Panasonic CS-A7DKD, CS-A9DKD, CS-A12DKD, CU-A7DKD, CU-A9DKD Service Manual

...

Order No. MAC0501023C3

Air Conditioner

CS-A7DKD CU-A7DKD CS-A9DKD CU-A9DKD CS-A12DKD CU-A12DKD

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-A7DKD CU-A7DKD

3.2. CS-A9DKD CU-A9DKD

3.3. CS-A12DKD CU-A12DKD

4 Dimensions

4.1. Indoor Unit & Remote Control 12

4.2. Outdoor Unit

5 Refrigeration Cycle Diagram

6 Block Diagram

7 Wiring Diagram

8 Operation Details

8.1. Heating Operation

8.2. Cooling Operation

8.3. Soft Dry Operation

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

8.4. Automatic Operation 22

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

9 Operating Instructions

10 Installation Instructions

10.1. Safety Precautions

10.2. Attached accessories

10.3. Select the best location

10.4. Indoor/Outdoor Unit Installation Diagram

10.5. Indoor unit

10.6. Outdoor unit

11 2-way, 3-way Valve

11.1. Air Purging of the Piping and Indoor Unit

12 Servicing Information

12.1. Distinction Of Lead Free (PbF) Printed Circuit Board

12.2. Indoor Electronic Controllers Removal Procedures

12.3. Indoor Fan Motor And Cross Flow Fan Removal

13 Troubleshooting Guide

14 Technical Data

15 Exploded View (Indoor Unit)

16 Replacement Parts List (Indoor Unit)

17 Exploded View (Outdoor Unit)

18 Replacement Parts List (Outdoor Unit)

19 Electronic Circuit Diagram

Procedures

12.4. Auto OFF/ON Button

12.5. Remote Control Reset

13.1. Refrigeration Cycle System

13.2. Relationship Between The Condition Of The Air

Conditioner And Pressure And Electric Current

13.3. Diagnosis Methods Of A Malfunction Of A Compressor

And 4-way Valve

14.1. Thermostat Characteristics

14.2. Operation Characteristics

15.1. CS-A7DKD CS-A9DKD CS-A12DKD

17.1. CU-A7DKD CU-A9DKD

17.2. CU-A12DKD

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

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 vertical airflow.

• Long installation piping.

− CS/CU-A7DK, CS/CU-A9DK, long piping up to 10

meter.

− CS/CU-A12DK, long piping up to 15 meter.

• Supersonic Air Purifying Device with SUPER alleru-

buster.

− Inactive various harmful airborne elements including

allergen, viruses and bacteria.

− Generated supersonic waves enhance the ability to

collect dust and dirt in the air.

• Quality Improvement

− Random auto restart after power failure for safety restart

operation.

− Gas leakage protection.

− Prevent Compressor reverse cycle.

− Inner protector to protect Compressor.

− Noise prevention during soft dry operation.

− Blue Coated Condenser for high resistance to corrosion.

• 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.

• Serviceability Improvement

− Removable and washable Front Panel.

2 Functions

2.1. Remote Control

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

2.2. Indoor Unit

AUTO

OFF / ON

Automatic Operation Button

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

• Press for ≥ 5 second to operate Cooling

operation mode and compressor force to on (“beep” sound will 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,

blinks in Automatic Operation judging and Hot Start operation.

•

TIMER

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

Setting.

•

QUIET

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

Operation.

•

POWERFUL

•

ION

•

SUPER ALLERU-BUSTER

(Orange) ...... Lights up in Powerful

Operation.

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

Operation.

(Blue) ... Lights up in operation.

Operation Mode

• Heating, Cooling, Soft Dry and Automatic

Operation.

Powerful Operation

• Reaches the desired room temperature quickly.

Random Auto Restart Control

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

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 can be manually adjusted by hand.

Anti-Freezing Control

• To prevent indoor heat exchanger from freezing.

Starting Current Control

• To reduce the starting current.

Time Delay Safety Control

• Restarting is inhibited for appro. 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.

30 Minutes Time Save Control

• Heating operation only.

Timer Operation

• Delay OFF/ON Timer control.

Quiet Operation

• To provide quiet operation.

Ionizer Operation

• Generate and discharge negative ion.

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-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

3 Product Specifications

3.1. CS-A7DKD CU-A7DKD

Unit Indoor Unit Outdoor Unit

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

Cooling Capacity kW (BTU/h) 2.00 - 2.00 (6,820 - 6,820)

Heating Capacity kW (BTU/h) 2.10 - 2.10 (7,160 - 7,160)

Moisture Removal l/h (Pint/h) 1.3 (2.7)

Airflow Method OUTLET

INTAKE

Air Volume Lo m3/min (cfm) Cooling; 5.8 (205) - 5.8 (205)

Me m3/min (cfm) Cooling; 6.8 (241) - 6.8 (241)

Hi m3/min (cfm) Cooling; 7.8 (280) - 7.8 (280)

SHi m3/min (cfm) Cooling; 9.1 (320) - 9.1 (320)

Noise Level dB (A) Cooling; High 33 - 33, Low 26 - 26

Power level dB Cooling; High 46 - 46

Electrical Data Input Power kW Cooling; 0.61 - 0.63

Running Current A Cooling; 2.9 - 2.8

EER W/W (BTU/hW) Cooling; 3.28 - 3.17 (11.2 - 10.8) COP - (BTU/hW) Heating; 4.2 - 4.0 (14.3 - 13.6) Starting Current A 12.4

Piping Connection Port (Flare piping)

Pipe Size (Flare piping)

Drain Hose

Power Cord Length m 1.9 —

Dimensions Height inch (mm) 11 - 1/32 (280) 20 - 3/32 (510)

Net Weight lb (kg) 20 (9.0) 53 (24) Compressor Description — Rotary (1 cylinder)

Inner diame ter mm 12 — Length mm 650 —

Number of core-wire 3 (1.5 mm2) —

Width inch (mm) 31 - 15/32 (799) 25 - 19/32 (650) Depth inch (mm) 7 - 7/32 (183) 9 - 1/16 (230)

Motor Type — Induction (2-poles) Rated Output W — 550

inch inch

Heating; 6.2 (219) - 6.2 (219)

Heating; 6.8 (241) - 6.8 (241)

Heating; 9.0 (320) - 9.0 (320)

Heating; High 36 - 36, Low 28 - 28

SIDE VIEW TOP VIEW

Cooling; 29.5 (1,040 ) - 30.0

Heating; —

Cooling; High 46 - 47 Heating; High 48 - 49

Heating; High 49 - 49

Heating; 0.50 - 0.525

Heating; 2.4 - 2.4

G ; Half Union 3/8”

L ; Half Union 1/4” G ; (gas side) 3/8”

L ; (liquid side) 1/4”

Cooling; High 61 - 62 Heating; High 64 - 65

G ; 3-way valve 3/8”

L ; 2-way valve 1/4”

G ; (gas side) 3/8”

L ; (liquid side) 1/4”

rolling piston type

—

(1,060)

—

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

Unit Indoor Unit Outdoor Unit

Fan Motor Description Cross-flow Fan Propeller Fan

Material AS + Glass Fiber 20% PP Resin Type Induction (4-poles) Induction (6-poles) Input W 60.5 - 66.0 66 - 74.8 Rated Output W 15 30 Fan Speed Low rpm Cooling; 780 - 780

Medium rpm Cooling; 920 - 920

High rpm Cooling; 1,050 - 1,050

SuperHigh rpm Cooling; 1,220 - 1,220

Heat Exchanger Description Evaporator Condenser

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

FPI 21 17 Size (W × H × L) mm 610 × 315 × 25.4 585.7

Refrigerant Control Device — Capillary Tube Refrigeration Oil (cm3) — ATMOS M60 OR SUNISO 4GDID Refrigerant (R22) g (oz) — 690 (24.3) Thermostat — — Protection Device — Overload Protector Capillary Tube Length mm — Cooling; 330, Heating; 566

Flow Rate l/min — Cooling; 20.6, Heating; 9.5 Inner Diameter mm — Cooling; 1.7, Heating; 1.4

Air Filter Material

Style Capacity Control Capillary Tube Compressor Capacitor µF, VAC — 20 µF, 370VAC Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC

Heating; 840 - 840

Heating; 920 - 920

Heating; 1,220 - 1,220

Heating; —

2×15 2×23

557.1

P.P.

Honeycomb

—

800 - 830

—

× 484 × 36.4

—

Note:

• Specifications are subjected to change without prior notice for further improvement.

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

3.2. CS-A9DKD CU-A9DKD

Unit Indoor Unit Outdoor Unit

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

Cooling Capacity kW (BTU/h) 2.65 -2.65 (9,040 - 9,040)

Heating Capacity kW (BTU/h) 2.80 - 2.85 (9,550 - 9,720)

Moisture Removal l/h (Pint/h) 1.6 (3.4)

Airflow Method OUTLET

INTAKE

Air Volume Lo m3/min (cfm) Cooling; 5.8 (204) - 5.8 (204)

Me m3/min (cfm) Cooling; 7.1 (251) - 7.1 (251)

Hi m3/min (cfm) Cooling; 8.6 (300) - 8.6 (300)

SHi m3/min (cfm) Cooling; 9.4 (333) - 9.4 (333)

Noise Level dB (A) Cooling; High 36 - 36, Low 26 - 26

Power level dB Cooling; High 49 - 49

Electrical Data Input Power kW Cooling; 0.83 - 0.86

Running Current A Cooling; 3.9 - 3.9

EER W/W (BTU/hW) Cooling; 3.19 - 3.08 (10.9 - 10.5) COP - (BTU/hW) Heating; 4.00 - 3.85 (13.6 - 13.1) Starting Current A 18.0

Piping Connection Port (Flare piping)

Pipe Size (Flare piping)

Drain Hose

Power Cord Length m 1.9 —

Dimensions Height inch (mm) 11 - 1/32 (280) 20 - 3/32 (510)

Net Weight lb (kg) 20 (9.0) 60 (27) Compressor Description — Rotary (1 cylinder)

Inner diame ter mm 12 — Length mm 650 —

Number of core-wire 3 (1.5 mm2) —

Width inch (mm) 31 - 15/32 (799) 25 - 19/32 (650) Depth inch (mm) 7 - 7/32 (183) 9 - 1/16 (230)

Motor Type — Induction (2-poles) Rated Output W — 750

inch inch

Heating; 6.2 (220) - 6.2 (220)

Heating; 7.1 (251) - 7.1 (251)

Heating; 9.4 (330) - 9.4 (330)

Heating; High 38 - 38, Low 28 - 28

SIDE VIEW TOP VIEW

Cooling; 29.5 (1,040 ) - 30.0

Heating; —

Cooling; High 48 - 49 Heating; High 48 - 49

Heating; High 51 - 51

Heating; 0.70 - 0.74

Heating; 3.3 - 3.3

G ; Half Union 3/8”

L ; Half Union 1/4” G ; (gas side) 3/8”

L ; (liquid side) 1/4”

Cooling; High 63 - 64 Heating; High 64 - 65

G ; 3-way valve 3/8”

L ; 2-way valve 1/4”

G ; (gas side) 3/8”

L ; (liquid side) 1/4”

rolling piston type

—

(1,060)

—

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

Unit Indoor Unit Outdoor Unit

Fan Motor Description Cross-flow Fan Propeller Fan

Material AS + Glass Fiber 20% PP Resin

Type Induction (4-poles) Induction (6-poles)

Input W 60.5 - 66.0 66 - 74.8

Rated Output W 15 30

Fan Speed Low rpm Cooling; 780 - 780

Medium rpm Cooling; 960 - 960

High rpm Cooling; 1,160 - 1,160

SuperHigh rpm Cooling; 1,270 - 1,220

Heat Exchanger Description Evaporator Condenser

Tube material Copper Copper

Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)

Fin Type Slit Fin Corrugated Fin

Row / Stage (Plate fin configuration, forced draft)

FPI 19 17

Size (W × H × L) mm 610 × 315 × 25.4 585.7

Refrigerant Control Device — Capillary Tube Refrigeration Oil (cm3) — ATMOS M60 OR SUNISO 4GDID Refrigerant (R22) g (oz) — 730 (25.8) Thermostat — — Protection Device — Overload Protector Capillary Tube Length mm — Cooling; 890, Heating; 890

Flow Rate l/min — Cooling; 9.5, Heating; 9.5

Inner Diameter mm — Cooling; 1.5, Heating; 1.5 Air Filter Material

Style Capacity Control Capillary Tube Compressor Capacitor µF, VAC — 30 µF, 370VAC Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC

Heating; 840 - 840

Heating; 960 - 960

Heating; 1,270 - 1,270

Heating; —

2×15 2×23

557.1

P.P.

Honeycomb

—

800 - 830

—

× 484 × 36.4

—

Note:

• Specifications are subjected to change without prior notice for further improvement.

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

3.3. CS-A12DKD CU-A12DKD

Unit Indoor Unit Outdoor Unit

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

Cooling Capacity kW (BTU/h) 3.52 - 3.54 (12,000 - 12,100)

Heating Capacity kW (BTU/h) 4.00 - 4.05 (13,650 - 13,810)

Moisture Removal l/h (Pint/h) 2.0 (4.2)

Airflow Method OUTLET

INTAKE

Air Volume Lo m3/min (cfm) Cooling; 6.7 (236) - 6.7 (236)

Me m3/min (cfm) Cooling; 8.3 (294) - 8.3 (294)

Hi m3/min (cfm) Cooling; 9.5 (340) - 9.5 (340)

SHi m3/min (cfm) Cooling; 9.7 (343) - 9.7 (343)

Noise Level dB (A) Cooling; High 39 - 39, Low 29 - 29

Power level dB Cooling; High 52 - 52

Electrical Data Input Power kW Cooling; 1.08 - 1.15

Running Current A Cooling; 5.1 - 5.1

EER W/W (BTU/hW) Cooling; 3.26 - 3.16 (11.1 - 10.8) COP W/W (BTU/hW) Heating; 3.67 - 3.62 (12.5 - 12.3) Starting Current A 27.0

Piping Connection Port (Flare piping)

Pipe Size (Flare piping)

Drain Hose

Power Cord Length m 1.9 —

Dimensions Height inch (mm) 11 - 1/32 (280) 21 - 1/4 (540)

Net Weight lb (kg) 20 (9.0) 82 (37) Compressor Description — Rotary (1 cylinder) rolling piston

Inner diame ter mm 12 — Length mm 650 —

Number of core-wire 3 (1.5 mm2) —

Width inch (mm) 31 - 15/32 (799) 30 - 23/32 (780) Depth inch (mm) 7 - 7/32 (183) 11 - 3/8 (289)

Motor Type — Induction (2-poles) Rated Output W — 950

inch inch

Heating; 7.1 (251) - 7.1 (251)

Heating; 8.3 (293) - 8.3 (293)

Heating; 9.7 (340) - 9.7 (340)

Heating; High 40 - 40, Low 29 - 29

SIDE VIEW TOP VIEW

Cooling; 32.5 (1,150 ) - 33.5

Heating; —

Cooling; High 48 - 49 Heating; High 48 - 49

Heating; High 53 - 53

Heating; 1.09 - 1.12

Heating; 5.2 - 5.1

G ; Half Union 1/2” L ; Half Union 1/4”

G ; (gas side) 1/2”

L ; (liquid side) 1/4”

Cooling; High 63 - 64 Heating; High 64 - 65

G ; 3-way valve 1/2”

L ; 2-way valve 1/4”

G ; (gas side) 1/2”

L ; (liquid side) 1/4”

—

(1,180)

—

type

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

Unit Indoor Unit Outdoor Unit

Fan Motor Description Cross-flow Fan Propeller Fan

Material AS + Glass Fiber 20% PP Resin

Motor Type Induction (4-poles) Induction (6-poles)

Input W 60.5 - 66.0 71.5 - 80.3 Rated Output W 15 31 Fan Speed Low rpm Cooling; 900 - 900

Medium rpm Cooling; 1,120 - 1,120

High rpm Cooling; 1,280 - 1,280

SuperHigh rpm Cooling; 1,310 - 1,310

Heat Exchanger Description Evaporator Condenser

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

FPI 21 16 Size (W × H × L) mm 610 × 315 × 25.4 720 × 504 × 36.38

Refrigerant Control Device — Capillary Tube Refrigeration Oil (cm3) — ATMOS M0 OR SUNISO 4GDID Refrigerant (R-22) g (oz) — 1,080 (38.1) Thermostat — — Protection Device — — Capillary Tube Length mm — Cooling; 630, Heating; 455

Flow Rate l/min — Cooling; 6.5, Heating; 13.6 Inner Diameter mm — Cooling; 1.2 Heating; 1.5

Air Filter Material

Style

Capacity Control Capillary Tube Compressor Capacitor µF, VAC — 35 µF, 370VAC Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC

Heating; 960 - 960

Heating; 1,120 - 1,120

Heating;1,310 - 1,310

Heating; —

2×15 2×24

P.P.

Honeycomb

—

845 - 860

—

Note:

• Specifications are subjected to change without prior notice for further improvement.

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

4 Dimensions

4.1. Indoor Unit & Remote Control

4.2. Outdoor Unit

4.2.1. CU-A7DKD / CU-A9DKD

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

4.2.2. CU-A12DKD

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

5 Refrigeration Cycle Diagram

6 Block Diagram

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

7 Wiring Diagram

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

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-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

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-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

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-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

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 referring 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 operation mode will be continued, if the room temperature does not reach to set temperature (Compressor keeps running) eventhough 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 Above 25°C) 25°C & below)

Automatic Set Temperature Refer as below.

• Automatic Set Temperature

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

However it can be selected 2°C higher or 2°C lower from standard set temperature by pressing the “Room Temperature Setting button”.

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 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.

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

• 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.

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.

s T = Intake air temperature - Indoor heat exchanger temperature

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

CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12D KD /

(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.

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(For 8.5.8. to 8.5.14. information applies only to Heating Operation)

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 (CLo, Lo- or QLo).

• This control is cancelled immediately when above condition is changed, or Powerful button is pressed.

• Anti-Dew formation is control by:

1. CLo fan is changed to HLo fan.

2. QLo fan is changed to HLo fan.

8.5.8. 30 Minutes Time Save Control

• The compressor will start automatically if it has stopped for 30 minutes and the intake air temperature falls between the

compressor OFF temperature (A) and compressor ON temperature (B) during the period.

• This is to maintain the room temperature as set. Despite of this, it is to prevent a wrong judgement of intake air temperature due

to poor installation near the sensor area.

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8.5.9. Compressor Overload Protection Control

Outdoor Fan Control

• If the temperature of the indoor heat exchanger rises to 51°C, outdoor fan stops. The outdoor fan restarts when the indoor

heat exchanger temperature falls to 49°C.

Compressor high pressure protection

• If the indoor heat exchanger becomes 65°C or more, the compressor will stop and restart automatically.

(Time Delay Safety Control - 4 minutes waiting).

• This is to reduce the pressure, as to reduce the indoor heat exchanger temp. Nevertheless, is to protect the compressor

from overload of too high temperature.

8.5.10. 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.

8.5.11. 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.

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8.5.12. 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 39°C or operation over 4 minutes.

8.5.13. 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 (Thermo 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.

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