Panasonic CS-KE12NB41, CS-KE18NB4UW, CU-KE18NKU User Manual

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TECHNICAL & SERVICE MANUAL

CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU

DC INVERTER SPLIT SYSTEM AIR CONDITIONER

Indoor Model No.

Body (Panel)

CS-KE12NB41 (CZ-18BT1U)

CS-KE18NB4UW (CZ-18BT1U)

Product Code No.

Body (Panel)

1 852 361 05 (1 852 361 15)

1 852 361 07 (1 852 361 15)

Indoor Unit

Body

Panel

CS-KE12NB41 (Body) & CZ-18BT1U (Panel) CS-KE18NB4UW (Body) & CZ-18BT1U (Panel)

Outdoor Model No. Product Code No.

CU-KE12NK1

CU-KE18NKU

1 852 361 17

1 852 361 20

Outdoor Unit

CU-KE12NK1

Remote Controller

Wired Remote Controller

(Option)

CU-KE18NKU

REFERENCE NO. SM700880

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.

Table of Contents

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) 5-4. Heating Capacity

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7 13 17

23 27 29 31

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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33 35

38 39 40

47 49

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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60 61

62 63 64 64 65 67 68 68

APPENDIX A Operating Instructions

(CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)

APPENDIX B INSTALLATION INSTRUCTIONS

(CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)

APPENDIX C Operating Instructions

(CZ-RD515U)

APPENDIX D INSTALLATION INSTRUCTIONS

(CZ-RD515U)

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A-1

A-2

A-3

A-4

1. OPERATING RANGE

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

Cooling

Heating

Maximum

Minimum

Maximum

Minimum

95 °F DB / 71 °F WB

67 °F DB / 57 °F WB

80 °F DB / 67 °F WB

– DB / – WB

115 °F DB

0 °F DB

75 °F DB / 65 °F WB

– DB / 0 °F WB

2. SPECIFICATIONS

2-1. Unit Specifications

2-1-1.

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

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 COP W/W SEER BTU/Wh 16 HSPF BTU/Wh -

Electrical Rating

Compressor Locked Rotor Amperes 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

11,900

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

V A

12.6

WPower Input

1,260

%Power Factor 87

A20

( 3,000 to 11,900 )

3.5

( 0.9 to 3.5 )

( 2.5 to 12.6 ) ( 250 to 1,260 )

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

34 / 32 / 31

115V Single-Phase 60Hz

Cooling

7,200 4,700

4.26

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

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

Washable, Anti-Mold

DC Rotary (Inverter)

R410A / 2.43 (1,100)

Electric Expansion Valve

Heating

13,600

268(455) / 247(420) / 224(381)

104 to 126

1,460

Auto

Flare Type

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

( 3,000 to 13,600 )

4.0

( 0.9 to 4.0 )

14.6

( 2.5 to 14.6 ) ( 250 to 1,460 )

35 / 34 / 32

2.74

8.5

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

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 80 °F DB / 67 °F WB

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

Indoor Unit

(CS-KE12NB41 & 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-KE12NB41)

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-KE12NK1)

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 (35.0)77.2

Ib. (kg)

cu.ft (m

)

(38.0)83.8

(0.18)6.35

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Heating: Indoor air temperature 70 °F DB

Outdoor air temperature 47 °F DB / 43 °F WB

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)

2-1-2.

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

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 COP W/W SEER BTU/Wh 16 HSPF BTU/Wh -

Electrical Rating

Compressor Locked Rotor Amperes 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

17,500

5.15

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

V A

WPower Input

1,860

%Power Factor 97

A 17.5

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

8.3

( 1.2 to 8.3 ) ( 250 to 1,860 )

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

44 / 40 / 36

230V Single-Phase 60Hz

Cooling

10,600

6,900

4.89

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

Heating

20,400

383(651) / 324(551) / 265(450)

187 to 253

2,340

Auto

Flare Type

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

( 4,400 to 20,400 )

6.0

( 1.3 to 6.0 )

10.5

( 1.3 to 10.5 ) ( 270 to 2,340 )

44 / 40 / 36

2.56

8.5

< 230V >

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

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-KE18NB4UW & CZ-18BT1U)

(313)12-5/16

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

(18.7)41.3

)

Individual Unit

Body

(CS-KE18NB4UW)

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-KE18NKU)

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.

Heating: Indoor air temperature 70 °F DB

Outdoor air temperature 47 °F DB / 43 °F WB

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

(1,012)39-27/32 (379)14-29/32 (44.0)97.0 (48.0)105.8

(0.28)9.88

2-1-3.

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

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 COP W/W SEER BTU/Wh 16 HSPF BTU/Wh -

Electrical Rating

Compressor Locked Rotor Amperes 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

17,500

5.15

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

V A

WPower Input

1,860

%Power Factor 98

A 17.5

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

9.1

( 1.2 to 9.1 ) ( 250 to 1,860 )

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

44 / 40 / 36

208V Single-Phase 60Hz

Cooling

10,600

6,900

4.89

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

Heating

20,400

383(651) / 324(551) / 265(450)

187 to 253

2,340

Auto

Flare Type

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

( 4,400 to 20,400 )

6.0

( 1.3 to 6.0 )

11.5

( 1.3 to 11.5 ) ( 270 to 2,340 )

44 / 40 / 36

2.56

8.5

< 208V >

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

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

(CZ-KE18NB4UW & CZ-18BT1U)

(313)12-5/16

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

(18.7)41.3

)

Individual Unit

Body

(CS-KE18NB4UW)

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 80 °F DB / 67 °F WB

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

Outdoor Unit

(CU-KE18NKU)

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.

Heating: Indoor air temperature 70 °F DB

Outdoor air temperature 47 °F DB / 43 °F WB

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

(1,012)39-27/32 (379)14-29/32 (44.0)97.0 (48.0)105.8

(0.28)9.88

2-2. Major Component Specifications

2-2-1. Indoor Unit

Indoor Unit (Body) CS-KE12NB41

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 / Heat)

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-KE12NB4U

Microprocessor

250V 3A

Turbo

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

DC Motor

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

470 / 520

DC160V / 23W

Internal Controller

Ye s Ye s

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

MPZN-12V ... 2

DC 12V

Indoor Unit (Body) CS-KE18NB4UW

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 / Heat)

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-KE18NB4U

Microprocessor

250V 3A

Turbo

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

DC Motor

SIC-62FV-D866-2 ... 1

650 / 720

DC340V / 20WRating Voltage / Nominal Output

Thermal Fuse

Ye s Ye s

Drain Pump

Model ... Q'ty

Rating Voltage, Hz

Input

PLD-12230ST-1 ... 1

AC208 to 240V, 60Hz

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

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-KE12NK1

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-KE12NK1

Microprocessor

125V 25A

DC Rotary (Hermetic)

G4C090LU1ER / 900W

FV50S ... 0.68 (320)

U - V :

0.81

V - W :

W - U :

0.81

Ye s Ye s Ye s

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 / Heat)

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 / 750

RED - WHT :

WHT - BLU :

BLU - RED :

77.5

Internal Controller

Ye s

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-KE18NKU

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-KE18NKU

Microprocessor

250V 25A

DC Twin Rotary (Hermetic)

C-6RVN93H0M / 1,050W

FV50S ... 0.74 (350)

R - S :

0.482

S - T :

0.482

T - R :

0.482

Ye s Ye s Ye s

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 / Heat)

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 / 850

RED - WHT :

WHT - BLU :

BLU - RED :

77.5

Internal Controller

Ye s

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-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE12NK1 CU-KE18NKU

• Indoor air temp sensor

(Model:KTEC-35-S98)

• Indoor heat exchanger sensor

(Model:PT2M-51H-S3)

• Compressor temp sensor

(CU-KE12NK1 (CU-KE18NKU

...

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-KE12NK1 (CU-KE18NKU

...

Model:DTN-TKS269B)

...

Model:TKS295B)

• Outdoor heat exchanger sensor

(CU-KE12NK1 (CU-KE18NKU

...

Model:DTN-TKS274Y TH1)

...

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-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U

7-11/16

4-29/32

A View

1-3/16

21/32

3-1/8

(534)

21-1/32

23-5/8 (600)

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)

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")

22-5/8 (575)

2-3/32

3-5/8

7-23/32

1-27/32 1-3/32

Unit : inch (mm)

Outdoor Unit CU-KE12NK1

3-19/32

10-13/16

21-3/16

ID:23/32

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

4-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) (852-0-0010-12700-0)

Outdoor Unit CU-KE18NKU

23-15/16 5-11/32

1-3/8

11-17/32

ID:23/32

34-21/32(880)

4-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) (852-0-0010-13200-0)

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

Indoor unit Outdoor 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

Muffler

Narrow tube service valve

Strainer

4-way valve

Muffler

Accumulator

High pressure

switch

H.P.

Electric

expansion

valve

Capillary tube for split flow

Compressor

Heat exchanger

Cooling cycle (Defrosting cycle)

Heating cycle

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

Indoor unit Outdoor 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

Muffler

Narrow tube service valve

Strainer

4-way valve

Accumulator

High pressure

switch

H.P.

Electric

expansion

valve

Capillary tube for split flow

Compressor

Heat exchanger

Cooling cycle (Defrosting cycle)

Heating cycle

5. PERFORMANCE DATA

5-1. Temperature Charts

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

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

Indoor Air Temp.86°F (30°C)

Indoor Air Temp.86

F (27

80°F (27°C)

75°F (24°C)

(25)

(30)

Outdoor inlet air DB temp. °F(°C)

Hi FanLo Fan

Indoor Air Temp.86°F (30°C)

Indoor Air Temp.86

(35)

F (30

F (27

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.

NOTE

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

Hi FanLo Fan

F (30

Indoor Air Temp.86°F (30°C)

Indoor Air Temp.86

80°F (27°C)

75°F (24°C)

(30)

F (27

(35)

°F(°C)

104

(40)

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 115V)

(1) High pressure performance chart

(2) Operating current performance chart

508

(3.5)

435

psig(MPaG)

(3.0)

Indoor Air Temp.73°F (23°C)

363

(2.5)

290

(2.0)

218

High pressure at wide tube service valve

(1.5)

(

70°F (21°C)

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(25)

Outdoor inlet air DB temp. °F(°C)

Operating current (A)

(

(3) Indoor discharge air performance chart

131 (55)

122 (50)

113 (45)

104 (40)

(35)

(30)

(25)

Indoor discharge air temperature °F(°C)

(20)

(

Indoor Air Temp.73°F (23°C)

70°F (21°C)

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(25)

Outdoor inlet air DB temp. °F(°C)

Indoor Air Temp.73°F (23°C)

70°F (21°C)

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(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. Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in heating mode. (Refer to "8-2. Protective Functions Overload prevention during heating.")

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

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

Indoor Air Temp.86

(25)

(30)

Outdoor inlet air DB temp. °F(°C)

Hi FanLo Fan

Indoor Air

Indoor Air Temp

Temp.86°F (30°C)

F (27

80°F (27°C)

75°F (24°C)

(35)

Temp.86°F (30°C)

F (30

.86

F (27

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

Indoor Air Temp.86

(30)

Temp.86°F (30°C)

F (27

80°F (27°C)

75°F (24°C)

(35)

F (30

104

(40)

Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU

Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 230V)

(1) High pressure performance chart

(2) Operating current performance chart

508

(3.5)

435

psig(MPaG)

(3.0)

Indoor Air Temp.73°F (23°C)

70°F (21°C)

363

(2.5)

290

(2.0)

218

High pressure at wide tube service valve

(1.5)

(

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(25)

Outdoor inlet air DB temp. °F(°C)

Operating current (A)

(

(3) Indoor discharge air performance chart

131 (55)

122 (50)

113 (45)

104 (40)

(35)

(30)

(25)

Indoor discharge air temperature °F(°C)

(20)

(

Indoor Air Temp.73°F (23°C)

70°F (21°C)

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(25)

Outdoor inlet air DB temp. °F(°C)

Indoor Air Temp.73°F (23°C)

70°F (21°C)

63°F (17°C)

5)32(0)41(5)50(10)59(15)68(20)77(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.

• Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in heating mode. (Refer to "8-2. Protective Functions Overload prevention during heating.")

5-2. Cooling Capacity

Indoor Unit : CS-KE12NB41 & CZ-18BT1U

Outdoor Unit : CU-KE12NK1

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

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

(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

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

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)

NOTE

Rating conditions (#)

: 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

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.

Indoor Unit : CS-KE18NB4UW & CZ-18BT1U

Outdoor Unit : CU-KE18NKU

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

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)

NOTE

Rating conditions (#)

: 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

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.

5-3. Cooling Capacity (Low Ambient)

Indoor Unit : CS-KE12NB41 & CZ-18BT1U

Outdoor Unit : CU-KE12NK1

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-KE18NB4UW & CZ-18BT1U

Outdoor Unit : CU-KE18NKU

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.

5-4. Heating Capacity

Indoor Unit : CS-KE12NB41 & CZ-18BT1U

Outdoor Unit : CU-KE12NK1

Power Supply : 115V Single Phase 60Hz

< Heating Capacity >

RATING CAPACITY: 13,600 BTU/h AIR FLOW RATE: 268 CFM

OUTDOOR INDOOR

ENT. TEMP.

13 (-10.6) TH 8,980 9,000 9,030 9,050 9,060

18 (-7.8) TH 9,660 9,690 9,720 9,730 9,750

23 (-5.0) TH 10,390 10,420 10,440 10,460 10,470

28 (-2.2) TH 11,150 11,180 11,200 11,210 11,220

33 (0.6) TH 11,930 11,960 11,980 12,000 11,740

38 (3.3) TH 12,720 12,750 12,770 12,780 11,740

43 (6.1) TH 13,560 13,580 # 13,600 13,010 11,740

48 (8.9) TH 14,420 14,440 14,120 13,010 11,740

53 (11.7) TH 15,290 15,020 14,200 13,010 11,740

58 (14.4) TH 15,990 15,080 14,240 13,010 11,740

63 (17.2) TH 16,000 15,070 14,220 13,010 11,740

65 (18.3) TH 15,980 15,050 14,190 13,010 11,740

F (oC) AMBIENT TEMP. oF (oC)

WB 60 65 70 75 80

(15.6) (18.3) (21.1) (23.9) (26.7)

0 (-17.8) TH 7,510 7,540 7,560 7,580 7,590

3 (-16.1) TH 7,760 7,790 7,810 7,830 7,840

8 (-13.3) TH 8,350 8,380 8,410 8,420 8,440

0.84 0.88 0.92 0.96 1.00

0.86 0.90 0.94 0.98 1.02

0.89 0.94 0.98 1.03 1.07

0.93 0.98 1.03 1.08 1.12

0.98 1.03 1.08 1.13 1.18

1.03 1.08 1.14 1.19 1.25

1.08 1.14 1.20 1.26 1.32

1.13 1.20 1.26 1.33 1.39

1.19 1.26 1.33 1.40 1.44

1.25 1.32 1.40 1.44 1.44

1.31 1.39 1.44 1.44 1.44

1.44 1.44 1.44 1.44 1.44

TH : Total Heating Capacity (BTU/h)

NOTE

Rating conditions (#)

: Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB

Above data does not take Defrost Operation, Overload Prevention Protection, and/or Cold Air Prevention Protection during heating operation into account. For this reason, the value may vary from the actual heating characteristics.

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

Indoor Unit : CS-KE18NB4UW & CZ-18BT1U

Outdoor Unit : CU-KE18NKU

Power Supply : 230V Single Phase 60Hz

< Heating Capacity >

RATING CAPACITY: 20,400 BTU/h AIR FLOW RATE: 383 CFM

OUTDOOR INDOOR

ENT. TEMP.

13 (-10.6) TH 13,520 13,580 13,630 13,670 13,710

18 (-7.8) TH 14,540 14,600 14,650 14,700 14,730

23 (-5.0) TH 15,610 15,670 15,730 15,770 15,810

28 (-2.2) TH 16,730 16,800 16,850 16,890 16,770

33 (0.6) TH 17,900 17,960 18,010 18,060 16,770

38 (3.3) TH 19,050 19,120 19,170 18,590 16,770

43 (6.1) TH 20,290 20,350 # 20,400 18,590 16,770

48 (8.9) TH 21,550 21,610 20,410 18,590 16,770

53 (11.7) TH 22,830 22,230 20,410 18,590 16,770

58 (14.4) TH 23,990 22,230 20,410 18,590 16,770

63 (17.2) TH 23,990 22,230 20,410 18,590 16,770

65 (18.3) TH 23,990 22,230 20,410 18,590 16,770

F (oC) AMBIENT TEMP. oF (oC)

WB 60 65 70 75 80

(15.6) (18.3) (21.1) (23.9) (26.7)

0 (-17.8) TH 11,350 11,400 11,440 11,480 11,510

3 (-16.1) TH 11,720 11,770 11,820 11,850 11,890

8 (-13.3) TH 12,600 12,650 12,700 12,750 12,780

1.35 1.41 1.47 1.53 1.59

1.37 1.44 1.50 1.56 1.62

1.43 1.50 1.57 1.64 1.71

1.50 1.57 1.65 1.72 1.80

1.57 1.65 1.74 1.82 1.90

1.65 1.74 1.83 1.92 2.00

1.74 1.83 1.93 2.02 2.12

1.83 1.93 2.04 2.14 2.24

1.92 2.03 2.14 2.25 2.36

2.02 2.14 2.26 2.38 2.50

2.13 2.26 2.39 2.52 2.64

2.39 2.53 2.53 2.66 2.80

2.37 2.52 2.67 2.81 2.96

2.51 2.67 2.82 2.98 3.13

2.57 2.73 2.89 3.05 3.21

TH : Total Heating Capacity (BTU/h)

NOTE

Rating conditions (#)

: Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB

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

6. ELECTRICAL DATA

6-1. Electrical Characteristics

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit

Cooling

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

Heating

Performance at 115V Single-phase 60Hz Rating conditions Running amp. A 0.25

CU-KE12NK1

Power input W 18

Power input W 20

Indoor Unit Outdoor Unit Complete Unit

Fan Motor Fan Motor + Compressor

12.39 1,242

Indoor Unit Outdoor Unit Complete Unit

Fan Motor Fan Motor + Compressor

14.35 1,440

12.6

1,260

14.6

1,460

Rating conditions: Indoor air temperature 70 °F (21.1 °C) DB Outdoor air temperature 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB

Indoor Unit CZ-KE18NB4U & CZ-18BT1U Outdoor Unit

(1) Voltage:230V

CU-KE18NKU

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

Heating

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 230V Single-phase 60Hz Rating conditions Running amp. 0.19

Power input 27

Rating conditions: Indoor air temperature 70 °F (21.1 °C) DB Outdoor air temperature 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB

10.31 2,313

(2) Voltage:208V

230V

Complete Unit

8.3

1,860

Complete Unit

10.5

2,340

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

Heating

Indoor Unit Outdoor Unit

Fan Motor Fan Motor + Compressor Performance at 208V Single-phase 60Hz Rating conditions Running amp. 0.2

Power input 27

Rating conditions: Indoor air temperature 70 °F (21.1 °C) DB Outdoor air temperature 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB

11.3

2,313

208V

Complete Unit

9.1

1,860

Complete Unit

11.5

2,340

6-2. Electric Wiring Diagrams

Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & 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

CORE

FERRITE

VLT

BLU

PNK

GRN/YEL

YEL/(RED) YEL/(RED)

BLU YEL

WHT

BLK

RED

WHT

BLK

SERIAL

2P (WHT)

1 1

2 2

RED

GRN

WHT

1 1

2 2

SERIAL

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

3P (BLU)

BOX BOX

2P (WHT)

3P (RED)

CONTROLLER CONTROLLER

DCM

6P (BLU)

6P (WHT)

1 2 3 4 5 6

AC1 AC2 SI

Outdoor Unit CU-KE12NK1

8FA2-5251-12200-2

Outdoor Unit CU-KE18NKU

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

THERMISTOR

OVERLOAD RELAY

WHT

L1 L2 E1

CONTROLLER

DCFM MV0

2 3 4 5 6 7

BLK

WHT

1 2

3 4

1 2 4 5 6 73

BLK

WHT

7P-CONNECTOR (WHT)

FAN MOTOR

WHT WHT

1 2 3 4 5 1 2 43

YEL

BLU

RED

5 6 7

RED

ORG

1 2123 4345

YEL

BLU

MAGNETIC COIL

2P-CONNECTOR (RED)

BLK

1234 1 2 43

BLK

(OLR)

BLK

OUT DOOR

COIL/OUTDOOR

1234 1 2 43

YEL

THERMISTOR

COIL

THERMISTOR

GRN

E2 E

25A

ACIN1

ACIN2

SI-A

RV0 RV1

w w

YEL

RED

GRY

WHT

112

MV0

4WAY VALVE

COIL

BLK

RED

GRN

BLK

RED

BLK

WHT

RED

(WHT)

2P-CONNECTOR

WHT WHT

BLK

POWER RELAY

BLK

FERRITE CORE

BLK

WHT

HIGH PRESSURE

BLK

121 2

BLK

2P-CONNECTOR (BLK)

TERMINAL

PLATE

GND

POWER

SUPPLY

GND

SWITCH

TO INDOOR UNIT

8FA2-5251-11900-2

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 HEAT STOP

(GREEN) (RED) (Lamp Off)

• The set temperature is 4°F(2°C) below the detected room temperature in the case of cooling operation, and 4°F(2°C) above the room temperature in the case of heating operation. The flap and fan speed settings are AUTO.

AUTO cooling/heating operation

Selecting the operation mode

• When AUTO mode is selected, the microprocessor calculates the difference between the set temperature and the room temperature, and automatically switches to Cooling or Heating mode.

Room temp. Set temp. COOL Room temp. Set temp. HEAT

• As shown by the example in the figure below, with AUTO cooling/heating operation, the mode changes between Heating and Cooling mode according to changes in the relationship between the current room temperature and the set temperature.

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

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

temperature.

• When the monitoring range is entered, the compressor stops, and the indoor fan operates with 1/f fluctuation.

Example

Example of operation in AUTO mode with the set room temperature at 74°F(23°C).

Room temp.

Set temp.

Zone A

Zone B

Zone C

Zone B

Zone A

Compressor

Operation mode

More than

1 hour

ON ON ON

OFF OFF

Within

1 hour

HeatingCooling Cooling

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.

Lamp colors

OPERATION lamp

HEAT operation Red DRY operation Orange COOL operation Green FAN operation Green DEFROSTING operation Red and Orange alternately

OPERATION lamp Green

TIMER lamp Green

HIGH POWER lamp Green

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

HEAT mode

When the night setback mode is selected, the air conditioner automatically lowers the temperature setting 4°F(2°C) when 30 minutes have passed after the selection was made, and then another 4°F(2°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 heating is needed.

Setting temperature

Press the NIGHT SETBACK button

4°F(2°C)

30 min. 30 min.

4°F(2°C)

Time

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

Overload prevention during heating

During HEAT operation, the temperature of the indoor heat exchanger is used to control the frequency and lessen the load on the compressor before the protective device is activated.

Approx.

127

(53)

Approx.

117

(47)

temperature °F(°C)

Indoor heat exchanger

Area: Automatic capacity control

When Point A has been exceeded, the operation frequency is

abc d

Indoor heat exchanger

A. Control start B. Control end

reduced by a certain proportion.

Area: Frequency increase is prohibited.

At Point B and below, overload prevention is ended and

control is the same as in the

area.

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)

Cold-air prevention during heating

During heating, the fan speed is set to "LL" (very low) or stopped. As the temperature of the indoor heat exchanger rises, the fan speed is changed to the set speed.

High

Stopped

At stability of operation

(25)86(30)

Indoor heat exchanger

temperature °F(°C)

Set fan speed

At start of operation

Approx. 104

(40)

NOTE

• The fan speed is forcibly changed to "LL" beginning 30 seconds after the thermostat turns OFF.

• At stability of operation refers to operation when the room temperature has approached the set temperature.

• When HEAT operation starts, the indoor fan is stopped until the temperature of the indoor heat exchanger reaches 68°F(20°C) or higher, or until the room temperature reaches 59°F(15°C) or higher.

Compressor discharge temperature control

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

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.

* 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.

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.

Defrost detection and release

Reverse-Cycle Defrosting

Defrosting Sequence

Heating operation

Outdoor fan ON 4-way valve ON

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 / heating 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-KE12NB41>

Cooling Dry Heating

Peak current cut-off trips 22.5

Hz down 14.0 15.0

Frost sensing

Defrost detection occurs in either of the following cases:

•

The temperature of the heat exchanger remains at or below the L1 line for 3 minutes after the start of HEAT operation.

•

The temperature of the heat exchanger remains at or below the L2 line for 120 minutes after the start of HEAT operation.

Outdoor heat

exchanger temp.

L2 L1

Frosting area

Ambient temp.

Reverse-cycle defrosting operation

Compressor 1 minute after it is stopped, compressor is ON. Outdoor fan OFF Indoor fan OFF 4-way valve OFF Operation lamp

Repeatedly switches between red and orange illumination.

Cooling Dry Heating

Peak current cut-off trips 17.5

Hz down 11.0 14.0

NOTE

Electrical current setting for COOL operation is used during DEFROST operation.

(A)<CS-KE18NB4UW>

Releasing of defrosting

Outdoor heating exchanger temp. is over 68 Defrosting operation lasts 12 minutes (maximum). 2 minutes after it is stopped, compressor is ON. 4-way valve is ON. Outdoor fan is ON.

NOTE

If the air conditioner is turned off during the defrosting cycle, it will continue defrosting and turn itself off after defrosting is completed.

F(20°C).

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 : Off

High Power

: 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)

Ye s

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

Powe r

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

Powe r

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 ?

Ye s

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-KE12NB41 (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-KE18NB4UW 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.

Panasonic CS-KE12NB41, CS-KE18NB4UW, CU-KE18NKU User Manual

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Frequently Asked Questions

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