Panasonic CS-KS18B4UW, CS-KS12NB41, CU-KS12NK1A, CZ-18BT1U User Manual

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TECHNICAL & SERVICE MANUAL

CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

DC INVERTER SPLIT SYSTEM AIR CONDITIONER

Indoor Model No.

Body (Panel)

CS-KS12NB41 (CZ-18BT1U)

CS-KS18NB4UW (CZ-18BT1U)

Product Code No.

Body (Panel)

1 852 361 04 (1 852 361 15)

1 852 361 06 (1 852 361 15)

Indoor Unit

Body

Panel

CS-KS12NB41 (Body) & CZ-18BT1U (Panel) CS-KS18NB4UW (Body) & CZ-18BT1U (Panel)

Outdoor Model No. Product Code No.

CU-KS18NKU

CU-KS12NK1A

CU-KS18NKUA

1 852 361 18

1 852 361 16

1 852 361 19

Outdoor Unit

CU-KS12NK1A

Remote Controller

Wired Remote Controller

(Option)

CU-KS18NKU CU-KS18NKUA

REFERENCE NO. SM700879

SAFETY PRECAUTIONS

• Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them.

• The precautionary items here are divided into " Warning" and " Caution" items. Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, are included in the " Warning" table. However, even precautionary items identified as " Caution" also have the potential for serious consequences if not performed correctly. Important safety precautions are described for all items in both categories. Be sure to carefully follow all of them.

• Symbol Indication

: This symbol indicates items to which we need to pay attention.

In this triangle, a definite precautionary item is described.

: This symbol indicates the item to be prohibited.

In or close to this circle, a prohibited item is described.

: This symbol indicates the items requiring special attention or instruction.

In or close to this circle, a prohibited item is described.

• After doing repair work, perform a test run to confirm that there are no abnormalities. At the same time, explain the precautions in use to the user.

Warning

Before performing an overhaul, disconnect the power plug or power cable from the unit. Performing the work with the power supplied to the unit, may cause an electric shock.

When repair work or circuit inspection that requires power supply for the air conditioner, is to be performed, do not touch the charging section. Doing so may cause an electric shock.

Prohibit

For the step-up capacitor attached to the electric section, perform the repair work after sufficiently discharging it. Insufficient capacitor discharge may cause an electric shock.

Do not perform repair work on the electric sections with wet hands. Doing so may cause an electric shock.

Do not start or stop the air conditioner by means of connecting or disconnecting the power plug. Doing so may cause an electric shock or fire.

When conducting repair work only use components included in the parts list for the corresponding unit and perform the work with the appropriate tools. Incorrect or poor repair work may cause an electric shock or fire.

Never modify the unit. Doing so may cause an electric shock or fire.

Perform all electric work according to local applicable regulations related to electrical equipment or interior wiring regulation and make sure to use the exclusive circuit. Insufficient capacity to the electric circuit or defective arrangement results may cause an electric shock or fire.

Make sure to replace any power cable or lead wire showing any signs of scratch or deterioration. Failure to do so may cause an electric shock, overheating or fire.

Make sure that there is no dust on or slack in the power plug and insert fully into the socket. Dust or incomplete connections may cause an electric shock or fire.

Do not damage or process the power cord, as it may cause an electric shock or fire.

Prohibit

For the wiring between the indoor unit and outdoor unit, securely fix the specified cable onto the terminal plate. Poorly fixed wiring may cause a heat or fire.

After connecting the wiring between the indoor unit and outdoor unit, attach the terminal cover securely. Incomplete attachment of the terminal cover may cause overheating or fire.

Warning

If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite.

If refrigerant gas leaks during the work, ventilate the room. If refrigerant gas catches fire, harmful gas may be generated.

Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle. If air or other contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle, which may cause a unit breakdown."

When the welded section of the compressor intake or discharge pipe is to be disconnected, perform it in a well-ventilated place after sufficiently recovering the refrigerant gas. Any residue gas may jet out refrigerant or refrigerating machine oil, which may cause an injury.

When the work is to be performed in a high place (About 2 meters or more), make sure to wear a safety helmet, gloves and safety belt. Insufficient safety gear may cause a serious injury in case of a fall.

When the unit is to be relocated, confirm that the new installation location has sufficient strength for the weight of the unit. Insufficient strength of the installation location and incomplete installation work may cause an injury due to the unit falling.

When the remote controller batteries are replaced, dispose of the old batteries out of the reach of children. If a child swallows a battery, make sure that the child gets immediate medical attention.

Caution

Prohibit

Do not wash the air conditioner with water, as this may cause an electric shock or fire.

For the repair work in places with high humidity or moisture, make sure to ground the unit. Failure to do so may cause an electric shock.

Confirm that the component attachment position, wiring condition, soldering condition and connector connection are normal. If not, it may cause overheating or fire.

Confirm that the temperature around the compressor is not too high, and then perform the repair work. Failure to do so may cause a burn.

Perform welding work in a place with good ventilation. If the work is performed in a poorly ventilated area, it might cause a lack of oxygen.

If the installation plate or attachment frame has deteriorated due to corrosion, etc., replace it. Failure to do so may cause an injury due to the unit falling.

When the cleaning is to be performed, make sure to turn off the power and pull out the plug. Touching the fan that is rotating at high speed may result in an injury.

When the indoor unit is to be removed, do not place it on an incline. Doing so may cause wet furniture because water left inside may trickle down.

Do not hold the sharp end of the unit or the aluminum fins, as it may cause an injury to your hand or finger.

Prohibit

After repairs, make sure to measure the insulation resistance and confirm that the value is 1 Mohm or more. Any insulation error may cause an electric shock.

After repairs, make sure to check the drainage of the indoor unit. Inappropriate drainage may cause wet furniture and floors due to water leakage.

Page

SAFETY PRECAUTIONS

TABLE OF CONTENTS

1. OPERATING RANGE

2. SPECIFICATIONS

2-1. Unit Specifications 2-2. Major Component Specifications 2-3. Other Component Specifications

3. DIMENSIONAL DATA

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

5. PERFORMANCE DATA

5-1. Temperature Charts 5-2. Cooling Capacity 5-3. Cooling Capacity (Low Ambient)

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7 17 22

28 30 32

6. ELECTRICAL DATA

6-1. Electrical Characteristics 6-2. Electric Wiring Diagrams

7. MAINTENANCE

7-1. Address Setting of the Remote Control Unit 7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit 7-3. Disassembly Procedure

8. FUNCTIONS

8-1. Operation Functions 8-2. Protective Functions

9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)

9-1. Precautions before Performing Inspection or Repair 9-2. Method of Self-Diagnostics 9-3. Checking the Indoor and Outdoor Units 9-4. Trouble Diagnosis of Fan Motor 9-5. Noise Malfunction and Electromagnetic Interference

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34 36

39 40 41

48 50

51 51 53 57 59

10. CHECKING ELECTRICAL COMPONENTS

10-1. Measurement of Insulation Resistance 10-2. Checking Continuity of Fuse on PCB Ass'y

11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT

11-1. Characteristics of New Refrigerant R410A 11-2. Checklist before Servicing 11-3. Tools Specifically for R410A 11-4. Tubing Installation Procedures 11-5. In Case of Compressor Malfunction 11-6. In Case Refrigerant is Leaking 11-7. Charging Additional Refrigerant 11-8. Retro-Fitting Existing Systems

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Page

60 61

62 63 64 64 65 67 68 68

APPENDIX A Operating Instructions

CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A

CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU

CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

APPENDIX B INSTALLATION INSTRUCTIONS

CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A

CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU

CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

APPENDIX C Operating Instructions

(CZ-RD515U)

APPENDIX D INSTALLATION INSTRUCTIONS

(CZ-RD515U)

()

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............................................................................................

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A-1

A-2

A-3

A-4

1. OPERATING RANGE

Models : CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

Cooling

Maximum

Minimum

Models : CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

Cooling

Maximum

Minimum

95 °F DB / 71 °F WB

67 °F DB / 57 °F WB

95 °F DB / 71 °F WB

67 °F DB / 57 °F WB

115 °F DB

67 °F DB

115 °F DB

0 °F DB

2. SPECIFICATIONS

2-1. Unit Specifications

2-1-1.

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU

Voltage Rating

Total Capacity

Sensible Capacity Latent Capacity

Performance

Air Circulation (Hi/Me/Lo) ft Moisture Removal (High) Pints/h Available Voltage Range Running Amperes

EER BTU/h/W 9.41 SEER BTU/Wh 16 Compressor Locked Rotor Amperes

Electrical Rating

Fuse or Circuit Breaker Capacity A 15 Controls / Temperature Control Control Unit Timer

Indoor / OutdoorFan Speeds

Airflow Direction (Indoor) Horizontal

Air Filter Compressor Refrigerant / Amount charged at shipment Ibs (g) Refrigerant Control

Features

Operation Sound

Refrigerant Tubing Connections

Refrigerant inch (mm) Tube Diameter inch (mm) Wired Remote Controller (Option) CZ-RD515U

Indoor : Hi/Me/Lo Outdoor : Hi

Narrow tube Wide tube

BTU/h

BTU/h BTU/h

/min (m3/h)

Vertical

dB-A dB-A

ft (m)Max. allowable tubing length at shipment

A WPower Input %Power Factor 97

A 17.5

24-Hour ON or OFF Timer, 1-Hour OFF Timer

230V Single-Phase 60Hz

17,500

5.15

341 (579) / 294 (500) / 253 (430)

8.3

1,860

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Auto and 3 steps / Auto (Hi, Me, Lo)

Washable, Anti-Mold

DC Twin Rotary (Inverter)

R410A / 2.87 (1,300)

Electric Expansion Valve

44 / 40 / 36

Flare Type

< 230V >

Cooling

( 4,000 to 17,500 ) ( 1.2 to 5.15 )

10,600

6,900

4.89 187 to 253 ( 1.2 to 8.3 ) ( 250 to 1,860 )

Auto

25 (7.5) 1/4 (6.35) 1/2 (12.7)

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU

Dimensions & Weight (Indoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Shipping Volume

Net Shipping

inch (mm)

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

Indoor Unit

(CS-KS18NB4UW & CZ-18BT1U)

(313)12-5/16

(625)24-19/32 (625)24-19/32

(18.7)41.3

)

Individual Unit

Body

(CS-KS18NB4UW)

11-5/32 (283)

22-5/8 (575) 22-5/8 (575)

24-19/32 (625) 24-19/32 (625)

11-13/32 (290)

24-13/16 (630)

28-1/8 (714)

26-11/16 (678)

35.3 (16)

41.9 (19)

4.59 (0.13)

< 230V >

Panel

(CZ-18BT1U)

1-9/16 (40)

4-1/8 (105)

26-3/16 (665)

6.0 (2.7)

7.7 (3.5)

1.65 (0.04)

Dimensions & Weight (Outdoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Net Shipping

Shipping Volume

Remarks: Rating conditions are:

Cooling: Indoor air temperature 80 °F DB / 67 °F WB

Outdoor air temperature 95 °F DB / 75 °F WB

Outdoor Unit

(CU-KS18NKU)

inch (mm) (670)26-3/8

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

(880)34-21/32 (285)11-7/32 (733)28-27/32

(1,012)39-27/32 (379)14-29/32 (41.0)90.4 (45.0)99.2

(0.28)9.88

2-1-2.

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU

Voltage Rating

Total Capacity

Sensible Capacity Latent Capacity

Performance

Air Circulation (Hi/Me/Lo) ft Moisture Removal (High) Pints/h Available Voltage Range Running Amperes

EER BTU/h/W 9.41 SEER BTU/Wh 16 Compressor Locked Rotor Amperes

Electrical Rating

Fuse or Circuit Breaker Capacity A 15 Controls / Temperature Control Control Unit Timer

Indoor / OutdoorFan Speeds

Airflow Direction (Indoor) Horizontal

Air Filter Compressor Refrigerant / Amount charged at shipment Ibs (g) Refrigerant Control

Features

Operation Sound

Refrigerant Tubing Connections

Refrigerant inch (mm) Tube Diameter inch (mm) Wired Remote Controller (Option) CZ-RD515U

Indoor : Hi/Me/Lo Outdoor : Hi

Narrow tube Wide tube

BTU/h

BTU/h BTU/h

/min (m3/h)

Vertical

dB-A dB-A

ft (m)Max. allowable tubing length at shipment

A WPower Input %Power Factor 98

A 17.5

24-Hour ON or OFF Timer, 1-Hour OFF Timer

208V Single-Phase 60Hz

17,500

5.15

341 (579) / 294 (500) / 253 (430)

9.1

1,860

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Auto and 3 steps / Auto (Hi, Me, Lo)

Washable, Anti-Mold

DC Twin Rotary (Inverter)

R410A / 2.87 (1,300)

Electric Expansion Valve

44 / 40 / 36

Flare Type

< 208V >

Cooling

( 4,000 to 17,500 ) ( 1.2 to 5.15 )

10,600

6,900

4.89 187 to 253 ( 1.2 to 9.1 ) ( 250 to 1,860 )

Auto

25 (7.5) 1/4 (6.35) 1/2 (12.7)

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU

Dimensions & Weight (Indoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Shipping Volume

Net Shipping

inch (mm)

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

Indoor Unit

(CS-KS18NB4UW & CZ-18BT1U)

(313)12-5/16

(625)24-19/32 (625)24-19/32

(18.7)41.3

)

Individual Unit

Body

(CS-KS18NB4UW)

11-5/32 (283)

22-5/8 (575) 22-5/8 (575)

24-19/32 (625) 24-19/32 (625)

11-13/32 (290)

24-13/16 (630)

28-1/8 (714)

26-11/16 (678)

35.3 (16)

41.9 (19)

4.59 (0.13)

< 208V >

Panel

(CZ-18BT1U)

1-9/16 (40)

4-1/8 (105)

26-3/16 (665)

6.0 (2.7)

7.7 (3.5)

1.65 (0.04)

Dimensions & Weight (Outdoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Net Shipping

Shipping Volume

Remarks: Rating conditions are:

Cooling: Indoor air temperature

Outdoor air temperature

80 °F DB / 67 °F WB 95 °F DB / 75 °F WB

Outdoor Unit

(CU-KS18NKU)

inch (mm) (670)26-3/8

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

(880)34-21/32 (285)11-7/32 (733)28-27/32

(1,012)39-27/32 (379)14-29/32 (41.0)90.4 (45.0)99.2

(0.28)9.88

2-1-3.

Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A

Voltage Rating

Total Capacity

Sensible Capacity Latent Capacity

Performance

Air Circulation (Hi/Me/Lo) ft Moisture Removal (High) Pints/h Available Voltage Range Running Amperes

EER BTU/h/W 9.44 SEER BTU/Wh 16 Compressor Locked Rotor Amperes

Electrical Rating

Fuse or Circuit Breaker Capacity A 20 Controls / Temperature Control Control Unit Timer

Indoor / OutdoorFan Speeds

Airflow Direction (Indoor) Horizontal

Air Filter Compressor Refrigerant / Amount charged at shipment Ibs (g) Refrigerant Control

Features

Operation Sound

Refrigerant Tubing Connections

Refrigerant inch (mm) Tube Diameter inch (mm) Wired Remote Controller (Option) CZ-RD515U

Indoor : Hi/Me/Lo Outdoor : Hi

Narrow tube Wide tube

BTU/h

BTU/h BTU/h

/min (m3/h)

Vertical

dB-A dB-A

ft (m)Max. allowable tubing length at shipment

A WPower Input %Power Factor 87

A20

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps / Auto (Hi and multi steps)

115V Single-Phase 60Hz

Cooling

11,900

235 (399) / 206 (350) / 194 (330)

12.6

1,260

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

( 3,000 to 11,900 )

3.5

( 0.9 to 3.5 )

7,200 4,700

4.26 104 to 126 ( 2.5 to 12.6 ) ( 250 to 1,260 )

Auto

Washable, Anti-Mold

DC Rotary (Inverter)

R410A / 2.43 (1,100)

Electric Expansion Valve

34 / 32 / 31

Flare Type

25 (7.5) 1/4 (6.35) 3/8 (9.52)

Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A

Dimensions & Weight (Indoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth 28-1/8 (714)

Weight Ib. (kg)

Net Shipping

Shipping Volume

Dimensions & Weight (Outdoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Net Shipping

Shipping Volume

Remarks: Rating conditions are:

Cooling: Indoor air temperature

Outdoor air temperature

80 °F DB / 67 °F WB 95 °F DB / 75 °F WB

Indoor Unit

(CS-KS12NB41 & CZ-18BT1U)

inch (mm) (313)12-5/16

inch (mm) 22-5/8 (575) inch (mm)

(625)24-19/32 (625)24-19/32

inch (mm) -

inch (mm) 24-13/16 (630) inch (mm)

(18.7)41.3

Ib. (kg)

cu.ft (m

)

Body

(CS-KS12NB41)

11-5/32 (283)

22-5/8 (575)

11-13/32 (290)

35.3 (16)

41.9 (19)

4.59 (0.13)

Outdoor Unit

(CU-KS12NK1A)

inch (mm) (548)21-9/16

Individual Unit

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

(720)28-11/32 (265)10-7/16 (596)23-15/32

(866)34-3/32 (368)14-1/2 (34.0)75.0

Ib. (kg)

cu.ft (m

)

(37.0)81.6

(0.18)6.35

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Panel

(CZ-18BT1U)

1-9/16 (40)

24-19/32 (625) 24-19/32 (625)

4-1/8 (105)

26-3/16 (665)

26-11/16 (678)

6.0 (2.7)

7.7 (3.5)

1.65 (0.04)

2-1-4.

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA

Voltage Rating

Total Capacity

Sensible Capacity Latent Capacity

Performance

Air Circulation (Hi/Me/Lo) ft Moisture Removal (High) Pints/h Available Voltage Range Running Amperes

EER BTU/h/W 9.41 SEER BTU/Wh 16 Compressor Locked Rotor Amperes

Electrical Rating

Fuse or Circuit Breaker Capacity A 15 Controls / Temperature Control Control Unit Timer

Indoor / OutdoorFan Speeds

Airflow Direction (Indoor) Horizontal

Air Filter Compressor Refrigerant / Amount charged at shipment Ibs (g) Refrigerant Control

Features

Operation Sound

Refrigerant Tubing Connections

Refrigerant inch (mm) Tube Diameter inch (mm) Wired Remote Controller (Option) CZ-RD515U

Indoor : Hi/Me/Lo Outdoor : Hi

Narrow tube Wide tube

BTU/h

BTU/h BTU/h

/min (m3/h)

Vertical

dB-A dB-A

ft (m)Max. allowable tubing length at shipment

A WPower Input %Power Factor 97

A 17.5

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps / Auto (Hi and multi steps)

230V Single-Phase 60Hz

17,500

5.15

341 (579) / 294 (500) / 253 (430)

8.3

1,860

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Washable, Anti-Mold

DC Twin Rotary (Inverter)

R410A / 2.87 (1,300)

Electric Expansion Valve

44 / 40 / 36

Flare Type

< 230V >

Cooling

( 4,000 to 17,500 ) ( 1.2 to 5.15 )

10,600

6,900

4.89 187 to 253 ( 1.2 to 8.3 ) ( 250 to 1,860 )

Auto

25 (7.5) 1/4 (6.35) 1/2 (12.7)

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA

Dimensions & Weight (Indoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Shipping Volume

Net Shipping

inch (mm)

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

Indoor Unit

(CS-KS18NB4UW & CZ-18BT1U)

(313)12-5/16

(625)24-19/32 (625)24-19/32

(18.7)41.3

)

Individual Unit

Body

(CS-KS18NB4UW)

11-5/32 (283)

22-5/8 (575) 22-5/8 (575)

24-19/32 (625) 24-19/32 (625)

11-13/32 (290)

24-13/16 (630)

28-1/8 (714)

26-11/16 (678)

35.3 (16)

41.9 (19)

4.59 (0.13)

< 230V >

Panel

(CZ-18BT1U)

1-9/16 (40)

4-1/8 (105)

26-3/16 (665)

6.0 (2.7)

7.7 (3.5)

1.65 (0.04)

Dimensions & Weight (Outdoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Net Shipping

Shipping Volume

Remarks: Rating conditions are:

Cooling: Indoor air temperature

Outdoor air temperature

80 °F DB / 67 °F WB 95 °F DB / 75 °F WB

Outdoor Unit

(CU-KS18NKUA)

inch (mm) (670)26-3/8

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

(880)34-21/32 (285)11-7/32 (733)28-27/32

(1,012)39-27/32 (379)14-29/32 (41.0)90.4 (45.0)99.2

(0.28)9.88

2-1-5.

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA

Voltage Rating

Total Capacity

Sensible Capacity Latent Capacity

Performance

Air Circulation (Hi/Me/Lo) ft Moisture Removal (High) Pints/h Available Voltage Range Running Amperes

EER BTU/h/W 9.41 SEER BTU/Wh 16 Compressor Locked Rotor Amperes

Electrical Rating

Fuse or Circuit Breaker Capacity A 15 Controls / Temperature Control Control Unit Timer

Indoor / OutdoorFan Speeds

Airflow Direction (Indoor) Horizontal

Air Filter Compressor Refrigerant / Amount charged at shipment Ibs (g) Refrigerant Control

Features

Operation Sound

Refrigerant Tubing Connections

Refrigerant inch (mm) Tube Diameter inch (mm) Wired Remote Controller (Option) CZ-RD515U

Indoor : Hi/Me/Lo Outdoor : Hi

Narrow tube Wide tube

BTU/h

BTU/h BTU/h

/min (m3/h)

Vertical

dB-A dB-A

ft (m)Max. allowable tubing length at shipment

A WPower Input %Power Factor 98

A 17.5

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps / Auto (Hi and multi steps)

208V Single-Phase 60Hz

17,500

5.15

341 (579) / 294 (500) / 253 (430)

9.1

1,860

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Washable, Anti-Mold

DC Twin Rotary (Inverter)

R410A / 2.87 (1,300)

Electric Expansion Valve

44 / 40 / 36

Flare Type

< 208V >

Cooling

( 4,000 to 17,500 ) ( 1.2 to 5.15 )

10,600

6,900

4.89 187 to 253 ( 1.2 to 9.1 ) ( 250 to 1,860 )

Auto

25 (7.5) 1/4 (6.35) 1/2 (12.7)

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA

Dimensions & Weight (Indoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Shipping Volume

Net Shipping

inch (mm)

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

Indoor Unit

(CS-KS18NB4UW & CZ-18BT1U)

(313)12-5/16

(625)24-19/32 (625)24-19/32

(18.7)41.3

)

Individual Unit

Body

(CS-KS18NB4UW)

11-5/32 (283)

22-5/8 (575) 22-5/8 (575)

24-19/32 (625) 24-19/32 (625)

11-13/32 (290)

24-13/16 (630)

28-1/8 (714)

26-11/16 (678)

35.3 (16)

41.9 (19)

4.59 (0.13)

< 208V >

Panel

(CZ-18BT1U)

1-9/16 (40)

4-1/8 (105)

26-3/16 (665)

6.0 (2.7)

7.7 (3.5)

1.65 (0.04)

Dimensions & Weight (Outdoor Unit)

Unit Dimensions Height

Width Depth

Package Dimensions Height

Width Depth

Weight Ib. (kg)

Net Shipping

Shipping Volume

Remarks: Rating conditions are:

Cooling: Indoor air temperature

Outdoor air temperature

80 °F DB / 67 °F WB 95 °F DB / 75 °F WB

Outdoor Unit

(CU-KS18NKUA)

inch (mm) (670)26-3/8

inch (mm) inch (mm) inch (mm)

inch (mm) inch (mm)

Ib. (kg)

cu.ft (m

)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

(880)34-21/32 (285)11-7/32 (733)28-27/32

(1,012)39-27/32 (379)14-29/32 (41.0)90.4 (45.0)99.2

(0.28)9.88

2-2. Major Component Specifications

2-2-1. Indoor Unit

Indoor Unit (Body) CS-KS12NB41

Control PCB

Part No.

Controls

Control Circuit Fuse

Fan

Type Q'ty ... Dia. and Length

Fan Motor

Type Model ... Q'ty No. of Poles

Rough Measure RPM (Cool)

Rating Voltage / Nominal Output

Coil Resistance

(Ambient Temp. 68 °F (20 °C))

Safety Device

Type Over- Current Protection Over- Heat Protection

Run Capacitor Micro F

inch (mm)

Ohm

VAC

CB-CS-KS12NB4U

Microprocessor

250V 3A

Turbo

1 ... D12-5/8 / L5-3/4 (D322/L147)

DC Motor

SIC-62FW-D866-2 ... 1

470

DC160V / 23W

Internal Controller

Yes Yes

Drain Pump

Model ... Q'ty

Rating Voltage, Hz

(Ambient Temp. 68 °F (20 °C))

Safty Device

Heat Exchanger Coil

Coil

Rows Fins per inch

Input

Type Open

Ohm

°F (°C)

(m2)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

PLD-12115ST-1 ... 1

Aluminum Plate Fin / Copper Tube

Indoor Unit (Panel) CZ-18BT1U

Flap Motor

Type Stepping Motor

Model ... Q'ty

Rating

Coil Resistance Ohm

(Ambient Temp. 77 °F (25 °C))

Each Pair of Terminal : 380 +/- 7%

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

AC115V, 60Hz

10.8

101 +/- 10%Coil Resistance

Thermal Fuse

293 (145)

18.1

2.94 (0.273) Face Area

MP24ZN-12V ... 2

DC 12V

Indoor Unit (Body) CS-KS18NB4UW

Control PCB

Part No.

Controls

Control Circuit Fuse

Fan

Type Q'ty ... Dia. and Length

Fan Motor

Type Model ... Q'ty No. of Poles

Rough Measure RPM (Cool)

Coil Resistance

(Ambient Temp. 68 °F (20 °C))

Safety Device

Type Over- Current Protection Over- Heat Protection

Run Capacitor Micro F

inch (mm)

Ohm

VAC

CB-CS-KS18NB4U

Microprocessor

250V 3A

Turbo

1 ... D12-5/8 / L5-3/4 (D322/L147)

DC Motor

SIC-62FW-D866-2 ... 1

650

DC340V / 20WRating Voltage / Nominal Output

Internal Controller

Yes Yes

Drain Pump

Model ... Q'ty

PLD-12230ST-1 ... 1

Rating Voltage, Hz

Input

Ohm

(Ambient Temp. 68 °F (20 °C))

Safty Device

Type Open

°F (°C)

Heat Exchanger Coil

Coil

Aluminum Plate Fin / Copper Tube

Rows Fins per inch

(m2)

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Indoor Unit (Panel) CZ-18BT1U

Flap Motor

Type Stepping Motor

Model ... Q'ty

Rating

Coil Resistance Ohm

(Ambient Temp. 77 °F (25 °C))

Each Pair of Terminal : 380 +/- 7%

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

MP24ZN-12V ... 2

AC208 to 240V, 60Hz

10.8

333 +/- 10%Coil Resistance

Thermal Fuse

293 (145)

18.1

2.94 (0.273) Face Area

DC 12V

2-2-2. Outdoor Unit

Outdoor Unit CU-KS18NKU

Control PCB

Part No.

Controls

Control Circuit Fuse

Compressor

Type

Compressor Model / Nominal Output

Compressor Oil ... Amount

Coil Resistance (Ambient Temp. 68 °F (20 °C))

Safety Device

CT (Peak current cut-off control) Compressor Discharge Temp. Control

Operation cut-off control in abnormal ambient Temp.

Overload Relay

Run Capacitor

Crankcase Heater

Pints (cc)

Ohm

Model

Operation Temp.

Micro F

VAC

CB-CU-KS18NKU

Microprocessor

250V 25A

DC Twin Rotary (Hermetic)

C-6RVN93H0M / 1,050W

FV50S ... 0.74 (350)

R - S :

S - T :

T - R :

0.482

Yes Yes Yes

CS-7L115

Open : 239 °F (115 °C), Close : 203 °F (95 °C)

Fan

Type

Q'ty ... Dia. inch (mm)

Fan Motor

Type Model ... Q'ty No. of Poles

Rough Measure RPM (Cool)

Nominal Output

Coil Resistance

(Ambient Temp. 68 °F (20 °C))

Safety Device

Type Over- Current Protection

Run Capacitor

Heat Exchanger Coil

Coil

Rows Fins per inch

Face Area

Ohm

Micro F

VAC

(m2)

Propeller

1 ... D16-17/32 (D420)

DC Motor

SIC-67FV-F460-1 ... 1

820

RED - WHT :

WHT - BLU :

BLU - RED :

77.5

Internal Controller

Yes

Aluminum Plate Fin / Copper Tube

21.2

5.49 (0.510)

External Finish Acrylic baked-on enamel finish

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Outdoor Unit CU-KS12NK1A

Control PCB

Part No.

Controls

Control Circuit Fuse

Compressor

Type

Compressor Model / Nominal Output

Compressor Oil ... Amount

Coil Resistance (Ambient Temp. 68 °F (20 °C))

Safety Device

CT (Peak current cut-off control) Compressor Discharge Temp. Control

Operation cut-off control in abnormal ambient Temp.

Overload Relay

Run Capacitor

Crankcase Heater

Pints (cc)

Ohm

Model

Operation Temp.

Micro F

VAC

CB-CU-KS12NK1A

Microprocessor

125V 25A

DC Rotary (Hermetic)

G4C090LU1ER / 900W

FV50S ... 0.68 (320)

U - V :

V - W :

W - U :

0.81

Yes Yes Yes

CS-7L115

Open : 239 °F (115 °C), Close : 203 °F (95 °C)

115V 20W

Fan

Type

Q'ty ... Dia. inch (mm)

Fan Motor

Type Model ... Q'ty No. of Poles

Rough Measure RPM (Cool)

Nominal Output

Coil Resistance

(Ambient Temp. 68 °F (20 °C))

Safety Device

Type Over- Current Protection

Run Capacitor

Heat Exchanger Coil

Coil

Rows Fins per inch

Face Area

Ohm

Micro F

VAC

(m2)

Propeller

1 ... D15-3/4 (D400)

DC Motor

SIC-67FV-F460-1 ... 1

750

RED - WHT :

WHT - BLU :

BLU - RED :

77.5

Internal Controller

Yes

Aluminum Plate Fin / Copper Tube

18.1

3.95 (0.367)

External Finish Acrylic baked-on enamel finish

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Outdoor Unit CU-KS18NKUA

Control PCB

Part No.

Controls

Control Circuit Fuse

Compressor

Type

Compressor Model / Nominal Output

Compressor Oil ... Amount

Coil Resistance (Ambient Temp. 68 °F (20 °C))

Safety Device

CT (Peak current cut-off control) Compressor Discharge Temp. Control

Operation cut-off control in abnormal ambient Temp.

Overload Relay

Run Capacitor

Crankcase Heater

Pints (cc)

Ohm

Model

Operation Temp.

Micro F

VAC

CB-CU-KS18NKUA

Microprocessor

250V 25A

DC Twin Rotary (Hermetic)

C-6RVN93H0M / 1,050W

FV50S ... 0.74 (350)

R - S :

S - T :

T - R :

0.482

Yes Yes Yes

CS-7L115

Open : 239 °F (115 °C), Close : 203 °F (95 °C)

Fan

Type

Q'ty ... Dia. inch (mm)

Fan Motor

Type Model ... Q'ty No. of Poles

Rough Measure RPM (Cool)

Nominal Output

Coil Resistance

(Ambient Temp. 68 °F (20 °C))

Safety Device

Type Over- Current Protection

Run Capacitor

Heat Exchanger Coil

Coil

Rows Fins per inch

Face Area

Ohm

Micro F

VAC

(m2)

Propeller

1 ... D16-17/32 (D420)

DC Motor

SIC-67FV-F460-1 ... 1

820

RED - WHT :

WHT - BLU :

BLU - RED :

77.5

Internal Controller

Yes

Aluminum Plate Fin / Copper Tube

21.2

5.49 (0.510)

External Finish Acrylic baked-on enamel finish

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

2-3. Other Component Specifications

Indoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU CU-KS12NK1A CU-KS18NKUA

• Indoor air temp sensor

(Model:KTEC-35-S98)

• Indoor heat exchanger sensor

(Model:PT2M-51H-S3)

• Compressor temp sensor

(CU-KS12NK1A

(CU-KS18NKU , CU-KS18NKUA

...

Model:DTN-TKS274Y TH2)

...

Model:DTN-TKS293B)

Resistance (k ohm)

59 68 77 86 95 104

(10) (15) (20) (25) (30) (35) (40)

Temperature °F (°C)

200

180

160

140

120

100

Resistance (k ohm)

32 50 68 86 104 122 140 158 176 194 (0) (10) (20) (30) (40) (50) (60) (70)(80) (90)

Temperature °F (°C)

• Outdoor air temp sensor

(CU-KS12NK1A

(CU-KS18NKU , CU-KS18NKUA

...

Model:DTN-TKS269B)

• Outdoor heat exchanger sensor

(CU-KS12NK1A

(CU-KS18NKU , CU-KS18NKUA

...

Model:DTN-TKS274Y TH1)

...

Model:TKS295B)

...

Model:TKS292B)

Resistance (k ohm)

4 5 14 23 32 41 50 59 68

(

20)(-15)(-10) (-5) (0) (5) (10) (15) (20)

Temperature °F (°C)

3. DIMENSIONAL DATA

Indoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U

7-11/16

4-29/32

A View

1-3/16

21/32

3-1/8

(534)

23-5/8 (600)

21-1/32

Suspension bolt pitch

Ceiling opening dimensions

Center of

panel

(flared)

1/4" (flared)

dia.

dia. 1/2"

23-5/8 (600)

21-1/32 (534)

Ceiling opening dimensions

Suspension bolt pitch

12-7/16

12-7/8

22-5/8 (575)

6-5/16 6-11/16

2-3/32

1-25/32

11-5/32 (283)

8-15/32

1-3/16 (30)

1-25/32

4-19/32

Less than 31/32 Less than 31/32

The length of the suspension

14-3/32 (358)

24-19/32 (625)

25/32

bolts should be selected so that

there is a gap of 1-3/16" or

the ceiling (21/32" or more

below the lower surface of the

main unit), as shown in the

figure at right. If the suspension

bolts is too long, it will contact

the ceiling panel and the unit

cannot be installed.

24-19/32 (625)

13-5/32 (334)

5-9/16

2-3/4 1-9/32

(liquid tube)

Air intake

Discharge outlet

Refrigerant tubing

(gas tube)

22-5/8 (575)

Refrigerant tubing

Drain tube connection port VP20 (outer dia. 1")

Power supply port

Suspension bolt hole (4 - 1/2" x 1-1/8" hole)

Fresh air intake duct connection port (dia. 3-7/8")

2-3/32

3-5/8

7-23/32

1-27/32 1-3/32

Unit : inch (mm)

Outdoor Unit CU-KS12NK1A

3-19/32

10-13/16

21-3/16

ID:23/32

28-11/32 (720) 2-1/8

2-ID:15/16

3-19/32

15/32

11-13/32

10-7/16(265)

12-7/16

Wide tube service valve dia.3/8" (9.52)

Narrow tube service valve dia.1/4" (6.35)

5/8

21-9/16 (548)

4-9/32 2-5/32

6-3/32

Unit : inch (mm) (852-0-0010-12600-0)

Outdoor Unit CU-KS18NKU

CU-KS18NKUA

23-15/16 5-11/32

1-3/8

11-17/32

ID:23/32

34-21/32 (880)

2-ID:15/16

15/32

2-17/32

12-7/32

11-7/32 (285)

13-5/32

Wide tube service valve dia.1/2" (12.70)

Narrow tube service valve dia.1/4" (6.35)

1-13/16

23/32

2-13/32

26-3/8 (670)

6-17/32

4-3/8 2-5/32

3/32

5-23/32

Unit : inch (mm) (852-0-0010-13300-0)

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A

Indoor unit

Heat exchanger

Strainer

Wide tube

O.D. 3/8" (9.52 mm)

Narrow tube

O.D. 1/4" (6.35 mm)

Wide tube service valve

Narrow tube service valve

Muffler

Outdoor unit

Accumulator

Electric

expansion

valve

Muffler

High pressure

switch

H.P.

Compressor

Heat exchanger

Cooling cycle

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU

CU-KS18NKUA

Indoor unit

Heat exchanger

Strainer

Wide tube

O.D.

1/2"

(12.7mm)

Narrow tube

O.D. 1/4" (6.35 mm)

Wide tube service valve

Narrow tube service valve

Muffler

Outdoor unit

Accumulator

Electric

expansion

valve

High pressure

switch

H.P.

Compressor

Heat exchanger

Cooling cycle

5. PERFORMANCE DATA

5-1. Temperature Charts

Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A

Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 115V)

(1) Low pressure performance chart

Hi FanLo Fan

131

(0.9)

psig(MPaG)

102

(0.7)

Low pressure at wide tube service valve

(0.5)

(2) Operating current performance chart

(25)

Outdoor inlet air DB temp. °F(°C)

Indoor Air Temp.86°F (30°C)

80°F (27°C)

75°F (24°C)

(30)

Hi FanLo Fan

(35)

104

(40)

Operating current (A)

(25)

(3) Indoor discharge air performance chart

(20)

(15)

(10)

41 (5)

Indoor discharge air temperature °F(°C)

(0)

(25)

Indoor Air Temp.86°F (30°C)

(30)

Outdoor inlet air DB temp. °F(°C)

Hi FanLo Fan

Indoor Air Temp.86°F (30°C)

80°F (27°C)

75°F (24°C)

(30)

Outdoor inlet air DB temp. °F(°C)

80°F (27°C)

75°F (24°C)

(35)

104

(40)

104

(40)

NOTE

Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU or CU-KS18NKUA

Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)

(1) Low pressure performance chart

Hi FanLo Fan

131

(0.9)

psig(MPaG)

102

(0.7)

Low pressure at wide tube service valve

(0.5)

(2) Operating current performance chart

Indoor Air Temp.86°F (30°

(25)

(30)

Outdoor inlet air DB temp. °F(°C)

Hi FanLo Fan

Indoor Air Temp.86°F (30°C)

80°F (27°C)

75°F (24°C)

(35)

80°F (27°C)

75°F (24°C)

104

(40)

Operating current (A)

(25)

(30)

(35)

104

(40)

Outdoor inlet air DB temp. °F(°C)

(3) Indoor discharge air performance chart

(20)

(15)

(10)

41 (5)

Indoor discharge air temperature °F(°C)

(0)

(25)

Outdoor inlet air DB temp. °F(°C)

NOTE

• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.

Hi FanLo Fan

Indoor Air Temp.86°F (30°C)

80°F (27°C)80°F (27°C)

75°F (24°C)

(30)

(35)

104

(40)

5-2. Cooling Capacity

Indoor Unit : CS-KS12NB41 & CZ-18BT1U

Outdoor Unit : CU-KS12NK1A

Power Supply : 115V Single Phase 60Hz

< Cooling Capacity >

RATING CAPACITY: 11,900 BTU/h AIR FLOW RATE: 235 CFM

INDOOR OUTDOOR

ENT. TEMP.

WB DB 65 75 85 95 105 115

59 76 (24.4) SHC 7,210 7,300 7,440 7,480 7,660 6,930

(15.0) 80 (26.7) SHC 8,120 8,210 8,350 8,400 8,530 7,830

63 76 (24.4) SHC 7,940 7,800 7,710 7,570 7,070 5,840

(17.2) 80 (26.7) SHC 8,850 8,720 8,580 8,490 7,980 6,750

67 76 (24.4) SHC 6,660 6,570 6,480 6,380 5,880 4,740

(19.4) 80 (26.7) SHC 7,570 7,480 7,390 7,300 6,750 5,650

71 76 (24.4) SHC 5,330 5,290 5,200 5,150 4,560 3,550

(21.7) 80 (26.7) SHC 6,250 6,200 6,110 6,060 5,470 4,460

75 76 (24.4) SHC 4,050 4,010 3,960 3,920 3,370 2,450

(23.9) 80 (26.7) SHC 4,970 4,920 4,880 4,830 4,280 3,370

NOTE

Rating conditions (#)

Above data does not take Freeze Prevention Protection during cooling operation into account. For this reason, the value may vary from the actual cooling characteristics.

3. Above data represents the value when the operation frequency of a compressor is fixed.

F (oC) AMBIENT TEMP. oF (oC)

TC 8,350 8,570 8,800 8,930 9,210 7,830

72 (22.2) SHC 6,340 6,430 6,570 6,610 6,800 6,060

84 (28.9) SHC 8,350 8,570 8,800 8,930 9,210 7,830 88 (31.1) SHC 8,350 8,570 8,800 8,930 9,210 7,830

TC 12,230 12,030 11,790 11,580 10,580 7,950

72 (22.2) SHC 7,070 6,930 6,840 6,700 6,200 4,970

84 (28.9) SHC 9,720 9,590 9,450 9,360 8,850 7,620 88 (31.1) SHC 10,590 10,450 10,360 10,230 9,720 7,950

TC 12,460 12,290 12,070 # 11,900 10,700 8,040

72 (22.2) SHC 5,790 5,700 5,610 5,520 4,970 3,870

84 (28.9) SHC 8,440 8,350 8,260 8,170 7,620 6,520 88 (31.1) SHC 9,310 9,220 9,130 9,040 8,490 7,390

TC 12,640 12,490 12,300 12,170 10,770 8,100

72 (22.2) SHC 4,460 4,420 4,330 4,280 3,690 2,680

84 (28.9) SHC 7,120 7,070 6,980 6,930 6,340 5,330 88 (31.1) SHC 7,980 7,940 7,850 7,800 7,210 6,200

TC 12,730 12,610 12,450 12,370 10,780 8,120

84 (28.9) SHC 5,840 5,790 5,740 5,700 5,150 4,240 88 (31.1) SHC 6,700 6,660 6,610 6,570 6,020 5,100

TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)

: Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB

(18.3) (23.9) (29.4) (35.0) (40.6) (46.1)

0.79 0.93 1.06 1.16 1.25 1.07

0.80 0.94 1.08 1.18 1.25 1.07

0.82 0.96 1.10 1.20 1.25 1.07

0.84 0.98 1.13 1.22 1.25 1.07

0.86 1.01 1.15 1.25 1.25 1.07

Indoor Unit : CS-KS18NB4UW & CZ-18BT1U

Outdoor Unit : CU-KS18NKU or CU-KS18NKUA

Power Supply : 230V Single Phase 60Hz

< Cooling Capacity >

RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 341 CFM

INDOOR OUTDOOR

ENT. TEMP.

WB DB 65 75 85 95 105 115

59 76 (24.4) SHC 10,330 10,470 10,600 10,730 10,930 9,010

(15.0) 80 (26.7) SHC 11,590 11,720 11,860 11,990 12,190 9,520

63 76 (24.4) SHC 11,590 11,390 11,190 11,000 9,540 7,480

(17.2) 80 (26.7) SHC 12,850 12,650 12,450 12,260 10,800 8,740

67 76 (24.4) SHC 9,870 9,740 9,540 9,340 7,880 6,020

(19.4) 80 (26.7) SHC 11,130 10,930 10,800 10,600 9,070 7,280

71 76 (24.4) SHC 7,950 7,880 7,750 7,610 6,090 4,430

(21.7) 80 (26.7) SHC 9,210 9,140 9,010 8,870 7,350 5,690

75 76 (24.4) SHC 6,160 6,090 5,960 5,890 4,430 2,970

(23.9) 80 (26.7) SHC 7,420 7,350 7,220 7,150 5,690 4,230

NOTE

Rating conditions (#)

Above data does not take Freeze Prevention Protection during cooling operation into account. For this reason, the value may vary from the actual cooling characteristics.

3. Above data represents the value when the operation frequency of a compressor is fixed.

F (oC) AMBIENT TEMP. oF (oC)

(18.3) (23.9) (29.4) (35.0) (40.6) (46.1)

TC 12,260 12,550 12,830 13,060 13,460 9,520

72 (22.2) SHC 9,140 9,270 9,400 9,540 9,740 7,810

84 (28.9) SHC 12,260 12,550 12,830 13,060 13,380 9,520 88 (31.1) SHC 12,260 12,550 12,830 13,060 13,460 9,520

TC 18,110 17,790 17,400 17,000 14,080 9,650

72 (22.2) SHC 10,400 10,200 10,000 9,800 8,340 6,290

84 (28.9) SHC 14,040 13,850 13,650 13,450 11,990 9,650 88 (31.1) SHC 15,240 15,110 14,840 14,640 13,180 9,650

TC 18,510 18,220 17,860 # 17,500 14,220 9,750

72 (22.2) SHC 8,680 8,480 8,340 8,140 6,620 4,830

84 (28.9) SHC 12,320 12,190 11,990 11,790 10,330 8,480 88 (31.1) SHC 13,510 13,380 13,180 12,980 11,530 9,670

TC 18,820 18,570 18,260 17,940 14,290 9,810

72 (22.2) SHC 6,750 6,690 6,550 6,420 4,900 3,240

84 (28.9) SHC 10,470 10,330 10,200 10,070 8,540 6,890 88 (31.1) SHC 11,660 11,530 11,390 11,260 9,740 8,080

TC 19,010 18,800 18,530 18,260 14,280 9,810

84 (28.9) SHC 8,610 8,540 8,410 8,340 6,890 5,430 88 (31.1) SHC 9,800 9,740 9,670 9,540 8,080 6,620

1.15 1.34 1.54 1.72 1.67 1.30

1.17 1.37 1.57 1.75 1.67 1.30

1.19 1.40 1.60 1.79 1.67 1.30

1.22 1.43 1.64 1.83 1.67 1.30

1.25 1.46 1.68 1.87 1.67 1.30

TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)

: Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB

5-3. Cooling Capacity (Low Ambient)

Indoor Unit : CS-KS12NB41 & CZ-18BT1U

Outdoor Unit : CU-KS12NK1A

Power Supply : 115V Single Phase 60Hz

< Cooling Capacity (Low Ambient) >

RATING CAPACITY: 11,900 BTU/h AIR FLOW RATE: 235 CFM

INDOOR OUTDOOR

ENT. TEMP.

WB DB 0 5 15 25 35 45 55

59 76 (24.4) SHC 7,800 7,800 7,850 9,450 7,850 7,850 7,850

(15.0) 80 (26.7) SHC 8,720 8,720 8,720 9,590 8,760 8,760 8,760

63 76 (24.4) SHC 6,520 6,520 6,570 9,450 6,610 6,610 6,660

(17.2) 80 (26.7) SHC 7,440 7,440 7,480 9,590 7,530 7,530 7,530

67 76 (24.4) SHC 5,240 5,240 5,290 9,450 5,380 5,420 5,420

(19.4) 80 (26.7) SHC 6,160 6,160 6,200 9,530 6,290 6,340 6,340

71 76 (24.4) SHC 3,870 3,920 3,960 9,380 4,100 4,140 4,140

(21.7) 80 (26.7) SHC 4,780 4,830 4,880 9,380 5,010 5,060 5,060

75 76 (24.4) SHC 2,590 2,640 2,730 9,160 2,860 2,910 2,960

(23.9) 80 (26.7) SHC 3,500 3,550 3,640 9,160 3,780 3,820 3,870

F (oC) AMBIENT TEMP. oF (oC)

(-17.8) (-15.0) (-9.4) (-3.9) (1.7) (7.2) (12.8)

TC 9,530 9,550 9,560 9,590 9,600 9,590 9,570

72 (22.2) SHC 6,930 6,930 6,980 8,580 6,980 6,980 6,980

84 (28.9) SHC 9,530 9,550 9,560 9,590 9,600 9,590 9,570 88 (31.1) SHC 9,530 9,550 9,560 9,590 9,600 9,590 9,570

TC 9,440 9,460 9,530 9,590 9,650 9,660 9,670

72 (22.2) SHC 5,650 5,650 5,700 8,580 5,740 5,740 5,790

84 (28.9) SHC 8,300 8,300 8,350 9,590 8,400 8,400 8,400 88 (31.1) SHC 9,170 9,170 9,220 9,590 9,270 9,270 9,270

TC 9,250 9,290 9,410 9,530 9,620 9,670 9,720

72 (22.2) SHC 4,370 4,370 4,420 8,580 4,510 4,560 4,560

84 (28.9) SHC 7,020 7,020 7,070 9,530 7,160 7,210 7,210 88 (31.1) SHC 7,890 7,890 7,940 9,530 8,030 8,080 8,080

TC 8,950 9,010 9,210 9,380 9,520 9,610 9,710

72 (22.2) SHC 3,000 3,050 3,090 8,580 3,230 3,280 3,280

84 (28.9) SHC 5,650 5,700 5,740 9,380 5,880 5,930 5,930 88 (31.1) SHC 6,520 6,570 6,610 9,380 6,750 6,800 6,800

TC 8,590 8,650 8,930 9,160 9,360 9,480 9,620

84 (28.9) SHC 4,370 4,420 4,510 9,160 4,650 4,690 4,740 88 (31.1) SHC 5,240 5,290 5,380 9,160 5,520 5,560 5,610

0.47 0.50 0.47 0.46 0.46 0.51 0.55

0.53 0.56 0.51 0.49 0.49 0.53 0.57

0.61 0.63 0.57 0.54 0.52 0.56 0.59

0.68 0.71 0.63 0.58 0.56 0.60 0.62

0.76 0.79 0.69 0.63 0.60 0.63 0.64

TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)

NOTE

Above data does not take Freeze Prevention Protection during cooling operation into account. For this reason, the value may vary from the actual cooling characteristics.

2. Above data represents the value when the operation frequency of a compressor is fixed.

Indoor Unit : CS-KS18NB4UW & CZ-18BT1U

Outdoor Unit : CU-KS18NKUA

Power Supply : 230V Single Phase 60Hz

< Cooling Capacity (Low Ambient) >

RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 341 CFM

INDOOR OUTDOOR

ENT. TEMP.

WB DB 0 5 15 25 35 45 55

59 76 (24.4) SHC 10,930 10,930 10,930 13,050 11,000 11,000 11,000

(15.0) 80 (26.7) SHC 12,190 12,190 12,190 13,470 12,190 12,260 12,190

63 76 (24.4) SHC 9,140 9,140 9,210 13,050 9,270 9,270 9,340

(17.2) 80 (26.7) SHC 10,400 10,400 10,400 13,480 10,530 10,530 10,600

67 76 (24.4) SHC 7,280 7,350 7,420 13,050 7,550 7,610 7,680

(19.4) 80 (26.7) SHC 8,540 8,610 8,680 13,380 8,810 8,870 8,870

71 76 (24.4) SHC 5,430 5,490 5,560 13,050 5,760 5,820 5,890

(21.7) 80 (26.7) SHC 6,690 6,690 6,820 13,160 7,020 7,080 7,150

75 76 (24.4) SHC 3,640 3,700 3,770 12,850 4,030 4,170 4,230

(23.9) 80 (26.7) SHC 4,900 4,960 5,030 12,850 5,290 5,360 5,490

F (oC) AMBIENT TEMP. oF (oC)

(-17.8) (-15.0) (-9.4) (-3.9) (1.7) (7.2) (12.8)

TC 13,400 13,430 13,440 13,470 13,500 13,520 13,510

72 (22.2) SHC 9,740 9,740 9,740 11,860 9,740 9,800 9,800

84 (28.9) SHC 13,380 13,380 13,380 13,470 13,380 13,450 13,450 88 (31.1) SHC 13,400 13,430 13,440 13,470 13,500 13,520 13,510

TC 13,260 13,300 13,370 13,480 13,560 13,640 13,670

72 (22.2) SHC 7,950 7,950 7,950 11,860 8,080 8,080 8,140

84 (28.9) SHC 11,590 11,590 11,590 13,480 11,720 11,720 11,790 88 (31.1) SHC 12,790 12,790 12,850 13,480 12,920 12,980 12,980

TC 12,980 13,040 13,170 13,380 13,530 13,670 13,760

72 (22.2) SHC 6,090 6,160 6,220 11,860 6,360 6,420 6,420

84 (28.9) SHC 9,740 9,800 9,870 13,380 10,000 10,070 10,070 88 (31.1) SHC 11,000 11,000 11,060 13,380 11,190 11,260 11,330

TC 12,550 12,630 12,830 13,160 13,390 13,600 13,750

72 (22.2) SHC 4,230 4,230 4,370 11,860 4,570 4,630 4,700

84 (28.9) SHC 7,880 7,950 8,010 13,160 8,210 8,280 8,340 88 (31.1) SHC 9,070 9,140 9,210 13,160 9,400 9,470 9,540

TC 12,010 12,110 12,380 12,850 13,150 13,440 13,650

84 (28.9) SHC 6,090 6,160 6,220 12,850 6,490 6,620 6,690 88 (31.1) SHC 7,280 7,350 7,420 12,850 7,680 7,810 7,880

0.69 0.73 0.76 0.66 0.66 0.66 0.70

0.78 0.82 0.84 0.71 0.70 0.69 0.72

0.89 0.92 0.93 0.78 0.75 0.72 0.75

1.00 1.03 1.03 0.85 0.80 0.76 0.77

1.11 1.14 1.13 0.92 0.86 0.80 0.80

TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)

NOTE

Above data does not take Freeze Prevention Protection during cooling operation into account. For this reason, the value may vary from the actual cooling characteristics.

2. Above data represents the value when the operation frequency of a compressor is fixed.

6. ELECTRICAL DATA

6-1. Electrical Characteristics

Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit

Cooling

Performance at 115V Single-phase 60Hz Rating conditions Running amp. 0.21

Rating conditions: Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB Outdoor air temperature: 95 °F (35 °C) DB

CU-KS12NK1A

Power input 18

Indoor Unit Outdoor Unit Complete Unit

Fan Motor Fan Motor + Compressor

12.39 1,242

12.6

1,260

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit

CU-KS18NKU

Cooling

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 230V Single-phase 60Hz Rating conditions Running amp. A 0.15

Power input W

Rating conditions: Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB Outdoor air temperature: 95 °F (35 °C) DB

8.15

1,838

Cooling

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 208V Single-phase 60Hz Rating conditions Running amp. 0.16

Power input 22

Rating conditions: Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB Outdoor air temperature: 95 °F (35 °C) DB

8.94

1,838

Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA

230V

Complete Unit

8.3

1,860

208V

Complete Unit

9.1

1,860

Cooling

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 230V Single-phase 60Hz Rating conditions Running amp. 0.15

Power input 22

Rating conditions: Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB Outdoor air temperature: 95 °F (35 °C) DB

8.15

1,838

Cooling

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 208V Single-phase 60Hz Rating conditions Running amp. 0.16

Power input 22

Rating conditions: Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB Outdoor air temperature: 95 °F (35 °C) DB

8.94

1,838

230V

Complete Unit

8.3

1,860

208V

Complete Unit

9.1

1,860

6-2. Electric Wiring Diagrams

Indoor Unit CS-KS12NB41 & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U

FLAP (R)

FLAP (W)

IND LAMP ASSY

COIL-1

BLK

COIL-1

WHT BRN

BLU

ORG

BLK

2P (RED)

ROOM

2P (YEL)

3P (RED)

FLAP

5P (WHT)

IND

7P (WHT)

4P (WHT)

8FA2-5250-46900-2

ROOM

BLK

VLT

BLU PNK YEL

ORG RED BRN

GRN BLK

WHT

BLK

BLK BLK

FLOAT SWITCH

THERMISTOR

ORG

BLU

BRN

WHT

BLK

WHT

BRN

BLU

ORG

BLK

TERMINAL BASE

2 3

TO OUTDOOR UNIT

BRN

DRAIN PUMP

FAN MOTOR

GND

RED

YEL

ORG

GRN/YEL

CORE

FERRITE

PNK

BLU

VLT

YEL/(RED)

BLU YEL

WHT

BLK

RED

1 2 3 4 5 6

RED

WHT

BLK

PWM/POW 7P (RED) PWM/POW 7P (RED) RC

3P (BLU)

DCM

6P (BLU)

AC1 AC2 SI

SERIAL

2P (WHT)

1 1

2 2

RED

WHT

1 1

2 2

SERIAL

2P (WHT)

3P (RED)

6P (WHT)

GRN

BOX BOX

CONTROLLER CONTROLLER

Outdoor Unit CU-KS12NK1A

8FA2-5251-12300-2

Outdoor Unit CU-KS18NKU CU-KS18NKUA

REACTANCE

BLU

RED(PINK)RED(PINK)

WHT

1 2

CORE

FERRITE

3P-CONNECTOR (WHT)

BLU

WHT

COMPRESSOR

MOTOR

ELEC SYSTEM ASSY

WHT WHT

1 2

(WHT)

WHT

2P-CONNECTOR

COMP A-TH

1 2 1 2

BLK

THERMISTOR

OVERLOAD RELAY

WHT

L1 L2 E1

CONTROLLER

1234 1 2 43

BLK

(OLR)

BLK

OUT DOOR

COIL/OUTDOOR

1234 1 2 43

YEL

THERMISTOR

COIL

THERMISTOR

DCFM MV0

2 3 4 5 6 7

BLK

WHT

1 2

3 4

WHT

FAN MOTOR

WHT WHT

5 6 7

BLK

1 2 4 5 6 73

7P-CONNECTOR (WHT)

1 2 3 4 5 1 2 43

YEL

BLU

RED

ORG

1 2123 4345

YEL

BLU

RED

MAGNETIC COIL

2P-CONNECTOR (RED)

GRN

E2 E

25A

ACIN1

ACIN2

SI-A

YEL

BLK

RED

GRY

MV0

GRN

WHT WHT

BLK

WHT

RED

BLK

POWER RELAY

BLK

TERMINAL

FERRITE CORE

BLK

WHT

HIGH PRESSURE

BLK

121 2

BLK

2P-CONNECTOR (BLK)

PLATE

GND

SUPPLY

GND

SWITCH

TO INDOOR UNIT

POWER

8FA2-5251-12000-2

7. MAINTENANCE

7-1. Address Setting of the Remote

Controller

The address can be set in order to prevent interference between remote controllers when two indoor units are installed near each other. The address is normally set to "A." To set a different address, it is necessary to change the address on the second remote controller.

NOTE

Once changed, you cannot restore the original address setting of the air conditioner.

(1) Switch on the power source. (2) Break the address-setting tab marked "A" on the

second remote controller to change the address (Fig. 1). When the tab is removed, the address is automatically set to B (Fig. 2).

(3) Press and hold the remote controller HIGH

POWER button and 1 HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After 5 seconds, release ACL button first, then release HIGH POWER and 1 HR. TIMER buttons, "oP-1" (test run) appears, blinking in the remote controller clock display area.

(4) Each time the 1 HR TIMER button is pressed, the

display changes as shown below. Press this button 2 times to change the display to "oP-7" (address setting). (Fig. 3)

Test run mode

Self-diagnostic mode

Address setting mode

HIGH POWER button

Ta b

Fig. 1

ACL button

Fig. 2

ON/OFF operation button

1HR. TIMER button

(5) "oP-7" has now been selected for address setting. (6) Press the ON/OFF operation button on the remote

controller. (Fig. 3) Check that the "beep" signal received sound is heard from the second indoor unit (approximately 5 times). The sound you hear is the signal that the remote controller address has been changed.

(7) Finally press the remote controller ACL (reset)

button to cancel the blinking "oP-7" display. (Fig.

3) Changing of the second remote controller address is now completed.

ACL (Reset) button

Fig. 3

7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit

One of the two types of connectors illustrated at left is used. Their basic structure is the same for each.

How to Disconnect

Hold the resin connector cover, and pull the connector off. You cannot disconnect the connector by pulling the wire since it is locked inside. Always hold the cover to disconnect. (See illustration at left.) For the connector without the resin cover,

Pull the cover upward

When the cover is pulled upward, the lock is released with the sequence of 1 and 2.

push the lock in the direction of "2" while pulling it off.

How to Connect

In order to connect, hold the resin cover of the connector and push it in. Confirm the click sound for the inside lock.

7-3. Disassembly Procedure

To avoid electrical shock hazard, be sure to disconnect power before

WARNING

7-3-1. Remove the air intake grill.

(1) Slide the 2 latches each to the corresponding arrow direction. (Fig. 1 and Fig. 2)

Open downward the air intake grill located on the latch side.

(2) Undo the air intake grill drop preventive hook. (Fig. 3)

Undo the 2 hinges for the grill and remove the air intake grill.

attempting to disassemble the unit.

When a footstool, etc. is used for disassembling the indoor unit,

be careful not to fall down. If you fall down, you might be injured seriously.

Latch

Hinge

Latch

Air intake grill

Fig.1

Hinge

Fig.2 Fig.3

7-3-2. Disconnect the connectors in the control box.

(1) Remove the 2 screws and remove the control box cover. (Fig. 4)

(2) Disconnect the connectors CN04 (FLAP 5P), CN12 (RC 4P) and CN13 (IND 7P). (Fig. 5)

Hook

CN04

Control PCboard

Screw Control box cover

Fig.4 Fig.5

CN13

CN12

7-3-3. Remove the ceiling panel.

(1) Open the clamp (4 locations) and remove the 2 lead wires from the clamps. (Fig. 6)

(2) Remove the 4 screws fixing the corner cover (at 3 locations) and indicator cover (at 1 location). (Fig. 6)

(3) Press the center 1 of the cover and remove the cover with the section 2 pulled down. (Fig. 7)

(4) Remove the strap (3 locations) from the hook on the ceiling panel. (Fig. 8)

NOTE

(5) Remove the bolt (4 locations) with a washer and remove the ceiling panel. (Fig. 9)

There is no strap on the indicator cover.

Indicator cover

Screw

Clamp

Corner cover

Lead wire

Clamp

Corner coverCorner cover

Pull down section 2.

Fig.6 Fig.7

Bolt

Cover

Center 1

Strap

Remove the strap from the hook.

Bolt

Fig.8 Fig.9

7-3-4. Remove the indoor air temperature sensor.

(1) Disconnect the connector CN08 (ROOM 2P) in the control box and remove the indoor air temperature

sensor. (Fig. 10)

Indoor air temperature sensor

Fig.10

7-3-5. Remove the power box and control box.

(1) Remove a screw and remove the terminal cover. (Fig. 11)

(2) Remove the 2 screws and remove the power box cover. (Fig. 11)

(3) Disconnect the power lines (No. 1 and No. 2) / signal line (No. 3) and ground cable from the terminals in

the power box. (Fig. 12)

CN08

Terminal cover

Screw

Power box cover

Ground cable

Fig.11

Terminal

Fig.12

Power lines / Signal line

(4) Disconnect the connector CN07 (DP 2P) in the power box. (Fig. 13)

Remove a screw and disconnect the ground cable. (Fig. 13)

(5) Disconnect the connector CN03 (DCM 6P) in the power box. (Fig. 14)

(6) Remove the 4 screws and remove the power box. (Fig. 14)

(7) Disconnect the connectors CN06 (FS 3P) and CN09 (COIL-1 2P) in the control box. (Fig. 15)

(8) Remove the 2 screws and remove the control box. (Fig. 15)

Screw

Ground cable

Screw

12 3

CN07

Fig.13

Screw

CN03

Fig.14

Screw

CN09

Screw

CN06

Fig.15

NOTE

For the removal of the following components, perform any work after removing the indoor

unit (main body) from the ceiling.

Main body lower section Heat exchanger sensor Drain pump

Float switch Turbo fan Fan motor

Heat exchanger

1. Perform the work after draining the water to prevent the water leakage from the drain pan.

• Put a bucket, etc., under the drain cap and remove the drain cap to drain the water.

(Fig. 16)

2. Refer to the installation instructions for recovery of refrigerant or removal of the power

cable or tubing.

7-3-6. Remove the main body lower section.

(1) Remove the 4 screws. (Fig. 16)

(2) Remove the 2 screws. (Fig. 17)

(3) Disconnect the connector CN03 (DCM 6P) in the power box. (Fig. 18)

(4) Lift the main body lower section and remove it from the main body upper section.

Screw

Drain cap

Main body lower sectionMain body lower section

Screw

Fig.16

Main body lower section

Main body upper section

Screw

CN03

Fig.18Fig.17

7-3-7. Remove the heat exchanger sensor.

(1) Remove the heat exchanger sensor from the sensor holder. (Fig. 19)

Fig.19

7-3-8. Remove the drain pump and float switch.

(1) Remove the 2 screws (Fig. 20)

(2) Loosen the clamp and disconnect the drain hose from the drain pump. (Fig. 20)

(3) Remove the drain pump from the main body upper section. (Fig. 20)

(4) Remove a nut and remove the float switch. (Fig. 21)

Heat exchanger sensor

Holder

Drain pump

Screw

Float switch

Nut

Drain hose

Clamp

Fig.20 Fig.21

7-3-9. Remove the turbo fan and fan motor.

(1) Remove a nut and remove the turbo fan. (Fig. 22)

(2) Remove the 2 screws and 3 nuts, and remove the fan motor. (Fig. 23)

Turbo fan

Fig.22 Fig.23

7-3-10. Remove the heat exchanger.

(1) Remove the 3 screws. (Fig. 24)

(2) Remove the 3 screws. (Fig. 25)

(3) Remove the heat exchanger from the main body upper section with the heat exchanger lifted.

Nut

Screw Nut

Fan motor

ScrewHeat exchanger

Screw

Fig.24 Fig.25

Main body upper section

Screw

8. FUNCTIONS

8-1. Operation Functions

Emergency operation SENSOR DRY

Emergency operation is available when the remote controller malfunctions, has been lost, or otherwise cannot be used.

To operate the system, press the OPERATION button, which is also used as the receiver, below the unit display. Each time this button is pressed, the OPERATION lamp changes color to indicate the type of operation. Select the desired type of operation.

COOL STOP

(GREEN) (Lamp Off)

The set temperature is 4°F(2°C) below the detected room

temperature in the case of cooling operation.

During DRY operation, the system adjusts the room

temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment.

SENSOR DRY operation

DRY operation is as shown in the figure below.

Load

COOL zone

A zone

B zone

Conditions are monitored at all times when the room temperature is below 59°F(15°C).

DRY A

The compressor operation frequency varies. The indoor fan operates with 1/f fluctuation.

DRY B

The compressor operates at a low operating frequency. The indoor fan operates with 1/f fluctuation.

Monitor

Monitoring operation takes place when the room temperature

is below 59°F temperature.

When the monitoring range is entered, the compressor stops,

and the indoor fan operates with 1/f fluctuation.

NOTE

The Sensor Dry operation during the Low Ambient Cooling Mode (outside air temperature:59°F(15°C) or lower) is as follows.

DRY A

The compressor operates a cycle of 3 minutes ON and 6 minutes OFF repeatedly.

(15°C), or more than 5°F(3°C) below the set

(CLxx models only)

DRY Band

PAM- control

In order to further improve inverter performance, control is

switched between PWM control at low operation speeds, and PAM control at high operation speeds, making the most effective use of power.

HIGH POWER

NIGHT SETBACK

This function acts to raise the power but keeps the AC system in the same operating mode. This function is set with the HIGH POWER button on the remote controller. (It can be set regardless of the temperature and fan speed settings.)

HIGH POWER operation from remote controller The unit operates at maximum output for 30 minutes,

regardless of the desired temperature.

The fan speed is 1 step above "High."

Frequency

MAX

30 min. 5 min.

Start End

Time

NOTE

When HIGH POWER operation ends, the unit operates at low

Hz for 5 minutes, regardless of the thermostat OFF conditions.

When in DRY mode, operation is in the cooling zone.

When NIGHT SETBACK operation is set, the temperature and

fan speed settings will be adjusted automatically to allow comfortable sleep.

When NIGHT SETBACK operation is set, " mark" appears on

the remote controller. The main unit display lamp also becomes dimmer.

COOL and DRY modes

When the night setback mode is selected, the air conditioner automatically raises the temperature setting 2°F(1°C) when 30 minutes have passed after the selection was made, and then another 2°F(1°C) after another 30 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle cooling is needed.

Setting temperature

Press the NIGHT SETBACK button

2°F(1°C)

30 min. 30 min.

Time

Lamp colors

OPERATION lamp

DRY operation Orange COOL operation Green FAN operation Green

OPERATION lamp Green

TIMER lamp Green

HIGH POWER lamp Green

Timer backup

Operation stops if there are no operator controls for 25 hours or

longer after unit operation switched from OFF to ON by use of ON timer operation.

8-2. Protective Functions

Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

Freeze-prevention operation is engaged when the

temperature of the indoor heat exchanger is below 43°F(6°C).

Restart after freeze-prevention operation occurs when the

temperature of the indoor heat exchanger reaches 46°F(8°C) or above.

46 (8)

43 (6)

36 (2)

temperature °F(°C)

Indoor heat exchanger

Area: Automatic capacity control

When the temperature drops below Point A, the operation

abcd

frequency is reduced by a certain proportion.

Area: Frequency increase is prohibited.

When the temperature reaches Point C or above, freezing

prevention is ended and control is the same as in the

area.

Compressor discharge temperature control

This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature.

Compressor discharge temperature °F(°C)

Approx.

214

(101)

Approx.

201 (94)

Area: Automatic capacity control.

When the temperature rises above Point A, the operation

abc d

frequency is reduced at a specified rate.

Area: Further frequency increase is prohibited.

When the temperature falls below Point B, prevention of a rise

in frequency is released and the air conditioner operates as in

area.

* The compressor will stop if the temperature of the compressor

discharge exceeds 248°F(120°C) due to shortage of gas or other reason.

* When the temperature drops to below 36°F(2°C)

(continuously for 2 minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

NOTE

The Freeze Prevention Control during the Low Ambient Cooling Mode (outside air temperature:59 The compressor stops when the temperature of indoor heat exchanger becomes less than 36°F(2°C). The compressor restarts when the temperature of indoor heat exchanger becomes 46°F(8°C) or higher.

(CLxx models only)

°F(15°C)

or lower) is as follows.

CT (Peak current cut-off control)

This function prevents the circuit breaker or fuse from operating to open the circuit. This function works when electrical current has increased due to an increase in the cooling load, or to a decrease in the power supply voltage. In these cases, operation frequency is reduced or operation is interrupted automatically to control the electrical current for operation.

When the cause of the increase in electrical current is rectified, the system will resume operation in the original mode.

(A)<CS-KS12NB41>

Cooling Dry

Peak current cut-off trips 22.5

Hz down 14.0

(A)<CS-KS18NB4UW>

Cooling Dry

Peak current cut-off trips 17.5

Hz down 11.0

9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)

9-1. Precautions before Performing Inspection or Repair

After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.

High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be careful not to touch any electrified parts before the controller LED (red) turns OFF.

If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.

9-2. Method of Self-Diagnostics

Follow the procedure below to perform detailed trouble diagnostics.

NOTE

1: If the operation lamp blinks every 0.5 seconds immediately when the

power is turned ON, there is an external ROM (OTP data) failure on the indoor circuit board, or a ROM socket insertion problem, or the ROM has not been installed.

2: The failure mode is stored in memory even when the power is not ON.

Follow the procedure below to perform diagnostics.

PROCEDURE

After turning on power to the air conditioner, use the remote controller and follow the steps below to execute self-diagnostics.

Step 1: Press and hold the remote controller HIGH POWER button and 1

HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After 5 seconds, release ACL button first, then release HIGH POWER and 1 HR TIMER buttons, "oP-1" (test run) appears, blinking in the remote controller clock display area.

Step 2: Next, press the 1 HR TIMER button once to change the display

from "oP-1" to "oP-3" (self-diagnostics). (The display continues to blink.)

Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.

< Clock display >

Test run mode

Self-diagnostics mode

ON/OFF operation button

HIGH POWER button

1HR. TIMER button

• The self-diagnostics function utilizes the 3 indicator lamps on the main unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to report the existence of sensor trouble or a protective operation. (The lamps blink or remain ON for 5 seconds, then turn OFF for 2 seconds.) Self-diagnostics is completed when the buzzer sounds 3 short beeps.

• A maximum of 3 self-diagnostics reports are displayed, for 5 seconds each, beginning with the most recent report. Following this display the lamps turn OFF. In order to view the self-diagnostics results again, press the ON/OFF button again.

• The 3 lamps remain OFF if no trouble has occurred.

<IMPORTANT> After self-diagnostics is completed, be sure to press the

ACL (reset) button to return to normal mode. The air conditioner will not operate if this is not done.

ACL (Reset) button

(1) Self-diagnostics Lamps

INDOOR UNIT

OPERATION button

OPERATION lamp

TIMER lamp

HIGH POWER lamp

REMOTE CONTROL receiver

Since the indications cover various units, the corresponding parts listed below may not be present in some models.

INDICATION ON INDOOR UNIT

OPERATION

TIMER

HIGH POWER

....

OFF

CODE DIAGNOSIS CONTENTS POSSIBLE MALFUNCTION

S01

ROOM TEMP. SENSOR TROUBLE

I/D HEAT EXCHANGER TEMP.

S02

SENSOR TROUBLE

COMPRESSOR TEMP. SENSOR

S04

TROUBLE

O/D HEAT EXCHANGER TEMP.

S05

SENSOR TROUBLE

O/D AIR TEMP. SENSOR TROUBLE

S06

O/D CURRENT SENSOR ERROR

S07

I/D-O/D COMMUNICATION TROUBLE

E01

(SERIAL COMMUNICATION TROUBLE)

HIC CIRCUIT TROUBLE

E02

POWER TR CIRCUIT TROUBLE

O/D UNIT EXTERNAL ROM

E03

TROUBLE

E04

CURRENT PEAK CUT

PAM CIRCUIT TROUBLE

E05

ACTIVE CIRCUIT TROUBLE

COMPRESSOR DISCHARGE TEMP.

E06

OVERHEATING PREVENTION

I/D FAN OPERATION TROUBLE

E07

4-WAY VALVE SWITCHING TROUBLE

E08

ZERO-CROSS TROUBLE

GAS-LOSS PREVENTION

E09

DC COMPRESSOR DRIVE

E10

CIRCUIT TROUBLE

E11

O/D DC FAN OPERATION TROUBLE

O/D SYSTEM COMM FAILURE, OLR OPERATION, O/D POWER

E12

OPEN PHASE, O/D FREEZING

FREEZING-PREVENTION OPERATION

E13

(1) OPEN OR SHORT CIRCUIT IN SENSOR (2) POOR CONTACT AT CONNECTOR OR OPEN CIRCUIT AT TERMINAL PRESS-FIT LOCATION. (3) I/D PCB FAILURE (I/D = INDOOR)

(1) OPEN OR SHORT CIRCUIT IN SENSOR (2) POOR CONTACT AT CONNECTOR OR OPEN

CIRCUIT AT TERMINAL PRESS-FIT LOCATION

(3) O/D PCB FAILURE (O/D = OUTDOOR)

O/D PCB FAILURE

(1) MIS-WIRING (2) AC POWER FAILURE (3) BLOWN FUSE (4) POWER RELAY FAILURE (5) I/D OR O/D PCB FAILURE (6) O/D FAN MOTOR FAILURE (7) REACTOR FAILURE (8) HIGH-PRESSURE SW FAILURE (9) OLR FAILURE (10) MAGNETIC COIL FAILURE (1) HIC OR POWER TR FAILURE (2) O/D FAN NOT OPERATING (3) INSTANTANEOUS POWER STOPPAGE (4) SERVICE VALVE NOT OPENED (5) O/D FAN BLOCKED (6) CONTINUOUS OVERLOAD OPERATION (7) COMPRESSOR FAILURE (8) O/D PCB FAILURE

(1) EXTERNAL ROM DATA FAILURE (2) O/D PCB FAILURE

(1) INSTANTANEOUS POWER STOPPAGE (2) HIC OR POWER TR FAILURE (3) O/D PCB FAILURE

(1) O/D PCB FAILURE (2) O/D POWER VOLTAGE TROUBLE

(1) ELECTRIC EXPANSION VALVE FAILURE (2) CHOKED CAPILLARY TUBE (3) INSUFFICIENT GAS (4) CONTINUOUS OVERLOAD OPERATION (5) O/D FAN NOT OPERATING (6) O/D PCB FAILURE

(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE (3) I/D PCB FAILURE

(1) 4-WAY VALVE FAILURE (HEAT PUMP MODEL ONLY) (2) O/D PCB FAILURE

(1) SERVICE VALVE NOT OPENED (2) INSUFFICIENT GAS

(1) OPEN PHASE (2) O/D PCB FAILURE

(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE (3) O/D PCB FAILURE

(1) MIS-WIRING (2) BLOWN FUSE (3) POWER RELAY FAILURE (4) O/D PCB FAILURE (5) COMPRESSOR FAILURE

(1) I/D FAN SYSTEM TROUBLE (2) INSUFFICIENT GAS (3) OPERATION AT LOW TEMPERATURE

....

BLINKING

....

TIMER

LAMP

BLINKING (3 SEC. INTERVAL)

FLOAT SWICTH (FS) IS ACTIVED.

(1) DRAIN PUMP FAILURE (2) FS FAILURE (3) CHOKED DRAIN HOSE

8512-5261-99100-1

(2) If the self-diagnostics function fails to operate

No indicators illuminate and the

•

Check the indoor unit.

indoor fan does not rotate. Check the power voltage.

•

Is the fuse blown?

Normal

Replace the circuit

Replace the controller.

board or the fuse.

9-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

ControlNo. Check items (unit operation)

The rated voltage must be present between inter-unit wirings 1 and 2.

Use the remote controller to operate the

unit in "TEST run" mode. To determine whether the mode is currently in "TEST run" mode, check the 3 indicator lamps on the unit. If all 3 are blinking, the current mode is "TEST run."

If there are no problems with the above, then check the outdoor unit. For the "Test run" procedure, refer to the Appendix B "Installation Instructions".

•

Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the

•

voltage at both ends is measured, approximately 12 to 15V DC must be output and the multimeter pointer must bounce once every 8 seconds. Or instead of measuring the voltage, you can insert an LED jig and check that the LED flickers once every 8 seconds.

Blown

(2) Checking the outdoor unit

ControlNo. Check items (unit operation)

Apply the rated voltage between outdoor

1 The control panel LED (red) must illuminate.

unit terminals L and N.

Short-circuit the outdoor unit COM terminal

2 The compressor, fan motor and 4-way valve must all turn on.

to the T-RUN terminal.

If there are no problems with the above, then check the indoor unit.

Using the TEST/T-RUN terminals

•

TEST/T-RUN terminals

T-RUN : Test run (compressor and fan motor turn ON). TEST/MV : Compresses time to 1/60th (accelerates

operation by 60 times faster than normal).

(TEST)/MV T-RUN COM

(3) Serial Communication Error Identification Procedure

If the lamps on the main body show the following conditions after the completion of self-diagnostics,

a communication error between the indoor unit and outdoor unit might be considered.

In such a case, identify the breakdown section by using the following procedure.

NOTE

Condition

Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.

Lamp TimerOperation

High Power

: Off

: Blinking

E01

: Illuminated

E12

< Before the Operation >

For terminal strip short circuit work or inter-unit wiring removal, turn off the power to

WARNING

avoid an electric shock. Release the terminal strip short circuit after the completion of self-diagnostics.

Do not perform the short-circuit work between any other terminals except for

CAUTION

specified ones on the specified terminal strip. If such work is performed between the incorrect terminals, the unit might be broken.

< Convenient Tool for Short-Circuit Work ( for example ) >

Alligator Clip

Cable

Alligator Clip

< Check Items before Troubleshooting Serial Communication Start >

After confirming that the following errors do not exist, start the "Troubleshooting Serial Communication" in "Condition: E01 and E12".

1. Mis -wiring (inter-unit cable, etc.)

2. AC power failure

3. Blown fuse

4. Power Relay failure

5. Outdoor Fan Motor failure (defective insulation, etc.)

(3-1) Condition: E01

Troubleshooting Serial Communication

Is the voltage of about DC12V

or more given between the terminals

2 and 3 on the outdoor unit terminal strip

(Serial Communication Line) ?

(Fig. 1)

Yes

6. Reactor failure (defective insulation, etc.)

7. High-Pressure Switch failure

8. Overload Relay failure

9. Magnetic Coil failure (defective insulation, short-circuit, etc.)

10. Compressor failure (defective insulation, etc.)

Outdoor Unit

1 2 43 5 6

Power

1 2 3

Indoor Unit

Fig. 1

1. Turn OFF the power and wait until the power lamp (LED)

of the outdoor unit controller is turned OFF.

2. Disconnect the cable from the terminal 3 on the indoor unit terminal strip. (Fig. 2)

3. Turn ON the power.

1 2 43 5 6

1 2 3

Indoor Unit

Outdoor Unit

Power

Fig. 2

( Continued to the next page A. )

( Continued to the next page B. )

( Continued from the previous page A. )

( Continued from the previous page B. )

Defect or connection error

in the inter-unit cable

1. Turn OFF the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2. Short-circuit between the terminals 2 and 3 on the outdoor unit terminal strip. (Fig. 3)

1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2. Perform the self-diagnosis five seconds after the operation start.

What is the latest self-diagnosis result ?

Yes

Condition: E12

Is the voltage of about DC22V to 24V given between the terminals

2 and 3 on the indoor unit terminal strip

(Serial Communication Line) ?

(Fig. 2)

Defect in the indoor unit

P.C. board

Outdoor Unit

1 2 43 5 6

Powe r

1 2 3

Indoor Unit

Fig. 3

Defect in the outdoor unit

P.C. board.

Condition: E01

1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2. Remove the short-circuit between the terminals 2 and 3 on the outdoor unit terminal strip.

3. Disconnect the cable from the terminal 3 on the indoor unit terminal strip. (Fig. 4)

Short-circuit between the terminals 2 and 3 on the indoor unit terminal board. (Fig. 5)

1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2. Perform the self-diagnosis five seconds after the operation start.

What is the latest self-diagnosis result ?

Condition: E01

1 2 43 5 6

1 2 3

Indoor Unit

Condition: E12

Outdoor Unit

Powe r

Fig. 4

Defect or connection error

in the inter-unit cable

Outdoor Unit

1 2 43 5 6

Powe r

1 2 3

Indoor Unit

Fig. 5

Defect in the indoor unit

P.C. board

(3-2) Condition: E12

Troubleshooting Serial Communication

1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2. Disconnect the cable from the terminal 3 on the Outdoor unit terminal strip. (Fig. 6)

1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2. Perform the self-diagnosis five seconds after the operation start.

What is the latest self-diagnosis result ?

Condition: E12

1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2. Disconnect the cable from the terminal 3 on the indoor unit terminal strip. (Fig. 7)

1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2. Perform the self-diagnosis five seconds after the operation start.

Outdoor Unit

1 2 43 5 6

Powe r

1 2 3

Indoor Unit

Fig. 6

Condition: E01

Defect in the outdoor unit

P.C. board

Outdoor Unit

1 2 43 5 6

Powe r

1 2 3

Indoor Unit

Fig. 7

What is the latest self-diagnosis result ?

Condition: E12

Defect in the indoor unit

P.C. board

Condition: E01

Defect in the inter-unit

cable

9-4. Trouble Diagnosis of Fan Motor

9-4-1. Indoor Fan Motor

This indoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.

Important:

[Trouble symptom 1] The fan does not stop when the unit stops. Indoor unit controller trouble.

[Trouble symptom 2] The fan motor does not rotate when the unit is operating.

(Diagnostic procedure)

(Diagnostic results)

(Reference) DC motor connector pin arrangement

Pin 1: Vm (red) Pin 2: Not used Pin 3: Gnd (black) Pin 4: Vcc (white) Pin 5: Vs (yellow) Pin 6: PG (blue)

(A) Turn OFF the power before connecting or disconnecting the motor connectors. (B) When performing voltage measurement at the indoor controller connector for (3) in the table

below, the DC motor will trip and voltage output will stop approximately 1 minute after operation is started. For this reason, to measure the voltage again, turn OFF the unit once using the remote controller, and then start the air conditioner again.

* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor

unit controller (3 locations).

Measurement location

CS-KS12NB41 (1) Vm-Gnd: Between pin 1 and pin 3 (2) Vcc-Gnd: Between pin 4 and pin 3 (3) Vs-Gnd: Between pin 5 and pin 3

All of the above measured values are normal. Fan motor trouble (Replace the motor.) Any one of the above measured values is not normal. Indoor unit controller trouble (Replace the controller .)

DC 130V to 195V

Fluctuation between DC 1.8V to 5.7V

Normal value

CS-KS18NB4UW DC 280V to 340V

DC 15V +/- 10%

[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit

operates. (There is trouble in the system that provides feedback of motor rotation speed from the motor to the indoor unit controller.)

[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.

[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.

(Remedy for symptom 3 to 5)

It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble. Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.

9-4-2. Outdoor Fan Motor

This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. Perform the trouble diagnosis by Test Run mode described on Installation Instructions.

Important:

[Trouble symptom 1] The fan does not stop when the outdoor unit stops. Outdoor unit controller trouble

[Trouble symptom 2] The fan motor does not rotate when the outdoor unit is operating.

(Diagnostic procedure)

(Diagnostic results)

(Reference) DC motor connector pin arrangement

Pin 1: Vs (white) Pin 2: Not used Pin 3: Not used Pin 4: Gnd (black) Pin 5: Vcc (red) Pin 6: FG (blue) Pin 7: Vsp (yellow)

(A) Turn OFF the power before connecting or disconnecting the motor connectors. (B) When performing voltage measurement at the outdoor controller connector for (3) in the table

below, the DC motor will trip and voltage output will stop approximately 10 seconds after operation is started. For this reason, to measure the voltage again, first turn OFF the outdoor unit power, then, measure the voltage in Test Run mode.

* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor

unit controller (3 locations).

Measurement location

(1) Vs-Gnd: Between pin 1 and pin 4 (2) Vcc-Gnd: Between pin 5 and pin 4 (3) Vsp-Gnd: Between pin 7 and pin 4

All of the above measured values are normal. Fan motor trouble (Replace the motor.) Any one of the above measured values is not normal. Outdoor unit controller trouble

DC 110V or more DC 14V or more After fluctuating 4 times between DC 1.0 to 4.3V (1 sec. ON) and DC 0 V (1 sec. OFF), the DC motor trips.

(Replace the controller .)

Normal value

[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the outdoor

unit operates. (There is trouble in the system that provides feedback of motor rotation speed from the motor to the outdoor unit controller.)

[Trouble symptom 4] Fan motor rotation speed does not change during outdoor unit operation.

[Trouble symptom 5] Fan motor rotation speed varies excessively during outdoor unit operation.

(Remedy for symptom 3 to 5)

It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble. Therefore, first replace the outdoor unit controller, then (if necessary) replace the DC motor.

9-5. Noise Malfunction and Electromagnetic Interference

An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices.

A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur. Please pay attention to the points listed below.

(1) Noise malfunction

This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.

Locations most susceptible to noise

1. Locations near broadcast stations where there are strong electromagnetic waves

2. Locations near amateur radio (short wave) stations

3. Locations near electronic sewing machines and arc-welding machines

Trouble

Either of the following trouble may occur.

1. The unit may stop suddenly during operation.

2. Indicator lamps may flicker.

(The fundamental concept is to make the

system less susceptible to noise.)

distance from the noise source. -

1. Use shielded wires.

2. Move unit away from the noise source.

Correction

- Insulate for noise or

(2) Electromagnetic interference

This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.

Locations most susceptible to noise

1. A television or radio is located near the A/C and A/C wiring.

2. The antenna cable for a television or radio is located close to the A/C and A/C wiring.

3. Locations where television and radio signals are weak.

Trouble

1. Noise appears in the television picture, or the picture is distorted.

2. Static occurs in the radio sound.

1. Select a separate power source.

2. Keep the A/C and A/C wiring at least 1 meter away from wireless devices and antenna cables.

3. Change the wireless device’s antenna to a high-sensitivity antenna.

4. Change the antenna cable to a BS coaxial cable.

5. Use a noise filter (for the wireless device).

6. Use a signal booster.

Correction

10. CHECKING ELECTRICAL COMPONENTS

10-1. Measurement of Insulation

Resistance

The insulation is in good condition if the resistance exceeds 1M ohm.

Clip

Ground wire

10-1-1. Power Supply Cord

Clamp the grounding wire of power cord with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the two power wires. (Fig. 1) Then also measure the resistance between the grounding and other power terminals. (Fig. 1)

10-1-2. Indoor Unit

Clamp an aluminum plate fin or copper tube with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw on the terminal plate. (Fig. 2) Note that the ground line terminal should be skipped for the check.

10-1-3. Outdoor Unit

Clamp a metallic part of the unit with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw where power supply lines are connected on the terminal plate. (Fig. 2)

Probe

Copper tube or metallic part

Insulation tester

Fig. 1

Terminal plate

Probe

Clip

Insulation tester

Fig. 2

Probe

10-1-4. Measurement of Insulation

Resistance for Electrical Parts

Disconnect the lead wires of the desired electric part from terminal plate, capacitor, etc. Similarly disconnect the connector. Then measure the insulation resistance. (Figs. 3 and 4)

NOTE

Refer to Electric Wiring Diagram. If the probe cannot enter the poles because the hole is too narrow then use a probe with a thinner pin.

Copper tube or metallic part

Metallic part

Clip

Insulation tester

Fig. 3

From fan motor, compressor and other parts

Probe

Fig. 4

Insulation tester

10-2. Checking Continuity of Fuse

on PCB Ass'y

Remove the PCB Ass'y from the electrical component box. Then pull out the fuse from the PCB Ass'y. (Fig. 5)

Check for continuity using a multimeter as shown in Fig. 6.

Fuse

PCB Ass'y

Fig. 5

Fuse

Fig. 6

11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT

11-1. Characteristics of New Refrigerant R410A

11-1-1. What is New Refrigerant R410A?

R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.

11-1-2. Components (mixing proportions)

HFC32 (50%) / HFC125 (50%)

11-1-3. Characteristics

Less toxic, more chemically stable refrigerant

The composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase. Thus, when there is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change in composition of the remaining refrigerant. Therefore, do not add new refrigerant. Instead, recover the remaining refrigerant with the refrigerant recovery unit. Then, after evacuation, totally recharge the specified amount of refrigerant with the new refrigerant at its normal mixed composition state (in liquid phase).

When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or liquid phase, and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is in gaseous state. Thus, always charge the refrigerant while it is in liquid phase.

CAUTION

Ether-type oil is used for compressor oil for R410A-type units, which is different from the mineral oil used for R22. Thus more attention to moisture prevention and faster replacement work compared with conventional models are required.

11-2. Checklist before Servicing

Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer.

Diameter of tube D

Dia.1/4" (6.35 mm)

Dia.3/8" (9.52 mm)

Dia.1/2" (12.7 mm)

Dia.5/8" (15.88 mm)

Size of flare

Tubing precautions

Specification A

Flare tool for R410A Conventional flare tool (for R22)

0 to 0.0196"

(0 to 0.5 mm)

Flare tool for R410A

Conventional flare tool (R22)

0.0472"

(1.2 mm)

Spacer

Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily cover the ends of the tubing with caps or tape prior to installation.

Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since air conditioners with R410A are subject to higher pressure than those using R22 and R407C.

No addition of compressor oil for R410A

No additional charge of compressor oil is permitted.

No use of refrigerant other than R410A

Never use a refrigerant other than R410A.

If refrigerant R410A is exposed to fire

Through welding, etc., toxic gas may be released when R410A refrigerant is exposed to fire. Therefore, be sure to provide ample ventilation during installation work.

Caution in case of R410A leak

Check for possible leak points with the special leak detector for R410A. If a leak occurs inside the room, immediately provide thorough ventilation.

11-3. Tools Specifically for R410A

For servicing, use the following tools for R410A

Tool Distinction Tool Name

Gauge manifold

Charging hose

Gas leak detector

Refrigerant cylinder

Charging cylinder

Refrigerant recovery unit

Tools specifically for R410A

Vacuum pump with anti-reverse flow (*1)

(Solenoid valve-installed type, which prevents oil from flowing back into the

unit when the power is off, is recommended.)

Vacuum pump (*2)...can be used if the following adapter is attached.

Vacuum pump adapter (reverse-flow prevention adapter) (*3).

(Solenoid valve-installed adapter attached to a conventional vacuum pump.)

Electronic scale for charging refrigerant

Flare tool

Bender

Tools which can be com-

monly used for R22,

R407C, and R410A

CAUTION

To prevent other refrigerants (R22, R407C) from being mistakenly charged to this unit, shape and external diameter of the service port screw has been altered. <External diameter of service port> R410A : 5/16" R22, R407C : 1/4"

The above tools specifically for R410A must not be used for R22 and R407C. Doing so will cause malfunction of the unit.

For the above vacuum pump (*1, *2) and vacuum pump adapter (*3), those for R22-type units can be used for R410A-type. However, they must be used exclusively for R410A and never alternately with R22 and R407C.

Torque wrench

Cutter, reamer

Welding tool, nitrogen gas cylinder

11-4. Tubing Installation Procedures

When the tubes are connected, always apply HAB oil on the flare portions to improve the sealing of tubing.

The following is the HAB oil generally used:

Esso: ZERICE S32

NOTE

For details on tubing installation procedures, refer to the installation manuals attached to the indoor unit and outdoor unit.

11-5. In Case of Compressor Malfunction

CAUTION

Should the compressor malfunction, be sure to make the switch to a replacement compressor as quickly as possible.

Use only the tools indicated exclusively for R410A. See "11-3. Tools Specifically for R410A."

11-5-1. Procedure for Replacing Compressor

(1) Recovering refrigerant

Any remaining refrigerant inside the unit should not be released to the atmosphere, but recovered using the refrigerant recovery unit for R410A.

Do not reuse the recovered refrigerant, since it will contain impurities.

(2) Replacing Compressor

Soon after removing seals of both discharge and suction tubes of the new compressor, replace it quickly.

(3) Checking for sealing

Use nitrogen gas for the pressurized gas, and never use a refrigerant other than R410A. Also do not use oxygen or any flammable gas.

(4) Evacuation

(1) Recover refrigerant

(2) Replace compressor

(3) Check for sealing

Use a solenoid valve-installed vacuum pump so that even if power is cut off in the middle of evacuation of air due to a power interruption, the valve will prevent the pump oil from flowing back.

The equipment may be damaged if moisture remains in the tubing, thus carry out the evacuation thoroughly.

When using a vacuum pump with exhaust air volume more than 0.883 cu.ft./min. and ultimate vacuum pressure rate of 50 micron Hg.

Standard time for evacuation

Length of tubing

Evacuation time

Less than 33 ft. (10 m)

More than 10 minutes

(4) Evacuation

(5) Recharge

More than 33 ft. (10 m)

More than 15 minutes

(5) Recharging

Configuration and characteristics of cylinders

Be sure to charge the specified amount of refrigerant in liquid state using the service port

of the wide tube service valve. The proper amount is listed on the unit's nameplate.

When the entire amount cannot be charged all at once, charge gradually while operating the unit in Cooling Operation.

CAUTION

Never charge a large amount of liquid refrigerant at once to the unit. This may cause damage to the compressor.

When charging with a refrigerant cylinder, use an electronic scale for charging refrigerant. In this case, if the volume of refrigerant in the cylinder becomes less than 20% of the fully-charged amount, the composition of the refrigerant starts to change. Thus, do not use the refrigerant if

the amount in the charging cylinder is less than 20%.

Also, charge the minimum necessary amount to the charging cylinder before using it to charge the air conditioning unit.

Valve

Liquid

Single valve

Charge liquid refrigerant with cylinder in up-side-down position.

Fig. 1

Valve

Example:

In case of charging refrigerant to a unit requiring

1.68 lb. (0.76 Kg) using a capacity of a 22 lb. (10 Kg) cylinder, the minimum necessary amount for the cylinder is:

1.68 + 22 0.20 = 6.08 lb. (0.76 + 10 0.20 = 2.76 Kg)

For the remaining refrigerant, refer to the instructions of the refrigerant manufacturer.

If using a charging cylinder, transfer the specified amount of liquid refrigerant from the refrigerant cylinder to the charging cylinder.

Prepare an evacuated charging cylinder beforehand.

CAUTION

To prevent the composition of R410A from changing, never bleed the refrigerant gas into the atmosphere while transferring the refrigerant. (Fig. 3)

Charging

cylinder

Open

Liquid

Single valve (with siphon tube)

Charge with cylinder in normal position.

Fig. 2

NO!

Liquid

Refrigerant

cylinder

Do not use the refrigerant if the amount in the charging cylinder is less than 20%.

Fig. 3

11-6. In Case Refrigerant is Leaking

CAUTION

Never attempt to charge additional refrigerant when refrigerant has been leaking from the unit. Follow the procedure described below to locate points of leaks and carry out repairs, then recharge the refrigerant.

(1) Detecting Leaks

Use the detector for R410A to locate refrigerant leak points.

(2) Recovering refrigerant

Never release the gas to the atmosphere; recover residual refrigerant using the refrigerant recovery unit for R410A, instead.

Do not reuse the recovered refrigerant because its composition will have been altered.

(3) Welding leaking points

Confirm again that no residual refrigerant exists in the unit before starting welding.

Weld securely using flux and wax for R410A.

Prevent oxide film from forming inside the tubes utilizing substitution with nitrogen (N2) in the refrigerant circuit of the unit. Leave ends of tubes open during welding.

(1) Detect leaks

(2) Recover refrigerant

(3) Weld leaking points

(4) Checking for sealing

Use nitrogen gas for the pressurized gas, and never use a refrigerant other than R410A. Also do not use oxygen or any flammable gas.

(5) Evacuation

Use a solenoid valve-installed vacuum pump so that

even if power is cut off in the middle of evacuation of air due to a power interruption, the valve will prevent the pump oil from flowing back.

The equipment may be damaged if moisture remains in the tubing, thus carry out the evacuation thoroughly.

When using a vacuum pump with exhaust air volume more than 0.883 cu.ft./min. and ultimate vacuum pressure rate of 50 micron Hg.

Standard time for evacuation

Length of tubing

Evacuation time

(6) Recharging

Less than 33 ft. (10 m)

More than 10 minutes

(4) Check for sealing

(5) Evacuation

(6) Recharge

More than 33 ft. (10 m)

More than 15 minutes

Recharge unit in the same manner explained on the previous page "(5) Recharging."

11-7. Charging Additional Refrigerant

11-7-1. When Tubes are Extended

Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came with the indoor unit. Charge additional refrigerant in liquid state only.

CAUTION

Never charge additional refrigerant if refrigerant is leaking from the unit. Follow instructions given in "11-6. In Case Refrigerant is Leaking" and completely carry out repairs. Only then should you recharge the refrigerant.

11-8. Retro-Fitting Existing Systems

11-8-1. Use of Existing Units

Never use new refrigerant R410A for existing units which use R22. This will cause the air conditioner to

operate improperly and may result in a hazardous condition.

11-8-2. Use of Existing Tubing

If replacing an older unit that used refrigerant R22 with a R410A unit, do not use its existing tubing. Instead, completely new tubing must be used.

Operating InstructionsAPPENDIX A

CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

(852-6-4181-211-00-1)

A-1

Operating Instructions

Split System Air Conditioner

Model No. Indoor Units

CS-KS12NB41 CS-KS18NB4UW

Ceiling Panel

CZ-18BT1U

This air conditioner uses the refrigerant R410A.

Outdoor Units (For Single use)

CU-KS12NK1A CU-KS18NKU CU-KS18NKUA

(For Multiple use)

CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU

“Multiple use” is applied for the model CS-KS18NB4UW only.

• “Single use” means that only one indoor unit is connected with one outdoor unit in a one-unit-to-one-

unit configuration.

• “Multiple use” (i.e. Flexi-Multi system) means that two or more indoor units are connected with one outdoor unit in a multiple-unit-to-one-unit configuration.

Before operating the unit, read these operating instructions thoroughly and keep them for future reference.

85264181211001

Panasonic Corporation

1006 Kadoma, Kadoma City, Osaka, Japan

CV6233187622

FEATURES

CAUTION

This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these functions are provided below; refer to these descriptions when using the air conditioner.

• Microprocessor Controlled Operation

The interior compartment of the remote controller contains several features to facilitate automatic operation, easy logically displayed for easy use.

• Simple One-touch Remote Controller

The remote controller has several features to facilitate automatic operation.

• 24-Hour ON or OFF Timer

This timer can be set to automatically turn the unit on or off at any time within a 24 hour period.

• 1-Hour OFF Timer

This timer can be set to automatically turn off the unit at any time after one hour.

• Night Setback

This function saves energy by controlling operation to provide a quieter operating sound than normal.

CONTENTS

Page

FEATURES.................................................................................2

PRODUCT INFORMATION ........................................................2

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

INSTALLATION LOCATION........................................................3

ELECTRICAL REQUIREMENTS ...............................................3

SAFETY INSTRUCTIONS..........................................................3

NAMES OF PARTS ....................................................................4

USING THE REMOTE CONTROLLER......................................8

OPERATION WITH THE REMOTE CONTROLLER...................9

1. Operation ....................................................................9

2. Adjusting the Fan Speed.............................................9

3. Fan Only......................................................................9

4. Night Setback Mode..................................................10

5. HIGH POWER Mode.................................................10

• Automatic and 3-step Fan Speed

Auto/High/Medium/Low

• Air Sweep Control

This function moves a flap up and down in the air outlet, directing air in a sweeping motion around the room and providing comfort in every corner.

• Auto. Flap Control

This automatically sets the flap to the optimum position during cooling and drying operation.

• Automatic Restart Function for Power Failure

Even when power failure occurs, preset programmed operation can be reactivated once power resumes.

• High Power Operation

The unit operates at maximum output for 30 minutes, regardless of the desired temperature. The fan speed is 1 step above “High”.

Page

SPECIAL REMARKS ...............................................................10

SETTING THE TIMER .............................................................10

USING THE 1-HOUR OFF TIMER ..........................................12

TIPS FOR ENERGY SAVING .................................................. 12

ADJUSTING THE AIRFLOW DIRECTION .............................. 12

OPERATION WITHOUT THE REMOTE CONTROLLER......... 13

CARE AND CLEANING ...........................................................13

TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) .15

OPERATING RANGE...............................................................15

WIRED REMOTE CONTROLLER ........................................... 15

SPECIFICATIONS.................................................................... 16

PRODUCT INFORMATION

If you have problems or questions concerning your Air Conditioner, you will need the following information. Model and serial numbers are on the nameplate on the bottom of the cabinet.

Model No. __________________________________

Serial No. ___________________________________

Date of purchase _____________________________

Dealer’s address _____________________________

Phone number _______________________________

SAFETY PRECAUTIONS

The following symbols used in this manual, alert you to potentially dangerous conditions to users, service personnel or the appliance:

This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death.

This symbol refers to a hazard or unsafe practice which can result in personal injury or product or property damage.

INSTALLATION LOCATION

NOTE

CAUTION

NOTICE

• We recommend that this air conditioner be installed properly by qualified installation technicians in accordance with the Installation Instructions provided with the unit.

• Before installation, check that the voltage of the electric supply in your home or office is the same as the voltage shown on the nameplate.

• Do not install this air conditioner where there are fumes or flammable gases, or in an extremely humid space such as a greenhouse.

• Do not install the air conditioner where excessively high heat-generating objects are placed.

Avoid:

To protect the air conditioner from heavy corrosion, avoid installing the outdoor unit where salty sea water can splash directly onto it or in sulphurous air near a spa.

ELECTRICAL REQUIREMENTS

1. All wiring must conform to the local electrical codes.

Consult your dealer or a qualified electrician for details.

2. Each unit must be properly grounded with a ground (or earth) wire or through the supply wiring.

3. Wiring must be done by a qualified electrician.

Pull off the power plug from a receptacle, or switch off the breaker, or switch off the power disconnecting mean to isolate the air conditioner from the main power supply when not in use for a long time.

• To prevent possible hazards from insulation failure, the unit must be grounded.

• Do not clean inside the indoor and outdoor units by users. Engage authorized dealer or specialist for cleaning.

• In case of malfunction of this appliance, do not repair by yourself. Contact to the sales dealer or service dealer for a repair.

• Refrigerant gas leakage may cause fire.

• For safety, be sure to turn the air conditioner off and also to disconnect the power before cleaning.

• Pull off the power plug from a receptacle, or switch off the breaker, or switch off the power disconnecting mean to isolate the air conditioner from the main power supply in case of emergency.

• Do not turn the air conditioner on and off from the power mains switch. Use the ON/OFF operation button.

• Do not stick anything into the air outlet of the outdoor unit. This is dangerous because the fan is rotating at high speed.

• Do not touch the air inlet or the sharp aluminum fins of the outdoor unit. You may get injured.

• Keep the fire alarm and the air outlet at least 1.5m away from the unit.

• Do not let children play with the air conditioner.

• Do not cool or heat the room too much if babies or invalids are present.

• Do not sit or step on the unit. You may fall down accidentally.

• Do not stick any object into the FAN CASE. You may be injured and the unit may be damaged.

SAFETY INSTRUCTIONS

• Read this Instruction Manual carefully before using this air conditioner. If you still have any difficulties or problems, consult your dealer for help.

• This air conditioner is designed to give you comfortable room conditions. Use this only for its intended purpose as described in this Instruction Manual.

• Confirm to authorized dealer or specialist on usage of specified refrigerant type. Using of refrigerant other than the specified type may cause

product damage, burst and injury etc.

• Never touch the unit with wet hands.

• Never use or store gasoline or other flammable vapor or liquid near the air conditioner — it is very dangerous.

• Do not use this appliance in a potentially explosive atmosphere.

• This air conditioner has no ventilator for intaking fresh air from outdoors. You must open doors or windows frequently when you use gas or oil heating appliances in the same room, which consume a lot of oxygen from the air. Otherwise there is a risk of suffocation in an extreme case.

• Do not swallow the battery.

• After removing the battery from remote controller, keep it away from the reach of children. The battery can cause death by suffocation if swallowed.

• When inserting the battery, make sure the polarities (+ and -) are correct.

• This device complies with part 15 of the FCC Rules.

Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

• This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from

that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for

help.

• FCC Caution: To assure continued compliance, follow the attached installation instructions. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.

NAMES OF PARTS

INDOOR UNIT

Air Intakes

Remote Controller

Refrigerant Tubes

Drain Hose

OUTDOOR UNIT

Air Outlet

Air Outlet! (4 locations)

NOTE

This illustration is based on the external view of a standard model. Consequently, the shape may differ from that of the air conditioner which you have selected.

This air conditioner consists of an indoor unit and an outdoor unit. You can control the air conditioner with the remote controller.

Air Intake

Air Outlet

Remote Controller

Refrigerant Tubes

Drain Hose

Outdoor (Condensing) Unit

Air from the room is drawn into this section and passes through air filters which remove dust.

Conditioned air is blown out of the air conditioner through the air outlet.

The remote controller controls power ON/OFF, operation mode selection, temperature, fan speed, timer setting, and air sweeping.

The indoor and outdoor units are connected by copper tubes through which refrigerant gas flows.

Moisture in the room condenses and drains off through this hose.

The outdoor unit contains the compressor, fan motor, heat exchanger coil, and other electrical components.

UNIT DISPLAY AND OPERATION BUTTON

INDOOR UNIT

OPERATION button

OPERATION lamp

TIMER lamp

HIGH POWER lamp

REMOTE CONTROL receiver

IMPORTANT

Avoid using radio equipment such as mobile phone near (within 4 ft. (1.2 m)) the remote control receiver. Some radio equipment may cause malfunction of the unit.

If the trouble happens, disconnect power and restart the air conditioner after a few minutes.

REMOTE CONTROL receiver

OPERATION button

OPERATION lamp

TIMER lamp This lamp lights when the system is being

HIGH POWER lamp

The unit’s display lamps are dimmed during operation in the NIGHT SETBACK mode.

This section picks up infrared signals from the remote controller (transmitter).

When the remote controller cannot be used, pressing this button enables cooling operation.

Each time this button is pressed, the operation mode changes cyclically.

Cooling operation

This lamp lights when the system is in the continuous DRY (orange), COOL (green) and FAN (green) mode.

controlled by the timer.

This lamp lights during operation in the HIGH POWER mode.

Stop

REMOTE CONTROLLER (DISPLAY)

Displayed when the time

display is set to 12-hour

time.

Symbols

Displayed when transmitting data

Displayed when indoor unit sensor is in use

Displayed when setting temperature

Displayed when temperature is shown

Displayed when setting timer

(1) Operation mode

MILD DRY ..............................

COOL .....................................

FAN ........................................

(2) Fan speed

Automatic operation ...............

HIGH .....................................

MEDIUM.................................

LOW .......................................

(4) Timer

24-hour clock with ON/OFF

program Timer .......................

ON Timer. ..............................

OFF Timer. ............................

1-hour OFF Timer..................

(5) NIGHT SETBACK..................

(6) Confirmation

of transmission.......................

(7) Auto. flap indication................

(3) Temperature setting

60–86°F When set to 80 °F

temperature indication............

Flap angle indication..............

Sweep indication....................

(8) High power operation.............

REMOTE CONTROLLER

NOTE

Transmitter

When you press the buttons on the remote controller, the mark appears in the display to transmit the setting changes to the receiver in the air conditioner.

Display

Information on the operating conditions is displayed while the remote controller is switched on. If the unit is turned off, FLAP setting and FAN SPEED setting are not displayed.

HIGH POWER button

: If this button is pressed during DRY, COOL or FAN operation, the unit

operates at maximum output for 30 minutes, regardless of the desired temperature. The fan speed is 1step above ‘‘HIGH’’.

FAN SPEED selector button

: The air conditioner automatically decides the fan speeds. : High fan speed : Medium fan speed : Low fan speed

FLAP button

Press this button either to select the setting of the airflow direction to the auto. flap in each mode or one of the six possible positions manually or to select the sweep function which moves the flap up and down automatically.

: Auto flap setting: If selected in a cooling or dry operation, the flap is set

at position (7) in the following chart. : The airflow direction can be set manually. (six positions) : The flap moves up and down automatically.

When you press the FLAP button, the air flow direction will be changed one by one as follows.

SWEEP

ON TIME/OFF TIME setting buttons

Advance button Return button

No display: The timer does not operate.

: The air conditioner starts at the set time.

: The air conditioner stops at the set time.

: The air conditioner stops and starts, or starts and

stops, at the set times every day. For details, see “SETTING THE TIMER”.

CANCEL button

SENSOR button

When you press this button (use a small-tipped object such as a ballpoint pen), the mark will appear at the display. And the room temperature is detected by the sensor which is built into the indoor unit and the air conditioner is controlled accordingly.

If the remote controller is located near a heat source, such as a space heater or in direct sunlight, press the SENSOR button to switch to the sensor on the indoor unit.

ADDRESS switch

• The address switch changes to prevent mixing of signals from remote controller’s when two air conditioners are installed next to each other. Normally, the address switch is set to A. For more information, please contact the dealer where you made the purchase.

• Normally, the tabs on the remote controller should not be bent.

Temperature display selector button

This switches the temperature display between °C and °F.

Sensor

NOTE

A temperature sensor inside the remote controller senses the room temperature.

ON/OFF operation button

This button is for turning the air conditioner on and off.

1 HR. TIMER button (1-HOUR OFF TIMER)

: When you press this button, regardless of whether the unit is operating

or stopping, the unit operates for one hour and then shuts down.

Temperature setting buttons (TEMP.)

Press the button to increase the set temperature.

Press the button to reduce the set temperature. The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.

buttons is pressed.

MODE selector button

Use this button to select DRY, COOL or FAN mode.

(DRY) : The air conditioner reduces the humidity in the room.

(COOL) : The air conditioner makes the room cooler.

(FAN) : The air conditioner works only as a circulation fan.

NIGHT SETBACK button

For details, see “4. Night Setback Mode”. When you press this button in the DRY or COOL mode, the mark appears in the display, and the remote controller will automatically adjust the set temperature to save energy.

CLOCK button

Time display selector button

This switches the time display between 24-hour time and 12-hour time.

ACL button (ALL CLEAR)

Puts the remote controller into pre-operation status. Always press this button after replacing the batteries.

(Cover closed)

• The illustration above pictures the remote controller after the cover has been opened.

• The remote controller sends the temperature signal to the air conditioner regularly at five minute intervals. If the signal from the remote controller stops for more than 15 minutes due to the loss of the remote controller or other trouble, the air conditioner will switch to the temperature sensor which is built into the indoor unit and control the room temperature. In these cases, the temperature around the remote controller may differ from the temperature detected at the air conditioner’s position.

• The indoor fan runs continuously when the system is in normal operation. It does not turn off when the desired room temperature is reached. If Night Set Back mode is selected, the fan will turn off intermittently during cooling operation in order to control air flow.

USING THE REMOTE CONTROLLER

CAUTION

Air Conditioner (Indoor unit)

Receiver

Remote Controller

(Transmitter head)

HOW TO INSTALL BATTERIES

ACL button

1. Slide the cover in the direction indicated by the arrow and remove

it.

2. Install two AAA alkaline batteries. Make sure the batteries point in

the direction marked in the battery compartment.

3. Use a thin object such as the tip of a pen to press the ACL button.

• The batteries last about six months, depending on how much you use the remote controller. Replace the batteries when the remote controller’s display fails to light, or when the remote controller cannot be used to change the air conditioner’s settings.

• Use two fresh leak-proof type-AAA alkaline batteries.

• In replacing batteries, follow the instructions as mentioned in the subsection “HOW TO INSTALL BATTERIES”.

• If you do not use the remote controller more than 1 month, take out the batteries.

• Dispose of the used batteries at the designated location in compliance with the applicable local ordinances.

HOW TO USE THE REMOTE CONTROLLER

When using the remote controller, always point the unit’s transmitter head directly at the air conditioner’s receiver.

REMOTE CONTROLLER INSTALLATION POSITION

The remote controller may be operated either from a non-fixed position or from a wall-mounted position. To ensure that the air conditioner operates correctly, do not install the remote controller in the following places:

• In direct sunlight

• Behind a curtain or other places where it is covered

• More than 26 ft.(8 m) away from the air conditioner

• In the path of the air conditioner’s airstream

• Where it may become extremely hot or cold

• Where it may be subject to electrical or magnetic noise

• Where there is an obstacle between the remote controller and air conditioner (since a check signal is sent from the remote controller every 5 minutes)

MOUNTING THE REMOTE CONTROLLER

Before mounting the remote controller, press the ON/OFF operation button at the mounting location to make sure that the air conditioner operates from that location. The indoor unit should make a beeping sound to indicate that it has received the signal.

Rear Side

Remote Control Holder

Information for Users on Collection and Disposal of Old Equipment and used Batteries

[Information on Disposal in other Countries outside the European Union]

These symbols are only valid in the European Union. If you wish to discard these items, please contact your local authorities or dealer and ask for the correct method of disposal.

Note for the battery symbol (bottom two symbol examples):

This symbol might be used in combination with a chemical symbol. In this case it complies with the requirement set by the Directive for the chemical involved.

Press

Set in place

Mounting Screws

5/32 x 5/8"

(4 x 16 mm)

(included)

To take out the remote controller, pull it forward.

• To prevent loss of the remote controller, you can connect the remote controller to the holder by passing a string through the remote controller and attachment hole.

Hole

WHEN HOLDING THE REMOTE CONTROLLER

• When using the remote controller and during air conditioner operation, the transmitter on the remote controller should be pointed towards the receiver on the indoor unit.

• Make sure that there are no objects between the remote controller and receiver which could block the signal.

OPERATION WITH THE REMOTE CONTROLLER

NOTE

1. Operation 2. Adjusting the Fan Speed

A. Automatic fan speed

Simply set the FAN SPEED selector button to the position. This automatically sets the best fan speed for the room temperature.

B. Manual fan speed

If you want to adjust fan speed manually during operation, just set the FAN SPEED selector button as desired. [ ,

STEP 2

STEP 3

3. Fan Only

, or ]

STEP 2

STEP 4

STEP 1

STEP 5

Check that the circuit breaker on the power panel is turned on.

Press the setting buttons as described below and change the settings as desired.

STEP 1 Press the MODE selector button

STEP 2 To start the air conditioner, press the ON/

STEP 3 Press the TEMP. setting buttons to change

STEP 4 Set the FAN SPEED selector button to the

STEP 5 Press the FLAP button and set the airflow

To stop the air conditioner, press the ON/OFF operation button again.

and select the desired mode. For dehumidifying operation For cooling operation For fan only operation

OFF operation button.

the temperature setting to the desired temperature. Adjustable temperature range:

30 °C max. 16 °C min.

setting you want.

direction as desired. (Refer to “ADJUSTING THE AIRFLOW DIRECTION” on page 12.)

or 86 °F max.

60 °F min.

o o o

STEP 3

If you want to circulate air without any temperature control, follow these steps:

STEP 1 Press the MODE selector button to switch to

the fan mode .

STEP 2 Press the ON/OFF operation button.

STEP 3 Press the FAN SPEED selector button to

select the fan speed of your choice ( ,

or ).

STEP 1

• Choose the best position in the room for the remote controller, which also acts as the sensor for room comfort and transmits the operating instructions. Once you’ve found this best position, always keep the remote controller there.

• This appliance has a built-in 5-minute time delay circuit to ensure reliable operation. When the operation button is pressed, the compressor will start running within three minutes. In the event of power failure, the unit will stop.

4. Night Setback Mode

Setting temperature

Press the NIGHT SETBACK button

30 min.

Time

2°F

When the night setback mode is selected, the air conditioner automatically raises the temperature setting 2 °F when 30 minutes have passed after the selection was made, and then another 2 °F after another 30 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle cooling is needed.

NOTE

‘‘DRY’’ ( ) Operation

Cooling ( ) operation

Power failure during operation

Clicking Sound

Remote Controller

NOTE

Night Setback Mode is used for saving energy.

Press the NIGHT SETBACK button while unit is operating. The mark appears in the display.

To release the night setback function, press the NIGHT SETBACK button again.

In Cooling and DRY Mode: ( and )

HIGH POWER mode can be used to increase the output of the indoor unit for all operation modes.

Press the HIGH POWER button while unit is operating. The mark appears in the display.

To cancel, press HIGH POWER button again.

• When the HIGH POWER button is pressed, the unit operates at maximum output for 30 minutes, regardless of the desired temperature. The fan speed is 1 step above “High”.

Depending on the operating conditions, the fan speed may be increased by a small amount only.

SPECIAL REMARKS

How it works?

• Once the room temperature reaches the level that was set, the unit’s operation frequency is changed automatically.

• During DRY operation, the fan speed automatically runs at lower speed for providing a comfortable breeze.

• ‘‘DRY’’ operation is not possible if the indoor temperature is 59 °F or less.

• Sometimes the indoor unit may not get to the set fan speed such as LOW under cool operation at very low outdoor temperatures due to the indoor unit being protected from ice or frost when combined with the outdoor unit for Low Ambient Cooling models.

5. HIGH POWER Mode

• In the event of power failure, the unit will stop. When the power is resumed, the unit will restart automatically in approximately 5 minutes by the remote controller.

Clicking sound is heard from the air conditioner

• In cooling operation, any plastic parts may shrink due to a sudden temperature change. In this event, a clicking sound may occur. This is normal, and the sound will soon disappear.

• The remote controller sends the setting condition to the air conditioner regularly at five minute intervals.

SETTING THE TIMER

In the descriptions below, the following settings are used for the temperature and time indicator selector button on the bottom front section of the remote controller.

• Temperature: °F

• Time: AM, PM

1. How to set the present time

NOTE

(Example) To set to 10:30 pm.

Operation Indication

1. Press the CLOCK button

once if the time indicator is not flashing.

2. Press the Advance, Return

( , ) button until PM 10:30 is displayed.

3. Press the CLOCK button

again.

The time indication alone flashes.

The time can be set in 1-minute increments. Holding down the button advances the time rapidly in 10-minute increments.

This completes the setting of the current time.

2. How to set the OFF time

(Example) To stop the air conditioner at 11:00 am.

Operation Indication

1. Press the ON TIME setting

button once.

2. Press the Advance, Return

( , ) button until AM 7:10 is displayed.

3. Wait a few seconds, and then

the setting is complete.

The timer indication is displayed, and the present ON time is shown.

The timer indication blinks. The time can be set in 10-minute increments. Holding down the button advances the time rapidly in 10-minute increments.

The timer indication stops blinking and the present time is displayed.

4. How to set daily ON/OFF repeat timer

(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00 am.

Operation Indication

1. Press the OFF TIME setting

button once.

2. Press the Advance, Return

( , ) button until AM 11:00 is displayed.

3. Wait a few seconds, and then

the setting is complete.

The timer indication is displayed, and the present OFF time is shown.

The timer indication blinks. The time can be set in 10-minute increments. Holding down the button advances the time rapidly in 10-minute increments.

The timer indication stops blinking and the present time is displayed.

3. How to set the ON time

(Example) To start operation at 7:10 am.

10:30 pm. Present time

7:10 am. ON

11:00 am. OFF

Operation Indication

1. Set the timer ON/OFF times

as shown in 2-1, 2, 3 and 3-1, 2, 3.

• The ON/OFF combination timer uses the current time as the reference, and it is activated starting from whichever set time comes first.

• With the ON/OFF combination timer, the settings are repeated every day.

• You can check the timer ON/OFF times after you have set them by pressing the ON TIME and OFF TIME setting buttons.

To cancel a timer program

• Press the CANCEL button.

• When either an ON or OFF timer is to be canceled, press the button corresponding to the timer whose program is to be canceled, and then press the CANCEL button.

• The airflow direction, fan speed and temperature setting can be changed after a timer program has been set even when the unit is stopped. Even when operation is stopped during an ON timer program, the unit will start operating when the set time is reached provided that the program is not canceled.

• When the ON timer and OFF timer are set to the same time, the timer operates as if it is turned off.

The present time 10:30 pm. and

are displayed.

USING THE 1-HOUR OFF

NOTE

SWEEP

A. Sweep function

The flap starts moving up and down to deliver air over the sweep range.

B. Setting the airflow manually

Referring to the above illustration, use the FLAP button to set the airflow direction within the range used during the cooling or dehumidifying operation.

C. Auto flap function

The flap is set to the recommended position.

NOTE

CAUTION

TIMER

1. 1-Hour OFF Timer

This function causes the unit to operate for one hour and then stop, regardless of whether the unit is on or off when this button is pressed.

The indicator in the display indicates that this function is operating.

Setting procedure:

Regardless of whether the unit is operating or stopped, press the 1 HR. TIMER button.

appears in the display.

Cancellation procedure:

Press the ON/OFF operation button to turn the unit off, wait for the unit to stop operating, and then press the ON/OFF operation button again. The 1-Hour Timer function is now cancelled and the unit operates normally.

ADJUSTING THE AIRFLOW DIRECTION

The vertical airflow can be adjusted by moving the flap with the remote controller. Do not move the flap with your hands. Confirm that the remote controller has been turned on. Use the FLAP button to set either the sweep function or one of the six airflow direction settings.

COOL

DRY

FAN

• If, while the 1-Hour Timer function is operating, the 1HR. TIMER button is pressed once to cancel the function and then again, the unit continues to operate for one hour from that point in time and then stops.

• It is not possible to use the OFF Timer and 1-Hour OFF Timer together. Whichever function is set last takes precedence. If the 1 HR. TIMER button is pressed while the TIMER OFF function operates, the OFF Timer is cancelled and the unit will stop operating one hour later.

2. Operation together with the daily ON/OFF

repeat timer

The 1-Hour OFF Timer setting is given priority over the DAILY ON/ OFF REPEAT setting.

TIPS FOR ENERGY SAVING

Avoid

• Do not block neither the air intake nor the air outlet. It may cause less performance, and may leads to malfunctions.

• Do not let direct sunlight into the room. Use sunshades, blinds or curtains. If the walls and ceiling of the room are warmed by the sun, it will take longer to cool the room.

• Always try to keep the air filter clean. (Refer to “CARE AND CLEANING”.) A clogged filter will impair the performance of the unit.

• To prevent conditioned air from escaping, keep windows, doors and any other openings closed.

The flap automatically closes when the unit is off.

• Use the FLAP button on the remote controller to adjust the position of the flap. If you move the flap by hand, the flap position according to the remote controller and the actual flap position may no longer match. If this should happen, shut off the unit, wait for the flap to close, and then turn on the unit again; the flap position will now be normal again.

• Do not have the flap pointed down during cooling operation. Condensation may begin to form around the air vent and drip down.

OPERATION WITHOUT THE

NOTE

CAUTION

REMOTE CONTROLLER

INDOOR UNIT

OPERATION button

OPERATION lamp

If you have lost the remote controller or it has trouble, follow the steps below.

When the air conditioner is not running

Each time the OPERATION button is pressed, the operation mode changes cyclically.

Cooling operation

The temperature is set to the room temperature minus 4°F during the cooling operation, and the fan speed and flap are set to Auto.

Stop

CARE AND CLEANING

• Cleaning and maintenance operations must be carried out by specially trained personnel. While working in high places, slipping or falling may result in serious injury.

• For safety, be sure to turn the air conditioner off and also to disconnect the power before cleaning.

• Do not pour water on the indoor unit to clean it. This will damage the internal components and cause an electric shock hazard.

Ceiling panel (Indoor Unit)

Clean the ceiling panel of the indoor unit with a vacuum cleaner brush, or wipe it with a clean, soft cloth.

If it is stained, use a clean cloth moistened with a mild liquid detergent. When cleaning it, be careful not to force the flaps out of place.

• Never use solvents, or harsh chemicals when cleaning the indoor unit. Do not wipe the plastic casing using very hot water.

• Some metal edges and the fins are sharp and may cause injury if handled improperly; be especially careful when you clean these parts.

• The internal coil and other components of the outdoor unit must be cleaned every year. Consult your dealer or service center.

Cleaning the flaps

• The air outlet flap can be removed and washed with water.

• Be sure to always stop operation before removing the flap.

• After washing with water, allow it to dry, and then remount it.

• Do not move the flap with your hands.

• When using a footstool or the like, be careful not to let it tip over.

Cleaning the main unit and Remote Controller

• Wipe clean using a soft, dry cloth.

• To remove stubborn dirt, moisten a cloth in warm water no hotter

than 104 °F, wring thoroughly, and then wipe.

Air filter

NOTE

CAUTION

The air filter collects dust and other particles from the air and should be cleaned once every 6 months. If the filter gets blocked, the efficiency of the air conditioner drops greatly.

The frequency with which the filter should be cleaned depends on the environment in which the unit is used.

How to remove the filter

Slide the two latches of the air intake grille with your thumbs in the direction of the arrow to open the grille.

Air intake grille

How to remove the air intake grille

Open the air intake grille.

2. Detach the safety cord from the frame (remember to attach it

again after cleaning or maintenance).

3. Hold on the air intake grille and pull it towards you to detach the

two air intake grille hinges.

4. Clean the grille gently using a soft sponge, or the like. Then dry it

with care. Neutral detergent may be used to remove stubborn dirt. Then rinse thoroughly with water and dry it.

Air intake grille hinge

Latch

Air intake grille hinge

Ceiling panel

2. Open the air intake grille downward.

Air intake grille

3. Press the tabs on both sides of the air filter (indicated with

marks on the grill) to release the filter, and then, lift and pull the filter up and out using the tabs to remove it.

Safety cord

Air filter

Safety cord

• When cleaning the air filter, never remove the safety cord. If it is necessary to remove it for servicing and maintenance inside, be sure to reinstall the safety cord securely (hook on the grille side) after the work.

• When the air intake grille has been opened, rotating parts (such as the fan), electrically charged areas, etc. will be exposed in the unit’s opening. Bear in mind the dangers that these parts and areas pose, and proceed with the work carefully.

• Periodically check the outdoor unit to see if the air outlet or air intake is clogged with dirt or soot.

Care: After a prolonged idle period

Check the indoor and outdoor unit air intakes and outlets for blockage; if there is a blockage, remove it.

Care: Before a prolonged idle period

• Operate the fan for half a day to dry out the inside.

• Disconnect the power supply and also turn off the circuit breaker.

• Clean the air filter and replace it in its original position.

• Outdoor unit internal components must be checked and cleaned periodically. Contact your local dealer for this service.

4. Use a vacuum cleaner to remove light dust. If there is sticky dust

on the filter, wash the filter in lukewarm, soapy water, rinse it in clean water, and dry it.

5. Insert the filter correctly again inside the grille, close the grille

letting the latches slide towards the outside and fix again the latch.

TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)

If your air conditioner does not work properly, first check the following points before requesting service. If it still does not work properly, contact your dealer or service center.

Trouble Possible Cause Remedy

Air conditioner does not run at all.

1. Power failure. 1. Restore power.

2. Leakage circuit breaker tripped.

2. Contact service center.

OPERATING RANGE

The air conditioner is operable within the temperature ranges as listed below: For Cooling Only Models : CU-KS18NKU

Temperature Indoor air

temperature

COOLING Max. 95 °F DB /

71 °F WB

Min. 67 °F DB /

57 °F WB

Outdoor air temperature

115 °F DB

67 °F DB

OPERATION lamp blinks and air conditioner does not operate.

Compressor runs but soon stops.

Poor cooling performance.

Clicking sound is heard from the air conditioner.

OPERATION lamp lights but outdoor unit will not run.

TIMER lamp blinks (3 sec. interval) and air conditioner does not operate.

3. Line voltage is too low.

4. Batteries in remote controller have run down.

Trouble in system. Contact service

Obstruction in front of condenser coil. (Outdoor Unit)

1. Dirty or clogged air filter.

2. Heat source or many people in room.

3. Doors and/or windows are open.

4. Obstacle near air intake or air discharge port.

5. Thermostat is set too high for cooling.

In cooling operation, any plastic parts may shrink due to a sudden temperature change. In this event, a clicking sound may occur.

The use of cellular phones near the air conditioner may cause disturbance to its normal operation.

FLOAT SWITCH is actived.

3. Consult your electrician or dealer.

4. Replace batteries.

center.

Remove obstruction.

1. Clean air filter to improve airflow.

2. Eliminate heat source if possible.

3. Shut them to keep the heat out.

4. Remove it to ensure good airflow.

5. Set the temperature lower.

This is normal, and the sound will soon disappear.

1. Turn off the power then restart the air conditioner after a while.

2. Consult your dealer.

Contact service center.

For Low Ambient Cooling Models : CU-KS12NK1A, CU-KS18NKUA

Temperature Indoor air

temperature

COOLING Max. 95 °F DB /

Outdoor air temperature

115 °F DB

71 °F WB

Min. 67 °F DB /

0 °F DB

57 °F WB

For Cooling Only Models : CU-3KS19NBU, CU-4KS24NBU,

CU-4KS31NBU

Temperature Indoor air

temperature

COOLING Max. 95 °F DB /

Outdoor air temperature

115 °F DB

71 °F WB

Min. 67 °F DB /

14 °F DB

57 °F WB

WIRED REMOTE CONTROLLER

A separately sold wired remote controller (CZ-RD515U) used with this air conditioner is also available. If you wish to use the wired remote control function, you will need to purchase the optional wired remote controller.

SPECIFICATIONS

Model No.

• For Single use

Heating Capacity

Operation Sound

Unit Dimensions (H×W×D)

Net Weight

Power Source

Cooling Capacity

BTU/h

inch(mm)

lbs.(kg)

Cooling

Operation

Outdoor (Hi)

Indoor(H/M/L)

Outdoor (Hi)

Indoor(H/M/L)

Heating

Operation

dB(A)

Model No.

Heating Capacity

Operation Sound

Unit Dimensions (H×W×D)

Net Weight

Power Source

Cooling Capacity

BTU/h

inch(mm)

lbs.(kg)

Cooling

Operation

Outdoor (Hi)

Indoor(H/M/L)

Outdoor (Hi)

Indoor(H/M/L)

Heating

Operation

dB(A)

Indoor Unit

CS-KS12NB41

34/32/31

11-5/32×22-5/8×22-5/8

(283×575×575)

35.3(16.0)

Indoor Unit

CS-KS18NB4UW

44/40/36

11-5/32×22-5/8×22-5/8

(283×575×575)

35.3(16.0)

Outdoor Unit

CU-KS12NK1A

21-9/16×28-11/32×10-7/16

(548×720×265)

75.0(34.0)

Outdoor Unit

CU-KS18NKU , CU-KS18NKUA

26-3/8×34-21/32×11-7/32

(670×880×285)

90.4(41.0)

Model No.

11,900 [ 3,000 ~ 11,900 ]

Single-phase, 115 V, 60 Hz

3.50 [ 0.90 ~ 3.50 ]

17,500 [ 4,000 ~ 17,500 ]

Single-phase, 208-230 V, 60 Hz

5.15 [ 1.20 ~ 5.15 ]

Ceiling Panel

CZ-18BT1U

6.0(2.7)

1-9/16×24-19/32×24-19/32

(40×625×625)

Unit Dimensions (H×W×D)

Net Weight lbs. (kg)

Model No.

• For Multiple use

Heating Capacity

Operation Sound

Unit Dimensions (H×W×D)

Net Weight

Power Source

Cooling Capacity

BTU/h

inch(mm)

lbs.(kg)

Cooling Operation

(H/M/L)

Heating Operation

(H/M/L)

dB(A)

Indoor Unit

CS-KS18NB4UW

17,500

Single-phase, 208-230 V, 60 Hz

5.15

44/40/36

11-5/32×22-5/8×22-5/8

(283×575×575)

35.3(16.0)

Model No.

Outdoor Unit

CU-4KS24NBU

CU-3KS19NBU

Single-phase, 208-230 V, 60 Hz

Heating Capacity

Operation Sound

Unit Dimensions (H×W×D)

Net Weight

Power Source

Cooling Capacity

BTU/h

inch(mm)

lbs.(kg)

Cooling Operation (Hi)

Heating Operation (Hi)

dB(A) dB(A)

18,800 [ 9,800 ~ 18,800 ]

5.50 [ 2.90 ~ 5.50 ]

29-1/8×35-7/16×12-19/32

(740×900×320)

138.9(63.0)

25,400 [ 9,800 ~ 25,400 ]

7.50 [ 2.90 ~ 7.50 ]

29-1/8×35-7/16×12-19/32

(740×900×320)

138.9(63.0)

30,600 [ 9,800〜30,600 ]

9.00 [ 2.90 ~ 9.00 ]

35-1/32×35-7/16×12-19/32

(890×900×320)

174.2(79.0)

CU-4KS31NBU

INSTALLATION INSTRUCTIONSAPPENDIX B

CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA

(852-6-4190-574-00-1)

A-2

INSTALLATION INSTRUCTIONS Split System Air Conditioner

This air conditioner uses the refrigerant R410A.

NOTE

External diameter of service port R410A: 5/16"

Model Combinations

Combine indoor and outdoor units only as listed below.

Model No.

Indoor Unit Outdoor Unit

CS-KS12NB41 CU-KS12NK1A

Power Source: 60 Hz, single-phase, 115 V

CS-KS18NB4UW CU-KS18NKU

CU-KS18NKUA

Power Source: 60 Hz, single-phase, 230/208 V

Ceiling Panel

CZ-18BT1U

Contents

Page

IMPORTANT!

Please Read Before Starting .................................. 2

1. GENERAL .......................................................... 4

1-1. Tools Required for Installation (not supplied) 1-2. Accessories Supplied with Unit 1-3. Optional Copper Tubing Kit 1-4. Type of Copper Tube and Insulation Material 1-5. Additional Materials Required for Installation

2. INSTALLATION SITE SELECTION ................... 5

2-1. Indoor Unit 2-2. Outdoor Unit 2-3. Baffle Plate for the Outdoor Unit

3. HOW TO INSTALL THE INDOOR UNIT ........... 12

3-1. Preparation for Suspending 3-2. Suspending the Indoor Unit 3-3. Placing the Unit Inside the Ceiling 3-4. Installing the Drain Piping 3-5. Checking the Drainage 3-6. How to Install the Ceiling Panel 3-7. Wiring Instructions 3-8. Recommended Wire Length and Diameter 3-9. Wiring Instructions for Inter-unit Connections

4. HOW TO INSTALL THE OUTDOOR UNIT ....... 20

4-1. Wiring Instructions for the Outdoor Unit

5. REFRIGERANT TUBING .................................. 21

5-1. Use of the Flaring Method 5-2. Flaring Procedure with a Flare Tool 5-3. Caution before Connecting Tubes Tightly 5-4. Connecting Tubing between Indoor and

Outdoor Units 5-5. Insulation of Refrigerant Tubing 5-6. Taping the Tubes 5-7. Finishing the Installation

6. AIR PURGING................................................... 23

 Air Purging with a Vacuum Pump (for Test Run)  Basic Functions of the Service Valves  Pump Down  Service Valve Connections

7. REMOTE CONTROLLER INSTALLATION

POSITION ......................................................... 27

7-1. Mounting on a Wall

8. ADDRESS SWITCH .......................................... 28

8-1. Address Setting of the Remote Controller

85264190574001 2011

CV6233187785

IMPORTANT! Please Read Before Starting

This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently.

When Transporting

Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers.

When Installing…

For safe installation and trouble-free operation, you must:



Carefully read this instruction booklet before beginning.



Follow each installation or repair step exactly as shown.



Observe all local, state, and national electrical codes.



Pay close attention to all warning and caution notices given in this manual.

This symbol refers to a hazard

WARNING

CAUTION

or unsafe practice which can result in severe personal injury or death.

This symbol refers to a hazard or unsafe practice which can result in personal injury or product or property damage.

If Necessary, Get Help

These instructions are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document.

SPECIAL PRECAUTIONS

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

…In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the unit’s weight. It may be necessary to construct a strong wood or metal frame to provide added support.

…In a Room

Properly insulate any tubing run inside a room to prevent “sweating” that can cause dripping and water damage to walls and floors.

Keep the fire alarm and the air

CAUTION

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a solid, level foundation for the outdoor unit. This prevents water damage and abnormal vibration.

…In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle.

…In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents.

outlet at least 1.5 m away from the unit.

WARNING

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are completed or reconnected and checked.

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system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or

death.

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heating at connection points and a possible fire hazard.

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the unit must be grounded.

When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM.

When Connecting Refrigerant Tubing

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gas leaks during the installation. Be careful not to allow contact of the refrigerant gas with a flame as this will cause the generation of poisonous gas.

rant cycle.

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cause fire.

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other than specified type. It may cause product damage, burst and injury etc.

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the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leakfree connection.

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or re-installation, and while repairing refrigeration parts. Handle liquid refrigerant carefully as it may cause frostbite.

When Servicing

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before opening the unit to check or repair electrical parts and wiring.

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parts.

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that no metal scraps or bits of wiring have been left inside the unit being serviced.

Others

CAUTION

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the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas.

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gas is leaking. If escaped gas comes in contact with a stove, gas water heater, electric room heater or other heat source, it can produce dangerously toxic gas.

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fins of the outdoor unit. You may get injured.

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accidentally.

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You may be injured and the unit may be damaged.

NOTE

The illustrations are based on the typical appearance of a standard model. Consequently, the shape may differ from that of the air conditioner that you are installing.

1. General

This booklet briefly outlines where and how to install the air conditioning system. Please read over the entire set of instructions for the indoor and outdoor units and make sure all accessory parts listed are with the system before beginning.

1-1. Tools Required for Installation (not supplied)

1. Standard screwdriver

2. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Carpenter’s level

1-2. Accessories Supplied with Unit

Table 1

Parts PartsFigure RemarksQ’ty Figure

Washer

Flare insulation

Insulation tape

Vinyl tie

Drain hose insulation

Remote controller

Remote control holder

AAA alkaline battery

Full-scale installation diagram

1/8"(T3) 3/16"(T5)

3/32"(T2)

13/32"(T10)

set

6. Sabre saw or key hole saw

7. Hacksaw

8. Core bits

9. Hammer

10. Drill

For temporarily suspending indoor

unit from ceiling

For wide /

narrow tube connection

For wide / narrow tube /

flare nut connection

For flare / drain insulating

connection

For drain tube

connection

Printed on

container box

Truss head screw

Drain hose

Hose band

Tapping screw

Cushion rubber

Truss head screw

Special screw

11. Tube cutter

12. Tube flaring tool

13. Torque wrench

14. Adjustable wrench

15. Reamer (for deburring)

3/16 13/32" (5 10mm)

5-1/2"(L140)

Truss-head Phillips 5/32 5/8" (4 16mm)

5/32 15/32" (4 12mm)

3/16 1-9/16" (5 40mm)

Use M10 or 3/8" for suspension bolts. Suspension bolts and nuts (locally purchased)

For full-scale installation

diagram

For unit & PVC

tube connection

For drain hose

connection

Packed in the

outdoor unit

Packed in the ceiling panel

RemarksQ’ty

1-3. Optional Copper Tubing Kit

Copper tubing for connecting the outdoor unit to the indoor unit is available in kits which contain the narrow and wide tubing, fittings and insulation. Consult your nearest sales outlet or air conditioning workshop.

1-4. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately from a local source, you will need:

1. Deoxidized annealed copper tube for refrigerant tubing as detailed in Table 2. Cut each tube to the appropriate lengths 1' to 1'4" (30 cm to 40 cm) to dampen vibration between units.

2. Foamed polyethylene insulation for the specified copper tubes as required to precise length of tubing. Wall thickness of the insulation should be not less than 5/16" (8 mm).

3. Use insulated copper wire for field wiring. Wire size varies with the total length of wiring. Refer to 3-7. Wiring Instructions for details.

CAUTION

Table 2

Model

CS-KS12NB41 1/4" (6.35 mm) 0.0314" (0.8 mm) 3/8" (9.52 mm) 0.0314" (0.8 mm)

CS-KS18NB4UW 1/4" (6.35 mm) 0.0314" (0.8 mm) 1/2" (12.70 mm) 0.0314" (0.8 mm)

Narrow Tube Wide Tube

Outer Dia. Thickness Outer Dia. Thickness

Check local electrical codes and regulations before obtaining wire. Also, check any specified instructions or limitations.

1-5. Additional Materials Required for Installation

1. Refrigeration (armored) tape

2. Insulated staples or clamps for connecting wire (See local codes)

3. Putty

4. Refrigeration lubricant

5. Clamps or saddles to secure refrigerant tubing

2. Installation Site Selection

2-1. Indoor Unit

WARNING

To prevent abnormal heat generation and the possibility of fire, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in a way that may block air flow.

AVOID:

 direct sunlight.

 nearby heat sources that may affect performance of the unit.

 areas where leakage of flammable gas may be expected.

 places where large amounts of oil mist exist.

DO:

 select an appropriate position from which every corner of

the room can be uniformly cooled.

 select a location that will hold the weight of the unit.

 select a location where tubing and drain hose have the

shortest run to the outside.

3.3 ft. (1m)

3.3 ft.

(1m)

Fig. 1

3.3 ft. (1m)

3.3 ft.

(1m)

3.3 ft. (1m)

Indoor unit

 allow room for operation and maintenance as well as unre-

stricted air flow around the unit. (Fig. 1)

 install the unit within the maximum elevation difference (H)

above or below the outdoor unit and within a total tubing length

Outdoor unit

Tubing length (L)

Elevation difference (H)

Fig. 2

(L) from the outdoor unit as detailed in Table 3 and Fig. 2.

 install the indoor unit more than 3.3' (1 m) away from any

antenna or power lines or connecting wires used for television, radio, telephone, security system, or intercom. Electrical noise from any of these sources may affect operation.

CAUTION

Air delivery will be degraded if the distance from the floor to the ceiling is greater than 10 ft. (3 m).

Table 3

Max. Allowable Tubing Limit of Tubing Limit of Elevation Required Amount of

Model Length at Shipment Length (L) Difference (H) Additional Refrigerant

(ft.) (ft.) (ft.) (oz./ft.)*

CS-KS12NB41 25 65 23 0.16

CS-KS18NB4UW 25 100 50 0.27

* If total tubing length becomes 25 to 65 ft. (Max.) or 25 to 100 ft. (Max.), charge additional refrigerant (R410A) by 0.16 or 0.27 oz./ft.

No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.

2-2. Outdoor Unit

AVOID:

 heat sources, exhaust fans, etc. (Fig. 3)

 damp, humid or uneven locations.

DO:

 choose a place as cool as possible.

 choose a place that is well ventilated.

 install in a location where at least two sides are unob-

structed, so that the flow of air at the intake port or exhaust port is not blocked, and so that sufficient space is ensured for maintenance to be carried out without trouble. In general the top also must be unobstructed. (Figs. 4a and 4b)

 provide a solid base (level concrete pad, concrete

block, 4"  1'4" (10  40 cm) beams or equal), a minimum of 4" (10 cm) above ground level to reduce humidity and protect the unit against possible water damage and decreased service life. (Fig. 5a)

 install cushion rubber under unit’s feet to reduce

vibration and noise. (Fig. 5b)

 use lug bolts or equal to bolt down unit, reducing

vibration and noise.

 install in a location where no antenna of a television

or radio exists within 10' (3 m).

Hot air

Outdoor unit

Fig. 3

(CU-KS12NK1A)

Air intake Min. 2" (5 cm)

Min.

2" (5 cm)

Air discharge

(CU-KS18NKU, CU-KS18NKUA)

Air intake Min. 4" (10 cm)

Min.

2" (5 cm)

Air discharge

Valve side Min. 10" (25 cm)

Min. 8" (20 cm)

Fig. 4a

Valve side Min. 10" (25 cm)

Min. 1'4" (40 cm)

Exhaust fan

Heat source

Obstacle above

Ground

Obstacle above

Min.

7' (2 m)

Air discharge

Min. 2" (5 cm)

Air intake

Min.

7' (2 m)

Air discharge

Min.

7' (2 m)

Obstacle

Min.

7' (2 m)

Obstacle

Air intake

Concrete or equal

About 1'4" (40 cm)

Anchor bolts (4 pcs.)

Min. 4" (10 cm)

About 4" (10 cm)

Fig. 4b

Fig. 5a Fig. 5b

Ground

Cushion rubber

Min. 4" (10 cm)

Air intake

2-3. Baffle Plate for the Outdoor Unit

(Low Ambient Cooling models only)

Air intake baffle

NOTE

It is recommended to use baffle plates for models CU-KS12NK1A and CU-KS18NKUA. The baffle plates are not normally required for the other models.

When the outdoor unit is installed in a position exposed to strong wind (such as seasonal winds with low air temperature in winter), baffle plates must be installed on the outdoor unit. (Fig. 5c)

This unit is designed so that the fan of the outdoor unit runs at low speed when the air conditioner is operated at low outdoor air temperatures. When the outdoor unit is exposed to strong wind, the system pressure drops because of the freeze protector.

Install a pair of windbaffle plates at the front and back of the outdoor unit if it will be subject to strong wind during the winter. (Figs. 5c to 5k)

Wind

Back

No air intake baffle required on this side.

Front

Wind

Air discharge baffle

Fig. 5c

 CU-KS12NK1A

(1) Recommended dimensions of the baffle plates

Air Intake Baffle

2- 1/4"

(2- 6.5 mm)

Fig. 5d

2- 15/64"

(2- 6 mm)

Air Discharge Baffle

4- 1/4"

(4- 6.5 mm)

Fig. 5e

For Air Intake

Dimensions

Model

CU-KS12NK1A

(inch)

(mm) 550 20 55 440 330 10 15 9 7.5 441 10 150 20 20

ABCDE FGH I J KNPQ

21-21/32

25/32 2-5/32 17-5/16 13 25/64 19/32 23/64 19/64 17-3/8 25/64 5-29/32 25/32 25/32

For Air Discharge

Dimensions

Model

CU-KS12NK1A

(inch)

(mm) 485 510 350 150 445 20 55 370 70 85 15 35 35

ABCDE FGH I J K LM

19-3/32 20-3/32

13-25/32

5-29/32

17-17/32

25/32 2-5/32 14-9/16 2-3/4 3-11/32 19/32 1-3/8 1-3/8

Material to be used: Metal plate with corrosion protection treatment Plate thickness: 0.0394 to 0.0472" (1.0 to 1.2 mm)

(2) Parts required (locally purchased except for screws)

Air Intake Baffle

Item Q’ty Remarks

Baffle plate 1

Screw 5/32  15/32" (4  12 mm) tapping 2 Attached to outdoor unit

Bolt 15/64  19/32 – 25/32" (M6  15 – 20 mm) 2

Nut 15/64" (M6) 2

Washer 2

Spring washer 2

Air Discharge Baffle

Item Q’ty Remarks

Baffle plate 1

Bolt 15/64  13/32 – 19/32" (M6  10 – 15 mm) 4

Nut 15/64" (M6) 4

Washer 4

Spring washer 4

 CU-KS18NKUA

(1) Recommended dimensions of the baffle plates

Air Intake Baffle

Air Discharge Baffle

2- 15/64"

(2- 6 mm)

3- 1/4"

(3- 6.5 mm)

Fig. 5f Fig. 5g

(4- 6.5 mm)

4- 1/4"

For Air Intake

Dimensions

Model

CU-KS18NKUA

(inch)

(mm) 620 20 45 565 235 235 10 20 15 587 7.5 10 150 20 20

ABCDE FGH I J K LOQR

24-13/32

25/32 1-25/32 22-1/4 9-1/4 9-1/4 25/64 25/32 19/32 23-1/8 19/64 25/64 5-29/32 25/32 25/32

For Air Discharge

Dimensions

Model

CU-KS18NKUA

(inch)

(mm) 530 560 350 150 460 35 55 440 60 85 25

ABCDE FGH I J K

20-7/8 22-1/16

13-25/32

5-29/32 18-1/8 1-3/8 2-5/32 17-5/16 2-3/8 3-11/32 31/32

Material to be used: Metal plate with corrosion protection treatment Plate thickness: 0.0394 to 0.0472" (1.0 to 1.2 mm)

(2) Parts required (locally purchased except for screws)

Air Intake Baffle

Item Q’ty Remarks

Baffle plate 1

Screw 5/32  15/32" (4  12 mm) tapping 2 Attached to outdoor unit

Bolt 15/64  19/32 – 25/32" (M6  15 – 20 mm) 3

Nut 15/64" (M6) 3

Washer 3

Spring washer 3

Air Discharge Baffle

Item Q’ty Remarks

Baffle plate 1

Bolt 15/64  13/32 – 19/32" (M6  10 – 15 mm) 4

Nut 15/64" (M6) 4

Washer 4

Spring washer 4

(3) Installation procedure

 CU-KS12NK1A

1. Air Intake Baffle

(1) Left side

1. Remove the front panel from the unit.

2. Remove the panel side L, and drill 2 holes of ø1/4 inch (6.5 mm) at the prescribed position.

3. Install the windbaffle on the unit using field supply bolts and nuts.

4. Recommended bolts to be used are 15/64" (M6 ISO standard), and the recommended length of the bolts is between 19/32 – 25/32 inch (15 – 20 mm).

5. Use washers and spring washers to tightly fasten the windbaffle to the unit.

(2) Right side

1. Remove the front panel from the unit.

2. Use 2 preholes on the panel side R to install the baffle plate.

3. Remove the panel side R from the unit by removing the screws. These screws are used in step 4 below.

4. Put (sandwich) the windbaffle between the unit and the panel side R, then install the windbaffle on the unit using the above screws. Be careful not to damage the screw holes.

2. Air Discharge Baffle

1. Remove the panels front, side L and R from the unit and drill 4 holes of ø1/4 inch (6.5 mm) at the prescribed positions.

2. Install the windbaffle on the unit using field supply bolts and nuts.

3. Recommended bolts to be used are 15/64" (M6 ISO standard), and the recommended length of the bolts is between 13/32 – 19/32 inch (10 – 15 mm).

4. Use washers and spring washers to tightly fasten the windbaffle to the unit.

Panel side R

Fig. 5h

Panel front

Panel side L

Fig. 5i

Panel side R

Panel front

NOTE

 In order to prevent contact of the bolts and heat exchanger and other parts inside the unit, install the windbaffle using

bolts from inside the unit and fasten the bolts with nuts from outside the unit.

 When the windbaffle is installed on the unit, the unit has higher wind resistance. In order to prevent the unit from

falling over, anchor the legs of the unit using anchor bolts (or similar method).

 CU-KS18NKUA

1. Air Intake Baffle

(1) Left side

1. Remove the top panel from the unit.

2. Remove the panel side L, and drill 3 holes of ø1/4 inch (6.5 mm) at the prescribed positions.

3. Install the windbaffle on the unit using field supply bolts and nuts.

4. Recommended bolts to be used are 15/64" (M6 ISO standard), and the recommended length of the bolts is between 19/32 – 25/32 inch (15 – 20 mm).

5. Use washers and spring washers to tightly fasten the windbaffle to the unit.

(2) Right side

1. Remove the top panel from the unit.

2. Use 2 preholes on the panel side R to install the baffle plate.

3. Remove the panel side R from the unit by removing the screws. These screws are used in step 4 below.

4. Put (sandwich) the windbaffle between the unit and the panel side R, then install the windbaffle on the unit using the above screws. Be careful not to damage the screw holes.

Panel top

Panel front

2. Air Discharge Baffle

1. Remove the panels front, top, side L and R from the unit and drill 4 holes of ø1/4 inch (6.5 mm) at the prescribed positions.

2. Install the windbaffle on the unit using field supply bolts and nuts.

3. Recommended bolts to be used are 15/64" (M6 ISO standard), and the recommended length of the bolts is between 13/32 – 19/32 inch (10 – 15 mm).

4. Use washers and spring washers to tightly fasten the windbaffle to the unit.

Panel side R

Panel top

Panel side R

Panel front

Panel side L

Fig. 5j

Fig. 5k

NOTE

 In order to prevent contact of the bolts and heat exchanger and other parts inside the unit, install the windbaffle using

bolts from inside the unit and fasten the bolts with nuts from outside the unit.

 When the windbaffle is installed on the unit, the unit has higher wind resistance. In order to prevent the unit from

falling over, anchor the legs of the unit using anchor bolts (or similar method).

(4) Precautions for installation

1. Be sure not to damage painted surfaces.

2. Finish the edges of the windbaffle to avoid cuts or injury.

3. Drilling of holes must be carefully done so that no damage is caused to external or internal parts of the unit. Particular care must be taken that drill chips do not drop into the unit.

3. How to Install the Indoor Unit

3-1. Preparation for Suspending

This unit uses a drain pump. Use a carpenter’s level to check that the unit is level.

3-2. Suspending the Indoor Unit

(1) Fix the suspension bolts securely in the ceiling using

the method shown in the diagrams, by attaching them to the ceiling support structure, or by any other method that ensures that the unit will be securely and safely suspended. (Fig. 6-1)

(2) Follow the diagram to make the holes in the ceiling.

Hole-in-anchor Hole-in-plug

Ceiling opening dimensions

21-1/32"(534

Suspension bolt pitch

Concrete Insert

Suspension bolt (M10 or 3/8") (locally purchased)

Fig. 6-1

23-5/8"(600mm)

)

(3) Determine the pitch of the suspension bolts using

the supplied full-scale installation diagram. The diagram shows the relationship between the positions of the suspension fitting, unit, and panel. (Fig. 6-2)

3-3. Placing the Unit Inside the Ceiling

(1) Be sure to remove the fan protection (4pcs) for

transportation before hanging up the indoor unit.

(2) When placing the unit inside the ceiling, determine

the pitch of the suspension bolts using the supplied full-scale installation diagram. (Fig. 6-3) Tubing and wiring must be laid inside the ceiling when suspending the unit. If the ceiling is already constructed, lay the tubing and wiring into position for connection to the unit before placing the unit inside the ceiling.

(3) The length of suspension bolts must be appropriate

for a distance between the bottom of the bolt and the bottom of the unit of more than 19/32" (15 mm) as shown in the diagram. (Fig. 6-3)

(4) Thread the 3 hexagonal nuts (locally purchased) and

2 supplied washers onto each of the 4 suspension bolts as shown in the diagram. Use 1 nut and 1 washer for the upper side, and 2 nuts and 1 washer for the lower side, so that the unit will not fall off the suspension lugs. (Fig. 6-4)

(5) Adjust so that the distance between the unit and the

ceiling bottom is 1/2" (13 mm) to 23/32" (18 mm). Tighten the nuts on the upper side and lower side of the suspension lug. (Fig. 6-4)

) mm

(45

1-25/32"

)

4-19/32"

(45

1-25/32"

(117

Power supply port

) mm

Over 19/32" (15

Supplied screw

Nuts and washers (used for upper and lower)

22-5/8"(575mm)

6-5/16"2-3/32"

6-11/16"

)(160mm)(53mm)

(170

Refrigerant tubing joint (narrow tube side) 1/4( 6.35mm) (flared)

Fig. 6-2

Full-scale installation diagram (printed on top of container box)

Fig. 6-3

Suspension bolt

)

23-5/8"(600

21-1/32"(534

Suspension bolt pitch

Ceiling opening dimensions

Drain tube connection port (outer dia 1-1/32"( 26mm))

) mm

(215

8-15/32"

11-5/32"(283

) mm

1-3/16"

(30

) mm

1/2" – 23/32" (13~18

Suspension lug

Double nut

1/2" – 23/32"

(13~18

Fig. 6-4

Notch

)

Panasonic CS-KS18B4UW, CS-KS12NB41, CU-KS12NK1A, CZ-18BT1U User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TECHNICAL & SERVICE MANUAL

SAFETY PRECAUTIONS

Table of Contents

1. OPERATING RANGE

2. SPECIFICATIONS

2-1. Unit Specifications

2-2. Major Component Specifications

2-3. Other Component Specifications

3. DIMENSIONAL DATA

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

5. PERFORMANCE DATA

5-1. Temperature Charts

5-2. Cooling Capacity

5-3. Cooling Capacity (Low Ambient)

6. ELECTRICAL DATA

6-1. Electrical Characteristics

6-2. Electric Wiring Diagrams

7. MAINTENANCE

7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit

7-3. Disassembly Procedure

8. FUNCTIONS

8-1. Operation Functions

8-2. Protective Functions

9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)

9-1. Precautions before Performing Inspection or Repair

9-2. Method of Self-Diagnostics

9-3. Checking the Indoor and Outdoor Units

9-4. Trouble Diagnosis of Fan Motor

9-5. Noise Malfunction and Electromagnetic Interference

10. CHECKING ELECTRICAL COMPONENTS

11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT

11-1. Characteristics of New Refrigerant R410A

11-2. Checklist before Servicing

11-3. Tools Specifically for R410A

11-4. Tubing Installation Procedures

11-5. In Case of Compressor Malfunction

11-6. In Case Refrigerant is Leaking

11-7. Charging Additional Refrigerant

11-8. Retro-Fitting Existing Systems