Panasonic CS-S9NKR, CS-S12NKR, CS-S18NKR, CS-S24NKR, CS-S28NKR Service Manual

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Page 1

Order No: PAPAMY1207092CE

Indoor Unit Outdoor Unit

CS-S9NKR CS-S12NKR CS-S18NKR CS-S24NKR CS-S28NKR

CU-S9NKR CU-S12NKR CU-S18NKR CU-S24NKR CU-S28NKR

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the products dealt with in this service information by anyone else could result in serious injury or death.

PRECAUTION OF LOW TEMPERATURE

In order to avoid frostbit, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

Page 2

TABLE OF CONTENTS

1. Safety Precautions .............................................3

2. Specification .......................................................5

3. Location of Controls and Components..........11

3.1 Indoor Unit ..................................................11

3.2 Outdoor Unit ...............................................11

3.3 Remote Control ..........................................11

4. Dimensions .......................................................12

4.1 Indoor Unit ..................................................12

4.2 Outdoor Unit ...............................................14

5. Refrigeration Cycle Diagram ...........................15

5.1 CS-S9NKR CU-S9NKR

CS-S12NKR CU-S12NKR..........................15

5.2 CS-S18NKR CU-S18NKR

CS-S24NKR CU-S24NKR

CS-S28NKR CU-S28NKR..........................16

6. Block Diagram ..................................................17

6.1 CS-S9NKR CU-S9NKR

CS-S12NKR CU-S12NKR..........................17

6.2 CS-S18NKR CU-S18NKR..........................18

6.3 CS-S24NKR CU-S24NKR..........................19

6.4 CS-S28NKR CU-S28NKR..........................20

7. Wiring Connection Diagram ............................21

7.1 Indoor Unit ..................................................21

7.2 Outdoor Unit ...............................................23

8. Electronic Circuit Diagram ..............................27

8.1 Indoor Unit ..................................................27

8.2 Outdoor Unit ...............................................29

9. Printed Circuit Board .......................................33

9.1 Indoor Unit ..................................................33

9.2 Outdoor Unit ...............................................35

10. Installation Instruction.....................................39

10.1 Select The Best Location ...........................39

10.2 Indoor Unit ..................................................40

10.3 Outdoor Unit ...............................................44

11. Operation Control.............................................48

11.1 Basic Function ............................................48

11.2 Indoor Fan Motor Operation .......................49

11.3 Outdoor Fan Motor Operation ....................50

11.4 Airflow Direction..........................................50

11.5 Quiet Operation (Cooling Mode/Cooling Area

of Dry Mode)...............................................51

11.6 Powerful Mode Operation...........................52

11.7 Economy Mode Operation..........................52

11.8 Timer Control..............................................52

11.9 Auto Restart Control...................................53

11.10 Indication Panel ..........................................53

12. Protection Control............................................54

12.1 Protection Control For All Operations.........54

12.2 Protection Control For Cooling & Soft Dry

Operation....................................................56

13. Servicing Mode................................................ 58

13.1 Auto Off/On Button .................................... 58

13.2 Remote Control Button.............................. 59

14. Troubleshooting Guide................................... 60

14.1 Refrigeration Cycle System....................... 60

14.2 Breakdown Self Diagnosis Function.......... 62

14.3 Error Code Table ....................................... 63

14.4 Troubleshooting Flowchart ........................ 64

15. Disassembly and Assembly Instructions ..... 89

15.1 CS-S9NKR CS-S12NKR .......................... 89

15.2 CS-S18NKR CS-S24NKR CS-S28NKR.. 93

15.3 Outdoor Electronic Controller Removal

Procedures ................................................ 97

15.4 Outdoor Electronic Controller Removal

Procedures ................................................ 99

16. Technical Data ............................................... 101

16.1 Operation Characteristics........................ 101

16.2 Sensible Capacity Chart.......................... 111

17. Exploded View and Replacement Parts List114

17.1 Indoor Unit ............................................... 114

17.2 Outdoor Unit ............................................ 118

Page 3

CAUTION

WARNING

1. Safety Precautions

• Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing.

• Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the

power plug and main circuit for the model 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 or servicing 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

This indication shows the possibility of causing injury or damage to properties.

• The items to be followed are classified by the symbols:

• Carry out test run to confirm that no abnormality occurs after the servicing. 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. Do not modify the machine, part, material during repairing service.

2. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit.

3. Do not wrench the fasten terminal. Pull it out or insert it straightly.

4. Engage dealer or specialist for installation and servicing. If installation of servicing done by the user is defective, it will cause water leakage,

electrical shock or fire.

5. Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire.

6. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, fire

or electrical shock.

7. 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.

8. For electrical work, follow the local national wiring standard, regulation and the installation instruction. 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.

9. This equipment is strongly recommended to install with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD). Otherwise, it

may cause electrical shock and fire in case equipment breakdown or insulation breakdown.

10. Use the specified cable 1.5 mm2 (1.0 ~ 1.75HP) or 2.5mm2 (2.0 ~ 2.5HP), and connect tightly for indoor/outdoor connection. Connect 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-up or fire at the connection.

11. 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 or fire at the connection point of terminal, fire or electrical shock.

12. 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, abnormal high pressure in the refrigeration cycle, explosive and injury.

13. Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit at veranda of high rise building, child may

climb up to outdoor unit and cross over the handrail and causing accident.

14. This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and

telephone. Otherwise, it may cause electric shock in case equipment breakdown or insulation breakdown.

15. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing.

16. Do not damage or use unspecified power supply cord. Otherwise it will cause fire or electric shock.

17. Do not modify the length of the power supply cord or use extension cord, and do not share the single outlet with other electric

appliances. Otherwise, it will cause fire or electric shock.

18. In case of using existing (R22) pipes during installation of R410 models, must carry out pump down properly to collect back the

refrigerant and oil before installation new unit. Thickness of copper pipes used with R410A must be more than 0.6mm. Never use copper pipes thinner than 0.6mm. It is desirable that the amount of residual oil is less than 40 mg/10m.

This symbol denotes item that is PROHIBITED from doing.

Page 4

CAUTION

19. During installation, before run the compressor, confirm the refrigerant pipes are fixed. Operation of compressor without fixing the piping, setting the valves at open condition, a burst may occur and cause injury.

20. During pump down operation, stop the compressor before remove the refrigerant piping. When remove piping while valves at open condition, burst may occur and cause injury.

21. After completion of installation or service, confirm there is no leakage or refrigerant gas. It may generate toxic gas when the refrigerant contacts with fire.

22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when refrigerant contacts with fire.

23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.

24. Must not use other parts except original parts describe in catalog and manual.

1. 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.

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

3. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage.

4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.

5. Select an installation location which is easy for maintenance.

6. Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use a high temperature solder 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).

7. Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of the following methods. 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 room air conditioner to the power supply is prohibited. i. Power supply connection to the receptacle using a power plug. Use an approved 15/16A (1.0 ~ 1.75HP) or 16A (2.0HP) or 20A (2.5HP) power plug with earth pin for the connection to the socket. ii. Power supply connection to a circuit breaker for the permanent connection. Use an approved 16A (1.0 ~ 2.0HP) or 20A (2.5HP) circuit breaker for the permanent connection. It must be a double pole switch with a minimum 3.0 mm contact gap.

8. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take care of the liquid refrigerant, it may cause frostbite.

9. Installation or servicing work: It may need two people to carry out the installation or servicing work.

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

11. Do not sit or step on the unit, you may fall down accidentally.

12. Do not touch the sharp aluminium fin, sharp parts may cause injury. If you are required to handle sharp parts during installation or servicing, please wear hand glove. Sharp parts may cause injury.

Page 5

2. Specification

Indoor CS-S9NKR CS-S12NKR

Model

Outdoor CU-S9NKR CU-S12NKR

Performance Test Condition AS AS

Phase, Hz Single, 50 Single, 50

Power Supply

V 230 240 230 240

Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. Min. Mid. Max.

kW 0.90 2.60 3.00 0.90 2.60 3.00 0.90 3.50 4.00 0.90 3.50 4.00

BTU/h 3070 8870 10200 3070 8870 10200 3070 11900 13600 3070 11900 13600

Capacity

kcal/h 770 2240 2580 770 2240 2580 770 3010 3440 770 3010 3440

Running Current A - 3.0 - - 2.9 - - 4.1 - - 4.0 -

Input Power W 240 630 880 240 630 880 250 860 1.18k 250 860 1.18k

W/W 3.75 4.13/3.0 3.41 3.75 4.13/3.0 3.41 3.60 4.07/3.0 3.39 3.60 4.07/3.0 3.39

Btu/hW 12.79 14.08 11.59 12.79 14.08 11.59 12.28 13.84 11.53 12.28 13.84 11.53

EER

kcal/hW 3.21 3.56 2.93 3.21 3.56 2.93 3.08 3.50 2.92 3.08 3.50 2.92

Power Factor % - 91 - - 91 - - 91 - - 90 -

dB-A 37 / 26 / 21 37 / 26 / 21 38 / 28 / 21 38 / 28 / 21

Indoor Noise

(H / L / QLo)

Power Level

53 / 42 / 37 53 / 42 / 37 54 / 44 / 37 54 / 44 / 37

dB-A 47 / - / - 47 / - / - 48 / - / - 48 / - / -

Cooling

Outdoor Noise

(H / L / QLo)

Power Level

62 / - / - 62 / - / - 63 / - / - 63 / - / -

Max Current (A) / Max Input Power (W) 5.7 / 1.25k 7.5 / 1.69k

Starting Current (A) 3.0 4.1

Type Hermetic Motor Hermetic Motor

Motor Type Brushless (6 poles) Brushless (6 poles)

Compressor

Output Power W 650 650

Type Cross-flow fan Cross-flow fan

Material ASG20K1 ASG20K1

Motor Type Induction (4 poles) Induction (4 poles)

Input Power W 43.9 - 48.9 43.9 - 48.9

Output Power W 24 24

QLo rpm 620 - 620 620 - 620

Lo rpm 740 - 740 780 - 780

Me rpm 890 - 890 930 - 930

Hi rpm 1050 - 1050 1080 - 1080

Indoor Fan

Speed

SHi rpm 1150 - 1150 1200 - 1200

Type Propeller Propeller

Material PP PP

Motor Type Induction (6 poles) Induction (6 poles)

Input Power W - -

Output Power W 24 25

Outdoor Fan

Speed Hi rpm 820 - 840 830 - 850

Moisture Removal L/h (Pt/h) 1.6 (3.4) 2.0 (4.2)

QLo m3/min (ft3/m) 5.29 (187) 5.29 (187)

Lo m3/min (ft3/m) 6.73 (238) 7.35 (260)

Me m3/min (ft3/m) 8.36 (295) 9.02 (318)

Hi m3/min (ft3/m) 10.1 (355) (168) 10.7 (380) (178)

Indoor Airflow

SHi m

/min (ft3/m) 11.26 (398) 12.04 (425)

Outdoor Airflow Hi m3/min (ft3/m) 35.1 (1240) 36.0 (1270) 31.7 (1120) 32.5 (1145)

Page 6

Indoor CS-S9NKR CS-S12NKR

Model

Outdoor CU-S9NKR CU-S12NKR

Control Device

Capillary Tube Capillary Tube

Refrigerant

Oil

FV50S (320) FV50S (320)

Refrigeration

Cycle

Refrigerant

Type

g (oz) R410A, 860 (30.4) R410A, 1.06k (37.4)

Height

(I/D / O/D)

mm (inch) 290 (11-7/16) / 619 (24-3/8) 290 (11-7/16) / 619 (24-3/8)

Width

(I/D / O/D)

mm (inch) 870 (34-9/32) / 824 (32-15/32) 870 (34-9/32) / 824 (32-15/32)

Dimension

Depth

(I/D / O/D)

mm (inch) 214 (8-7/16) / 299 (11-25/32) 214 (8-7/16) / 299 (11-25/32)

Weight

Net

(I/D / O/D)

kg (lb) 9 (20) / 30 (66) 9 (20) / 32 (71)

Pipe Diameter

(Liquid / Gas)

mm (inch) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 12.70 (1/2)

Standard length m (ft) 7.5 (24.6) 7.5 (24.6)

Length range (min – max) m (ft) 3 (9.8) ~ 15 (49.2) 3 (9.8) ~ 15 (49.2)

I/D & O/D Height different m (ft) 15 (49.2) 15 (49.2)

Additional Gas Amount g/m (oz/ft) 15 (0.2) 15 (0.2)

Piping

Length for Additional Gas m (ft) 7.5 (24.6) 7.5 (24.6)

Inner

Diameter

mm 16.7 16.7

Drain Hose

Length mm 550 550

Fin Material Aluminium (Pre coat) Aluminium (Pre coat)

Fin Type Slit Fin Slit Fin

Row × Stage

× FPI

2 × 15 × 21 2 × 15 × 21

Indoor Heat

Exchanger

Size

× H × L)

mm 610 × 315 × 25.4 610 × 315 × 25.4

Fin Material Aluminium (Blue coated) Aluminium (Blue coated)

Fin Type Slit Fin Slit Fin

Row × Stage

× FPI

1 × 28 × 17 2 × 28 × 17

Outdoor Heat

Exchanger

Size

× H × L)

mm 12.7 × 588 × 795.8 25.4 × 588 × 790.3:770.4

Material Polypropelene Polypropelene

Air Filter

Type One-touch One-touch

Power Supply Outdoor Outdoor

Power Supply Cord A - -

Thermostat - -

Protection Device - -

DRY BULB WET BULB DRY BULB WET BULB

Maximum 32 23 32 23

Indoor Operation Range

Minimum 16 11 16 11

Maximum 46 26 46 26

Outdoor Operation Range

Minimum 5 4 5 4

1. Cooling capacities are based on indoor temperature of 27°C DRY BULB (80.6°F DRY BULB), 19.0°C WET BULB (66°F WET BULB) and outdoor air temperature of 35°C DRY BULB (95°F DRY BULB), 24°C WET BULB (75.2°F WET BULB).

Page 7

Indoor CS-S18NKR

Model

Outdoor CU-S18NKR

Performance Test Condition AS

Phase, Hz Single, 50

Power Supply

V 230 240

Min. Mid. Max. Min. Mid. Max.

kW 0.90 5.00 6.00 0.90 5.00 6.00

BTU/h 3070 17100 20500 3070 17100 20500

Capacity

kcal/h 770 4300 5160 770 4300 5160

Running Current A - 5.9 - - 5.7 -

Input Power W 240 1.30k 1.85k 240 1.30k 1.85k

W/W 3.75 3.85/2.5 3.24 3.75 3.85/2.5 3.24

Btu/hW 12.79 13.15 11.08 12.79 13.15 11.08

EER

kcal/hW 3.21 3.31 2.79 3.21 3.31 2.79

Power Factor % - 96 - - 95 -

dB-A 42 / 34 / 31 42 / 34 / 31

Indoor Noise

(H / L / QLo)

Power Level

58 / 50 / 47 58 / 50 / 47

dB-A 47 / - / 42 47 / - / 42

Cooling

Outdoor Noise

(H / L / QLo)

Power Level

61 / - / 56 61 / - / 56

Max Current (A) / Max Input Power (W) 9.5 / 2.23k

Starting Current (A) 5.9

Type Hermetic Motor

Motor Type Brushless (6 poles)

Compressor

Output Power

W 900

Type Cross-flow fan

Material ASG30K1

Motor Type Transistor (8 poles)

Input Power W 94.8 - 94.8

Output Power W 40

QLo rpm 870 - 870

Lo rpm 950 - 950

Me rpm 1090 - 1090

Hi rpm 1220 - 1220

Indoor Fan

Speed

SHi rpm 1320 - 1320

Type Propeller

Material PP

Motor Type Induction (6 poles)

Input Power W -

Output Power W 40

Outdoor Fan

Speed Hi rpm 530 - 550

Moisture Removal L/h (Pt/h) 2.8 (5.9)

QLo m3/min (ft3/m) 10.88 (384)

Lo m3/min (ft3/m) 12.07 (426)

Me m3/min (ft3/m) 14.07 (497)

Hi m3/min (ft3/m) 16.0 (565) (267)

Indoor Airflow

SHi m

/min (ft3/m) 17.6 (621)

Outdoor Airflow Hi m3/min (ft3/m) 39.7 (1400) 41.3 (1460)

Page 8

Indoor CS-S18NKR

Model

Outdoor CU-S18NKR

Control Device

Expansion Valve

Refrigerant

Oil

FV50S (450)

Refrigeration

Cycle

Refrigerant

Type

g (oz) R410A, 1.31k (46.2)

Height

(I/D / O/D)

mm (inch) 290 (11-7/16) / 795 (31-5/16)

Width

(I/D / O/D)

mm (inch) 1070 (42-5/32) / 875 (34-15/32)

Dimension

Depth

(I/D / O/D)

mm (inch) 240 (9-15/32) / 320 (12-5/8)

Weight

Net

(I/D / O/D)

kg (lb) 12 (26) / 50 (110)

Pipe Diameter (Liquid / Gas)

mm (inch) 6.35 (1/4) / 12.70 (1/2)

Standard length m (ft) 5.0 (16.4)

Length range

(min – max)

m (ft) 3 (9.8) ~ 20 (65.6)

I/D & O/D Height

different

m (ft) 15 (49.2)

Additional Gas Amount g/m (oz/ft) 20 (0.2)

Piping

Length for Additional

Gas

m (ft) 10 (32.8)

Inner

Diameter

mm 16.7

Drain Hose

Length mm 550

Fin Material Aluminium (Pre coat)

Fin Type Slit Fin

Row × Stage

× FPI

2 × 15 × 19

Indoor Heat

Exchanger

Size

× H × L)

mm 810 × 315 × 25.4

Fin Material Aluminium (Blue coated)

Fin Type Slit Fin

Row × Stage

× FPI

2 × 36 × 17

Outdoor Heat

Exchanger

Size

× H × L)

mm 25.4 × 756 × 847.9:827.9

Material Polypropelene

Air Filter

Type One-touch

Power Supply Outdoor

Power Supply Cord A -

Thermostat -

Protection Device -

DRY BULB WET BULB

Maximum 32 23

Indoor Operation Range

Minimum 16 11

Maximum 46 26

Outdoor Operation Range

Minimum 5 4

Page 9

Indoor CS-S24NKR CS-S28NKR

Model

Outdoor CU-S24NKR CU-S28NKR

Performance Test Condition AS AS

Phase, Hz Single, 50 Single, 50

Power Supply

V 230 240 230 240

Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. Min. Mid. Max.

kW 2.00 7.10 7.70 2.00 7.10 7.70 2.10 8.00 8.40 2.10 8.00 8.40

BTU/h 6820 24200 26300 6820 24200 26300 7160 27300 28600 7160 27300 28600

Capacity

kcal/h 1720 6110 6620 1720 6110 6620 1810 6880 7220 1810 6880 7220

Running Current A - 9.8 - - 9.5 - - 11.3 - - 11.0 -

Input Power W 470 2.18k 2.40k 470 2.18k 2.40k 430 2.46k 2.60k 430 2.46k 2.60k

W/W 4.26

3.26 /

2.0

3.21 4.26 3.26 / 2.0 3.21 4.88 3.25 / 1.5 3.23 4.88

3.25 /

1.5

3.23

Btu/hW 14.51 11.10 10.96 14.51 11.10 10.96 16.65 11.10 11.00 16.65 11.10 11.00

EER

kcal/hW 3.66 2.80 2.76 3.66 2.80 2.76 4.21 2.80 2.78 4.21 2.80 2.78

Power Factor % - 97 - - 96 - - 95 - - 93 -

dB-A 47 / 38 / 35 47 / 38 / 35 50 / 38 / 35 50 / 38 / 35

Indoor Noise

(H / L / QLo)

Power Level

63 / 54 / 51 63 / 54 / 51 66 / 54 / 51 66 / 54 / 51

dB-A 52 / - / 47 52 / - / 47 54 / - / 49 54 / - / 49

Cooling

Outdoor Noise

(H / L / QLo)

Power Level

66 / - / 61 66 / - / 61 68 / - / 63 68 / - / 63

Max Current (A) / Max Input Power (W) 14.4 / 3.25k 14.6 / 3.26k

Starting Current (A) 9.8 11.3

Type Hermetic Motor Hermetic Motor

Motor Type Brushless (4 poles) Brushless (4 poles)

Compressor

Output Power W 1.70k 1.70k

Type Cross-flow fan Cross-flow fan

Material ASG30K1 ASG30K1

Motor Type Transistor (8-poles) Transistor (8-poles)

Input Power W 94.8 - 94.8 94.8 - 94.8

Output Power W 40 40

QLo rpm 950 950

Lo rpm 1050 1050

Me rpm 1240 1290

Hi rpm 1430 1540

Indoor Fan

Speed

SHi rpm 1530 1570

Type Propeller Propeller

Material PP PP

Motor Type Induction (6-poles) DC (8-poles)

Input Power W - -

Output Power W 80 60

Outdoor Fan

Speed Hi rpm 670 700

Moisture Removal L/h (Pt/h) 4.1 (8.7) 4.7 (9.9)

QLo m3/min (ft3/m) 11.82 (417) 11.82 (417)

Lo m3/min (ft3/m) 13.28 (469) 13.28 (469)

Me m3/min (ft3/m) 16.09 (568) 16.77 (592)

Hi m3/min (ft3/m) 18.4 (650) (307) 20.4 (720) (340)

Indoor Airflow

SHi m

/min (ft3/m) 20.20 (713) 20.84 (736)

Outdoor Airflow Hi m3/min (ft3/m) 50.2 (1770) 51.9 (1830) 53.5 (1890) 53.5 (1890)

Page 10

Indoor CS-S24NKR CS-S28NKR

Model

Outdoor CU-S24NKR CU-S28NKR

Control

Device

Capillary Tube Expansion Valve

Refrigerant

Oil

FV50S (800) FV50S (800)

Refrigeration

Cycle

Refrigerant

Type

g (oz) R410A, 1.58k (55.8) R410A, 1.77k (62.5)

Height

(I/D / O/D)

mm (inch) 290 (11-7/16) / 795 (31-5/16) 290 (11-7/16) / 795 (31-5/16)

Width

(I/D / O/D)

mm (inch) 1070 (42-5/32) / 875 (34-15/32) 1070 (42-5/32) / 875 (34-15/32)

Dimension

Depth

(I/D / O/D)

mm (inch) 240 (9-15/32) / 320 (12-5/8) 240 (9-15/32) / 320 (12-5/8)

Weight

Net

(I/D / O/D)

kg (lb) 12 (26) / 56 (123) 12 (26) / 57 (126)

Pipe Diameter

(Liquid / Gas)

mm (inch) 6.35 (1/4) / 15.88 (5/8) 6.35 (1/4) / 15.88 (5/8)

Standard length m (ft) 5.0 (16.4) 5.0 (16.4)

Length range (min – max) m (ft) 3 (9.8) ~ 30 (98.4) 3 (9.8) ~ 30 (98.4)

I/D & O/D Height different m (ft) 20 (65.6) 20 (65.6)

Additional Gas Amount g/m (oz/ft) 30 (0.3) 30 (0.3)

Piping

Length for Additional Gas m (ft) 10 (32.8) 10 (32.8)

Inner

Diameter

mm 16.7 16.7

Drain Hose

Length mm 650 650

Fin Material Aluminium (Pre coat) Aluminium (Pre coat)

Fin Type Slit Fin Slit Fin

Row × Stage

× FPI

2 × 15 × 21 2 × 15 × 21

Indoor Heat

Exchanger

Size

× H × L)

810 × 315 × 25.4

Fin Material Aluminium (Blue coated) Aluminium (Blue coated)

Fin Type Slit Fin Slit Fin

Row × Stage

× FPI

2 × 36 × 17 2 × 36 × 17

Outdoor Heat

Exchanger

Size

× H × L)

mm 25.4 × 756 × 905.9:885.9 25.4 × 756 × 905.9:885.9

Material Polypropelene Polypropelene

Air Filter

Type One-touch One-touch

Power Supply Outdoor Outdoor

Power Supply Cord A - -

Thermostat - -

Protection Device - -

DRY BULB WET BULB DRY BULB WET BULB

Maximum 32 23 32 23

Indoor Operation Range

Minimum 16 11 16 11

Maximum 46 26 46 26

Outdoor Operation Range

Minimum 5 4 16 11

Page 11

3. Location of Controls and Components

3.1 Indoor Unit

3.2 Outdoor Unit

3.3 Remote Control

Page 12

4. Dimensions

4.1 Indoor Unit

4.1.1 CS-S9NKR CS-S12NKR

Page 13

4.1.2 CS-S18NKR CS-S24NKR CS-S28NKR

Page 14

4.2 Outdoor Unit

4.2.1 CU-S9NKR CU-S12NKR

4.2.2 CU-S18NKR CU-S24NKR CU-S28NKR

Page 15

5. Refrigeration Cycle Diagram

5.1 CS-S9NKR CU-S9NKR CS-S12NKR CU-S12NKR

Page 16

5.2 CS-S18NKR CU-S18NKR CS-S24NKR CU-S24NKR

CS-S28NKR CU-S28NKR

Page 17

6. Block Diagram

6.1 CS-S9NKR CU-S9NKR CS-S12NKR CU-S12NKR

Page 18

6.2 CS-S18NKR CU-S18NKR

Page 19

6.3 CS-S24NKR CU-S24NKR

Page 20

6.4 CS-S28NKR CU-S28NKR

Page 21

7. Wiring Connection Diagram

7.1 Indoor Unit

7.1.1 CS-S9NKR CS-S12NKR

Page 22

7.1.2 CS-S18NKR CS-S24NKR CS-S28NKR

Page 23

7.2 Outdoor Unit

7.2.1 CU-S9NKR CU-S12NKR

SINGLE PHASE

POWER SUPPLY

TO INDOOR UNIT

(BLACK) (WHITE) (RED) (GREEN)

YLW/

GRN

AC-BLK

(BLK)

FG1

(GRN)

RAT2

(GRY)

RAT1

(GRY)

FG2

(GRN)

FUSE103

(20A 250V)

BLK

WHT

RED DATA (RED)

GRY GRY

REACTOR

AC-WHT (WHT)

FUSE104

T3.15A L 250V

FUSE101

T3.15A L 250V

FUSE3

T2A L250V

BLK

WHT

GRN

WHT

AC_GND

(GREEN)

CN-OPT

(WHITE)

YLW

GRN

TO DRED

CN-DEMAND

(YLW)

CN-DEMAND

(WHITE)

ELECTRONIC CONTROLLER

(MAIN)

ELECTRONIC CONTROLLER

(DEMAND CONTROL)

BLK

WHT

CN-PWR (RED)

ORG

RED

BRW

112

BLU

RED

YLW

FM1 (BLU)

FM2 (RED)

FM3 (YLW)

456

WHT

GROUNDING

TERMINAL

GROUNDING

TERMINAL

NOISE FILTER

CIRCUIT

PFC

CIRCUIT

RECTIFICATION

CIRCUIT

RECTIFICATION

CIRCUIT

FAN MOTOR

CIRCUIT

COMMUNICATION

CIRCUIT

RECTIFICATION

CIRCUIT

SWITCHING

POWER SUPPLY

CIRCUIT

TERMINAL

BOARD

TERMINAL

BOARD

(BLACK)

(WHITE)

(RED)

COMPRESSOR TERMINAL

THE PARENTHESIZED LETTERS IS

INDICATED ON TERMINAL COVER.

(TRADEMARK)

RED

BLU

YLW

COMPRESSOR

OUTDOOR AIR TEMP.

SENSOR (THERMISTOR)

123

(RED)

(BLU)

(YLW)

BLUE (BLU)

RED (RED)

PIPING TEMP.

SENSOR (THERMISTOR)

COMPRESSOR TEMP.

SENSOR (THERMISTOR)

FAN

MOTOR

CN-TH1

(WHT)

CN-TANK

(WHT)

YELLOW (YLW)

REMARKS;

BLACK; (BLK) BLUE; (BLU)

WHITE; (WHT) RED; (RED)

YELLOW; (YLW) GRAY; (GRY)

GREEN; (GRN) BROWN; (BRW)

ORANGE; (ORG)

YELLOW/GREEN; (YLW/GRN)

Resistance of Compressor Windings

CONNECTION

U-V

V-W

U-W

5RS092XCD21 ()

1.152

Page 24

7.2.2 CU-S18NKR

Q10

RED

BLU

YLW

COMPRESSOR

(RED) U

(BLU) V

(YLW) W

RED

BLU

YLW

POWER SUPPLY

TO INDOOR UNIT

(BLACK) (WHITE) (RED) (GREEN)

YLW/

GRN

YLW/GRN

AC-BLK

(BLK)

FG01

(GRN)

L2-1

(GRAY)

L2-0

(GRAY)

FUSE3

(20A 250V)

BLK

WHT

RED COM3 (RED)

GRY GRY

REACTOR

AC-WHT (WHT)

FUSE2

T3.15A L 250V

FUSE3

T2A L250V

BLK

WHT

GRN

AC_GND

(GREEN)

CN-OPT

(WHITE)

YLW

GRN

TO DRED

CN-DEMAND

(YLW)

CN-DEMAND

(WHITE)

ELECTRONIC CONTROLLER

(MAIN)

ELECTRONIC CONTROLLER

(DEMAND CONTROL)

BLK

WHT

CN-PWR (RED)

ORG

RED

BRW

113

61 1214

RECTIFICATION

CIRCUIT

TERMINAL

BOARD

TERMINAL

BOARD

(BLACK)

(WHITE)

(RED)

COMPRESSOR TERMINAL

THE PARENTHESIZED LETTERS IS

INDICATED ON TERMINAL COVER.

(TRADEMARK)

BLUE (BLU)

RED (RED)

ELECTRO-MAGNETIC COIL

(EXPANSION VALVE)

CN-EV

(WHT)

CN-ACFM

(WHT)

YELLOW (YLW)

REMARKS;

BLACK; (BLK) BLUE; (BLU)

WHITE; (WHT) RED; (RED)

YELLOW; (YLW) GRAY; (GRY)

GREEN; (GRN) BROWN; (BRW)

ORANGE; (ORG)

YELLOW/GREEN; (YLW/GRN)

Resistance of Compres sor Windings

CONNECTI ON

U-V

V-W

U-W

5RD132XFA21 ()

1.152

WHT

t t t

OUTDOOR AIR TEMP.

SENSOR (THERMISTOR)

PIPING TEMP.

SENSOR (THERMISTOR)

DISCHARGE TEMP.

SENSOR (THERMISTOR)

CN-TH1

(WHT)

CN-DIS

(WHT)

FM CAPACITOR

(460V 3.0µF)

BLU

YLW

ORG

RED

FAN

MOTOR

135

NOISE

FILTER

CIRCUIT

COMMUNICATION

CIRCUIT

SWITCHING

POWER SUPPLY

CIRCUIT

RECTIFICATION

CIRCUIT

PFC

CIRCUIT

RECTIFICATION

CIRCUIT

FAN MOTOR

CIRCUIT

Page 25

7.2.3 CU-S24NKR

Page 26

7.2.4 CU-S28NKR

Page 27

8. Electronic Circuit Diagram

8.1 Indoor Unit

8.1.1 CS-S9NKR CS-S12NKR

Page 28

8.1.2 CS-S18NKR CS-S24NKR CS-S28NKR

Page 29

8.2 Outdoor Unit

8.2.1 CU-S9NKR CU-S12NKR

Page 30

8.2.2 CU-S18NKR

Page 31

8.2.3 CU-S24NKR

Page 32

8.2.4 CU-S28NKR

Page 33

9. Printed Circuit Board

9.1 Indoor Unit

9.1.1 Main Printed Circuit Board

9.1.1.1 CS-S9NKR CS-S12NKR

Page 34

9.1.1.2 CS-S18NKR CS-S24NKR CS-S28NKR

9.1.2 Indicator Printed Circuit Board

Page 35

9.2 Outdoor Unit

9.2.1 Main Printed Circuit Board

9.2.1.1 CU-S9NKR CU-S12NKR

Page 36

CN-DEMAND

AC-GND

CN-PW

Page 37

9.2.2 CU-S18NKR

Page 38

9.2.3 CU-S24NKR CU-S28NKR

Page 39

10. Installation Instruction

10.1 Select The Best Location

10.1.1 Indoor Unit

• Do not install the unit in excessive oil fume area such as kitchen, workshop and etc.

• 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 2.5m.

10.1.2 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 the [piping length for additional gas], additional refrigerant should be added as shown in

the table.

Example: For S9***

If the unit is installed at 10 m distance, the quantity of additional refrigerant should be 38 g .... (10-7.5) m × 15 g/m =

38 g.

10.1.3 Indoor/Outdoor Unit Installation Diagram

Piping size

Model

Horse

Power

(HP)

Gas Liquid

Std. Length

(m)

Max. Elevation

(m)

Min. Piping Length (m)

Max. Piping

Length (m)

Additional

Refrigerant

(g/m)

Piping length

for add. gas

(m)

S9*** 1.0HP

9.52 mm (3/8")

15 3 15 15 7.5

S12*** 1.5HP

7.5 15 3 15 15 7.5

S18*** 2.0HP

12.7 mm (1/2")

15 3 20 20 10 S24*** 2.5HP 20 3 30 30 10 S28*** 3.0HP

15.88 mm (5/8")

6.35 mm (1/4")

20 3 30 30 10

Page 40

10.2 Indoor Unit

10.2.1 How to Fix Installation Plate

The mounting wall shall be strong and solid enough to prevent if from the vibration.

Dimension

Model

○

○2 ○3 ○4 ○5 ○6

S9***, S12***

490 mm 82 mm 439 mm 432 mm 43 mm 95 mm

S18***, S24***, S28***

590 mm 82 mm 539 mm 532 mm 169 mm 219 mm

The centre of installation plate should be at more than

○

1 at right and left of the wall.

The distance from installation plate edge to ceiling should more than

○

From installation plate left edge to unit’s left side is

○

From installation plate right edge to unit’s right is

○

B : For left side piping, piping connection for liquid should be about ○5 from this line.

: For left side piping, piping connection for gas should be about

○

6 from this line.

1 Mount the installation plate on the wall with 5 screws or more (at least 5 screws).

(If mounting the unit on the concrete wall, consider using anchor bolts.) o 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 ø70mm hole-core drill.

o Line according to the left and right side of the installation plate. The meeting point of the extended line is

the center of the hole. Another method is by putting measuring tape at position as shown in the diagram above. The hole center is obtained by measuring the distance namely 128 mm for left and right hole respectively.

o Drill the piping hole at either the right or left and the hole should be slightly slanting to the outdoor side.

10.2.2 To Drill a Hole in the Wall and Install a Sleeve of Piping

1 Insert the piping sleeve to the hole. 2 Fix the busing to the sleeve. 3 Cut the sleeve until it extrudes about 15 mm

from the wall.

4 Finish by sealing the sleeve with putty or

caulking compound at the final stage.

Page 41

10.2.3 Indoor Unit Installation

10.2.3.1 For the right rear piping

10.2.3.2 For the right and right bottom piping

10.2.3.3 For the embedded piping

(This can be used for left rear piping and bottom piping also.)

Page 42

Page 43

10.2.4 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 4 ×

1.5 mm

flexible cord, type designation 245 IEC 57 or heavier cord.

3 Bind all the indoor and outdoor connecting cable with tape and route the connecting cable via the

escapement.

4 Remove the tapes and connect the connecting cable between indoor unit and outdoor unit according to the

diagram below.

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

o Ensure the colour of wires of outdoor unit and terminal Nos. are the same to the indoor's repectively. o Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason.

10.2.4.1 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 are 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.

Page 44

10.3 Outdoor Unit

10.3.1 Install the Outdoor Unit

• After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram. 1 Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10mm). 2 When installing at roof, please consider strong wind and earthquake. Please fasten the installation stand

firmly with bolt or nails.

Model A B C D S9***, S12*** 540 mm 160 mm 18.5 mm 330 mm S18***, S24***, S28***

613 mm 131 mm 16 mm 360.5 mm

10.3.2 Connect the Piping

10.3.2.1 Connecting the piping to indoor

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.

10.3.2.2 Connecting the piping to

outdoor

Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valve and then tighten with torque wrench to the specified torque as stated in the table.

Do not overtighten, overtightening may cause gas leakage

Piping size Torque

6.35 mm (1/4”) [18 N•m (1.8 kgf.m)]

9.52 mm (3/8”) [42 N•m (4.3 kgf.m)]

12.7 mm (1/2”) [55 N•m (5.6 kgf.m)]

15.88 mm (5/8”) [65 N•m (6.6 kgf.m)]

19.05 mm (3/4”) [100 N•m (10.2 kgf.m)]

Page 45

10.3.3 Evacuation of the equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following 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. o 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. 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 (-0.1Mpa). Then evacuate the air 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.

Note: BE SURE TO TAKE 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 18Nym 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.

o Be sure to check for gas leakage.

Page 46

10.3.4 Connect the Cable to the Outdoor Unit

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

2. Cable connection to the power supply through Isolating Devices (Disconnecting means).

o Connect approved type polychloroprene sheathed power supply cord 3 × 1.5 mm

(1.0 ~ 1.5HP), 3 ×

2.5 mm

(2.0 ~ 2.5HP) or 3 × 4.0 mm2 (3.0HP) type designation 245 IEC 57 or heavier cord to the

terminal board, and connect the others end of the cord to Isolating Devices (Disconnecting means).

3. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 × 1.5 mm

flexible cord, type designation 245 IEC 57 or heavier cord.

4. Connecting cable between outdoor unit and DRED (Demand response enabling devices) shall be double insulation layer, polychloroprene sheathed (>50V) with size 4 × (0.5 mm

to 2.0 mm2) cable or flexible cord,

where the maximum allowable length is 30m.

5. Connect the power supply cord and connecting cable between indoor unit and outdoor unit according to the diagram below.

6. Secure the power supply cord and connecting cable onto the control board with the holder.

7. Attach the control board cover back to the original position with screw.

8. For wire stripping and connection requirement, refer to instruction g of indoor unit.

o Note: Isolating Devices (Disconnecting means) should have minimum 3.0 mm contact gap. o Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason. o Always ensure all above connections compliant with national wire rules.

Page 47

10.3.5 Piping 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.

Page 48

11. Operation Control

11.1 Basic Function

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air temperature.

11.1.1 Internal Setting Temperature

Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting processes. These shifting processes are depending on the air conditioner settings and the operation environment. The final shifted value will be used as internal setting temperature and it is updated continuously whenever the electrical power is supplied to the unit.

11.1.2 Cooling Operation

11.1.2.1 Thermostat control

• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5°C continue for 3 minutes.

• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >

Compressor OFF point.

11.1.3 Soft Dry Operation

11.1.3.1 Thermostat control

• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -2.0°C continue for 3 minutes.

• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >

Compressor OFF point.

Page 49

11.1.3.2 Automatic Operation

• This mode can be set using remote control and the operation is decided by remote control setting temperature, remote control operation mode and indoor intake air temperature.

• During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the indoor intake air temperature.

• Every 10 minutes, the indoor temperature is judged.

• For the 1st judgment

o If indoor intake temperature - remote control setting temperature  2°C, COOL mode is decided. o If -2°C  indoor intake temperature - remote control setting temperature < 2°C, DRY mode is decided.

• For the 2nd judgment onwards

o If indoor intake temperature - remote control setting temperature  3°C, if previous operate in DRY mode,

then continue in DRY mode. Otherwise COOL mode is decided.

o If -2°C  indoor intake temperature - remote control setting temperature < 3°C, maintain with previous mode.

11.1.3.3 Fan Operation

• Fan operation is used to circulate air in the room.

• During operation, indoor fan run continuously but outdoor fan and compressor stop.

• Temperature setting is not applicable.

11.2 Indoor Fan Motor Operation

A. Basic Rotation Speed (rpm)

• Manual Fan Speed [Cooling, Dry] o Fan motor’s number of rotation is determined according to remote control setting.

Remote control     

Tab Hi Me+ Me Me- Lo

• Auto Fan Speed [Cooling, Dry]

o According to room temperature and setting temperature, indoor fan speed is determined automatically. o The indoor fan will operate according to pattern below.

Page 50

B. Feedback control

• Immediately after the fan motor is started, feedback control is performed once every second.

• During fan motor on, if fan motor feedback  2550 rpm or < 50 rpm continue for 10 seconds, the fan motor error

counter increased, fan motor is then stop and restart. If the fan motor counter becomes 7 times, then H19 - fan motor error is detected. Operation stops and cannot on back.

11.3 Outdoor Fan Motor Operation

Outdoor fan motor is operated with one fan speed only. It starts when compressor starts operation and it stops 30 seconds after compressor stops operation.

11.4 Airflow Direction

• There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by vertical vanes).

• Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using remote control).

11.4.1 Vertical Airflow

Vane Angle (°)

Operation Mode Airflow Direction

1 2 3 4 5

Auto 20 ~ 45

Cooling and Ion

Manual 20 26 32 37 45

Auto 20 ~ 45

Soft Dry

Manual 20 26 32 37 45

• Automatic vertical airflow direction can be set using remote control; the vane swings up and down within the angles as stated above. When the air conditioner is stopped using remote control, the vane will shift to close position.

• Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated above and the positions of the vane are as Figure 2 below. When the air conditioner is stopped using remote control, the vane will shift to close position.

Page 51

11.4.2 Horizontal Airflow

• Automatic horizontal airflow direction can be set using remote control; the vane swings left and right within the angles as stated below.

Operation Mode Vane angle (°)

Cooling and Soft dry 68 ~ 112

• Manual horizontal airflow direction can be set using remote control; the angles of the vane are as stated below and the positions of the vane are as Figure 2 above:

Pattern 1 2 3 4 5

Airflow Direction

Patterns at Remote

Control

Vane Angle (°) 90 68 78 102 112

11.5 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode)

• Purpose

o To provide quiet cooling operation compare to normal operation.

• Control condition

o Quiet operation start condition

 When “QUIET” button at remote control is pressed twice.

QUIET/ECONOMY LED illuminates (low intensity).

o Quiet operation stop condition

 When one of the following conditions is satisfied, quiet operation stops:

• QUIET button is pressed again.

• Stop by OFF/ON switch.

• Timer “off” activates.

 When quiet operation is stopped, operation is shifted to normal operation with previous setting.  When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.  When operation mode is changed, quiet operation is shifted to quiet operation of the new mode.  During quiet operation, if timer “on” activates, quiet operation maintains.  After off, when on back, quiet operation is not memorised.

• Control contents

o Fan speed is changed from normal setting to quiet setting of respective fan speed.

This is to reduce sound of Hi, Me, Lo for 3dB (some models more than 3dB).

o Fan speed for quiet operation is reduced from setting fan speed. o Outdoor fan speed is change to QLo (S24NKR & S28NKR). o Compressor frequency reduced.

Page 52

11.6 Powerful Mode Operation

• When the powerful mode is selected, the internal setting temperature will shift lower up to 2°C (for Cooling/Soft Dry) than remote control setting temperature for 20 minutes to achieve the setting temperature quickly.

• Powerful operation stops condition o When one of the following condition is satisfied, powerful operation stops:

 Quiet button is pressed.  Stop by OFF/ON button.  OFF Timer activates.  Powerful button is pressed again.  Powerful operation continue for 20 minutes.

11.7 Economy Mode Operation

• This operation is use to reduce electrical power consumption by adjusting the set temperature.

• Economy operation starts when the Economy button is pressed during cooling or dry operation.

• During Cooling/Dry economy operation, target setting temperature will be adjusted by +2°C. Internal setting

temperature limit shift to maximum 35°C (maximum 33°C + 2°C Economy shift).

• During Economy operation, all indicators includes Economy indicator will be dimmed. The brightness level is equivalent to indicator dim function.

• Powerful, Quiet and Economy could not be operated at the same time. The unit will follow the latest setting of these three operations.

• The Economy operation stops when: 1 Operation OFF. 2 Received Economy signal from remote control again. 3 Received either Powerful or Quiet operation signal from remote control.

11.8 Timer Control

• There are 2 sets of ON and OFF timer is available to turn the unit ON or OFF at different preset time.

• If more than one timer had been set, the upcoming timer will be displayed and will activate in sequence.

11.8.1 ON Timer Control

• ON timer 1 and ON timer 2 can be set using remote control, the unit with timer set will start operate earlier than the setting time. This is to provide a comfortable environment when reaching the set ON time.

• 60 minutes before the set time, indoor (at fan speed of Lo-) and outdoor fan motor start operate for 30 seconds to determine the indoor intake air temperature and outdoor air temperature in order to judge the operation starting time.

• From the above judgment, the decided operation will start operate earlier than the set time as shown below.

11.8.2 OFF Timer Control

• OFF Timer 1 and OFF Timer 2 can be set using remote control, the unit with timer set will stop at set time.

Page 53

11.9 Auto Restart Control

• When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be selected randomly) after power supply resumes.

• This type of control is not applicable during ON/OFF Timer setting.

• This control can be omitted by open the circuit of JP1 at indoor unit printed circuit board.

11.10 Indication Panel

LED POWER TIMER QUIET/ECONOMY POWERFUL

Color Green Orange Orange Orange

Light ON Operation ON Timer Setting ON Quiet/Economy Mode ON Powerful Mode ON

Light OFF Operation OFF Timer Setting OFF Quiet/Economy Mode OFF Powerful Mode OFF

Note:

• If POWER LED is blinking, the possible operations of the unit are Hot Start, during Deice operation, operation mode judgment, or ON timer sampling.

• If TIMER LED blinking, there is an abnormality operation occurs.

Page 54

12. Protection Control

12.1 Protection Control For All Operations

12.1.1 Restart Control (Time Delay Safety Control)

• The Compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on again by pressing OFF/ON button at remote control within this period.

• This control is not applicable if the power supply is cut off and on again.

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

12.1.2 Total Running Current Control

• When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor operation will be decreased.

• If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.

• However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3

minutes.

Model S9NKR S12NKR S18NKR S24NKR S28NKR

A 5.41 6.57 6.57 12.48 12.64

B 5.03 6.13 6.13 12.48 12.14

Cooling/Soft Dry (X)

C 5.03 6.13 6.13 11.46 11.10

Y 15.00 15.00 15.00 19.00 19.00

• The first 30 minutes of cooling operation, (A) will be applied.

12.1.3 IPM (Power Transistor) Prevention Control

• Overheating Prevention Control

o When the IPM temperature rises to 120°C, compressor operation will stop immediately. o Compressor operation restarts after 3 minutes the temperature decreases to 110°C or 95°C (S24, 28NK). o If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).

• DC Peak Current Control

o When electric current to IPM exceeds set value of 18.5A (S9, 12NK) and 30.0 ± 5.0A (S18NK, S24NK,

S28NK), the compressor will stop operate. Then, operation will restart after 3 minutes.

o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will

restart after 1 minute.

o If the set value exceeded again within 30 seconds after the compressor starts, the operation will restart after

1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off, timer LED will be blinking (“F99” is indicated).

Page 55

12.1.4 Compressor Overheating Prevention Control

• Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below.

• If compressor discharge temperature exceeds 107°C, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking. (“F97” is indicated.)

107°C

92°C

Comp. temperature (Comp. Discharge temperature

Compressor = OFF

103°C

(105°C)

91°C

100°C

(95°C)

90°C (85°C)

Compressor Frequency

Maintain

Compressor Frequency

Reduce

Free

103°C

88°C

Comp. temperature (Comp. Discharge temperature

Compressor = OFF

99°C

87°C

96°C

86°C

Compressor Frequency

Maintain

Compressor Frequency

Reduce

Free

(S9, 12, 18NKR) (S24, 28NKR)

12.1.5 Low Pressure Prevention Control (Gas Leakage Detection)

• Control start conditions

o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A

(S9, 12NK), 1.38A and 1.65A (S18NK).

o During Cooling and Soft Dry operation:

Indoor suction temperature – indoor piping temperature is below 4°C

• Control contents

o Compressor stops (and restart after 3 minutes). o If the conditions above happen 2 times within 20 minutes, the unit will:

 Stop operation  Timer LED blinks and “F91” indicated.

12.1.6 Low Frequency Protection Control 1

• When the compressor operates at frequency lower than 24 Hz continued for 20 minutes, the operation frequency will be changed to 23 Hz for 2 minutes.

12.1.7 Low Frequency Protection Control 2

• When all below conditions comply, the compressor frequency will changed to lower frequency.

Temperature, T, for: Cooling / Soft Dry

Indoor intake air (°C) T < 14 or T  30

Outdoor air (°C) T < 13 or T  38

Indoor heat exchanger (°C) T < 30

Page 56

12.2 Protection Control For Cooling & Soft Dry Operation

12.2.1 Outdoor Air Temperature Control

• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.

• This control will begin 1 minute after the compressor starts.

• Compressor frequency will adjust base on outdoor air temperature.

•

12.2.2 Cooling Overload Control

• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency).

• The compressor stops if outdoor pipe temperature exceeds 61°C (S9, 12NK), 63°C (S18NK) and 65°C (S24, 28NK).

• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise protection).

12.2.3 Freeze Prevention Control 1

• When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop operating.

• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.

• At the same time, indoor fan speed will be higher than during its normal operation.

• If indoor heat exchanger temperature is higher than 5°C for 5 minutes, the fan speed will return to its normal

operation.

12.2.4 Freeze Prevention Control 2

• Control start conditions

o During Cooling operation and soft dry operation

 During thermo OFF condition, indoor intake temperature is less than 10°C or  Compressor stops for freeze prevention control

o Either one of the conditions above occurs 5 times in 60 minutes.

• Control contents

o Operation stops o Timer LED blinks and “H99” indicated

12.2.5 Dew Prevention Control 1

• To prevent dew formation at indoor unit discharge area.

• This control will be activated if:

o Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled. o When Cooling or Dry mode is operated more than 20 minutes or more.

• This control stopped if:

o Compressor stopped. o Remote control setting changed (fan speed / temperature). o Outdoor air temperature and indoor intake temperature changed.

• Fan speed will be adjusted accordingly in this control.

Page 57

12.2.6 Odor Cut Control

• To reduce the odor released from the unit.

o Start Condition

 AUTO FAN Speed is selected during COOL or DRY operation.  During freeze prevention control and timer preliminary operation, this control is not applicable.

o Control content

 Depends on compressor conditions:

1. Compressor OFF  Compressor ON. The indoor unit fan stops temporarily and then starts to blow at minimum airflow for 30 seconds.

2. Compressor ON  Compressor OFF. The indoor unit fan stops for 90 seconds and then blows at minimum airflow for 20 seconds.

12.2.7 Demand Control

• When the air-conditioner connected to Demand Response Enabling Devices (DRED), the power consumption especially during peak hours could be controlled.

DRM1

Relay 1

DRED AIR CONDITIONER

DRM2

Relay 2

DRM3

Relay 3

COM

• Three Demand response modes (DRM) are available

o DRM1 = Compressor cut off o DRM2 = Operate at 50% of rated input power o DRM3 = Operate at 75% of rated input power

• During DRM

, the Power Indicator blinks (3 seconds ON and 0.5 seconds OFF) to indicate the compressor cut

off status.

12.2.8 Pump down Operation by CN-S

• A convenience method to activate pump down operation.

• Control start condition:

o During power standby condition, short CN-S continuously between 1 second and 10 seconds.

• Control stop condition:

o 480 seconds after pump down operation starts. o CN-S is shorted again during pump down operation.

Page 58

13. Servicing Mode

13.1 Auto Off/On Button

Auto OFF/ON

Button Pressed

Auto OFF/ON

Button Pressed

5 sec

Auto Operation Test Run Operation

(Forced Cooling Operation)

Stop

1 AUTO OPERATION MODE

The Auto Operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to operate air conditioner with limited function if remote control is misplaced or malfunction.

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

The Test Run Operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds. A “beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation.

The Auto OFF/ON button may be used together with remote control to set / change the advance setting of air conditioner operation.

3 REMOTE CONTROL NUMBER SWITCH MODE

The Remote Control Number Switch Mode will be activated if the Auto OFF/ON button is pressed continuously for more than 11 seconds (3 “beep” sounds will occur at 11

seconds to identify the Remote Control Number Switch Mode is in standby condition), press “AC Reset” button and then press any button at remote control to transmit and store the desired transmission code to the EEPROM.

There are 4 types of remote control transmission code could be selected. The indoor unit will only operate when received signal with same transmission code from remote control. This could prevent signal interference when there are 2 or more units 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

Jumper A (J-A) Jumper B (J-B) Remote Control No.

Short Open A (Default)

Open Open B

Short Short C

J-A

J-B

Open Short D

4 REMOTE CONTROL RECEIVING SOUND OFF/ON MODE

The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed continuously for more than 16 seconds (4 “beep” sounds will occur at 16

seconds to identify the Remote Control Receiving Sound OFF/ON Mode is in standby condition) and press “AC Reset” button and then press “Check” button at remote control.

Press Auto OFF/ON button to toggle remote control receiving sound.

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

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

After Auto OFF/ON button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is restarted.

Auto Operation

Test Run Operation

(Forced Cooling Operation)

Remote Control Number

Switch Mode

Remote Control Receiving

Sound OFF/ON

Beep Beep x 2 Beep x 3 Beep x 4

5 sec 8 sec 11 sec 16 sec

Main unit always continue Test Run (forced cooling) operation.

Press “AC Reset”, then

any key at remote control

Press “AC Reset”, then

“Check” at remote control

Page 59

13.2 Remote Control Button

13.2.1 SET Button

• To limit set temperature range for COOL mode.

o Set temperature range selection

13.2.2 CLOCK Button

• To change the remote control time format:

o Press for more than 5 seconds

13.2.3 RESET (RC) Button

• To clear and restore the remote control setting to factory default.

o Press once to clear the memory

13.2.4 RESET (AC) Button

• To restore the unit’s setting to factory default.

o Press once to restore the unit’s setting

13.2.5 TIMER ▲

• To change indoor unit indicators’ intensity:

o Press continuously for 5 seconds.

13.2.6 TIMER ▼

• To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F)

o Press continuously for 10 seconds.

Page 60

14. Troubleshooting Guide

14.1 Refrigeration Cycle System

In order to diagnose malfunctions, ensure the air conditioner is free from 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 to the right.

Normal Pressure and Outlet Air Temperature (Standard)

Gas Pressure

Mpa

(kg/cm

Outlet air

Temperature

(°C)

Cooling Mode 0.9 ~ 1.2 (9 ~ 12) 12 ~ 16

Condition: Indoor fan speed = High

Outdoor temperature = 35°C at cooling mode. Compressor operate at rated frequency

Different in the intake

and outlet

air temperatures

Normal

Value of electric current

during operation

Dusty condenser

preventing heat radiation

Excessive amount

of refrigerant

Gas side pressure

Inefficient compressor

Insufficient refrigerant

Clogged strainer or

capillary cube

•

Measuring the air

temperature different

•

Measuring electric current

during operation

•

Measuring gas side

pressure

More than 8°C

(15 minutes after an

operation is started) at

cooling mode.

Less than 8°C at the cooling mode

Higher than specified

Cooling

Mode

High

Low

Lower than specified

Page 61

14.1.1 Relationship between the condition of the air conditioner and pressure and electric current

Cooling Mode

Condition of the

air conditioner

Low Pressure High Pressure Electric current during operation

Insufficient refrigerant

(gas leakage)

Ô Ô Ô

Clogged capillary tube or

strainer

Ô Ô Ô

Short circuit in the indoor unit

Ô Ô Ô

Heat radiation deficiency

of the outdoor unit

Ò Ò Ò

Inefficient compression

Ò Ô Ô

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

Page 62

14.2 Breakdown Self Diagnosis Function

14.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)

• Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.

• Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown

condition, the LED will ON again.

• In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored in IC memory.

14.2.2 To Make a Diagnosis

1 Timer LED starts to blink and the unit automatically stops the operation. 2 Press the CHECK button on the remote control continuously for 5 seconds. 3 “- -“ will be displayed on the remote control display.

Note: Display only for “- -“ (No signal transmission, no receiving sound and no Power LED blinking)

4 Press the TIMER  or  button on the remote control. The code “H00” (no abnormality) will be displayed

and signal will be transmit to the main unit.

5 Each press of the button ( or ) will increase error code

number and transmit error code signal to the main unit.

6 When the latest abnormality code on the main unit and

code transmitted from the remote control are matched, Power LED will light up for 30 seconds and a “beep” sound (continuously for 4 seconds) will be heard. If no codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.

7 The breakdown diagnosis mode will be canceled unless

pressing the CHECK button continuously for 5 seconds or operating the unit for 30 seconds.

8 The LED will be off if the unit is turned off or the RESET

button on the main unit is pressed.

14.2.3 To Display Memorized Error Code

(Protective Operation)

1 Turn power on. 2 Press the CHECK button on the remote control 3 “- -“ will be displayed on the remote control display.

Note: Display only for “- -“ (No signal transmission, no receiving sound and no Power LED blinking)

4 Press the TIMER  or  button on the remote control. The code “H00” (no abnormality) will be displayed

and signal will be transmit to the main unit.

5 Each press of the button ( or ) will increase error code number and transmit error code signal to the main

unit.

6 When the latest abnormality code on the main unit and code transmitted from the remote control are matched,

Power LED will light up for 30 seconds and a “beep” sound (continuously for 4 seconds) will be heard. If no codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.

7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5

seconds or operating the unit for 30 seconds.

8 The same diagnosis can be repeated by turning power on again.

14.2.4 To Clear Memorized Error Code after Repair (Protective Operation)

1 Turn power on (in standby condition). 2 Press the AUTO button for 5 seconds (a “beep” sound is heard) on the main unit to operate the unit at

Forced Cooling Operation Mode.

3 Press the CHECK button on the remote control for about 1 second with a pointed object to transmit signal to

main unit. A “beep” sound is heard, and the Error Code is cleared.

14.2.5 Temporary Operation (Depending On Breakdown Status)

1 Press the Auto OFF/ON button on the main unit (a “beep” sound is heard) to operate the unit. (Remote

control is enable again).

2 The unit can be temporarily be used until repaired.

Error Code Operation Temporary items

H23 Cooling

H27, H28 Cooling

Emergency Operation

with limited power

Page 63

14.3 Error Code Table

Diagnosis

display

Abnormality / Protection control Abnormality Judgment

Emergency

Operation

Primary location to verify

H00 No abnormality detected - Normal operation

H11

Indoor / Outdoor abnormal communication

> 1 min after starting

operation

Indoor fan operation

only

• Internal / external cable connection

• Indoor / outdoor PCB

H12 Connection capability rank abnormality

Continuously for 90 sec

after power supplied

- -

H14

Indoor intake air temperature sensor abnormality

Continue for 5 sec. -

• Intake air temperature sensor (defective or disconnected)

H15

Outdoor compressor temperature sensor abnormality

Continue for 5 sec. -

• Compressor temperature sensor (defective or disconnected)

H16 Outdoor current transformer open circuit - -

• Outdoor PCB

• IPM (Power transistor) module

H19 Indoor fan motor mechanism locked

7 occurrences

continuously

• Indoor PCB

• Fan motor

H23

Indoor heat exchanger temperature sensor abnormality

Continue for 5 sec.



• Heat exchanger temperature sensor (defective or disconnected)

H25 e-ion abnormality -



• Indoor PCB

• e-ion PCB

H27

Outdoor air temperature sensor abnormality

Continue for 5 sec.



• Outdoor temperature sensor (defective or disconnected)

H28

Outdoor heat exchanger temperature sensor abnormality

Continue for 5 sec.



• Outdoor heat exchanger temperature sensor (defective or disconnected)

H30

Discharge temperature sensor abnormality

Continue for 5 sec.

• Outdoor discharge temperature sensor (defective or disconnected)

H33 Indoor / outdoor wrong connection - -

• Indoor / outdoor supply voltage

H38 Indoor / outdoor mismatch (brand code) - - -

H58 Gas sensor abnormality Continue for 6 hours



•

Gas sensor

(defective or disconnected)

H59

Eco Patrol sensor abnormality

Continue for 70 sec.



•

Eco Patrol sensor (defective or

disconnected)

•

Eco Patrol PCB

H97

Outdoor fan lock abnormality

2 occurrences within 30

minutes

•

Outdoor fan motor locked

H98 Indoor temperature rise abnormality - -

•

Air filter dirty

•

Air circulation short circuit

H99

Indoor heat exchanger freeze prevention protection

- -

•

Insufficient refrigerant

•

Air filter dirty

F11 4 way valve switching failure *

4 occurrences within 30

minutes

•

4-way valve

•

v-coil

F90

System and compressor microcomputer communication error(for S10*** only)

2 occurrences within 5

seconds

•

Compressor

•

Outdoor PCB

F90 Power factor correction abnormality

4 occurrences within 20

minutes

•

Outdoor PCB

F91 Refrigerant cycle abnormal

2 occurrences within 20

minutes

•

No refrigerant ( 3-way valve is

closed)

F93 Outdoor compressor abnormal revolution

4 occurrences within 20

minutes

•

Outdoor compressor

F95 Cooling high pressure protection

4 occurrences within 20

minutes

•

Outdoor refrigerant circuit

F96

Intelligent power transistor overheating protection

- -

•

Excess refrigerant

•

Improper heat radiation

•

IPM (Power transistor)

F97

Compressor temperature rise protection control

4 times occurrence within

20 minutes

•

Insufficient refrigerant

•

Compressor

F98 Total running current protection

3 times occurrence within

20 minutes

•

Excess refrigerant

•

Improper heat radiation

F99

Outdoor direct current (DC) peak detection

7 times occurrence

continuously

•

Outdoor PCB

•

IPM (Power transistor)

•

Compressor

Note: “” – Frequency measured and fan speed fixed “ * ”– For cooling only model, it is the indication when indoor heat exchanger sensor or indoor air intake sensor has abnormality.

The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard following by pressing the CHECK button at remote control. Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Code Table) by using remote control or Auto OFF/ON button at indoor unit. However, the remote control signal receiving sound is changed from one “beep” to four “beep” sounds.

Page 64

14.4 Troubleshooting Flowchart

14.4.1 H11 (Indoor/Outdoor Abnormal Communication)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal.

Malfunction Caused

• Faulty indoor unit PCB.

• Faulty outdoor unit PCB.

• Indoor unit-outdoor unit signal transmission error due to wrong wiring.

• Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the

indoor and outdoor units.

• Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.

Troubleshooting

Page 65

14.4.2 H12 (Indoor/Outdoor Capacity Rank Mismatched)

Malfunction Decision Conditions

• During startup, error code appears when different types of indoor and outdoor units are interconnected.

Malfunction Caused

• Wrong models interconnected.

• Wrong indoor unit or outdoor unit PCBs mounted.

• Indoor unit or outdoor unit PCBs defective.

• Indoor-outdoor unit signal transmission error due to wrong wiring.

• Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor

and outdoor units.

Troubleshooting

Page 66

14.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 67

14.4.4 H15 (Compressor Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 68

14.4.5 H16 (Outdoor Current Transformer Open Circuit)

Malfunction Decision Conditions

• A current transformer (CT) is detected by checking the compressor running frequency ( rated frequency) and

CT detected input current (less than 1.14A) for continuously 20 seconds.

Malfunction Caused

• CT defective

• Outdoor PCB defective

• Compressor defective (low compression)

Troubleshooting

Page 69

14.4.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked)

Malfunction Decision Conditions

• The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm)

Malfunction Caused

• Operation stops due to short circuit inside the fan motor winding.

• Operation stops due to breaking of wire inside the fan motor.

• Operation stops due to breaking of fan motor lead wires.

• Operation stops due to Hall IC malfunction.

• Operation error due to faulty indoor unit PCB.

Troubleshooting

Page 70

14.4.7 H23 (Indoor Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 71

14.4.8 H25 (e-ion Air Purifying System Abnormal)

Malfunction Decision Conditions

• During standby of cooling and heating operation, e-ion breakdown occurs and air conditioner stops operation.

Malfunction Caused

• Faulty indoor main PCB.

• Faulty indoor e-ion power module.

Troubleshooting

Page 72

14.4.9 H27 (Outdoor Air Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 73

14.4.10 H28 (Outdoor Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 74

14.4.11 H30 (Compressor Discharge Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

Page 75

14.4.12 H33 (Unspecified Voltage between Indoor and Outdoor)

Malfunction Decision Conditions

• The supply power is detected for its requirement by the indoor/outdoor transmission.

Malfunction Caused

• Wrong models interconnected.

• Wrong indoor unit and outdoor unit PCBs used.

• Indoor unit or outdoor unit PCB defective.

Troubleshooting

Page 76

14.4.13 H58 (Patrol Sensor Abnormality)

Malfunction Decision Conditions

• If Patrol sensor feedback is 0V or 5V continuous for 6 hours.

• Error will display only when the Patrol operation is ON.

Malfunction Caused

• Faulty connector connection.

• Faulty Patrol sensor.

Troubleshooting

Page 77

14.4.14 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked)

Malfunction Decision Conditions

• The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor.

Malfunction Caused

• Operation stops due to short circuit inside the fan motor winding.

• Operation stops due to breaking of wire inside the fan motor.

• Operation stops due to breaking of fan motor lead wires.

• Operation stops due to Hall IC malfunction.

• Operation error due to faulty outdoor unit PCB.

Troubleshooting

Page 78

14.4.15 H98 (Indoor High Pressure Protection)

Error Code will not display (no Timer LED blinking) but store in EEPROM

Malfunction Decision Conditions

• During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60°C.

Malfunction Caused

• Clogged air filter of the indoor unit

• Dust accumulation on the indoor unit heat exchanger

• Air short circuit

• Detection error due to faulty indoor pipe temperature sensor

• Detection error due to faulty indoor unit PCB

Troubleshooting

Page 79

14.4.16 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)

Malfunction Decision Conditions

• Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C)

Malfunction Caused

• Clogged air filter of the indoor unit

• Dust accumulation on the indoor unit heat exchanger

• Air short circuit

• Detection error due to faulty indoor pipe temperature sensor

• Detection error due to faulty indoor unit PCB

Troubleshooting

Page 80

14.4.17 F11 (Indoor Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• When cooling operation, when indoor pipe temperature or indoor heat exchanger temperature sensor is above 45°C.

Malfunction Caused

• Faulty connector connection.

• Faulty indoor pipe temperature sensor.

• Faulty indoor main PCB.

Troubleshooting

Page 81

14.4.18 F90 (Power Factor Correction Protection)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level.

Malfunction Caused

• DC voltage peak due to power supply surge.

• DC voltage peak due to compressor windings not uniform.

• Faulty outdoor PCB.

Troubleshooting

Page 82

14.4.19 F91 (Refrigeration Cycle Abnormality)

Malfunction Decision Conditions

• During cooling, compressor frequency = Fcmax.

• During cooling and heating operation, running current: 0.65A < I < 1.65A.

• During cooling, indoor intake - indoor pipe < 4°C.

Malfunction Caused

• Refrigerant shortage (refrigerant leakage)

• Poor compression performance of compressor.

• 2/3 way valve closed.

• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.

Troubleshooting

Page 83

14.4.20 F93 (Compressor Rotation Failure)

Malfunction Decision Conditions

A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Caused

• Compressor terminal disconnect

• Outdoor PCB malfunction

Troubleshooting

Page 84

14.4.21 F95 (Cooling High Pressure Abnormality)

Malfunction Decision Conditions

During operation of cooling, when outdoor unit heat exchanger high temperature data (61°C) is detected by the outdoor pipe temperature sensor.

Malfunction Caused

• Outdoor pipe temperature rise due to short circuit of hot discharge air flow.

• Outdoor pipe temperature rise due to defective of outdoor fan motor.

• Outdoor pipe temperature rise due to defective outdoor pipe temperature sensor.

• Outdoor pipe temperature rise due to defective outdoor unit PCB.

Troubleshooting

Page 85

14.4.22 F96 (IPM Overheating)

Malfunction Decision Conditions

During operating of cooling and heating, when IPM temperature data (100°C) is detected by the IPM temperature sensor.

Malfunction Caused

• IPM overheats due to short circuit of hot discharge air flow.

• IPM overheats due to defective of outdoor fan motor.

• IPM overheats due to defective of internal circuitry of IPM.

• IPM overheats due to defective IPM temperature sensor.

Troubleshooting

Page 86

14.4.23 F97 (Compressor Overheating)

Malfunction Decision Conditions

During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the compressor tank temperature sensor.

Malfunction Caused

• Refrigerant shortage (refrigerant leakage).

• 2/3 way valve closed.

• Detection error due to faulty compressor tank temperature sensor.

Troubleshooting

Page 87

14.4.24 F98 (Input Over Current Detection)

Malfunction Decision Conditions

During cooling and heating operation, when an input over-current (16.8A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running.

Malfunction Caused

• Over-current due to compressor failure.

• Over-current due to defective outdoor unit PCB.

• Over-current due to defective inverter main circuit electrolytic capacitor.

• Over-current due to excessive refrigerant.

Troubleshooting

Page 88

14.4.25 F99 (Output Over Current Detection)

Malfunction Decision Conditions

During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in the inverter DC peak sensing circuitry.

Malfunction Caused

• DC peak due to compressor failure.

• DC peak due to defective power transistor(s).

• DC peak due to defective outdoor unit PCB.

Troubleshooting

• Checking the power transistor

• Never touch any live parts for at least 10 minutes after turning off the circuit breaker.

• If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using

the tester.

• For the UVW, make measurement at the Faston terminal on the board of the relay connector.

Tester’s negative terminal Power transistor (+) UVW Power transistor (-) UVW

Tester’s positive terminal UVW Power transistor (+) UVW Power transistor (-)

Normal resistance Several k to several M

Abnormal resistance 0 or 

Page 89

WARNING

15. Disassembly and Assembly Instructions

High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks.

15.1 CS-S9NKR CS-S12NKR

15.1.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal

Procedures

15.1.1.1 To remove front grille

Figure 1

15.1.1.2 To remove main electronic controller

Figure 2

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Figure 3 Figure 4

15.1.1.3 To remove discharge grille

Figure 5

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15.1.1.4 To remove control board

Figure 6

15.1.1.5 To remove cross flow fan and indoor fan motor

Figure 7

Figure 8

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Figure 9

Figure 10

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15.2 CS-S18NKR CS-S24NKR CS-S28NKR

15.2.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal

Procedures

15.2.1.1 To remove front grille

Figure 11

15.2.1.2 To remove horizontal vane

Figure 12

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15.2.1.3 To remove main electronic controller

Figure 13

Figure 14 Figure 15

15.2.1.4 To remove discharge grille

Figure 16

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15.2.1.5 To remove control board

Figure 17

15.2.1.6 To remove cross flow fan and indoor fan motor

Figure 18

Figure 19

Page 96

Figure 20

Figure 21

Page 97

15.3 Outdoor Electronic Controller Removal Procedures

15.3.1 CU-S9NKR CU-S12NKR

1. Remove 5 screws of the Top Panel.

Figure 1

2. Remove the 8 screws of the Front Panel.

Figure 2

Screws

Screw

Screws

Top Panel

Screws

Screw

Front Panel

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3. Remove the screw of the Terminal Board Cover.

4. Remove the Top Cover of the Control Board by 4 hooks.

Figure 3

Figure 4

Figure 5

Figure 6

Top Cove

Screw

Terminal Board Cove

Control Board

Hooks

Remove 2 screws

Remove 1 screw

Remove earth wire

Remove 2 connectors from reactor

Remove 5 connectors from electronic controlle

Page 99

15.4 Outdoor Electronic Controller Removal Procedures

15.4.1 CU-S18NKR CU-S24NKR CU-S28NKR

1. Remove 8 screws of the Top Panel.

Figure 1

2. Remove the 8 screws of the Front Panel.

Figure 2

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100

3. Remove the Top Cover of the Electronic Controller.

Figure 3

4. Remove the control board.

Figure 4

5. Remove the 6 screws of the Electronic Controller.

Figure 5