Panasonic CS-A18DKD, CS-A24DKD, CU-A18DKD, CU-A24DKD Service Manual

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Order No. MAC0501007C3

Air Conditioner

CS-A18DKD CU-A18DKD CS-A24DKD CU-A24DKD

CONTENTS

Page Page

1 Features 2

2 Functions

2.1. Remote Control

2.2. Indoor Unit

2.3. Outdoor Unit

3 Product Specifications

3.1. CS-A18DKD CU-A18DKD

3.2. CS-A24DKD CU-A24DKD

4 Dimensions

4.1. Indoor Unit & Remote Control

4.2. Outdoor Unit

5 Refrigeration Cycle Diagram

6 Block Diagram

7 Wiring Diagram

8 Operation Details

8.1. Heating Operation 15

8.2. Cooling Operation

8.3. Soft Dry Operation

8.4. Automatic Operation

8.5. Operation Control

8.6. Indoor Fan Speed Control

8.7. Outdoor Fan Speed Control

8.8. Vertical Airflow Direction Control

8.9. Horizontal Airflow Direction Control

8.10. Powerful Operation

8.11. Quiet Operation

8.12. Ionizer Operation

8.13. Timer Control

8.14. Random Auto Restart Control

8.15. Remote Control Signal Receiving Sound

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

9 Operating Instructions 35

10 Installation Instructions

10.1. Safety Precautions

10.2. Indoor Unit

10.3. Outdoor Unit

11 2-way, 3-way Valve

11.1. Evacuation of the Equipment (For Europe & Oceania

Destination)

11.2. Air Purging of the Piping and Indoor Unit

12 Servicing Information

12.1. Indoor Electronic Controllers Removal Procedures

12.2. Cross Flow Fan and Indoor Fan Motor Removal

Procedures

12.3. Remote Control Reset

12.4. Auto OFF/ON Button

13 Troubleshooting Guide

13.1. Refrigeration cycle system

1 Features

• High efficiency.

• Compact design.

• Wider range of horizontal discharge air.

• Air Filter with function to reduce dust and smoke.

• Automatic air swing and manual adjusted by Remote

Control for horizontal and vertical airflow.

• Long installation piping up to 25 meter.

• Supersonic Air Purifying System with SUPER alleru-buster.

− Inactive various harmful airbone elements including

allergens, viruses and bacteria.

− Generated supersonic waves enhance the ability to collect dust and dirt in the air.

14 Technical Data 70

14.1. Thermostat characteristics

14.2. Operation characteristics

15 Exploded View (Indoor Unit)

15.1. CS-A18DKD CS-A24DKD

16 Replacement Parts List (Indoor Unit)

16.1. CS-A18DKD CS-A24DKD

17 Exploded View (Outdoor Unit)

17.1. CU-A18DKD CU-A24DKD

18 Replacement Parts List (Outdoor Unit)

18.1. CU-A18DKD CU-A24DKD

19 Electronic Circuit Diagram

19.1. Indoor Unit & Outdoor Unit

19.2. Remote Control

19.3. Print Pattern Indoor Unit Printed Circuit Board

19.4. Print Pattern Indicator & Receiver Printed Circuit Board

19.5. Print PatternOutdoor Unit Printed Circuit Board

• Serviceability Improvement

− Removable and washable Front Panel.

• Quality Improvement

− Random auto restart after power failure for safety restart

operation.

− Gas leakage detection.

− Prevent Compressor reverse cycle.

− Inner protector to protect Compressor.

− Noise prevention during soft dry operation.

− Blue coated Condenser for high resistance to corrosion.

− Anti-dew formation control (Cooling & Soft Dry).

− Overload Protection Control (Heating).

− Outdoor Fan Control.

− Compressor High Pressure Control.

• Operation Improvement

− Quiet mode to provide quiet operation.

− Powerful mode to reach the desired room temperature

quickly.

− Ionizer control for generating negative ion in discharge air.

− 24-hour timer setting.

2 Functions

2.1. Remote Control

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

OFF / ON

MODE

FAN SPEED

AIR SWING

POWERFUL

Operation Start/Stop

Operation Mode Selection

•

AUTO HEAT

COOL DRY

Automatic Operation Heating Operation Mode

Cooling Operation Soft Dry Operation

Indoor Fan Speed Selection

• FAN Low Fan Speed

•

FAN Medium Fan Speed

•

FAN High Fan Speed

•

AUTO Automatic Fan Speed FAN

Airflow Direction Control

• Vertical Automatic Airflow Direction Control and Manual Airflow Direction Control (5 stages of adjustment).

•

Horizontal Automatic Airflow Direction Control and Manual Airflow Direction Control (5 stages of adjustment).

Powerful Operation Start/Stop

TEMP.

ON-TIMER OFF-TIMER

< <

SET CANCEL

CLOCK

Room Temperature Setting

Cooling, Soft Dry Operation.

• Increase or decrease set temperature (16°C to 30°C)

Automatic Operation

Operation with 2°C higher than

•

standard temperature.

• Operation with standard temperature.

Operation with 2°C lower than

•

standard temperature.

Timer Operation Selection

• 24-hour, OFF / ON Real Timer Setting.

Time / Timer Setting

• Hours and minutes setting.

Timer Operation Set / Cancel

• ON Timer and OFF Timer setting and cancellation.

Clock Setting

• Current time setting.

QUIET

Quiet Operation Start/Stop

Ionizer Operation Start/Stop

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

2.2. Indoor Unit

AUTO

OFF / ON

Automatic Operation Button

• Press for < 5 second to operate Automatic operation mode.Use when the remote control cannot be used.

• Press for > 5 second to operate Cooling operation mode and compressor force to on (“beep” sound will be heard). Used when test running or servicing.

• Within 20 second of Cooling operation, press continuously for > 5 second to enter various setting mode. “beep, beep” sound will be heard. (Used to toggle remote control signal receiving sound or select remote control transmission code.)

Operation Indication Lamps (LED)

• POWER (Green) ........ Lights up in operation,

TIMER (Orange) ....... Lights up in Timer

•

QUIET (Orange) ........ Lights up in Quiet

POWERFUL (Orange) .. Lights up in Powerful

•

ION (Green) ........... Lights up in Ionizer

•

SUPER

•

ALLERU-BUSTER

Operation Mode

•

Heating, Cooling, Soft Dry and Automatic Operation.

Powerful Operation

• Reaches the desired room temperature quickly.

Timer Operation

•

Delay OFF/ON Timer control.

(Blue)

blinks in Automatic Operation judging.

Setting.

Operation.

...

Lights up in operation.

Quiet Operation

• To provide quiet operation.

Ionizer Operation

• Generate and discharge negative ion.

Random Auto Restart Control

• Unit will be restarted, when resume from power failure, at previous setting.

Anti-Freezing Control

• To prevent indoor heat exchanger from freezing.

Indoor Fan Speed Control

• Manual control fan speed (High, Medium and Low).

• Automatic fan speed

Airflow Direction Control

••Vertical airflow control can be adjusted automatically or manually by remote control. Horizontal airflow control can be adjusted automatically or manually by remote control.

Time Delay Safety Control

•

Restarting is inhibited for approximately 3 minutes.

7 Minutes Time Save Control

• To reduce the built up humidity inside the room.

Anti-Dew Formation Control

• Anti-Dew Formation Control for indoor unit discharge area.

Hot-Start Control

• To prevent cold air being discharge during Heating operation starts.

Anti Cold Draft Control

• To prevent the cold draft during Heating mode operation in thermo off condition.

2.3. Outdoor Unit

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Compressor Reverse Rotation Protection Control

• To protect compressor from reverse rotation when there is an instantaneous power failure.

Overload Protector

• Inner protector.

60 Secs. Forced Operation Control

• Once the compressor is activated, it does not stop within the first 60 secs. However, it stops immediately with remote control stop signal.

Outdoor Fan Operation Control

• 6-pole induction motor (2 speed). For Cooling or Soft Dry operation

•

Hi-speed ............. When outdoor

temperature reaches to 31°C.

Lo-speed ............. When outdoor

temperature reaches to 29°C. For Heating operation

•

Hi-speed ............. When outdoor

temperature reaches to 13.5°C.

Lo-speed ............. When outdoor

temperature reaches to 15.5°C. For Over-heating Protection, the Fan is

• switched ON or OFF depending on the piping temperature and the outdoor temperature.

Deice Control

• To prevent frosting at outdoor heat exchanger during Heating Operation.

4-Way Valve Control

• When the unit is switched to “OFF” during Heating Operation, 4-way valve stays at Heating position for 5 minutes.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

3 Product Specifications

3.1. CS-A18DKD CU-A18DKD

Unit CS-A18DKD CU-A18DKD

Power Source (Phase, Voltage, Cycle) ,V,Hz Single, 220 - 230, 50

Cooling Capacity kW (BTU/h) 5.30 (18,10 0) - 5.30 (18,100)

Heating Capacity kW (BTU/h) 5.65 (19,300) - 5.70 (19,400)

Moisture Removal l/h (Pint/h) 2.9 (6.1)

Airflow Method OUTLET

INTAKE

Air Volume Lo m3/min (cfm) Cooling; 13.1 (460) - 13.1 (460) 28.6 (1,010) - 31.1 (1,100)

Heating; 14.2 (500) - 14.2 (500)

Me m3/min (cfm) Cooling; 14.5 (510) - 14.5 (510) —

Heating; 14.7 (520) - 14.7 (520)

Hi m3/min (cfm) Cooling; 15.3 (540) - 15.3 (540) 50.7 (1,790) - 52.7 (1,860)

Heating; 16.0 (560) - 16.0 (560)

SHi m3/min (cfm) Cooling; 16.0 (560) - 16.0 (560) —

Noise Level dB (A) Cooling; High 43 - 43, Low 38 -38 Cooling; High 53 - 54

Heating; High 42 - 42, Low 38 -38 Heating; High 54 - 55

Electrical Data Input Power kW Cooling; 1.72 - 1.76

Running Current A Cooling; 8.0 - 7.8

EER W/W (BTU/hW) Cooling; 3.08 - 3.01 (10.52 - 10.28) COP W/W (BTU/hW) Heating; 3.42 - 3.33 (11.70 - 11.35) Starting Current A 44.5

Piping Conne ction Port (Flare piping)

Pipe Size (Flare piping)

Drain Hose

Power Cord Length m 1.9 —

Dimensions Height inch (mm) 10 - 13/16 (275) 29 - 17/32 (750)

Net Weight lb (kg) 24 (11.0) 132 (60.0) Compressor Description — Rotary (1 cylinder)

Inner diame ter mm 12 — Length mm 650 —

Number of core-wire 3 (1.5 mm2) —

Width inch (mm) 39 - 9/32 (998) 34 - 7/16 (875) Depth inch (mm) 9 - 1/16 (230) 13 - 19/32 (345)

Motor Type — Induction (2-poles) Rated Output kW — 1.5

inch inch

SIDE VIEW TOP VIEW

Heating; 1.65 - 1.71

Heating; 7.7 - 7.6

G ; Half Union 1/2”

L ; Half Union 1/4” G ; (gas side) 1/2”

L ; (liquid side) 1/4”

G ; 3-way valve 1/2”

L ; 3-way valve 1/4”

G ; (gas side) 1/2”

L ; (liquid side) 1/4”

rolling piston type

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Unit CS-A18DKD CU-A18DKD

Air Circulation Description Cross-flow Fan Propeller Fan

Material ASHT-18 PP Motor Type Transistor (8-poles) Induction (6-poles) Input W 50.0 - 50.0 150.3 - 150.3 Rated Output W 30 80 Fan Speed Low rpm Cooling; 1,160 - 1,160 460 - 490

Heating; 1,240 - 1,240

Medium rpm Cooling; 1,290 - 1,290 —

Heating; 1,290 - 1,290

High rpm Cooling; 1,360 - 1,360 815 - 830

Heating; 1,400 - 1,400

SuperHigh rpm Cooling; 1,400 - 1,400 —

Heat Exchanger Description Evaporator Condenser

Tube material Copper Copper Fin material Aluminium (Pre Coat) Aluminium Fin Type Slit Fin Corrugated Fin Row / Stage (Plate fin configuration, forced draft)

2×15 2×28 FPI 21 16 Size (W × H × L) mm 810 × 315 × 25.4 827.7

Refrigerant Control Device — Capillary Tube Refrigeration Oil (cm3) — SUNISO 4GDID or ATMOS

Refrigerant (R-22) g (oz) — 1,710 (60.4) Thermostat — — Protection Device — Inner Protector Capillary Tube Length mm — Cooling; 970, Heating; 820

Flow Rate l/min — Cooling; 11.0, Heating; 27.0 Inner Diameter mm — Cooling; 1.6, Heating; 2.2

Air Filter Material

Style

Capacity Control Capillary Tube Compressor Capacitor µF, VAC — 45 µF, 400/440VAC Fan Motor Capacitor µF, VAC — 3.5 µF, 440VAC

P.P.

Honeycomb

× 711.2 × 44

862.2

M60 or ATMOS 56M

—

Note:

• Specifications are subject to change without notice for further improvement.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

3.2. CS-A24DKD CU-A24DKD

Unit CS-A24DKD CU-A24DKD

Power Source (Phase, Voltage, Cycle) ,V,Hz Single, 220 - 230, 50

Cooling Capacity kW (BTU/h) 7.03 - 7.03 (24,00 0 - 24,000)

Heating Capacity kW (BTU/h) 7.80 - 7.80 (26,600 - 26,600 )

Moisture Removal l/h (Pint/h) 4.0 (8.5)

Airflow Method OUTLET

INTAKE

Air Volume Lo m3/min (cfm) Cooling; 13.7 (480) - 13.7 (480) 28.1 (990) - 29.9 (1,055)

Heating; 14.7 (520) - 14.7 (520)

Me m3/min (cfm) Cooling; 15.8 (560) - 15.8 (560) —

Heating; 15.8 (560) - 15.8 (560)

Hi m3/min (cfm) Cooling; 16.8 (590) - 16.8 (590) 49.7 (1,750) - 50.7 (1,790)

Heating; 17.6 (620) - 17.6 (620)

SHi m3/min (cfm) Cooling; 17.6 (620) - 17.6 (620) —

Noise Level dB (A) Cooling; High 47 - 47, Low 41 - 41 Cooling; High 53 - 54

Heating; High 46 - 46, Low 41 - 41 Heating; High 54 - 55

Electrical Data Input Power kW Cooling; 2.54 - 2.58

Running Current A Cooling; 12.3 - 12.2

EER W/W (BTU/hW) Cooling; 2.77 - 2.72 (9.45 - 9.30) COP W/W (BTU/hW) Heating; 3.08 - 3.05 (10.51 - 10.39) Starting Current A 65.0

Piping Conne ction Port (Flare piping)

Pipe Size (Flare piping)

Drain Hose

Power Cord Length m 1.9 —

Dimensions Height inch (mm) 10 - 13/16 (275) 29 - 17/32 (750)

Net Weight lb (kg) 26 (12.0) 139 (63.0) Compressor Description — Rotary (1 cylinder) rolling

Air Circulation Description Cross-flow Fan Propeller Fan

Inner diame ter mm 12 — Length mm 650 —

Number of core-wire 3 (2.5 mm2) —

Width inch (mm) 39 - 9/32 (998) 34 - 7/16 (875) Depth inch (mm) 9-1/16 (230) 13 - 19/32 (345)

Motor Type — Induction (2-poles) Rated Output kW — 2.0

Material ASHT-18 PP Motor Type Transistor (8-poles) Induction (6-poles) Rated Output W 30 80 Fan Speed Low rpm Cooling; 1,280 - 1,280 460 - 490

Medium rpm Cooling; 1,480 - 1,480 —

High rpm Cooling; 1,570 - 1,570 815 - 830

SuperHigh rpm Cooling; 1,650 - 1,650 —

inch inch

SIDE VIEW TOP VIEW

Heating; 2.53 - 2.56

Heating; 12.2 - 12.1

G ; Half Union 5/8”

L ; Half Union 1/4” G ; (gas side) 5/8”

L ; (liquid side) 1/4”

Heating; 1,380 - 1,380

Heating; 1,480 - 1,480

Heating; 1,650 - 1,650

G ; 3-way valve 5/8”

L ; 3-way valve 1/4”

G ; (gas side) 5/8”

L ; (liquid side) 1/4”

piston type

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Unit CS-A24DKD CU-A24DKD

Heat Exchanger Description Evaporator Condenser

Tube material Copper Copper Fin material Aluminium (Pre Coat) Aluminium Fin Type Slit Fin Corrugated Fin Row / Stage (Plate fin configuration, forced draft)

2×15 2×28 FPI 21 18 Size (W × H × L) mm 810 × 315 × 25.4 827.7

Refrigerant Control Device — Capillary Tube Refrigeration Oil (cm3) — SUNISO 4GDID or ATMOS

Refrigerant (R-22) g (oz) — 2,050 (72.4) Thermostat — — Protection Device — Inner Protector Capillary Tube Length mm — Cooling; 730, Heating; 340

Flow Rate l/min — Cooling; 12.5, Heating; 21.0 Inner Diameter mm — Cooling; 1.6, Heating; 2.0

Air Filter Material

Style

Capacity Control Capillary Tube Compressor Capacitor µF, VAC — 45 µF, 400/440VAC Fan Motor Capacitor µF, VAC — 3.5 µF, 440VAC

P.P.

Honeycomb

× 711.2 × 44.0

862.2

M60 or ATMOS 56M

—

Note:

• Specifications are subject to change without notice for further improvement.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

4 Dimensions

4.1. Indoor Unit & Remote Control

4.1.1. CS-A18DKD CS-A24DKD

4.2. Outdoor Unit

4.2.1. CU-A18DKD CU-A24DKD

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

5 Refrigeration Cycle Diagram

6 Block Diagram

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

7 Wiring Diagram

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8 Operation Details

8.1. Heating Operation

• Heating operation can be set using remote control.

• This operation is applied to warm the room temperature reaches the setting temperature set on the remote control.

• The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C

to 30°C.

• During Heating operation, the compressor will stop running and restart as shown in below figure.

8.1.1. Heating Operation Time Diagram

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.2. Cooling Operation

• Cooling operation can be set using remote control.

• This operation is applied to cool down the room temperature reaches the setting temperature set on the remote control.

• The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C

to 30°C.

• During cooling operation, the compressor will stop running and restart as shown in below figure.

8.2.1. Cooling Operation Time Diagram

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.3. Soft Dry Operation

• Soft Dry operation can be set using remote control.

• Soft Dry operation is applied to dehumidify and to perform a gentle cooling to the room.

• This operation starts when the intake air temperature sensor reaches the setting temperature on the remote control.

• When operation begins, Soft Dry will be switched “ON” for a maximum 10 minutes, then Soft Dry operation will be turned “OFF”

for a minimum 6 minutes. After that, the Soft Dry operation will be “ON” and “OFF” based on the setting temperature as shown in below figure.

• However after 3 minutes of compressor off, during Soft Dry “OFF” (within 6 minutes Soft Dry restart control), the indoor unit will start to operate at normal Cooling mode if the intake temperature is higher than Cooling “ON” point.

8.3.1. Soft Dry Operation Time Diagram

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.4. Automatic Operation

• Automatic operation can be set using remote control.

• This operation starts to operate with indoor fan at SLo speed for 25 seconds to judge the intake air temperature.

• After judged the temperature, the operation mode is determined by refering to the below standard.

• Then, the unit start to operate at determined operation mode, until it is switched off using remote control, with the setting

temperature as shown in below table.

• Operation mode will be determine again for judgement after 1 hour of operation, if the room temperature reaches to set temperature and compressor off time is over 7 minutes 30 seconds continuously.

The present mode will be continued, if the room temperature does not reach to set temperature (Compressor keeps running) eventhrough after 1 hour from automatic operation mode started.

Present Judgement Next Mode

Mode Cooling Soft Dry Heating

O O

Cooling 23°C Cooling (Judgement: Not Applicable (Judgement:

Heating 23°C & Above) Below 23°C)

O O

Soft Dry 20°C Soft Dry Not Applicable (Judgement: (Judgement:

Heating 20°C & Above) Below 20°C)

O O

Heating Cooling (Judgement: Not Applicable (Judgement:

25°C Heating 25°C & Above) Below 25°C)

• Automatic Set Temperature

For each operation, set temperature will automaticlly set as shown below.

• The setting temperature for all the operations can be changed one level up or one level down from the standard temperature as shown in below table by pressing on the temperature up or temperature down button at remote control.

Operation Hi (Standard) Lo

(+2°C) (±0°C) (-2°C)

Cooling 27°C 25°C 23°C

Soft Dry 24°C 22°C 20°C

Heating 23°C 21°C 19°C

• The operation mode judging temperature and standard setting temperature can be increased by 2°C permanently, by open the circuit of JX1 at indoor electronic controller.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.5. Operation Control

8.5.1. Restart Control (Time Delay Safety Control)

• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-

− Cooling/Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.

− Soft Dry operation - the compressor stops for 6 minutes (minimum) before resume operation.

• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation

stop, although the unit is turn on again within the period.

• This phenomenon is to balance the pressure inside the refrigerant cycle.

8.5.2. Compressor Reverse Rotation Protection Control

• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and indoor heat exchanger is 2.5°C (cooling mode)/5°C (heating mode) or less for continuous 2 minutes, compressor will stop and restart automatically.

• Time Delay Safety Control is activated before the compressor restart.

T = Intake air temperature - Indoor heat exchanger temperature

• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

(For 8.5.3. to 8.5.7. information applies only to Cooling and Soft Dry Operation)

8.5.3. 7 Minutes Time Save Control

• The compressor will start automatically if it has stopped for 7 minutes and the intake air temperature falls between the compressor ON temperature (A) and compressor OFF temperature (B) during the period.

• This phenomenon is to reduce the built up humidity inside a room.

8.5.4. 60 Seconds Forced Operation

• Once the air conditioner is turned on, the compressor will not stop within 60 seconds in a normal operation although the intake air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the remote control is permitted.

• The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and return back to the outdoor unit.

8.5.5. Starting Current Control

• When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to operate at 1.6 second later.

• The reason of the difference is to reduce the starting current flow.

8.5.6. Anti-Freezing Control

• If the temperature of the indoor heat exchanger falls below 2°C continuously for 4 minutes or more, the compressor turns off. The fan speed setting remains the same.

• This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form returning to the compressor.

• Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).

• Restart control (Time Delay Safety Control) will be applied in this Control if the recovery time is too short.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.5.7. Anti-Dew Formation Control

• Purpose is to prevent dew formation on indoor unit air discharge area.

• When room temperature is constant (±1°C) the following conditions occur for 30 minutes continuously, anti-dew formation will

activate:

− Remote Control setting temperature is less than 25°C.

− Compressor is on.

− Cooling operation mode.

− Indoor Fan motor operate at Low fan speed or QLo.

• This control is cancelled immediately when above condition is changed.

• Anti-Dew formation is control by:

1. Increasing Air Flow Volume

a. Lo fan speed

Lo fan speed is changed to Lo+ after 30 min to prevent dew formation.

b. QLo fan speed

Dew formation may occurs at QLo cool, therefore QLo cool is operated only 1 hr 30 min (1 hr QLo, 30 min QLo +100 rpm). After that, it operates at QLo +180rpm (However Quiet LED remains on).

2. Norrowing

Vertical Airflow Direction

− During Anti-dew condensation prevention, Airflow Direction Auto-control angle change from 10° - 38° to 10° - 27° under Cooling and Soft Dry operation mode.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

− During Anti-dew condensation prevention, Airflow Direction Manual control angle change from 10°, 14°, 18°, 22°, 27° to 10°, 13°, 16°, 19°, 22° under Cooling and Soft Dry operation mode.

3. Narrowing

Horizontal Airflow Direction

− During Anti-dew condensation prevention, Airflow Direction Auto-control angle change from 0° - 44° to 14° - 30° under Cooling and Soft Dry operation mode.

− During Anti-dew condensation prevention, Airflow Direction Manual control angle change from 0°, 11°, 22°, 33°, 44° to 14°, 18°, 22°, 26°, 30° under Cooling and Soft Dry operation mode.

(For 8.5.8. to 8.5.13. information applies only to Heating Operation)

8.5.8. Overload Protection Control

• Outdoor Fan Control

− If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop, when Outdoor

Heat Exchanger temperature is T

The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.

or more according to Outdoor Air Temperature region as table below:

− During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

• Compressor high pressure protection

− If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.

− Time Delay Safety Control is activated before the compressor restart.

8.5.9. 4-Way Valve Control

• 4-way valve always on during Heating operation. (except deicing operation)

• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating position for 5 minutes.

• This is to prevent the refrigerant flow process sound for being occur.

8.5.10. Outdoor Fan Motor Control

• When compressor stops (reaches room temperature), outdoor fan will operate for 30 seconds (forced operation).

• This is to release the heat and to obtain the lowest pressure as fast as possible.

8.5.11. Hot Start Control

• Hot Start Control is to prevent cool air discharge into the room when heating operation start.

• When Heating operation starts, Indoor fan will not start until the indoor heat exchanger reaches 30°C as diagram shown.

• Hot start is completed when indoor heat exchanger rises to 42°C or operation over 4 minutes.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8.5.12. Anti Cold Draft Control

• This operation is to prevent the Cold Draft during Heating mode operation.

• The operation will start when compressor OFF (Thermo OFF) during Heating operation.

• For the first 30 sec. from compressor OFF (Termo OFF), Indoor fan speed will operate accordingly to the Indoor heat exchanger

temperature as shown below:

• After 30 sec. from compressor OFF (thermo OFF), Indoor fan will run at SSLo speed only.

• Anti Cold Draft Control will stop when:

− Intake temperature < set temperature. (Time Delay Safety Control 4 minutes waiting is valid)

− 30 Minutes Time Save Control activates.

8.5.13. Deicing Control

Deice starts to prevent frosting at outdoor heat exchanger.

• Normal Deicing

Deice operations detection commences after 60 minutes of Heating operation starts or 60 minutes after previous deice operation. If the TRS (Thermal Read Switch) senses the outdoor piping temperature drops to -4°C (TRS CLOSE) or less for 50 sec. continuously during compressor is in operation, deice will start.

(There is no detection during Outdoor Fan stops.)

• Overload Deicing

During heating operation, if the outdoor Fan OFF duration (due to overload control) is accumulated up to 60 minutes and after compressor starts for 1 minutes, deicing starts.

• Deicing ends when

1. 12 minutes after deicing operation starts;

2. The outdoor piping temperature rises to 12°C.

• After deicing operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds.

Normal Deicing Time Diagram

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Overload Deicing Time Diagram

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8.6. Indoor Fan Speed Control

• Indoor Fan Speed can be set using remote control.

8.6.1. Fan Speed Rotation Chart

Fan Speed CS-A18DKD CS-A24DKD

Cool, Dry Heat

SHi Hi 1460 1650

Hi - 1400 1590

Me Me 1320 1480

Lo+ Lo 1270 1380

Lo - 1190 1280

Lo- Lo- 980 1070

SLo SLo 760 830

- SSLo 300 300

QSHi QHi 1360 1550

QHi - 1300 1490

QMe QMe 1220 1380

- QLo 1170 1280

QLo - 1090 1180

8.6.2. Automatic Fan Speed Control

• When set to Auto Fan Speed, the fan speed is adjusted between maximum and minimum setting as shown in the table.

− Fan speed rotates in the range of Hi and Me.

− Deodorizing Control will be activated.

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• Auto Fan Speed during Cooling operation:

1. Indoor fan will rotate alternately between off and on as shown in below diagram.

2. At the beginning of each compressor start operation, indoor fan will increase fan speed gradually for deodorizing purpose.

3. For the first time the compressor operate, indoor fan will be switched to Hi fan speed from SLo after 70 seconds from the start of compressor. This cause the room temperture to achieve the setting temperature quickly.

4. During compressor stop, indoor fan will operate at SLo for the beginning 20 seconds to prevent higher volume of refrigerant in liquid form returning to the compressor.

5. After the compressor at turn off condition for 3 minutes, indoor fan will start to operate at SLo to circulate the air in the room. This is to obtain the actual reading of the intake air temperature.

6. When the compressor resume operation, indoor fan will operate at Me fan speed (after 70 seconds from the restart of compressor) to provide comfort and lesser noise environment.

• Auto Fan Speed during Soft Dry operation:

1. Indoor fan will rotate alternately between off and Lo-.

2. At the beginning of each compressor start operation, indoor fan will increase fan speed gradually for deodorizing purpose.

3. When compressor at turn off condition for 6 minutes, indoor fan will start fan speed at Lo- to circulate the air in the room. This is to obtain the actual reading of intake air temperature.

• Auto Fan Speed during Heating operation.

1. Indoor fan will rotate in the range of SLo → Me according to the heat exchanger temperature.

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8.6.3. Manual Fan Speed Control

• Manual fan speed adjustment can be carried out by using the Fan Speed selection button at the remote control.

• There are 3 types of fan speed settings: Lo, Me, Hi.

8.7. Outdoor Fan Speed Control

• There is only one speed for outdoor fan motor.

• When the air conditioner is turned on, the compressor and the outdoor fan will operate simultaneously.

• Likewise, both compressor and outdoor fan will stop at the same time if the unit is turned off.

8.8. Vertical Airflow Direction Control

8.8.1. Auto Control

(Cooling and Soft Dry Operation condition)

• When the vertical airflow direction is set to Auto using the remote control, the louver swings up and down as shown in the diagram.

• When stop operation using the remote control, the discharge vent is reset, and stop at the closing position.

• During Cooling operation or Soft Dry operation, indoor fan motor may stop to rotate at certain periods. At that condition, the louver will stop swinging and rest at the upper limit.

(Heating Operation condition)

• When the intake air temperature reaches 38°C, the louver is changed from upper to lower limit. When the intake air temperature falls to 35°C, the louver is changed from louver to upper limit.

Cooling and Soft Dry Operation

Heating Operation

8.8.2. Manual Control

• When the vertical airflow direction is set to Manual using the remote control, the automatic airflow is released and the airflow direction louver move up and down in the range shown in the diagram.

• The louver can be adjusted by pressing the button to the desired louver position.

• When stop operation using the remote control, the discharge vent is reset, and stop at the closing position.

8.9. Horizontal Airflow Direction Control

8.9.1. Auto Control

• When the horizontal airflow direction is set to Auto using the remote control, the vanes swings left and right as shown in the diagram.

• When stopped with remote control, the discharge vane is reset, and stop at the reset position.

• During Cooling operation or Soft Dry operation, indoor fan motor may stop to rotate at certain periods. At that condition, the vane will stop swinging and rest at 22° angle.

8.9.2. Manual Control

• When the horizontal airflow direction is set to Manual using the remote control, the automatic airflow is released and the airflow direction vane move left and right in the range shown in the diagram.

The louver can be adjusted by pressing the button to the desired vane position.

• When stopped with remote control, the vanes is reset, and stopped at reset position.

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8.10. Powerful Operation

• The Powerful operation is to achieve the setting temperature quickly.

(Cooling and Soft Dry Operation condition)

• When Powerful operation is set, the setting temperature will be automatically decreased 3°C internally against the present setting temperature (Lower temperature limit: 16°C).

• This operation automatically will be running under SHi Fan Speed (Cooling), Lo- Fan Speed (Soft Dry).

• Vertical Airflow Direction:-

- In “Manual” setting, the vane will automatically shift down 10° lower than previous.

- In “Auto” setting, the vane will automatically swing up and down. However the lower limit will be shifted 10° downward.

(Heating Operation condition)

• When Powerful operation is set, the setting temperature will be automatically increased 3°C against the present setting temperature (Higher temperature: 30°C).

• The Fan Speed will shift as shown below:

• Vertical Airflow Direction:-

- In “Manual” setting, the vane will automatically shift down 5° lower than previous setting.

- In “Auto” setting, the vane will automatically shift between upper and lower limit depending on the intake air temperature as Heating Mode, Airflow Direction Auto-Control. However the upper and lower limit will be shifted 5° downward.

• Powerful Mode will operate for 15 minutes only and operation will shift back to previous setting mode.

• Powerful operation stops when:-

- Powerful operation has operate for 15 minutes.

- Powerful button is pressed again.

- Quiet button is pressed.

- Stopped by OFF/ON operation button.

- Timer OFF activates.

- Operation mode is changed.

8.11. Quiet Operation

• The Quiet operation is to provide quiet cooling/heating operation condition compare to normal operation.

(Cooling and Soft Dry Operation condition)

• Once the Quiet Mode is set at the remote control, the Quiet Mode LED illuminated. The sound level will reduce either around 2 dB(A) for Lo fan speed or 3 dB(A) for Hi/Me fan speed against the present sound level operation.

• Dew formation become severe at Quiet Lo cool, therefore Quiet Lo cool is operated only 1hr 30 min (1hr QLo, 30 min QLo + 50rpm). After that, it goes back to Lo cool (However Quiet LED remains on).

• Manual Airflow Direction:-

− RPM control during Lo cool

− RPM control during Hi & Me cool

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• Auto Airflow Direction:-

(Heating Operation condition)

• When the Quiet Mode is set at the remote control, Quiet Mode LED illuminates. The sound level will reduce either around 2 dB(Lo) or 3 dB(Hi, Me), against the present sound level operation.

• Quiet setting of fan speed rpm refer to Indoor Fan Speed Control.

• Manual Airflow Direction:-

− Rpm control during Lo, Me & Hi Cool

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• Auto Airflow Direction:-

− Rpm control depends on the piping air temperature sensor of Indoor heat exchanger

• Quiet operation stops when:-

− Quiet/Powerful button is pressed again.

− Stopped by OFF/ON operation button.

− Timer OFF activates.

− Operating mode is changed.

8.12. Ionizer Operation

• The Ionizer operation is to provide fresh air effect to user by producing minus ion in discharge air.

8.12.1. Operation Control

1. Ionizer individual operation

a. When air-conditioner unit is at “OFF” condition (standby) and ION operation button at the remote control is pressed, the

Ionizer and Air Circulation operations will turn on. Only ION LED will illuminates. Power LED maintain off. (1 → 2)

b. Ionizer individual operation can be turned off by pressing the ION button again. (2 → 1)

c. Fan speed can be adjusted later by customer during this operation.

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d. Vertical airflow direction can be adjusted using remote control during Ionizer individual operation.

e. During Ionizer individual operation, operated mode (Auto, Cool, Dry, Heat) can be activated by turning on the OFF/ON

operation button. (2 → 4)

f. If power failure occur during Ionizer individual operation, after power resume, Ionizer operation will be activated immediately.

g. When the Ionizer circuit feedback process error occur for 24 times (about 11hr 30 min.), Ionizer and Air Circulation

operations will turn off with ION LED blinks continuously.

(For details, please refer to Ionizer Error detection control)

2. Operation mode & Ionizer operation.

a. When air-conditioner unit is at “ON” condition and ION operation button at the remote control is pressed, the Ionizer

operation will turn on. ION & Power LED will illuminate. (3 → 4)

b. Ionizer operation stops when:

• ION operation button is press again.

• Stopped by OFF/ON operation button.

• Timer OFF activates.

• Ionizer circuit feedback signal shows error.

c. Ionizer operation status is not memorised when the air conditioner has been switched off. The air-conditioner will operate

without ionizer operation when it is turned on again. However, if power failure occurs during Ionizer operation together with Cooling operation, air-conditioner will start to operate at Cooling operation with Ionizer operation when the power is resumed.

8.12.2. Error Detection Control

• The error detection control is to inform user that error occurs at ionizer system and repairing job will be needed.

• There are two types of error detection control:

a. When Ionizer is ON

− If ionizer feedback = Lo for 24 times within 11hr 30min, ION LED blinks continuously.

b. When ionizer is OFF

− If ionizer feedback = Hi, ION LED blinks continuously.

• During ionizer at breakdown condition, if ionizer feedback voltage = Lo (become normal), ION LED will stop blinking.

• The error detection control can be reset by:

i) Pressing the OFF/ON operation button to switch the operation OFF.

ii) Pressing the Auto Operation button to force the operation OFF.

iii) Setting the OFF Timer to stop the operation (Not applicable when ionizer is OFF).

8.13. Timer Control

8.13.1. Delay ON Timer

• When the Delay ON Timer is set by using the remote control, the unit will start to operate slightly before the set time, so that the room will reach nearly to the set temperature by the set time.

• For Cooling and Soft Dry operation, the operation will start 15 minutes before the set time.

• For Heating operation, the operation will start 30 minutes before the set time.

• For Automatic operation, the indoor fan will operate at SLo speed for 20 seconds, 15 minutes before the set time to detect the

intake air temperature to determine the operation mode. The operation indication lamp will blink at this time.

8.13.2. Delay OFF Timer

• When the Delay OFF Timer is set by using the remote control, the unit will stop operate according to the desired setting.

Notes:

1. By pressing OFF/ON operation button, the Delay ON Timer or Delay OFF Timer setting will not be cancelled.

2. To activate the previous timer setting, press SET/CANCEL button once again.

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8.14. Random Auto Restart Control

• If there is a power failure during operation, the air conditioner will automatically restart after 3 to 4 minutes when the power is resumed.

• It will start with previous operation mode and airflow direction.

• If there are more than one air conditioner unit in operation and power failure occur, restart time for each unit to operate will be

decided randomly using 4 parameters:- intake air temperature, setting temperature, fan speed and air swing louver position.

• This Random Auto Restart Control is not available when Timer is set.

• This control can be omitted by open the circuit of JX2. (Refer Circuit Diagram)

8.15. Remote Control Signal Receiving Sound

• Long beep sound will be heard when:-

− Stopping the air conditioner using OFF/ON operation button.

− Stopping the Quiet Mode.

− Stopping the Powerful Mode.

− Stopping the Ion Mode.

• Short beep sound will be heard for other setting.

• To switch off the beep sound:-

Press the “Auto Operation Button” (behind the front grille) continuously for 10 seconds or more (“beep” “beep” will be heard at the 10th second). Repeat the above if you want to switch on the beep sound.

However, if the “Automatic Operation Button” has been pressed the Automatic operation will be activated. If you do not require

this operation, you may change it by using the remote control.

9 Operating Instructions

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10 Installation Instructions

Required tools for Installation Works

1. Philips screw driver 5. Spanner 9. Gas leak detector 13. Multimeter

2. Level gauge 6. Pipe cutter 10. Measuring tape 14. Torque wrench

3. Electric drill, hole core drill (ø70 mm)

4. Hexagonal wrench (4 mm) 8. Knife 12. Megameter 16. Gauge manifold

7. Reamer 11. Thermometer 15. Vacuum pump

10.1. Safety Precautions

• Read the following “SAFETY PRECAUTIONS” carefully before installation.

• Electrical work must be installed by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit

for the model to be installed.

• The caution items stated here must be followed because these important contents are related to safety. The meaning of each indication used is as below. Incorrect installation due to ignoring of the instruction will cause harm or damage, and the seriousness is classified by the following indications.

This indication shows the possibility of causing death or serious injury.

18 N.m (1.8 kgf.m) 55 N.m (5.5 kgf.m) 65 N.m (6.5 kgf.m)

This indication shows the possibility of causing injury or damag e to properties only.

The items to be followed are classified by the symbols:

Symbol with background white denotes item that is PROHIBITED from doing.

• Carry out test running to confirm that no abnormality occurs after the installation. Then, explain to user the operation, care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference.

1. Engage dealer or specialist for installation. If installation done by the user is defective, it will cause water leakage, electrical shock or fire.

2. Install according to this installation instruction strictly. If installation is defective, it will cause water leakage, electrical shock or fire.

3. Use the attached accessories parts and specified parts for installation. Otherwise, it will cause the set to fall, water leakage, fire or electrical shock.

4. Install at a strong and firm location which is able to withstand the set’s weight. If the strength is not enough or installation is not properly done, the set will drop and cause injury.

5. For electrical work, follow the local national wiring standa rd, regulation and this installation instructions. An independent circuit and single outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.

6. Use the specified cable (2.5 mm2) and connect tightly for indoor/outdoor connection. Conne ct tightly and clamp the cable so that no external force will be acted on the terminal. If connection or fixing is not perfect, it will cause heat-u p or fire at the connection.

7. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause heat-up at connection point of terminal, fire or electrical shock.

8. When carrying out piping connection, take care not to let air substances other than the specified refrigerant go into refrigeration cycle. Otherwise, it will cause lower capacity, abnorm al high pressure in the refrigeration cycle, explosion and injury.

9. Do not damage or use unspecified power supply cord. Otherwise, it will cause fire or electrical shock.

10. Do not modify the length of the power supply cord or use of the extension cord, and do not share the single outlet with other electrical applian ces. Otherwise, it will cause fire or electrical shock.

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1. This equipment must be earthed. It may cause electrical shock if grounding is not perfect.

2. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire.

3. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture.

1. Selection of the installation location. Select an installation location which is rigid and strong enough to support or hold the unit, and select a location for easy maintenance.

2. Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of the following method. Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency. In some countries, permanent connection of this air conditioner to the power supply is prohibited.

1. Power supply connection to the receptacle using a power plug.

Use an approved 16A power plug with earth pin for 2.0HP (A18DK) and 20A for 2.5HP (C24DK, A24DK) for the connection to the receptacle.

2. Power supply connection to a circuit breaker for the permanent connection. Use an approved 16A circuit breaker for 2.0HP (A18DK)

and 20A for 2.5HP (C24DK, A24DK) for the permanent connection. It must be a double pole switch with a minimu m 3.5 mm contact gap.

3. Do not release refrigerant. Do not release refrigerant during piping work for installation, re-installation and during repairing a refrigeration parts. Take care of the liquid refrigerant, it may cause frostbite.

4. Installation work. It may need two people to carry out the installation work.

5. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

Attached accessories

Applicable piping kit

CZ-4F5, 7, 10AN (A18DK)

CZ-52F5, 7, 10AN (C24DK, A24DK)

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Indoor/Outdoor Unit Installation Diagram

SELECT THE BEST LOCATION

INDOOR UNIT

• There should not be any heat source or steam near the unit.

• There should not be any obstacles blocking the air circulation.

• A place where air circulation in the room is good.

• A place where drainage can be easily done.

• A place where noise prevention is taken into

consideration.

• Do not install the unit near the door way.

• Ensure the spaces indicated by arrows from the wall,

ceiling, fence or other obstacles.

• Recommended installation height for indoor unit shall be at least 2.3 m.

OUTDOOR UNIT

• If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from the condenser is not obstructed.

• There should not be any animal or plant which could be affected by hot air discharged.

• Keep the spaces indicated by arrows from wall, ceiling, fence or other obstacles.

• Do not place any obstacles which may cause a short circuit of the discharged air.

• If piping length is over 7.5m, additional refrigerant should be added as shown in the table.

• This illustration is for explanation purposes only. The indoor unit will actually face a different way.

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10.2. Indoor Unit

10.2.1. SELECT THE BEST LOCATION (Refer to “Select the best location” section)

10.2.2. HOW TO FIX INSTALLATION PLATE

The mounting wall is strong and solid enough to prevent it from the vibration.

10.2.3. TO DRILL A HOLE IN THE WALL AND INSTALL A SLEEVE OF PIPING

1. Insert the piping sleeve to the hole.

2. Fix the bushing to the sleeve.

3. Cut the sleeve until it extrudes about 15 mm from the wall.

Caution

When the wall is hollow, please be sure to use the sleeve for tube ass’y to prevent dangers caused by mice biting the connecting cable.

4. Finish by sealing the sleeve with putty or caulking

compound at the final stage.

The centre of installation plate should be at more than 550 mm at right and left of the wall.

The distance from installation plate edge to ceiling should more than 67 mm.

From installation plate left edge to unit’s left side is 47 mm.

From installation plate right edge to unit’s right is 73 mm.

For left side piping, piping connection for liquid should be about 126 mm from this line.

For left side piping, piping connection for gas should be about 174 mm from this line.

For left side piping, piping connection cable should be about 984 mm from this line.

1. Mount the installation plate on the wall with 5 screws or more. (If mounting the unit on the concrete wall, consider using anchor bolts.)

• Always mount the installation plate horizontally by

aligning the marking-off line with the thread and using a level gauge.

2. Drill the piping plate hole with ø70 mm hole-core drill.

• Line according to the arrows marked on the lower left

and right side of the installation plate. The meeting point of the extended line is the centre of the hole. Another method is by putting measuring tape at position as shown in the diagram above. The hole centre is obtained by measuring the distance namely 150 mm and 125 mm for left and right hole respectively.

• Drill the piping hole at either the right or the left and the

hole should be slightly slanted to the outdoor side.

10.2.4. INDOOR UNIT INSTALLATION

1. For the right rear piping

2. For the right and right bottom piping

3. For the embedded piping

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10.2.5. CONNECT THE CABLE TO THE INDOOR UNIT

1. The inside and outside connecting cable can be connected without removing the front grille.

2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3 × 2.5 mm (C24DK) or 5 × 2.5 mm2(A18DK, A24DK) flexible cord, type designation 245 IEC 57 or heavier cord.

• Ensure the colour of wires of outdoor unit and the

terminal Nos. are the same to the indoor’s respectively.

• Earth lead wire shall be longer than the other lead wires

as shown in the figure for the electrical safety in case of the slipping out of the cord from the anchorage.

• Secure the cable onto the control board with the holder

(clamper).

INSTALLATION OF SUPER ALLERU-BUSTER FILTER

1. Open the front panel.

2. Remove the air filter.

3. Remove Supersonic air purifying device.

4. Open the Supersonic air purifying device frame.

5. Insert the super alleru-buster filter and close the Supersonic air purifying device frame as shown in illustration at right.

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HOW TO TAKE OUT FRONT GRILLE

Please follow the steps below to take out front grille if necessary such as when servicing.

1. Open the intake grille.

2. Set the vertical airflow direction louver to the horizontal position.

3. Slide down the 3 caps on the front grille as shown in the illustration below, and then remove the 3 mounting screws.

4. Pull the lower section of the front grille towards you to remove the front grille.

When reinstalling the front grille, first set the vertical airflow direction louvers to the horizontal position and then carry out above steps 2 - 3 in the reverse order.

AUTO SWITCH OPERATION

The below operations will be performed by pressing the “AUTO” switch.

1. AUTO OPERATION MODE

The Auto operation will be activated immediately once the Auto Switch is pressed.

2. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)

The Test Run operation will be activated if the Auto Switch is pressed continuously for more than 5 sec. A “beep” sound will occur at the fifth sec., in order to identify the starting of Test Run operation.

3. REMOTE CONTROLLER RECEIVING SOUND ON/OFF

The ON/OFF of remote controller receiving sound can be changed over by the following step:

a. Release the Auto Switch after Test Run operation is

activated.

b. Then, within 20 sec after (a), press Auto Switch for more

than 5 sec.

A “beep” “beep” sound will occur at the fifth sec., then release the Auto switch.

c. Within 20 sec after (b), press Auto Switch again.

Everytime Auto Switch is pressed (within 20 sec interval), remote controller receiving sound status will be reversed between ON and OFF.

Long “beep” sound indicates that remote controller receiving sound is OFF.

Short “beep” sound indicates that remote controller receiving sound is ON.

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10.3. Outdoor Unit

10.3.1. SELECT THE BEST LOCATION (Refer to “Select the best location” section)

10.3.2. INSTALL THE OUTDOOR UNIT

• After selecting the best location, start installation according

to Indoor/Outdoor Unit Installation Diagram.

1. Fix the unit on concrete or rigid frame firmly and horizontally

by bolt nut. (ø10 mm).

2. When installing at roof, please consider strong wind and

earthquake. Please fasten the installation stand firmly with bolt or nails.

10.3.3. CONNECTING THE PIPING

Connecting The Piping To Indoor Unit

Please make flare after inserting flare nut (locate at joint portion of tube assembly) onto the copper pipe. (in case of using long piping)

Connect the piping

• Align the center of piping and sufficiently tighten the flare

nut with fingers.

• Further tighten the flare nut with torque wrench in specified

torque as stated in the table.

Connecting The Piping To Outdoor Unit

Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (located at valve) onto the copper pipe.

Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table.

CUTTING AND FLARING THE PIPING

1. Please cut using pipe cutter and then remove the burrs.

2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3. Please make flare after inserting the flare nut onto the copper pipes.

MODEL Piping size (Torque)

Gas Liquid

A18DK 1/2” (55 N.m) 1/4” (18 N.m)

C24DK, A24DK 5/8” (65 N.m) 1/4” (18 N.m)

10.3.4. EVACUATION OF THE EQUIPMENT

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1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way valve.

• Be sure to connect the end of the charging hose with

the push pin to the service port.

2. Connect the center hose of the charging set to a vacuum pump with check valve, or vacuum pump and vacuum pump adaptor.

3. Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from 0 cmHg (0 Mpa) to -76 cmHg (-0.1 Mpa). Then evacuate the air approximately ten minutes.

4. Close the Low side valve of the charging set and turn off

Note : BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.

5. Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.

6. Tighten the service port caps of the 3-way valve at a torque of 18 N.m with a torque wrench.

7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN” using a hexagonal wrench (4 mm).

8. Mount valve caps onto the 2-way valve and the 3-way valve.

• Be sure to check for gas leakage.

the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes.

CAUTION

• If gauge needle does not move from 0 cmHg (0 Mpa) to -76 cmHg (-0.1 Mpa), in step

• If the leak stops when the piping connections are tightened further , continu e working from step

• If the leak does not stop when the connections are retightened, repair the location of leak.

• Do not release refrigerant during piping work for installation and reinstallation. Take care of the liquid refrigerant , it may cause frostbite.

above take the following measure.-

10.3.5. CONNECT THE CABLE TO THE OUTDOOR UNIT

1. Remove the control board cover from the unit by loosening the screw.

2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3 × 2.5 mm 5 × 2.5 mm

( A18CK, A24DK) flexible cord, type designation 245 IEC 57 or heavier cord.

(C24DK) or

3. Secure the cable onto the control board with the holder (clamper).

4. Attach the control board cover to the original position with the screw.

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10.3.6. PIPE INSULATION

1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap the insulated piping end to prevent water from going inside the piping.

2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E FOAM with thickness 6 mm or above.

DISPOSAL OF OUTDOOR UNIT DRAIN WATER

• If a drain elbow is used, the unit should be placed on a stand which is taller than 3 cm.

• If the unit is used in an area where temperature falls below 0°C for 2 or 3 days in succession, it is recommended not to use a drain elbow, for the drain water freezes and the fan will not rotate.

CHECK THE DRAINAGE

• Open front panel and remove air filters. (Drainage checking can be carried out without removing the front grille.)

• Pour a glass of water into the drain tray-styrofoam.

• Ensure that water flows out from drain hose of the indoor

unit.

EVALUATION OF THE PERFORMANCE

• Operate the unit at cooling operation mode for fifteen minutes or more.

• Measure the temperature of the intake and discharge air.

• Ensure the difference between the intake temperature and

the discharge is more than 8°C.

NOTE: These equipment shall be connected to a suitable mains network

with a main impedance less than the following:

CS/CU-C24DKD:0.13 Ω CS/CU-A24DKD:0.06 Ω

CHECK ITEMS

Is there any gas leakage at flare nut connections? Has the heat insulation been carried out at flare nut

connection? Is the connecting cable being fixed to terminal board firmly? Is the connecting cable being clamped firmly? Is the drainage OK?

(Refer to “Check the drainage” section) Is the earth wire conne ction properly done? Is the indoor unit properly hooked to the installation plate? Is the power supply voltage complied with rated value? Is there any abnormal sound? Is the cooling operation normal? Is the thermostat operation normal? Is the remote control’s LCD operation normal? Is the super alleru-buster filter is installed?

11 2-way, 3-way Valve

2-way Valve (Liquid Side) 3-way Valve (Gas Side)

Works Shaft Position Shaft Position Service Port

Shipping Close Close Close

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

(With valve cap) (With valve cap) (With cap)

Evacuation Close Close Open

(Installation and (Counter-Clockwise) (Clockwise) (Push-pin)

Re-installation)

Operation Open Open Close

(With valve cap) (With valve cap) (With cap)

Pumping down Close Open Open

(Transferring) (Clockwise) (Counter-Clockwise) (Connected manifold

Evacuation Open Open Open

(Servicing) With vacuum pump

Gas charging Open Open Open

(Servicing) (With charging cylinder)

Pressure check Open

(Servicing) Open Open (Connected manifold

Gas releasing Open

(Servicing) Open Open (Connected manifold

gauge)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.1. Evacuation of the Equipment (For Europe & Oceania Destination)

11.1.1. Evacuation of Installation

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

If air remain in the indoor unit and refrigeration pipes, it will affect the compressor, reduce to cooling capacity, and could lead to a malfunction.

Procedure:

1. Connect a charging hose with a push pin to the Low

side of a charging set and the service port of a 3-way valve.

• Be sure to connect the end of the charging hose with the push pin to the service port.

2. Connect the centre hose of the charging set to a

vacuum pump.

3. Turn on the power switch of the vacuum pump and

make sure that the needle in the gauge moves from 0 MPa (0 cmHg) to -0.1 MPa (-76 cmHg). Then evacuate the air for approximately ten minutes.

4. Close the Low side valve of the charging set and turn

off the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes.

BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID GAS LEAKAGE.

5. Disconnect the charging hose from the vacuum pump

and from the service port of the 3-way valve.

6. Tighten the service port cap at a torque of 18 N.m with

a torque wrench.

7. Remove the valve caps of the 2-way valve and the 3-

way valve. Position both of the valves to “open” using a hexagonal wrench (4 mm).

8. Mount the valve caps onto the 2-way and 3-way valves.

• Be sure to check for gas leakage.

Caution

If gauge needle does not move from 0 cmHg to -76 cmHg in step (3) above, take the following measures:

If the leaks stop when the piping connections are tightened further, continue working from step (3).

If the leaks do not stop when the connections are retightened, repair the location of the leak.

11.1.2. Pumping down

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to

the opened position.

• Remove the valve stem caps and confirm that the valve stems are in the opened position.

• Be sure to use a hexagonal wrench to operate the valve stems.

2. Operate the unit for 10 to 15 minutes.

3. Stop operation and wait for 3 minutes, then connect the

charge set to the service port of the 3-way valve.

• Connect the charge hose with the push pin to the Gas service port.

4. Air purging of the charge hose.

• Open the low-pressure valve on the charge set slightly to purge air from the charge hose.

5. Set the 2-way valve to the closed position.

6. Operate the air conditioner at the cooling cycle and

stop it when the gauge indicates 0 MPa (0 kg/cm

G).

If the unit cannot be operated at the cooling condition (weather is rather cool), short the Pumping Down pins on the Main Control P.C.B.

(Simply press the pumping down button if it is equipped.)

So that the unit can be operated.

7. Immediately set the 3-way valve to the closed position.

• Do this quickly so that the gauge ends up indicating 0.1 MPa (1 kg/cm

G) to 0.3 MPa (3 kg/cm2G).

8. Use refrigerant reclaiming equipment to collect

refrigerant from indoor unit and pipes.

9. Disconnect the charge set, and mount the 2-way and 3-

way valve’s stem caps and the service port caps.

• Use a torque wrench to tighten the service port cap to a torque of 18 N.m.

• Be sure to check for gas leakage.

10. Disconnect pipes from indoor unit and outdoor unit.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.1.3. Evacuation of Re-installation

WHEN REINSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

If air remain in the indoor unit and refrigeration pipes, it will affect the compressor, reduce to cooling capacity, and could lead to a malfunction.

Procedure:

1. Connect a charging hose with a push pin to the Low

side of a charging set and the service port of the 3-way valve.

• Be sure to connect the end of the charging hose with the push pin to the service port.

2. Connect the centre hose of the charging set to a

vacuum pump.

3. Turn on the power switch of the vacuum pump and

make sure that the needle in the gauge moves from 0 MPa (0 cmHg) to -0.1 MPa (-76 cmHg). Then evacuate the air for approximately ten minutes.

4. Close the Low side valve of the charging set and turn

off the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes.

BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID GAS LEAKAGE.

5. Disconnect the charging hose from the vacuum pump.

6. Charge the pipes and indoor unit with gas refrigerant

from 3-way valve service port, and then discharge the refrigerant until low side (gas side) gauge needle indicates 0.3 MPa (3 kg/cm

7. Tighten the service port cap at a torque of 18 N.m with

a torque wrench.

8. Remove the valve caps of the 2-way valve and the 3-

way valve. Position both of the valves to “open” using a hexagonal wrench (4 mm).

9. Mount the valve caps onto the 2-way and 3-way valves.

• BE SURE TO USE REFRIGERANT RECLAIMING EQUIPMENT WHILE DISCHARGING THE REFRIGERANT.

• Purge the air from charge set’s centre hose.

• Be sure to check for gas leakage.

Caution

If gauge needle does not move from 0 MPA (0 cmHg) to -0.1 MPa (-76 cmHg) in step (3) above, take the following measures:

If the leaks stop when the piping connections are tightened further, continue working from step 3.

If the leaks do not stop when the connections are retightened, repair the location of the leak.

11.1.4. Balance refrigerant of the 2-way, 3-way valves

(Lack of refrigerant in the refrigeration cycle)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to

the open position.

2. Connect the charge set to the 3-way valve’s service

port.

• Leave the valve on the charge set closed.

• Connect the charge hose with the push-pin to the

service port.

3. Connect the charge set’s centre hose to refrigerant

reclaiming equipment.

• Purge the air from charge hose.

4. Open the valve (Low side) on the charge set and

discharge the refrigerant until the gauge indicates 0.05 MPa (0.5 kg/cm

G) to 0.1 MPa (1 kg/cm2G).

• If there is no air in the refrigeration cycle (the pressure when the air conditioner is not running is higher than 0.1 MPa (1 kg/cm gauge indicates 0.05 MPa (0.5 km/cm

kg/cm

G). If this is the case, it will not be necessary to

G), discharge the refrigerant until the

G) to 0.1 MPa (1

apply a evacuation.

• Discharge the refrigerant gradually; if it is discharged too suddenly, the refrigeration oil will also be discharged.

5. Turn on refrigerant reclaiming equipment.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.1.5. Evacuation

(No refrigerant in the refrigeration cycle)

Procedure:

1. Connect the vacuum pump to the charge set’s centre

hose.

2. Evacuation for approximately one hour.

• Confirm that the gauge needle has moved toward -0.1 MPa (-76 cmHg) [vacuum of 4 mmHg or less.]

3. Close the valve (Low side) on the charge set, turn off

the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

4. Disconnect the charge hose from the vacuum pump.

• Vacuum pump oil

If the vacuum pump oil becomes dirty or depleted, replenish as needed.

11.1.6. Gas charging

(After Evacuation)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Connect the charge hose to the charging cylinder.

• Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.

2. Purge the air from the charge hose.

• Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).

3. Open the valve (Low side) on the charge set and charge

the system with liquid refrigerant.

• If the system cannot be charged with the specified amount of refrigerant, it can be charged with a little at a time (approximately 150 g each time) while operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure. (pumping down-pin)

This is different from previous proced ures. Because you are charging with liquid refrigerant from the gas side, absolutely do no attempt to charge with large amount of liquid refrigerant while operating the air conditioner.

4. Immediately disconnect the charge hose from the 3-

way valve’s service port.

• Stopping partway will allow the refrigerant to be discharged.

• If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose.

5. Mount the valve stem caps and the service port cap.

• Use torque wrench to tighten the service port cap to a torque of 18 N.m.

• Be sure to check for gas leakage.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.2. Air Purging of the Piping and Indoor Unit

11.2.1. Air purging (Installation)

Required tools: hexagonal wrench, adjustable wrench, torque wrenches, wrench to hold the joints and gas leak detector. The additional gas for air purging has been charged in the outdoor unit. However, if the flare connections have not been done correctly and there gas leaks, a gas cylinder and the charge set will be needed.

The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration pipings, it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction.

Service port cap Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gas leakage from the refrigeration cycle.

Procedure:

1. Recheck the piping connections.

2. Open the valve stem of the 2-way valve counter-

clockwise approximately 90°, wait 10 seconds, and then set it to closed position.

• Be sure to use a hexagonal wrench to operate the valve stem.

3. Check for gas leakage.

6. Set the 3-way valve to the opened position.

7. Mount the valve stem nuts to the 2-way and 3-way

valves.

8. Check for gas leakage.

• At this time, especially check for gas leakage from the 2way and 3-way’s stem nuts, and from the service port cap.

• Check the flare connection for gas leakage.

4. Purge the air from the system

• Set the 2-way valve to the open position and remove the cap from the 3-way valve’s service port.

• Using the hexagonal wrench to press the valve core pin, discharge for three seconds and then wait for one minute. Repeat this three times.

5. Use torque wrench to tighten the service port cap to a

Caution

If gas leakage is discovered in step (3) above, take the following measures:

If the leaks stop when the piping connections are tightened further, continue working from step (4).

If the gas leaks do not stop when the connections are retightened, repair the location of the leak, discharge all of the gas through the service port, and then recharge with the specified amount of gas from a gas cylinder.

torque of 1.8 kg.m. (18 N.m).

11.2.2. Pumping down (Re-installation)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to

the opened position.

• Remove the valve stem caps and confirm that the valve stems are in the opened position.

• Be sure to use a hexagonal wrench to operate the valve stems.

2. Operate the unit for 10 to 15 minutes.

3. Stop operation and wait for 3 minutes, then connect the

charge set to the service port of the 3-way valve.

• Connect the charge hose with the push pin to the Gas service port.

4. Air purging of the charge hose.

• Open the low-pressure valve on the charge set slightly to purge air from the charge hose.

5. Set the 2-way valve to the close position.

6. Operate the air conditioner at the cooling cycle and

stop it when the gauge indicates 1 kg/cm

G (0.1 MPa).

7. Immediately set the 3-way valve to the closed position.

• Do this quickly so that the gauge ends up indicating 3 to 5 kg/cm

G (0.3 to 0.5 MPa).

8. Disconnect the charge set, and mount the 2-way and 3-

way valve’s stem nuts and the service port caps.

• Use a torque wrench to tighten the service port cap to a torque of 1.8 kg.m (18 N.m).

• Be sure to check for gas leakage.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.2.3. Re-air purging (Re-installation)

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to

the closed position.

2. Connect the charge set and a charging cylinder to the

service port of the 3-way valve.

• Leave the valve on the charging cylinder closed.

3. Air purging.

• Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45° for 3 seconds then closing it for 1 minute; repeat 3 times.

• After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4. Check for gas leakage.

• Check the flare connections for gas leakage.

5. Discharge the refrigerant.

• Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicates 3 to 5 kg/cm

(0.3 to 0.5 MPa)

6. Disconnect the charge set and the charging cylinder,

and set the 2-way and 3-way valves to the open position.

• Be sure to use a hexagonal wrench to operate the valve stems.

7. Mount the valve stem nuts and the service port cap.

• Be sure to use a torque wrench to tighten the service port cap to a torque 1.8 kg.m (18 N.m).

• Be sure to check for gas leakage.

11.2.4. Balance refrigerant of the 2-way, 3-way valves

(Gas leakage)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to

the open position.

2. Connect the charge set to the 3-way valve’s service

port.

• Leave the valve on the charge set closed.

• Connect the charge hose with the push pin to the

service port.

3. Open the valves (Low side) on the charge set and

discharge the refrigerant until the gauge indicates 0.5 to 1 kg/cm

G (0.05 to 0.1 MPa) .

• If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is higher than 1

kg/cm

G (0.1 MPa)], discharge the refrigerant until the

gauge indicates 0.5 to 1 kg/cm

G (0.05 to 0.1 MPa). If this is the case, it will not be necessary to apply a evacuation.

• Discharge the refrigerant gradually; if it is discharged too suddenly, the refrigeration oil will be discharged.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

11.2.5. Evacuation (Installation)

(No refrigerant in the refrigeration cycle)

Procedure:

1. Connect the vacuum pump to the charge set’s centre

hose.

2. Evacuation for approximately one hour.

• Confirm that the gauge needle has moved toward -0.1 MPa (-76 cmHg) [vacuum of 4 mmHg or less.]

3. Close the valve (Low side) on the charge set, turn off

the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

4. Disconnect the charge hose from the vacuum pump.

• Vacuum pump oil

If the vacuum pump oil becomes dirty or depleted, replenish as needed.

11.2.6. Gas charging

(After Evacuation)

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Procedure:

1. Connect the charge hose to the charging cylinder.

• Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.

2. Purge the air from the charge hose.

• Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).

3. Open the valve (Low side) on the charge set and charge

the system with liquid refrigerant.

4. Immediately disconnect the charge hose from the 3-

way valve’s service port.

• Stopping partway will allow the refrigerant to be discharged.

• If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose.

5. Mount the valve stem caps and the service port cap.

• Use torque wrench to tighten the service port cap to a torque of 18 N.m.

• Be sure to check for gas leakage.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

12 Servicing Information

Caution:

• Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

• Pb free solder will tend to splash when heated too high (about 1100° F/600°C).

12.1. Indoor Electronic Controllers Removal Procedures

1. The Electronic Controller, a Signal Receiver and an Indicator (Fig. 3) can be seen by the below steps:

• Remove the 3 caps and 3 screws at the bottom of the

Front Grille. (Fig. 1)

• Remove the Front Grille by releasing the 3 hooks at the

top of the Front Grille. (Fig. 1)

Fig. 1

• Unhook the tabs at the Control Board to remove the

Control Board Cover. (Fig. 2)

2. To remove the Electronic Controllers:

• Release the 2 Particular Piece. (Fig. 3)

• Release the earth wire screw. (Fig. 3)

• Release the screw holder terminal board. (Fig. 3)

• Release the CN-DISP connector. (Fig. 3)

• Release the CN-TH connector. (Fig. 4)

• Release the CN-ION connector. (Fig. 4)

• Release the CN-SONIC connector. (Fig. 4)

• Release the CN-STM1 connector. (Fig. 4)

• Release the CN-STM2 connector. (Fig. 4)

• Release the hooks that hold the Electronic Controller

and pull out the Electronic Controller. (Fig. 4)

• Release the CN-FM connector. (Fig. 4)

• Release the AC01 (white) connector. (Fig. 4)

• Release the two RY-PWR connector. (Fig. 4)

Fig. 2

Fig. 3

Fig. 4

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

12.2. Cross Flow Fan and Indoor Fan Motor Removal Procedures

1. In order to remove the Cross Flow Fan and Indoor Fan Motor, Control Board need to be taken out by releasing all the connectors as indicated below.

a. Release the Earth Wire screw. (Fig. 5)

b. Release the CN-TH connector. (Fig. 5)

c. Release the CN-ION connector. (Fig. 5)

d. Release the CN-SONIC connector. (Fig. 5)

e. Release the CN-STM1 connector. (Fig. 5)

f. Release the CN-STM2 connector. (Fig. 5)

g. Release the CN-DISP connector. (Fig. 5)

h. Pull out the Drain Hose from outlet to remove the

Discharge Grille. (Fig. 5)

2. Release the ION connectors. (Fig. 6)

Fig. 5

3. Release the 3 screws. (Fig. 6)

4. By pressing down the hook at the left, you will be able to remove the Control Board. (Fig. 6)

5. Remove the screw at the Cross Flow Fan. (Fig. 7)

Fig. 6

6. Remove the Bearing. (Fig. 8)

7. Remove the screws at the left of the Evaporator. (Fig. 8)

Fig. 7

Fig. 8

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

8. Push up the Evaporator and pull out the Cross Flow Fan from shaft. By then, Fan Motor can be taken out. (Fig. 9)

REMINDER - To reinstall the Fan Motor, put it back in place, adjust the position of the Fan Motor’s leadwire appropriately as shown in the Fig. 7--- before installing the Cross Flow Fan.

12.3. Remote Control Reset

Fig. 9

When the batteries are inserted for the first time or the batteries are replaced, all the indications will blink and the remote control might not work.

If this happen, remove the cover of the remote control and you will find a resetting terminal, and by shorting it with a minus screwdriver, it will return to normal.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

12.4. Auto OFF/ON Button

• The “Auto OFF/ON Button” (behind the front grille) is used to operate the air conditioner if remote control is misplaced or malfunctioning.

• Forced cooling operation is possible by pressing the “Auto OFF/ON Button” for more than 5s where “beep” sound is heard then release the button.

• User able to select remote control transmission code and toggle remote control signal receiving sound under various setting mode.

• To enter various setting mode:

− Press the “Auto OFF/ON Button” continuosly for 5s (beep sound is heard) and release.

− Within 20s, press the “Auto OFF/ON Button” continuously for 5s again (2 beep sound is heard) and release.

− Various setting mode has limit up to 20s. Then return to normal operation.

12.4.1. Toggle Remote Control Signal Receiving Sound

• Under various setting mode, press the “Auto OFF/ON Button” to toggle the remote control sound.

− Short “beep” : Turn ON remote control signal receiving sound.

− Long “beep” : Turn OFF remote control signal receiving sound.

• After “Auto OFF/ON Button” is pressed, the 20s counter for various setting mode is restarted.

12.4.2. Select Remote Control Transmission Code

• There are 4 type of remote control transmission code could be selected and stored in EEPROM of indoor unit. The indoor unit will only operate when received signal with same transmission code from remote control. This could prevent signal inteference when there are 2 or more indoor unit installed nearby together.

• To change remote control transmission code, short or open jumpers at the remote control printed circuit board.

Remote Control Printed Circuit Board Transmission Code Combination

J-A J-B Remote Control No.

* Short

Open Short Open

Open Open Short Short

A (default)

B C D

• Under various setting mode, after select the transmission code combination of remote control, press any button of remote control to transmit a signal to indoor unit. The transmission code will be stored in EEPROM.

• After signal is received, the various setting mode is cancelled and return to normal operation.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

13 Troubleshooting Guide

13.1. Refrigeration cycle system

In order to diagnose malfunctions, make sure that there are no electrical problems before inspecting the refrigeration cycle. Such problems include insufficient insulation, problem with the power source, malfunction of a compressor and a fan.

The normal outlet air temperature and pressure of the refrigeration cycle depends on various conditions, the standard values for them are shown in the table on the right.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

13.1.1. Relationship between the condition of the air conditioner and pressure and

electric current

Cooling Mode Heating Mode

Condition of the air

conditioner Low Pressure High Pressure Electric current

during operat ion

Insufficient refrigerant

(gas leakage)

Low Pressure High Pressure Electric current

during operat ion

Clogged capillary tube or

Short circuit in the indoor

Heat radiation deficie ncy

Strainer

unit

of the outdoor unit

Inefficient compression

• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

13.1.2. Diagnosis methods of a malfunction of a compressor and 4-way valve

Nature of fault Symptom

• Electric current during operation becomes approximately 20% lower than the normal value.

Insufficient compressing of a compressor

Locked compressor

Insufficient switches of the 4-way valve

• The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).

• The difference between high pressure and low pressure becomes almost zero.

• Electric current reaches a high level abnormally, and the value exceeds the limit of an

ammeter. In some cases, a breaker turns off.

• The compressor has a humming sound.

• Electric current during operation becomes approximately 80% lower than the normal value.

• The temperature different between from the discharge tube to the 4-way valve and from

suction tube to the 4-way valve becomes almost zero.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

14 Technical Data

14.1. Thermostat characteristics

14.2. Operation characteristics

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

15 Exploded View (Indoor Unit)

15.1. CS-A18DKD CS-A24DKD

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Note:

The above exploded view is for the purpose of parts disassembly and replacement.

The non-numbered parts are not kept as standard service parts.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

16 Replacement Parts List (Indoor Unit)

16.1. CS-A18DKD CS-A24DKD

REF. NO. PART NAME & DESCRIPTION QTY. CS-A18DKD CS-A24DKD REMARKS

1 CHASSY COMPLETE 1 CWD50C1382

2 FAN MOTOR 1 CWA981149

3 CROSS FLOW FAN COMPLETE 1 CWH02C1010

4 SCREW - CROSS FLOW FAN 1 CWH4580304

5 BEARING ASS’Y 1 CWH64K007

6 EVAPORATOR 1 CWB30C1549 CWB30C1572

7 FLARE NUT (1/4”) 1 CWH6002140

8 FLARE NUT (1/2”) (5/8”) 1 CWT25007 CWT25004

9 HOLDER SENSOR 1 CWH32143

10 DISCHARGE GRILLE COMPLETE 1 CWE20C2345

11 VERTICAL VANE 15 CWE241088

12 CONNECTING BAR 1 CWE261025

13 AIR SWING MOTOR 1 CWA98260

14 AIR SWING MOTOR 1 CWA98K1008

15 LEAD WIRE - AIR SWING MOTOR 2 CWA67C3731

16 HORIZONTAL VANE 1 CWE241152A

17 HORIZONTAL VANE 1 CWE241153A

18 CAP - DRAIN TRAY 1 CWH52C1001

19 BACK COVER CHASSIS 1 CWD932162B

20 CONTROL BOARD CASING 1 CWH102250

21 TERMINAL BOARD COMPLETE 1 CWA28C2095 CWA28C2096 0

22 POWER SUPPLY CORD 1 CWA20C2163 CWA20C2164

23 ELECTRONIC CONTROLLER - MAIN 1 CWA743487 CWA743670 0

24 INDICATOR COMPLETE 1 CWE39C1116

25 INDICATOR HOLDER 1 CWD932435

26 INDICATOR HOLDER 1 CWD932436

27 SENSOR COMPLETE 1 CWA50C2122

28 CONTROL BOARD TOP COVER 1 CWH131210

29 CONTROL BOARD FRONT COVER 1 CWH131209

30 REMOTE CONTROL COMPLETE 1 CWA75C2624

31 FRONT GRILLE COMPLETE 1 CWE11C3126 CWE11C3127 0

32 INTAKE GRILLE COMPLETE 1 CWE22C1159

33 GRILLE DOOR 1 CWE141076

34 AIR FILTER (L) 1 CWD001137

35 AIR FILTER (R) 1 CWD001138

36 SCREW - FRONT GRILLE 3 XTT4+16C

37 CAP - FRONT GRILLE 3 CWH521062A

38 DRAIN HOSE 1 CWH851063

39 BAG COMPLETE - INSTALLATION SCREW 1 CWH82C067

40 INSTALLATION PLATE 1 CWH36K1007

41 FULCRUM 2 CWH621047

42 ELECTRONIC CONTROLLER - IONIZER 1 CWA743675

43 CASING - IONIZER 1 CWD932464

44 CASING - IONIZER 1 CWD932527

45 ION - GENERATOR 1 CWH94C0001

46 SUPERSONIC AIR PURIFYING DEVICE 1 CWH91C1013

47 ELEC. CONTROLLER - SUPERSONIC 1 CWA743874

48 SUPER ALLERU BUSTER FILTER 1 CWD00C1133

49 FRAME FR AIR FILTER SUPERSONIC 1 CWD011026

50 FRAME FR AIR FILTER SUPERSONIC 1 CWD011027

←

(Note)

• All parts are supplied from PHAAM, Malaysia (Vendor Code: 061).

• “O” marked parts are recommended to be kept in stock.

17 Exploded View (Outdoor Unit)

17.1. CU-A18DKD CU-A24DKD

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

Note:

The above exploded view is for the purpose of parts disassembly and replacement.

The non-numbered parts are not kept as standard service parts.

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

18 Replacement Parts List (Outdoor Unit)

18.1. CU-A18DKD CU-A24DKD

REF. NO. PART NAME & DESCRIPTION QTY. CU-A18DKD CU-A24DKD REMARKS

1 CHASSY ASS’Y 1 CWD50K2087

2 COMPRESSOR 1 2JS324D3AB07 2JS438D3JA02 0

3 ANTI - VIBRATION BUSHING 3 CWH50055

4 NUT - COMPRESSOR MOUNT 3 CWH4582065

5 PACKING 3 CWB81043

6 CONDENSER 1 CWB32C1349 CWB32C1350

7 SOUND PROOF BOARD ASS’Y 1 CWH151051

8 FAN MOTOR BRACKET 1 CWD541055

9 SCREW - FAN MOTOR BRACKET 2 CWH551060

10 FAN MOTOR 1 CWA951385

11 SCREW - FAN MOTOR MOUNT 3 CWH55252

12 PROPELLER FAN ASS’Y 1 CWH03K1017

13 NUT - PROPELLER FAN 1 CWH561038

14 HOLDER COUPLING 1 CWH351036

15 2-WAY VALVE (LIQUID) 1 CWB021173

16 TUBE ASS’Y (CAPILLARY TUBE) 1 CWT01C3391 CWT01C3390

17 3-WAY VALVE (GAS) 1 CWB011212 CWB011213 0

18 TERMINAL COVER 1 CWH171012

19 NUT - TERMINAL COVER 1 CWH7080300

20 CONTROL BOARD CASING 1 CWH102206

21 CAPACITOR-F.M 1 DS441355NPQA

22 CAPACITOR - COMP 1 CWA312079

23 HOLDER CAPACITOR 1 CWH30060

24 TERMINAL BOARD ASS’Y 1 CWA28K1070

25 CABINET SIDE PLATE (L) 1 CWE041082A

26 HANDLE 1 CWE161010

27 CABINET SIDE PLATE (R) 1 CWE041083A

28 HANDLE 2 CWE16000E

29 CABINET FRONT PLATE ASS’Y 1 CWE06K1043

30 WIRE NET COMPLETE 1 CWD041041A

31 CABINET TOP PLATE ASS’Y 1 CWE03K1009A

32 CONTROL BOARD COVER 1 CWH131168

33 CONTROL BOARD COVER COMPLETE 1 CWH131169A

34 OPERATION INSTRUCTIONS 1 CWF564548

35 INSTALLATION INSTRUCTIONS 1 CWF612685

36 SENSOR COMPLETE 1 CWA50C618

38 SOUND PROOF MATERIAL 1 CWG30221

39 ELECTRONIC CONTROLLER 1 CWA743367

40 4-WAY VALVE ASS’Y 1 CWB00K1025 CWB00K1026 0

41 V-COIL COMPLETE 1 CWA43C2121

43 HOLDER SENSOR 1 CWH32089

44 HOLDER SENSOR 1 CWH32074

45 INSTALLATION INSTRUCTIONS 1 CWF612686

46 INSTALLATION INSTRUCTIONS 1 CWF612718

←

(Note)

• All parts are supplied from PHAAM, Malaysia (Vendor Code: 061).

• “O” marked parts are recommended to be kept in stock.

19 Electronic Circuit Diagram

19.1. Indoor Unit & Outdoor Unit

CS-A18DKD CU-A18DKD CS-A24DKD CU-A24DKD

SCHEMATIC DIAGRAM 1/4

ELECTRONIC CONTROL UNIT

Q06

SUPERSONIC COMPLETE

0.1

IC1

5.1k

CN-SONIC

CN1

1 2

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

BZ BZ01

R40 10k

R55 1k

R28

Q01

DISPLAY COMPLETE

IC101

R101

C101 47

6.3V

TIMER (ORG) POWER (GRN)

POWERFUL (ORG) QUIET (ORG)

IONIZER (GRN)

D101

D105

D103

D102

SUPERSONIC (BLU)

D104

D106

9 8 7 6 5 4 3 2

CN-DISP

Auto SW

(XH4)

C33

C34

C35

R15R12R13

CN-DISP

1 2 3 4 5 6 7 8 9

C19

4 3 2 1

C32

0.1

R14

R16

R17

R39 1k

R58

C13

10k

0.01

C22

0.01

R59 1k

JP6

R68 10k

R34

C01

10k

0.01

R88 10k

D13

Q07

C49

R69 10k

Q08

R38

IC05

B1HBGGF00013

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

SCHEMATIC DIAGRAM 2/4

R46 10

R11

JP5

R90 10k

R35

C02

5.1k

0.01

R10 10k

D05

D06

D07

D08

D09

D10

D11

D12

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

P50/A8

P51/A9

P52/A10

P53/A11

P54/A12

P55/A13

P56/A14

P57/A15

Vss0

VDD0

P30

P31

P32

P33

P34

P35

P47/A07

P45/A05

P46/A06

RY-PWR DRIVE SIGNAL

DISPLAY

STEPPING MOTOR DRIVE SIGNAL

AUTO RESTART

P21/S0

P20/S1

P36

P44/A04

P22/SCX

P43/A03

P23

P41/A01

P42/A02

IC01

INTAKE AIR TEMP

P25

P24

P40/A00

STEPPING MOTOR DRIVE SIGNAL

BUZZER

PIPE TEMP

GROUND

VDD1

P66

P67

P17/AN7

Vss

26252423222120191817

P64

P65

TIMER SHORTEN

AUTO OPERATION TEST RUN REMOTE CONTROL SOUND

POWER CLOCK INPUT

REMOTE-CONTROL COMMAND INPUT

P15/AN5

P16/AN6

P75

RESET

POWER

P14/AN4

P74

OSC

P13/AN3

30292827

P73

P12/AN2

P72

P71

P70

P03/NTP3

P02/NTP2

P01/NTP1

P00/NTP0

Vss1

XT1

XT2

Reset

AVd0

AVref

P10/ANO

P11/AN1

JP2

R06 24k

R18

R19

R20

R21

R22

R23

R24

R25

Q02

R64

6.2k

R44 1k

C30

0.1

R91 1k

R63

6.2k

C36

C37

R45

C03

0.01

1.6V

C28

0.01

CN-STM1

R04 R05

43 /2W 43 /2W

12345

1234

VERTICAL

(ZH5)

RY-PWR

RY-HOT

IC06

B1HBGGF00013

CN-STM2

HORIZONTAL

R09 10k

R57 20k

JX2

12345

1234

(ZH5)

GND

IC02

C3EBD0000021

Vcc

C05

0.1

R/B

C04

0.1

(PH)

CN-TH

PIPE TEMP. SENSOR

C08

AIR TEMP. SENSOR (15k 3950)(20k 3950)

R33

0.1

15k

R30 20k

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

SCHEMATIC DIAGRAM 3/4

IC08

T01

C24

0.01

D01

C25

0.01

R02

R03

20k

C23

0.1

100

PC03

R70 100k

R71 100k

R72

3.9k

D02

R73 330k

D03

R74 330k

C42

Z01

0.22

DB02

L01

REGULATOR

C45

0.22

C20 3300 35V

DB03

12V

R66 22k

C47

0.1 450V

TH02

TH01

IC09

REGULATOR

C14 410 25V

R67 22k

R99

R98

82k

1/4W

T 3.15A L 250V

R97 82k 1/4W

FUSE

R96 82k 1/4W

C26 100 16V

RY-PWR

AC01

BLK

BRW

WHT

R32 150k

4.096 MHz (47pF X 2)

R54 1k

TEST

R48

R07 20k

R01

100

10k

R42

20k

R47

C18

R08

0.022

5.1k

X01

R53

R52

1.82k

C09 10 50V

IC04

R49

JP3

100k

OGI

C21

C12

2.2

0.01

50V

C10

0.1

C31

0.01

R38

R37 10k

R62

R65

R79 160 1/4W

JP4

R36 10k

R43

C15

0.01 JX1

R31

R56

R61 10k

Q03

22k

Q05

PC06

DB01

R81

PC01

TLP620

PC05

R77

4.75k

R80

22k

1/4W

C16

0.01

R113

6.2k 1/4W

R111

6.2k 1/4W

R76 10k

R78

5.62k

C06 1000p

C17 470

6.3V

GND

DEICE (BLU)

HOT

(RED)

G01

CN-FM

4 3 2 1

1 2 3 4 5 6 7

BLU

RED

CN-ION

FAN MOTOR

R50

47k

R51 47k

R114

6.2k 1/4W

R112

Q04

6.2k 1/4W

ZD02

8.2V

ZD03

8.5V

C48

C11

0.01

0.01 25V

C46

ZD01

7.5V

50V

R29 1k

PC04

feedback

RY-HOT

C51

100p

R75

7.5k

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

POWER SUPPLY

TEMPERATURE

FUSE

BLU

TO OUTDOOR

SCHEMATIC DIAGRAM 4/4

YLW

BLU

BLK/BLU

GRY

RED

WHT

VLT

ELECTRONIC

CONTROLLER

TF 1

DB1

TF 2

DB2

COMP (VLT)

AC1 (WHT) HOT 1 (RED) HOT 2 (BLK)DEICE (GRY)

FUSE

C13

(T 2A L 250V)

ZNR4

ZNR2

FM2

(ORG)

RY-H/L

RY-OFF

FM1

(BRW)

RY-DEICE

CR1

ZNR3

COIL

(4-WAYS VALVE)

BLK/BLU

RY-HOT

1 2 3 4

CN-TH (WHT)

COMPRESSOR

SENSOR

(AIR TEMP.)

SENSOR

(PIPE TEMP.)

BLU

CAPACITOR

RED

HIGH VOLTAGE IONIZER

CH1

4 3

VIN

GND

ERR

EH-4P

C2 C1

RED

BLU

CAPACITOR

Z01

4.7k

10k

ORG

BRW or YLW

FAN MOTOR

R13

R14

R15

Z02

R102

CN2

R101

D101

D102

R10

C101

R12

-4.2kV

CN3 GND

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

How to use electronic circuit diagram

TIMER TABLE

Real Timer 1 hr. 1 min.

Time Delay Safety Control 2 min. 58 sec. 0 sec. Forced Operation 60 sec. 0 sec. Time Save Control 7 min. 42 sec. Anti-Freezing 4 min. 0 sec. Auto Mode Judgement 25 sec. 0 sec. Soft Dry OFF 6 min. 36 sec.

Deodorizing Control

Comp. Reverse Rotation Detection 5 min. 30 sec. Comp. ON 5 min. and above

Comp./ Fan Motor Delay Timer 1.6 sec. 0 sec. Powerful Mode Operation 15 min. 15 sec. Random Auto Restart Control 0 ~ 62 sec. 0 ~ 6.2 sec. 4 Way Valve 5 min. 30 sec. After Deice Ended 30 sec. 3 sec. Comp. OFF after deice Hotstart Delay Times 4 min. 0 sec. Hotstart Finish Times 2 min. 0 sec. Ion OFF Timer 30 min. 180 sec. Ion ON Timer 10 sec. 1 sec. Quiet operat ion timer 1 hr. 30 min. 9 sec.

Test Mode

Name Time (When test point Remarks

Short-circuited)

10 min. 10 sec.

1 min. 1 sec.

ON 10 min. 60 sec. Soft Dry: 10 min. operation Cooling 40 sec. 4 sec.

70 sec. 7 sec. 20 sec. 2 sec.

180 sec. 18 sec.

Soft Dry 40 sec. 4 sec.

360 sec. 36 sec.

2 min. 0 sec.

19.2. Remote Control

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

19.3. Print Pattern Indoor Unit Printed Circuit Board

TOP VIEW

BOTTOM VIEW

19.4. Print Pattern Indicator & Receiver Printed Circuit Board

TOP VIEW

BOTTOM VIEW

CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD

19.5. Print Pattern Outdoor Unit Printed Circuit Board

TOP VIEW

BOTTOM VIEW

[PHAAM] Printed in Malaysia

Panasonic CS-A18DKD, CS-A24DKD, CU-A18DKD, CU-A24DKD Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual