3

7 8

1 2

4 5

2 3

1 32 587

FILE NO. SVM-12053

COMPRESSOR

1 1 2 2

3 3

YEL

BRW

YEL

ORN

121

REACTOR

RED WHI BLK

CN300

CN700

P02 WHI

BLK

3 3

WHI

2 2

RED

1 1

FAN MOTOR

6 6 5 5 4 4

PMV

3 3 2 2 1 1

PULSE MOTOR VALVE

3 3 2

CN603

1 1

2 2

CN602

1 1

3 3 2

CN601

1 1

(DISCHARGE PIPE

COLOR IDENTIFICATION

BLK:BLACK BLU:BLUE RED:RED GRY:GRAY PNK:PINK

(SUCTION PIPE

TEMP. SENSOR)

(OUTDOOR

TEMP. SENSOR)

WHI:WHITE BRW:BROWN ORN:ORANGE YEL:YELLOW PUR:PURPLE

P04 P05 P06

P25

P24

P23

P22

P21

P20

P35

P34

P19

P18 P11

P08

DB01

Q404

Q200~205 IGBT

POWER RELAY

DB02

P.C.BOARD

R221

(MCC-5009)

R220

R219

L03

C13

AC250V

C12 C14

P32

P33 P31 P30

PUR

YEL

F03

FUSE

T3.15A

Q300~305 MOS-FET

R321

R320

R319

ABSORBER

P07 BLK

SURGE

L01

VARISTOR

ORN

2 3

VARISTOR

F01 FUSE 25A AC250V

P01

P03

BLK

L N

~ ~ ~

POWER SUPPLY

(From Main Line)

Indoor Terminal Block

POWER SUPPLY (From Outdoor Unit)

CN01 (WHI)

(TA)

WP-027

CN10 (WHI)

Wireless Unit Assembly

CN11 (BLK)

CN62 (BLU)

CN61

(WHI)

WHI BLU BLU BLU BLU BLU BLU BLU BLU

T3.15A Fuse F01

Heat Exchanger Sensor

(TC)

Thermo Sensor

WHI

RED

BLK

CN51

Varistor

CN21

Main P.C Board

Line Filter

DC5V

DC12V

WP-020

Heat Exchanger

GRN&YEL

CN31 (WHI)

CN33 (WHI)

WHI YEL YEL YEL YEL

CN32 (WHI)

Power Supply Circuit

CN07 (WHI)

Fan Motor

Louver Motor

CN22 (WHI)

Color indication

YEL:YELLOW BLK:BLACK RED:RED BLU:BLUE WHI:WHITE

GRN&YEL: GREEN & YELLOW

AC Motor

– 16 –

6-1. Indoor Unit

FILE NO. SVM-12053

6. SPECIFICATIONS OF ELECTRICAL PARTS

No.

Fan motor (for indoor)

Room temp. sensor (TA-sensor)

Heat exchanger temp. sensor (TC-sensor)

Louver motor

6-2. Outdoor Unit

No.

Reactor

Outdoor fan motor

Suction temp. sensor (TS sensor)

Parts name

(18N3KCV)

Parts name

Type

AFS-220-31-4B

( — )

MSBPC20F04

Model name

CH-69-Z-T

ICF-140-43-4R

(Inverter attached)

Specifications

AC 220V, 31W

10kΩ at 25°C

4 phase, 16 pole, DC12V

Rating

L = 19mH, 10A

DC140V, 43W

10kΩ (25°C)

Discharge temp. sensor (TD sensor)

Outside air temp. sensor (TO sensor)

Terminal block (5P)

Compressor

Coil for PMV

(Inverter attached)

——

DA131S1B-31FZ

CAM-MD12TCTH-5

62kΩ (20°C)

10kΩ (25°C)

20A, AC250V

3-phases 4-poles 1100W

DC12V

– 17 –

7. REFRIGERANT CYCLE DIAGRAM

7-1. Refrigerant Cycle Diagram

INDOOR UNIT

Indoor heat

exchanger

Temp. measurement

FILE NO. SVM-12053

Pressure measurement Gauge attaching port

Vacuum pump connecting port Deoxidized copper pipe

Outer dia. : 12.7mm

Thickness : 0.8mm

Sectional shape of heat insulator

Accumulater tank

Compressor

DA131S1B-31FZ

Muffler

Cross flow fan

Deoxidized copper pipe Outer dia. : 6.35mm Thickness : 0.8mm

Outdoor heat

exchanger

Allowable height

difference : 10m

Strainer

Pulse Modulating valve at liquid side

Max. : 20m

Min. : 2m Chargeless : 15m

Charge : 20g/m (16 to 20m)

Allowable pipe length

Propeller fan

OUTDOOR UNIT

Refrigerant amount : 1.40kg

NOTE :

Gas leak check position Refrigerant flow

NOTE :

• 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

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) from the 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

unit controller, it is assumed as a trouble.

– 22 –

FILE NO. SVM-12053

9-2. Operation Description

1. Basic operation ........................................................................................................... 24

1. Operation control ................................................................................................... 24

2. Cooling operation .................................................................................................. 25

3. AUTO operation .....................................................................................................

4. DRY operation

2. Indoor fan motor control ............................................................................................. 26

3. Outdoor fan motor control........................................................................................... 27

4. Capacity control .......................................................................................................... 28

5. Current release control ............................................................................................... 28

6. Release protective control by temperature of indoor heat exchanger........................ 29

7. Louver control ............................................................................................................. 29

1) Louver position....................................................................................................... 29

2) Air direction adjustment ......................................................................................... 29

3) Swing ..................................................................................................................... 29

8. Temporary operation................................................................................................... 30

9. Discharge temperature control ................................................................................... 30

10. Pulse Modulating valve (P.M.V.) control ..................................................................... 31

11. Self-Cleaning function ................................................................................................ 32

12. Remote-A or B selection ............................................................................................ 34

13. QUIET mode ............................................................................................................. 35

14. COMFORT SLEEP mode ......................................................................................... 35

15. Short Timer ................................................................................................................ 35

16. One-Touch Comfort .................................................................................................. 36

........................................................................................................ 25

17. Hi-POWER Mode ...................................................................................................... 36

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

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 fan motor 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

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]

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

[˚C]

+2.5

+2.0

+1.5

+1.0

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

(L + M) / 2

(M + H) / 2

(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.

+0.5

Tsc

L(W6)

(Table 1) Indoor fan air flow rate

Fan speed

level

WF WE WD WC

WA W9

W8 W7 W6 W5 W4

W3 W2

COOL

M+

L+

L-

SUL

DRY

M+

L+

L-

SUL

Fan speed

(rpm)

1000 1000 1000

980 920 870 860

800

750 740

700

650

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.

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.

3) Fan lock

4) Motor operates as shown in the table below.

In cooling operation

Compressor speed (rps)

> 38

> 28

During ECO,

QUIET and

comfort sleep

When To is abnormal

To To To

To To

> 15 > 5 > 0.5 > 0.5 > 38 > 28 > 15 > 5 > 0.5 > 0.5

Outdoor fan speed (rpm)

YES

Air conditioner

OFF

< 22.1 < 50.3 50.3

MIN MAX MIN MAX MIN MAX

f 6 f 9 f 8 f B f A f E f 5 f 9 f 7 f B f 9 f E f 3 f 7 f 5 f 9 f 7 f B f 1 f 3 f 1 f 7 f 3 f 9 f 1 f 3 f 1 f 5 f 3 f 7 f 0 f 1 f 0 f 3 f 1 f 4 f 6 f 9 f 8 f B f A f B f 5 f 9 f 7 f B f 9 f B f 3 f 7 f 5 f 9 f 7 f B f 1 f 3 f 1 f 7 f 3 f 9 f 1 f 3 f 1 f 5 f 3 f 7 f 0 f 1 f 0 f 3 f 1 f 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

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

850

– 27 –

Item

Operation flow and applicable data, etc.

FILE NO. SVM- 12053

Description

4. Capacity control

Remote controller Indoor 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

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.

45°C 4.88A 40°C 44°C 6.65A 16°C 39°C 8.02A 11°C 15.5°C

10.5°C

– 28 –

Item

Release protective control by temperature of indoor heat exchanger

7˚C

6˚C

5˚C

Operation flow and applicable data, etc.

(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

When the value is in Q zone, the

compressor speed is kept.

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

"storage position" Louver : (Directs downward 37.4°).

• The set louver position is stored in memory by the microcomputer

and the louver returns to the stored position when the next operation is performed.

The angle of the louver is indicated as the louver closes fully is 0°.

1) Louver position

2) Air direction adjustment

Reduction of compressor speed

Cooling operation

AUTO (COOL)

Initial setting of "storage position" Louver : (Directs downward 37.4°)

Air direction

• The louver position can

be arbitrarily set up by pressing [FIX] button.

3) Swing

Horizontal

blowing

Inclined blowing

Blowing

downward

Inclined blowing

Horizontal

blowing

• Swing operation is performed in width 35° with the stop position as

the center.

• If the stop position exceeds either upper or lower limit position,

swing operation is performed in width 35° from the limit which the stop position exceeded.

– 29 –

• Swing

When pressing [SWING] button during operation, the louver starts swinging.

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