Toshiba RAS-13SKVR-E, RAS-16SKVR-E, RAS-16SAV-E SERVICE MANUAL

SERVICE MANUAL

Indoor Unit Outdoor Unit

FILE NO. SVM-07036

SPLIT TYPE

RAS-13SKV-E RAS-13SAV-E RAS-16SKV-E RAS-16SAV-E RAS-10SKVR-E RAS-10SAVR-E

RAS-13SKVR-E RAS-13SAVR-E RAS-16SKVR-E RAS-16SAVR-E

R410A

March, 2007

CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 3

2. SPECIFICATIONS ..................................................................................... 5

3. REFRIGERANT R410A ............................................................................. 7

4. CONSTRUCTION VIEWS ........................................................................ 15

5. WIRING DIAGRAM .................................................................................. 18

6. SPECIFICATIONS OF ELECTRICAL PARTS ......................................... 20

7. REFRIGERANT CYCLE DIAGRAM ........................................................ 21

8. CONTROL BLOCK DIAGRAM ................................................................ 25

9. OPERATION DESCRIPTION................................................................... 28

10. INSTALLATION PROCEDURE ................................................................ 56

11. HOW TO DIAGNOSE THE TROUBLE...................................................... 69

12. HOW TO REPLACE THE MAIN PARTS................................................... 92

13. EXPLODED VIEWS AND PARTS LIST ................................................. 110

– 2 –

1. SAFETY PRECAUTIONS

For general public use

Power supply cord of outdoor unit shall be more than 1.5 mm 2 (H07RN-F or 245IEC66) polychloroprene sheathed flexible cord.

• Read this “SAFETY PRECAUTIONS” carefully bef ore 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 SER VICING 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 PAR TS 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.

– 3 –

• 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 REGISTORS, 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 RESUL T 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 perf ormed 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.

– 4 –

2-1. Specifications

2. SPECIFICATIONS

Unit model Indoor RAS-10SKVR-E RAS-13SKV-E RAS-13SKVR-E RAS-16SKV-E RAS-16SKVR-E

Cooling capacity (kW) 2.5 3.5 3.5 4.5 4.5 Cooling capacity range (kW) 1.1-3.1 1.1-4.0 0.8-4.1 0.8-5.0 0.8-5.0 Heating capacity (kW) 3.2 4.2 4.2 5.3 5.5 Heating capacity range (kW) 0.9-4.8 0.9-5.0 0.9-5.8 0.9-6.2 0.9-6.9 Power supply 1Ph/50Hz/220-240V Electric Indoor Operation mode Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating characteristic Running current (A) 0.21-0.19 0.24-0.22 0.21-0.19 0.24-0.22 0.21-0.19 0.24-0.22 0.21-0.19 0.24-0.22 0.21-0.19 0.24-0.22

COP 4.18/4.27 3.27/3.72 3.50/3.89 2.82/3.42 3.23/3.62 Operating Indoor High (Cooling/Heating) (dB-A) 38/39 39/40 39/40 45/45 45/45 noise Medium (Cooling/Heating) (dB-A) 33/34 33/34 33/34 40/40 40/40

Indoor unit Unit model RAS-10SKVR-E RAS-13SKV-E RAS-13SKVR-E RAS-16SKV-E RAS-16SKVR-E

Outdoor unit Unit model RAS-10SAVR-E RAS-13SAV-E RAS-13SAVR-E RAS-16SAV-E RAS-16SAVR-E

Piping Type Flare connection Flare connection Flare connection Flare connection Flare connection connection Indoor unit Liquid side (mm) φ6.35 φ6.35 φ6.35 φ6.35 φ6.35

Refrigerant Name of refrigerant R410A R410A R410A R410A R410A

Wiring Power su pply 3Wires:includes earth (Outdoor) connection Interconnection Usable temperature range Indoor (Cooling/Heating) (℃) 21-32/0-28 21-32/0-28 21-32/0-28 21-32/0-28 21-32/0-28

Accessory Indoor unit Installation plate

* The specifications may be subject to change without notice for purpose of improvement.

Outdoor RAS-10SAVR-E RAS-13SAV-E RAS-13SAVR-E RAS-16SAV-E RAS-16SAVR-E

Power consumption (W) 35 40 35 40 35 40 30 35 30 35

Outdoor Operation mode Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating

Outdoor (Cooling/Heating) (dB-A) 46/47 48/50 48/50 49/50 49/50

Dimension Height (mm) 275 275 275 275 275

Net weight (kg)99999 Fan motor output (W)2020203030 Air flow rate (Cooling/Heating) (m3/min) 8.6/9.5 9.4/10.5 9.0/10.2 11.5/12.4 11.4/12.3

Dimension Height (mm) 550 550 550 550 550

Net weight (kg) 35 35 35 35 39 Compressor Motor output (W) 750 750 750 750 750

Fan motor output (W) 43 Air flow rate (Cooling/Heating) (m3/min) 30/30 35/35 37.5/37.5 35/35 36/32

Outdoor unit Liquid side (mm) φ6.35 φ6.35 φ6.35 φ6.35 φ6.35

Maximum length (m)2020202020 Maximum chargeless length (m) 15 15 15 15 15 Maximum height difference (m) 10 10 10 10 10

Weight (kg) 0.80 0.80 0.85 0.85 1.10

Outdoor unit Drain nipple

Power factor (%)75757575757565656565

Running current (A) 2.81-2.58 3.43-3.14 4.85-4.45 5.11-4.68 4.57-4.19 5.17-4.74 7.19-6.59 6.94-6.37 6.26-5.74 6.81-6.24 Power consumption (W) 563 710 1035 1090 965 1080 1565 1515 1365 1485 Power factor (%) 91 94 97 97 96 96 99 99 99 99 Starting current (A) 3.67-3.36 5.35-4.90 5.17-4.74 7.40-6.78 7.05-6.46

Low (Cooling/Heating) (dB-A) 26/28 26/28 26/28 30/31 30/31

Width (mm) 790 790 790 790 790 Depth (mm) 205 205 205 205 205

Width (mm) 780 780 780 780 780 Depth (mm) 290 290 290 290 290

Type Model DA89X1C-23FZ DA89X1C-23FZ DA111A1F-20F1 DA111A1F-20F1 DA111A1F-20F1

Gas side (mm) φ9.52 φ9.52 φ9.52 φ12.7 φ12.7

Outdoor (Cooling/Heating) (℃) -10-46/-15-24 -10-46/-15-24 -10-46/-15 -24 -10-46/-15-24 -10-46/-15-24

Wireless remote controller Batteries Remote contro ller holder Super Oxi Deo filter Super Sterilizer filte r Mounting screw Remote contro ller holder Mounting screw Plasma air purifier Installation manual Owner's manual

Water-proof rubber cap

Single rotary type with DC-inverter variablespeed control Twin rotary type with DC-inverter variablespeed control

4Wires:includes earth

1 1 2 1 1

6 (Ø4 x 25L)

2(Ø3.1 x 16L)

1 1 1 1 2

1 1 2 1 1 1

6 (Ø4 x 25L)

2(Ø3.1 x 16L)

1 1 1 2

1 1 2 1 1

6 (Ø4 x 25L)

2(Ø3.1 x 16L)

1 1 1 1 2

1 1 2 1 1 1

6 (Ø4 x 25L)

2(Ø3.1 x 16L)

1 1 1 2

6 (Ø4 x 25L)

2(Ø3.1 x 16L)

1 1 2 1 1

1 1 1 1 2

– 5 –

2-2. Operation Characteristic Curve

RAS-13SKVＲ-E

Current (A)

Capacity Variation Ratio According to Temperature

0 102030405060708090100110120

Compressor speed (rps)

RAS-10SKVＲ-E

RAS-16SKVR-E

RAS-16SKV-E

RAS-13SKV-E

RAS-13SKVR-E

Current (A)

0 102030405060708090100110120

Compressor speed (rps)

RAS-16SKVR-E

RAS-16SKV-E

RAS-10SKVR-E

RAS-13SKV-E

2-3. Capacity Variation Ratio According to Temperature

105

100

Capacity ratio (%)

Capacity ratio:100%=

2.5kW(RAS-10SKVR-E)

3.5KW(RAS-13SKV-E, RAS-13SKVR-E)

4.5kW(RAS-16SKV-E, RAS-16SKVR-E)

RAS-16SKV-E

RAS-10SKVR-E RAS-13SKVR-E RAS-16SKVR-E

RAS-13SKV-E

Conditions Indoor:DB27℃/WB19℃ Indoor air flow:High Pipe length:5m

120

100

Heating Capacity ratio (%)

RAS-10SKVR-E RAS-13SKV-E RAS-13SKVR-E RAS-16SKV-E RAS-16SKVR-E

Condition Indoor:DB20℃ Indoor air flow:High Pipe length:5m

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Outdoor temp. (℃)

-15 -10 -5 0 5 10 Outdoor temp. (℃)

– 6 –

3. REFRIGERANT R410A

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 concentr ation does not exceed the marginal le vel.

If the refrigerant gas leakage occurs and its concentration exceeds the marginal le vel, an oxygen starvation accident ma y 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’s 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 m ust 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.

– 7 –

Table 3-2-1 Thicknesses of annealed copper pipes

Thickness (mm)

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 sock et joints are as shown in Tab le 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

– 8 –

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 “dimen- sion A” by using a gauge for size adjustment.

Table 3-2-3 Dimensions related to flare processing for R410A

Nominal

diameter

Outer

diameter

(mm)

Thickness

(mm)

Fig. 3-2-1 Flare pr ocessing dimensions

Flare tool for R410A

clutch type

ØD

A (mm)

Conventional flare tool

Clutch type Wing nut type

1/4 3/8 1/2 5/8

Nominal

diameter

1/4 3/8 1/2 5/8

6.35

9.52

12.70

15.88

0.8

1.0

0 to 0.5 0 to 0.5 0 to 0.5 0 to 0.5

Table 3-2-4 Dimensions related to flare processing for R22

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

1.0

Flare tool for R22

clutch type

0 to 0.5 0 to 0.5 0 to 0.5 0 to 0.5

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

0.5 to 1.0 1.5 to 2.0

Nominal

diameter

1/4 3/8 1/2 5/8

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

Outer diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

1.0

Dimension (mm)

ABCD

9.1 9.2 6.5 13

13.2 13.5 9.7 20

16.6 16.0 12.9 23

19.7 19.0 16.0 25

– 9 –

Flare nut width

(mm)

17 22 26 29

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

Nominal

diameter

1/4 3/8 1/2 5/8 3/4

Outer diameter

(mm)

6.35

9.52

12.70

15.88

19.05

45˚ to 46˚

Thickness

(mm)

0.8

1.0

B A

Dimension (mm)

ABCD

9.0 9.2 6.5 13

13.0 13.5 9.7 20

16.2 16.0 12.9 20

19.7 19.0 16.0 23

23.3 24.0 19.2 34

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 b y 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 tighten-

ing torque, comply with values designated by man ufacturers. 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)

Tightening torque of torque

wrenches available on the market

N•m (kgf•cm)

1/4 3/8 1/2 5/8

6.35

9.52

12.70

15.88

14 to 18 (140 to 180) 33 to 42 (330 to 420) 50 to 62 (500 to 620) 63 to 77 (630 to 770)

– 10 –

16 (160), 18 (180)

42 (420) 55 (550) 65 (650)

3-3. Tools

3-3-1. Required T ools

The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R410A is changed to prev ent 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

air-water heat pump installation

No.

4 5 6

7 8

(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection

(Note 2) Charging cylinder for R410A is being currently developed.

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

margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.

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

Usage

Existence of new equipment for R410A

Yes

Yes Yes Yes

Yes

(Note 2)

R410A

Whether conventional equipment can be used

*(Note 1)

× ×

× × ×

× ×

Conventional air-water heat pump installation

Whether new equipment can be used with conventional refrigerant

*(Note 1)

× ×

General tools (Conventional tools can be used.)

In addition to the above exclusive tools, the f ollowing 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, Ø9.52)

3. Pipe cutter

4. Reamer

5. Pipe bender

6. Level vial

7. Screwdriver (+, –)

8. Spanner or Monke y 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

– 11 –

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.

(Water heat exchanger 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

– 12 –

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 allo y 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 perf orming 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.

– 13 –

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 o xide 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 prev ent 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

Copper - Iron

Iron - Iron

Used brazing filler

Phosphor copper

Silver Silver

Used flux

Do not use

Paste flux Vapor flux

1. Do not enter flux into the refrigeration cycle.

2. When chlorine contained in the flux remains within the pipe, the lubricating oil deteriorates. Therefore, use a flux which does not contain chlorine.

3. When adding water to the flux, use w ater which does not contain chlorine (e.g. distilled water or ion-exchange water).

4. Remove the flux after brazing.

Flow meter

Stop valve

Nitrogen gas

cylinder

From Nitrogen cylinder

Pipe

Nitrogen gas

Rubber plug

Fig. 3-5-1 Prevention of oxidation during brazing

– 14 –

4-1. Indoor Unit

4. CONSTRUCTION VIEWS

RAS-10SKVR-E

RAS-13SKVR-E RAS-16SKVR-E

Front panel

Knock out system

275

Air filter

116

Air inlet

Heat exchanger

Installation plate hanger

790

Plasma air purifier

Air ionizer

62 69

193480

Knock out system

205

Installation plate hanger

Connecting pipe (0.35m)

(For 10, 13 series; Flare

(For 16 series; Flare

84.5

Minimum

distance

to ceiling

275

170 or more

84.5 150 84.5

9.52mm)

12.7mm)

Hanger

621

235

215

Minimum

Hanger

distance to ceiling

160.5 160.5 150

Center line

Drain hose (0.50m)

Connecting pipe (0.40m)

(Flare 6.35mm)

235

215

65 or more

Hanger

Installation plate outline

84.5

Minimum

distance

to ceiling

170 or more

157

Wireless remote controller

125

Remote controller holder

185

– 15 –

4-2. Indoor Unit

RAS-13SKV-E RAS-16SKV-E

Front panel

Knock out system

275

Air filter

116

Air inlet

Heat exchanger

Installation plate hanger

790

62 69

193480

Knock out system

205

Installation plate hanger

Connecting pipe (0.35m) (For 13 series; Flare (For 16 series; Flare

84.5

Minimum

distance

to ceiling

275

170 or more

Hanger

84.5 150 84.5

9.52mm)

12.7mm)

Center line

621

235

215

Hanger

Minimum

distance to ceiling

235

215

160.5 160.5 150

Drain hose (0.50m)

Connecting pipe (0.40m)

(Flare 6.35mm)

84.5

65 or more

Minimum

distance

to ceiling

170 or more

Hanger

Installation plate outline

Wireless remote controller

Remote controller holder

185

157

125

– 16 –

4-3. Outdoor Unit

600

320

306

A detail Drawing (Back leg)

R5.5

6 hole

320

FAN-GUARD

436

550

25 Drain outlet

108 125

11 x 14

(For 8 -

Hole

10 anchor bolt)

306

320

6 hole

11x14 hole

36 50

B Detail Drawing (Front leg)

COVER-PV

290

275

100 or more

Z View

600

Air intlel

9060090

137

2 - R5-5 x 17L Ushape

(For ∅8 - ∅ 10 anchor bolt)

320 342

Electrical part cover

Liquid side (Flare 6.35)

Gas side (10,13

: Flare ∅9.52)

(16

: Flare ∅12..7)

Service port

321

100 or more

Air outlel

600 or more

Installation dimension

– 17 –

600 or more

2 - ∅11 x 14 Long holes (For ∅8- ∅10 anchor bolt)

5. WIRING DIAGRAM

5-1. RAS-13SKV-E / RAS-13SAV-E

RAS-10SKVR-E / RAS-10SAVR-E, RAS-13SKVR-E / RAS-13SAVR-E

– 18 –

5-2. RAS-16SKV-E / RAS-16SAV-E

RAS-16SKVR-E / RAS-16SAVR-E

– 19 –

6-1. Indoor Unit

6. SPECIFICATIONS OF ELECTRICAL PARTS

No.

Fan motor

(for indoor)

2 Room temp. sensor (TA-sensor)

3 Heat exchanger temp. sensor (TC-sensor)

4 Louver motor Output (Rated) 1W, 16 poles, DC12V

Parts name

13SKV-E

10SKVR-E,13SKVR-E

16SKV-E, 16SKVR-E DC 340V, 30W

MMF-240-20-4B AC240/220V, 20W

AFS-220-20-4AR AC240V, 20W

ICF-340-30-2B

( − )

MP24Z3T

10kΩ at 25°C

SpecificationsType

6-2. Outdoor Unit

No.

1 Reactor L = 10mH, 16A 2 Outdoor fan motor DC140V, 43W 3 Suction temp. sensor (TS sensor)

Parts name Model name Rating

CH-57

ICF-140-43-4R

(Inverter attached)

10kΩ (25°C) 4 Discharge temp. sensor (TD sensor) 5 Outside air temp. sensor (TO sensor) 6 Heat exchanger temp. sensor (TE sensor) 7 Terminal block (6P) 30A, AC600V

Compressor 3-phases 4-poles 750W

9 COIL FOR P.M.V. DC12V

10 Coil for 4-way valve AC220-240V

11 Compressor thermo

10SAVR-E, 13SAV-E 13SAVR-E, 16SAV-E, 16SAVR-E

(Inverter attached) (Inverter attached) (Inverter attached)

DA89X1C-23FZ

DA111A1F-20F1

C12A-01-R

VHV

PW-2AL OFF : 125±4°C, ON : 90±5°C

62kΩ (20°C)

10kΩ (25°C)

– 20 –

7. REFRIGERANT CYCLE DIAGRAM

7-1. Refrigerant Cycle Diagram

RAS-10SKVR-E / RAS-10SAVR-E

RAS-13SKV-E / RAS-13SAV-E

INDOOR UNIT

Indoor heat

exchanger

Temp. measurement

Pressure measurement Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe Outer dia. : 9.52mm Thickness : 0.8mm

4-way valve (STF-0108Z)

Muffler

Compressor DA89X1C-23FZ

Outdoor heat

exchanger

Cross flow fan

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

Sectional shape of heat insulator

Allowable height

difference : 10m

Strainer

Pulse Modulating valve at liquid side (SEV16RC9)

Strainer

Max. : 20m

Min. : 1m Chargeless : 15m

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

Allowable pipe length

Temp. measurement

Propeller fan

OUTDOOR UNIT

NOTE :

Refrigerant amount : 0.80kg

Gas leak check position Refrigerant flow (Cooling) Refrigerant flow (Heating)

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)

– 21 –

RAS-13SKVR-E / RAS-13SAVR-E

RAS-16SKV-E / RAS-16SAV-E

INDOOR UNIT

Indoor heat

exchanger

Temp. measurement

Pressure measurement Gauge attaching port

Vacuum pump connecting port Deoxidized copper pipe

Outer dia. : 9.52mm (13)

Thickness : 0.8mm

: 12.7mm (16)

4-way valve (STF-0108Z)

Muffler

Compressor DA111A1F-20F1

Outdoor heat

exchanger

Cross flow fan

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

Sectional shape of heat insulator

Split capillary

Ø1.2 x 80

Allowable height

difference : 10m

Strainer

Pulse Modulating valve at liquid side (SEV16RC9)

Max. : 20m

Min. : 1m Chargeless : 15m

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

Allowable pipe length

Temp. measurement

Propeller fan

OUTDOOR UNIT

Ø1.2 x 80

NOTE :

Refrigerant amount : 0.85kg

Gas leak check position Refrigerant flow (Cooling) Refrigerant flow (Heating)

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)

– 22 –

RAS-16SKVR-E / RAS-16SAVR-E

INDOOR UNIT

Indoor heat

exchanger

Temp. measurement

Pressure measurement Gauge attaching port

Vacuum pump connecting port Deoxidized copper pipe

Outer dia. : 12.7mm(16)

Thickness : 0.8mm

4-way valve (STF-0108Z)

Muffler

Compressor DA111A1F-20F1

Outdoor heat

exchanger

Cross flow fan

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

Sectional shape of heat insulator

Split capillary

Ø1.2 x 80

Allowable height

difference : 10m

Strainer

Pulse Modulating valve at liquid side (SEV16RC9)

Max. : 20m

Min. : 1m Chargeless : 15m

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

Allowable pipe length

Temp. measurement

Propeller fan

OUTDOOR UNIT

Ø1.2 x 80

NOTE :

Refrigerant amount : 1.10kg

Gas leak check position Refrigerant flow (Cooling) Refrigerant flow (Heating)

NOTE :

• The maximum pipe length of this air conditioner is 15 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)

– 23 –

7-2. Operation Data

Tempeature Heat exchanger

condition(°C)

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

27/19 35/- 10SKVR-E 0.9 to 1.1 12 to 14 37 to 39 High High 49

Model name Standard Indoor Outdoor Compressor RAS- pressure fan mode fan mode revolution

13SKV-E 0.8 to 1.0 11 to 13 39 to 41 High High 77 13SKVR-E 0.8 to 1.0 11 to 13 46 to 48 High High 63 16SKV-E 0.7 to 0.9 10 to 12 47 to 49 High High 89 16SKVR-E 0.8 to 1.0 11 to 13 40 to 42 High High 83

pipe temp.

Tempeature Heat exchanger

condition(°C) pipe temp.

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

20/- 7/6 10SKVR-E 2.5 to 2.7 39 to 41 0 to 3 High High 60

Model name Standard Indoor Outdoor Compressor

RAS- pressure fan mode fan mode revolution

13SKV-E 2.7 to 2.9 43 to 45 0 to 2 High High 80 13SKVR-E 2.6 to 2.8 41 to 43 0 to 2 High High 66 16SKV-E 2.5 to 2.7 39 to 41 0 to 2 High High 89 16SKVR-E 2.7 to 2.9 43 to 45 0 to 2 High High 83

NOTES :

1. Measure surface temperature of heat exchanger pipe around center of heat exchanger path U bent. (Thermistor themometer)

2. Connecting piping condition : 5 m

– 24 –

8-1. Indoor Unit

RAS-13SKV-E

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

M.C.U.

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

Indoor Unit Control Unit

Louver

Motor

Louver Motor Drive Control

Indoor Fan

Motor Control

Indoor

Fan Motor

From Outdoor Unit

220-240V

220V

50Hz

60Hz

REMOTE CONTROLLER

Serial Signal Communication

(Operation Command and Information)

Remote Controller

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Air Purifier

Infrared Rays, 36.7kHz

– 25 –

SLEEP

RAS-16SKV-E

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

M.C.U.

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

Indoor Unit Control Unit

Louver

Motor

Louver Motor Drive Control

Indoor Fan

Motor Control

Indoor

Fan Motor

From Outdoor Unit

220-240V

220V

50Hz

60Hz

REMOTE CONTROLLER

Serial Signal Communication

(Operation Command and Information)

Remote Controller

Operation (START/STOP)

Operation (START/STOP) Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Air Purifier

Infrared Rays, 36.7kHz

– 26 −

SLEEP

RAS-10SKVR-E, RAS-13SKVR-E

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

M.C.U.

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

Indoor Unit Control Unit

Louver

Motor

Louver Motor Drive Control

Indoor Fan

Motor Control

Indoor

Fan Motor

Air purifier

unit

Micro Switch

From Outdoor Unit

220-240V

220V

50Hz

60Hz

REMOTE CONTROLLER

Serial Signal Communication

(Operation Command and Information)

Remote Controller

Operation (START/STOP) Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

Infrared Rays, 36.7kHz

– 27 –

Air Purifier

SLEEP

RAS-16SKVR-E

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

M.C.U.

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

Indoor Unit Control Unit

Louver

Motor

Louver Motor Drive Control

Indoor Fan

Motor Control

Indoor

Fan Motor

Air purifier

unit

Micro Switch

From Outdoor Unit

220-240V

220V

50Hz

60Hz

REMOTE CONTROLLER

Serial Signal Communication

(Operation Command and Information)

Remote Controller

Operation (START/STOP) Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

Infrared Rays, 36.7kHz

– 28 –

Air Purifier

SLEEP

8-2. Outdoor Unit (Inverter Assembly)

detect

Current

circuit

Gate drive

detect

Current

Outdoor

Fan motor

Inverter

(DC → AC)

Compressor

P.M.V. : Pulse Motor Valve

M.C.U. : Micro Control Unit

MICRO-COMPUTER BLOCK DIAGRAM

M.C.U

MCC5009 (P.C.B) OUTDOOR UNIT

• PWM synthesis function

• Input current release control

circuit

Indoor unit

send/receive

circuit

Gate drive

• IGBT over-current detect control

• Outdoor fan control

• High power factor correction control

• Inverter output frequency control

• A/D converter function

• P.M.V. control

• Discharge temp. control

• 4-way valve control

• Signal communication to indoor unit

4MHz

Clock

frequency

circuit

High Power

factor Correction

Converter

(AC → DC)

sensor

Input current

Filter

Noise

Inverter

(DC → AC)

Relay

circuit

of P.M.V.

Driver circuit

valve

4-way

P.M.V.

220–240 V ~50Hz

For INDOOR UNIT

Discharge

temp. sensor

Outdoor air

temp. sensor

Suction temp.

– 29 –

sensor

temp.sensor

Heat exchanger

9. OPERATION DESCRIPTION

9-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air conditioner, which uses AC or DC motor for the indoor for motor and the outdoor fan motor. And the capacityproportional control compressor which can change the motor speed in the range from 11 to 96 rps is mounted. The DC motor drive circuit is mounted to the indoor unit. The compressor and the inverter to control fan motor are mounted to 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, and transfers the operation command to the outdoor unit controller.

The outdoor unit controller receives operation command from the indoor unit side, and controls the outdoor fan and the pulse Modulating valve. (P.M.V) Besides, detecting revolution position of the compressor motor, the outdoor unit controller controls speed of the compressor motor by controlling output voltage of the inverter and switching timing of the supply power (current transfer timing) so that motors drive according to the operation command. And then, the outdoor unit controller transfers reversely the operating status information of the outdoor unit to control the indoor unit controller.

As the compressor adopts four-pole brushless DC motor, the frequency of the suppl y 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) to the outdoor unit and judgment/display of error

• Air purifier operation control

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

• 4-way valve 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

• Defrost control in heating operation (Temp. measurement by outdoor heat exchanger and control for 4-way valve and outdoor fan)

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.

– 30 –

+ 90 hidden pages