TECHNICAL & SERVICE MANUAL
CS-KS18NKU + CU-KS18NKU
+ CU-KS18NKUA
CS-KS24NKU + CU-KS24NKU
+ CU-KS24NKUA
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No.
CS-KS18NKU
CS-KS24NKU
Indoor Unit
CS-KS18NKU
CS-KS24NKU
Product Code No.
1 852 360 90
1 852 360 91
Outdoor Model No.
CU-KS18NKU
CU-KS18NKUA
CU-KS24NKU
CU-KS24NKUA
Product Code No.
1 852 361 18
1 852 361 19
1 852 361 21
1 852 361 22
Outdoor Unit
ONER
DITI
N
CO
AIR
CU-KS18NKU
CU-KS18NKUA
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
CU-KS24NKU
CU-KS24NKUA
REFERENCE NO. SM700872
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
Prohibit
Prohibit
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.
2
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
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
Prohibit
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.
3
Table of Contents
Page
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. Air Throw Distance Charts
6. ELECTRICAL DATA
6-1. Electrical Characteristics
6-2. Electric Wiring Diagrams
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6
7
15
21
22
25
26
30
32
34
36
38
7. MAINTENANCE
7-1. Address Setting of the Remote Control Unit
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit
8. FUNCTIONS
8-1. Operation Functions
8-2. Protective Functions
9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
9-1. Precautions before Performing Inspection or Repair
9-2. Method of Self-Diagnostics
9-3. Checking the Indoor and Outdoor Units
9-4. Trouble Diagnosis of Fan Motor
9-5. Noise Malfunction and Electromagnetic Interference
10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation Resistance
10-2. Checking Continuity of Fuse on PCB Ass'y
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42
43
44
46
47
47
50
54
56
57
58
4
11. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1. Characteristics of New Refrigerant R410A
11-2. Checklist before Servicing
11-3. Tools Specifically for R410A
11-4. Tubing Installation Procedures
11-5. In Case of Compressor Malfunction
11-6. In Case Refrigerant is Leaking
11-7. Charging Additional Refrigerant
11-8. Retro-Fitting Existing Systems
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Page
59
60
61
61
62
64
65
65
APPENDIX A Operating Instructions
............................................................................................
APPENDIX B INSTALLATION INSTRUCTIONS
............................................................................
A-1
A-2
5
1. OPERATING RANGE
Models:CS-KS18NKU + CU-KS18NKU
CS-KS24NKU + CU-KS24NKU
Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.
Cooling
Models:CS-KS18NKU + CU-KS18NKUA
CS-KS24NKU + CU-KS24NKUA
Cooling
Maximum
Minimum
Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.
Maximum
Minimum
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
F DB / 71 °F WB
95 °
67 °F DB / 57 °F WB
115 °F DB
67 °F DB
115 °F DB
0 °F DB
6
2. SPECIFICATIONS
2-1. Unit Specifications
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKU
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 11.7
SEER BTU/Wh 20
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 15
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × W
Weight
Dimensions & Weight
Shipping Volume
idth × Depth
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 93
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 26-3/8 × 34-21/32 × 11-7/32
(298 × 1,065 × 219) (670 × 880 × 285)
11-27/32 × 45-1/8 × 15-5/32
26.5
33.1
3
)
4.59 (0.13)
230V Single-Phase 60Hz
17,500
5.15
524 (890) / 441 (749) / 377 (641)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
7.0
1,500
Microprocessor / I.C. Thermistor
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 Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 17,500 )
( 1.2 to 5.15 )
13,100
4,400
4.89Moisture Removal (High) Pints/h
187 to 253
( 1.2 to 7.0 )
( 250 to 1,500 )
Manual
Auto
ion Valve
42 / 38 / 30 / 28
51
Flare Type
25 (7.5)
1/4 (6.35)
1/2 (12.7)
Optional
28-27/32 × 39-27/32 × 14-29/32
(733 × 1,012 × 379)(301 × 1,146 × 385)
Outdoor UnitIndoor Unit
90.4
99.2
9.88
< 230V >
(41.0)
(45.0)
(0.28)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
7
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKU
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 11.7
SEER BTU/Wh 20
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 15
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 94
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 26-3/8 × 34-21/32 × 11-7/32
(298 × 1,065 × 219) (670 × 880 × 285)
11-27/32 × 45-1/8 × 15-5/32
26.5
33.1
3
)
4.59 (0.13)
208V Single-Phase 60Hz
17,500
5.15
524 (890) / 441 (749) / 377 (641)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
7.7
1,500
Microprocessor / I.C. Thermistor
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 Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 17,500 )
( 1.2 to 5.15 )
13,100
4,400
4.89Moisture Removal (High) Pints/h
187 to 253
( 1.2 to 7.7 )
( 250 to 1,500 )
Manual
Auto
ion Valve
42 / 38 / 30 / 28
51
Flare Type
25 (7.5)
1/4 (6.35)
1/2 (12.7)
Optional
28-27/32 × 39-27/32 × 14-29/32
(733 × 1,012 × 379)(301 × 1,146 × 385)
Outdoor UnitIndoor Unit
90.4
99.2
9.88
< 208V >
(41.0)
(45.0)
(0.28)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
8
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKU
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 9.8
SEER BTU/Wh 17
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 20
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 99
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 29-1/8 × 35-7/16 × 12-19/32
(298 × 1,065 × 219) (740 × 900 × 320)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
230V Single-Phase 60Hz
24,200
7.1
659 (1,120) / 571 (970) / 494 (839)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
10.8
2,460
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Auto and 3 steps / Auto (Hi, Me, Lo)
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 24,200 )
( 1.2 to 7.1 )
14,800
9,400
4.89Moisture Removal (High) Pints/h
187 to 253
( 1.3 to 10.8 )
( 280 to 2,460 )
Manual
Auto
ion Valve
47 / 44 / 41 / 30
55
Flare Type
33 (10)
1/4 (6.35)
5/8 (15.88)
Optional
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
Outdoor UnitIndoor Unit
119.0
127.9
13.41
< 230V >
(54.0)
(58.0)
(0.38)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
9
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKU
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 9.8
SEER BTU/Wh 17
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 20
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 98
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 29-1/8 × 35-7/16 × 12-19/32
(298 × 1,065 × 219) (740 × 900 × 320)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
208V Single-Phase 60Hz
24,200
7.1
659 (1,120) / 571 (970) / 494 (839)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
12.1( 1.3 to 12.1 )
2,460 ( 280 to 2,460 )
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Auto and 3 steps / Auto (Hi, Me, Lo)
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 24,200 )
( 1.2 to 7.1 )
14,800
9,400
4.89Moisture Removal (High) Pints/h
187 to 253
Manual
Auto
ion Valve
47 / 44 / 41 / 30
55
Flare Type
33 (10)
1/4 (6.35)
5/8 (15.88)
Optional
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
Outdoor UnitIndoor Unit
119.0
127.9
13.41
< 208V >
(54.0)
(58.0)
(0.38)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
10
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKUA
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 11.7
SEER BTU/Wh 20
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 15
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 93
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi and multi steps)
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 26-3/8 × 34-21/32 × 11-7/32
(298 × 1,065 × 219) (670 × 880 × 285)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
230V Single-Phase 60Hz
17,500
5.15
524 (890) / 441 (749) / 377 (641)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
7.0
1,500
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 17,500 )
( 1.2 to 5.15 )
13,100
4,400
4.89Moisture Removal (High) Pints/h
187 to 253
( 1.2 to 7.0 )
( 250 to 1,500 )
Manual
Auto
ion Valve
42 / 38 / 30 / 28
51
Flare Type
25 (7.5)
1/4 (6.35)
1/2 (12.7)
Optional
28-27/32 × 39-27/32 × 14-29/32
(733 × 1,012 × 379)
Outdoor UnitIndoor Unit
90.4
99.2
9.88
< 230V >
(41.0)
(45.0)
(0.28)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
11
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKUA
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 11.7
SEER BTU/Wh 20
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 15
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 94
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi and multi steps)
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 26-3/8 × 34-21/32 × 11-7/32
(298 × 1,065 × 219) (670 × 880 × 285)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
208V Single-Phase 60Hz
17,500
5.15
524 (890) / 441 (749) / 377 (641)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
7.7
1,500
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 17,500 )
( 1.2 to 5.15 )
13,100
4,400
4.89Moisture Removal (High) Pints/h
187 to 253
( 1.2 to 7.7 )
( 250 to 1,500 )
Manual
Auto
ion Valve
42 / 38 / 30 / 28
51
Flare Type
25 (7.5)
1/4 (6.35)
1/2 (12.7)
Optional
28-27/32 × 39-27/32 × 14-29/32
(733 × 1,012 × 379)
Outdoor UnitIndoor Unit
90.4
99.2
9.88
< 208V >
(41.0)
(45.0)
(0.28)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
12
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKUA
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 9.8
SEER BTU/Wh 17
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 20
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 99
A 17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi and multi steps)
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 29-1/8 × 35-7/16 × 12-19/32
(298 × 1,065 × 219) (740 × 900 × 320)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
230V Single-Phase 60Hz
24,200
7.1
659 (1,120) / 571 (970) / 494 (839)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
10.8 ( 1.3 to 10.8 )
2,460 ( 280 to 2,460 )
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expansion Valve
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 24,200 )
( 1.2 to 7.1 )
14,800
9,400
4.89Moisture Removal (High) Pints/h
187 to 253
Manual
Auto
47 / 44 / 41 / 30
55
Flare Type
33 (10)
1/4 (6.35)
5/8 (15.88)
Optional
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
Outdoor UnitIndoor Unit
119.0
127.9
13.41
< 230V >
(54.0)
(58.0)
(0.38)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
13
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKUA
Voltage Rating
Total Capacity
Sensible Capacity
Latent Capacity
Performance
Available Voltage Range
Running Amperes
EER BTU/h/W 9.8
SEER BTU/Wh 17
Compressor Locked Rotor Amperes
Electrical Rating
Fuse or Circuit Breaker Capacity A 20
Controls / Temperature Control
Control Unit
Timer
Indoor / OutdoorFan Speeds
Airflow Direction (Indoor) Horizontal
Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Features
Refrigerant Control
Operation Sound
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Refrigerant inch (mm)
Tube Diameter inch (mm)
Refrigerant Tube Kit
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
Weight
Dimensions & Weight
Shipping Volume
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
Narrow tube
Wide tube
Net
Shipping
BTU/h
kW
BTU/h
BTU/h
V
A
WPower Input
%Power Factor 98
A17.5
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi and multi steps)
Vertical
dB-A
dB-A
ft (m)Max. allowable tubing length at shipment
inch
(mm)
inch
(mm)
Ibs (kg)
Ibs (kg)
cu.ft (m
11-23/32 × 41-15/16 × 8-5/8 29-1/8 × 35-7/16 × 12-19/32
(298 × 1,065 × 219) (740 × 900 × 320)
11-27/32 × 45-1/8 × 15-5/32
(301 × 1,146 × 385)
26.5
33.1
3
)
4.59 (0.13)
208V Single-Phase 60Hz
24,200
7.1
659 (1,120) / 571 (970) / 494 (839)Air Circulation (Hi/Me/Lo) ft3/min (m3/h)
12.1( 1.3 to 12.1 )
2,460 ( 280 to 2,460 )
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expans
(12.0)
(15.0)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Cooling
( 4,000 to 24,200 )
( 1.2 to 7.1 )
14,800
9,400
4.89Moisture Removal (High) Pints/h
187 to 253
Manual
Auto
ion Valve
47 / 44 / 41 / 30
55
Flare Type
33 (10)
1/4 (6.35)
5/8 (15.88)
Optional
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
Outdoor UnitIndoor Unit
119.0
127.9
13.41
< 208V >
(54.0)
(58.0)
(0.38)
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
14
2-2. Major Component Specifications
2-2-1. Indoor Unit
Indoor Unit CS-KS18NKU
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)
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)
W
Ohm
VAC
CB-CS-KS18NKU
Microprocessor
250V 3A
Cross-Flow
1 ... D3-5/8 / L33-9/32 (D92/L845)
DC Motor
SIC-41CVJ-D847-3 ... 1
8
1,250
30
-
Internal Controller
Yes
Yes
-
-
Flap Motor
Type Stepping Motor
Model
Rating
Coil Resistance Ohm
(Ambient Temp. 77 °F (25 °C))
Heat Exchanger Coil
Coil
Rows
Fins per inch
ft
2
(m2)
Each Pair of Terminal : 400 +/- 7%
Aluminum Plate Fin / Copper Tube
3.07 (0.285) Face Area
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
MP24Z3
DC 12V
2
19.5
15
Indoor Unit CS-KS24NKU
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)
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)
W
Ohm
VAC
CB-CS-KS24NKU
Microprocessor
250V 3A
Cross-Flow
1 ... D3-5/8 / L33-9/32 (D92/L845)
DC Motor
SIC-41CVJ-D847-3 ... 1
8
1,500
30
-
Internal Controller
Yes
Yes
-
-
Flap Motor
Type Stepping Motor
Model
Rating
Coil Resistance Ohm
Each Pair of Terminal : 400 +/- 7%
(Ambient Temp. 77 °F (25 °C))
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
Fins per inch
ft
2
(m2)
3.07 (0.285) Face Area
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
MP24Z3
DC 12V
2
19.5
16
2-2-2. Outdoor Unit
Outdoor Unit CU-KS18NKU
Control PCB
Part No.
Controls
Control Circuit Fuse
Compressor
Type
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C))
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Overload Relay
Run Capacitor
Crankcase Heater
Pints (cc)
Ohm
Model
Operation Temp.
Micro F
VAC
CB-CU-KS18NKU
Microprocessor
250V 25A
DC Twin Rotary (Hermetic)
C-6RVN93H0M / 1,050W
FV50S ... 0.74 (350)
U - V :
0.482
V - W :
W - U :
0.482
0.482
Yes
Yes
Yes
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
-
-
-
Fan
Type
Q'ty ... Dia. inch (mm)
Fan Motor
Type
Model ... Q'ty
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
Coil Resistance
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Over- Current Protection
Run Capacitor
Heat Exchanger Coil
Coil
Rows
Fins per inch
Face Area
W
Ohm
Micro F
VAC
2
ft
(m2)
Propeller
1 ... D16-17/32 (D420)
DC Motor
SIC-67FV-F460-1 ... 1
8
820
50
RED - WHT :
WHT - BLU :
BLU - RED :
77.5
77.5
77.5
Internal Controller
Yes
-
-
Aluminum Plate Fin / Copper Tube
2
21.2
5.49 (0.510)
External Finish Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
17
Outdoor Unit CU-KS24NKU
Control PCB
Part No.
Controls
Control Circuit Fuse
Compressor
Type
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 77 °F (25 °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-KS24NKU
Microprocessor
250V 25A
DC Twin Rotary (Hermetic)
G8T265FU1JW / 2,410W
FV50S ... 1.49 (700)
U - V :
0.36
V - W :
W - U :
0.36
0.36
Yes
Yes
Yes
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
-
-
-
Fan
Type
Q'ty ... Dia. inch (mm)
Fan Motor
Type
Model ... Q'ty
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
Coil Resistance
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Over-Current Protection
Over-Heat Protection
Run Capacitor
Heat Exchanger Coil
Coil
Rows
Fins per inch
Face Area
W
Ohm
Micro F
VAC
2
ft
(m2)
Propeller
1 ... D18-1/8 (D460)
DC Motor
SIC-71FW-D490-1 ... 1
8
850
90
-
Internal Controller
Yes
Yes
-
-
Aluminum Plate Fin / Copper Tube
2
18.1
6.40 (0.595)
External Finish Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
18
Outdoor Unit CU-KS18NKUA
Control PCB
Part No.
Controls
Control Circuit Fuse
Compressor
Type
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C))
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Overload Relay
Run Capacitor
Crankcase Heater
Pints (cc)
Ohm
Model
Operation Temp.
Micro F
VAC
CB-CU-KS18NKUA
Microprocessor
250V 25A
DC Twin Rotary (Hermetic)
C-6RVN93H0M / 1,050W
FV50S ... 0.74 (350)
R - S :
0.482
S - T :
0.482
T - R :
0.482
Yes
Yes
Yes
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
-
-
-
Fan
Type
Q'ty ... Dia. inch (mm)
Fan Motor
Type
Model ... Q'ty
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
Coil Resistance
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Over- Current Protection
Run Capacitor
Heat Exchanger Coil
Coil
Rows
Fins per inch
Face Area
W
Ohm
Micro F
VAC
2
ft
(m2)
Propeller
1 ... D16-17/32 (D420)
DC Motor
SIC-67FV-F460-1 ... 1
8
820
50
RED - WHT :
WHT - BLU :
BLU - RED :
77.5
77.5
77.5
Internal Controller
Yes
-
-
Aluminum Plate Fin / Copper Tube
2
21.2
5.49 (0.510)
External Finish Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
19
Outdoor Unit CU-KS24NKUA
Control PCB
Part No.
Controls
Control Circuit Fuse
Compressor
Type
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 77 °F (25 °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-KS24NKUA
Microprocessor
250V 25A
DC Twin Rotary (Hermetic)
G8T265FU1JW / 2,410W
FV50S ... 1.49 (700)
U - V :
0.36
V - W :
W - U :
0.36
0.36
Yes
Yes
Yes
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
-
-
230V 30W
Fan
Type
Q'ty ... Dia. inch (mm)
Fan Motor
Type
Model ... Q'ty
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
Coil Resistance
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Over-Current Protection
Over-Heat Protection
Run Capacitor
Heat Exchanger Coil
Coil
Rows
Fins per inch
Face Area
W
Ohm
Micro F
VAC
2
ft
(m2)
Propeller
1 ... D18-1/8 (D460)
DC Motor
SIC-71FW-D490-1 ... 1
8
850
90
-
Internal Controller
Yes
Yes
-
-
Aluminum Plate Fin / Copper Tube
2
18.1
6.40 (0.595)
External Finish Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
20
2-3. Other Component Specifications
Indoor Unit CS-KS18NKU
CS-KS24NKU
Outdoor Unit CU-KS18NKU CU-KS24NKU
CU-KS18NKUA CU-KS24NKUA
Indoor air temp sensor
(Model:PTM-D51H-S4-2 TH2)
Indoor heat exchanger sensor
(Model:PTM-D51H-S4-2 TH1)
Compressor temp sensor
(Model:TKS 293B)
10
9
8
7
6
5
Resistance (k ohm)
4
3
2
1
0
50
(10) (15) (20) (25) (30) (35) (40)
59 68 77 86 95 104
Temperature °F (°C)
200
180
160
140
120
100
Resistance (k ohm)
80
60
40
20
0
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
(Model:TKS295B)
Outdoor heat exchanger sensor
(Model:TKS292B)
40
35
30
25
20
Resistance (k ohm)
15
10
5
0
21
-
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-KS18NKU
CS-KS24NKU
CS-KS18NKU
CS-KS24NKU
22
Unit: inch(mm)
(852-0-0010-216-00-0)
Outdoor Unit CU-KS18NKU
CU-KS18NKUA
11-17/32
23-15/16 5-11/32
15/32
1-3/8
ID:23/32
34-21/32 (880)
2-ID:15/16
2-17/32
12-7/32
13-5/32
11-7/32 (285)
Wide tube service valve
dia.1/2" (12.70)
Narrow tube service valve
dia.1/4" (6.35)
23
23/32
1-13/16
2-13/32
26-3/8 (670)
3/32
5-23/32
Unit: inch(mm)
(852-0-0010-133-00-0)
2-5/32
4-3/8
6-17/32
Outdoor Unit CU-KS24NKU
CU-KS24NKUA
23-15/16 5-11/32
1-3/8
11-17/32
ID:23/32
35-7/16(900)
2-ID:15/16
15/32
2-15/16
13-19/32
12-19/32(320)
14-17/32
Narrow tube service valve
dia.1/4" (6.35)
Wide tube service valve
dia.5/8" (15.88)
24
23/32
1-21/32
2-7/8
29-1/8 (740)
5-29/32
4-7/16
2-1/32 4-1/2
Unit: inch(mm)
(852-0-0010-119-00-0)
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
Indoor Unit CS-KS18NKU
CS-KS24NKU
Indoor unit Outdoor unit
Heat exchanger
Wide tube
*1
Narrow tube
Outdoor Unit CU-KS18NKU CU-KS24NKU
CU-KS18NKUA CU-KS24NKUA
Wide tube
service
valve
Muffler
Narrow
tube
service
valve
Accumulator
High pressure
switch
H.P.
Electric
expansion
valve
M
Compressor
Heat exchanger
O.D.
1/4"
(6.35 mm)
*1 O.D.1/2"(12.7mm)
Insulation of Refrigerant Tubing
IMPORTANT
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and wet floors due to dripping of
condensation, both tubes must be well insulated with a
proper insulation material. The thickness of the insulation
should be a min. 5/16"(8 mm).
After a tube has been insulated,
CAUTION
never try to bend it into a narrow
curve because it can cause the tube
to break or crack.
O.D.5/8"(15.88mm)
Thickness:
Min. 5/16"(8 mm)
Wide tube
Cooling cycle
...
CS/CU-KS18NKUCU-KS18NKUA
...
CS/CU-KS24NKUCU-KS24NKUA
Insulation
Thickness:
Min. 5/16"(8 mm)
Narrow tube
25
5. PERFORMANCE DATA
5-1. Temperature Charts
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKU
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
159
(1.1)
145
psig(MPaG)
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
Low pressure at wide tube service valve
(0.5)
(2) Operating current performance chart
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
68
(20)
°
F (27
°
80
80°F (27°C)
°
F (24
°
75
75°F (24°C)
77
(25)
Outdoor inlet air DB temp. °F(°C)
8
7
Indoor Air Temp.86
Indoor Air Temp.86°
6
°
F (27
°
80°F (27°
80
°
F (24
°
75
75°F (24°C)
F (30
°
C)
C)
F (30°C)
F (30
°
C)
C)
C)
86
(30)
Hi FanLo fan
C)
°
95
(35)
Hi FanLo fan
C)
°
104
(40)
5
4
Operating current (A)
3
2
68
(20)
(3) Indoor discharge air performance chart
64.4 (18)
°C)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
Indoor discharge air temperature °F(
46.4 (8)
68
(20)
77
(25)
86
(30)
Outdoor inlet air DB temp. °F(°C)
Hi FanLo fan
C)
°
F (30
°
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
C)
°
F (27
°
80
80°F (27°C)
C)
C)
°
°
F (24
F (24
°
°
75
75
77
(25)
86
(30)
Outdoor inlet air DB temp. °F(°C)
95
(35)
95
(35)
104
(40)
104
(40)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
26
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKUA
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
159
(1.1)
145
psig(MPaG)
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
Low pressure at wide tube service valve
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
(2) Operating current performance chart
8
7
6
32
(0)
41
(5)
50
(10)
Outdoor inlet air DB temp. °F(°C)
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
59
(15)
68
(20)
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
80°F (27°C)
80
75°F (24°C)
75
80
80°
75°
75
°
°
F (27°C)
F (27
°
F (24°C)
F (24
°
F (27
F (24
C)
°
C)
°
77
(25)
C)
°
C)
°
F (30
°
F (30
°
Hi FanLo fan
C)
°
86
(30)
C)
°
95
(35)
Hi FanLo fan
104
(40)
5
4
Operating current (A)
3
2
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
(3) Indoor discharge air performance chart
64.4 (18)
°C)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
Indoor discharge air temperature °F(
46.4 (8)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
Outdoor inlet air DB temp. °F(°C)
32
(0)
41
(5)
50
(10)
Outdoor inlet air DB temp. °F(°C)
59
(15)
59
(15)
68
(20)
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
68
(20)
77
(25)
C)
°
F (27
°
80°F (27°C)
80
C)
°
F (24
°
75
75°F (24°C)
77
(25)
F (30
°
86
(30)
C)
°
86
(30)
95
(35)
Hi FanLo fan
95
(35)
104
(40)
104
(40)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
27
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKU
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
159
(1.1)
145
psig(MPaG)
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
Low pressure at wide tube service valve
(0.5)
(2) Operating current performance chart
Operating current (A)
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C
68
(20)
°
F (27
°
80°F (27°C)
80
°
F (24
°
75
75°F (24°C
77
(25)
Outdoor inlet air DB temp. °F(°C)
14
13
12
11
10
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
9
8
7
6
5
4
68
(20)
C)
°
F (27
C)
°
°
80
80°F (27°C)
F (24
°
75°F (24°C)
75
77
(25)
Outdoor inlet air DB temp. °F(°C)
°
C)
)
C)
F (30
°
F (30
(30)
°
(30)
Hi FanLo fan
)
C)
°
86
C)
86
95
(35)
Hi FanLo fan
95
(35)
104
(40)
104
(40)
(3) Indoor discharge air performance chart
68.0 (20)
°C)
64.4 (18)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
Indoor discharge air temperature °F(
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
46.4 (8)
42.8 (6)
68
(20)
F (27
°F (27°C)
°
80
80
F (24
°
75°F (24
75
77
(25)
°
°
°
C)
C)
C)
F (30
°
86
(30)
Hi FanLo fan
C)
°
95
(35)
104
(40)
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.
28
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKUA
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
159
(1.1)
145
psig(MPaG)
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
Low pressure at wide tube service valve
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
(2) Operating current performance chart
14
13
12
11
10
9
8
7
Operating current (A)
6
5
4
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
Outdoor inlet air DB temp. °F(°C)
32
(0)
41
(5)
50
(10)
Outdoor inlet air DB temp. °F(°C)
Indoor Air Temp.86
Indoor Air Temp.86°F (30
59
(15)
59
(15)
(20)
Indoor Air Temp.86
Indoor Air Temp.86°F (30°C)
(20)
F (27
°
80°F (27°C)
80
F (24
°
75°F (24
75
68
°
80
80°
°
°
75
75
68
F (27
F (27
F (24
F (24°C)
°
°C
°
C)
C)
°
°
C)
°
C)
C)
77
(25)
F (30
°
77
(25)
F (30
°
)
Hi FanLo fan
C)
°C)
°
86
(30)
C)
°
86
(30)
95
(35)
Hi FanLo fan
95
(35)
104
(40)
104
(40)
(3) Indoor discharge air performance chart
68.0 (20)
°C)
64.4 (18)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
Indoor discharge air temperature °F(
42.8 (6)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
Indoor Air Temp.86
Indoor Air Temp.86
F (27
°
80°F (27°C)
80
F (24
°F (24°C)
°
75
75
68
(20)
F (30
°F (30°C)
°
C)
°
C)
°
77
(25)
Hi FanLo fan
C)
°
86
(30)
95
(35)
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.
29
104
(40)
5-2. Cooling Capacity
Indoor Unit : CS-KS18NKU
Outdoor Unit : CU-KS18NKU / CU-KS18NKUA
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 524 CFM
INDOOR OUTDOOR
ENT. TEMP.
WB DB 65 75 85 95 105 115
59 76 (24.4) SHC 14,130 14,230 14,340 14,030 13,720 10,700
(15.0) 80 (26.7) SHC 15,960 16,060 16,060 15,860 15,320 10,700
63 76 (24.4) SHC 12,810 12,610 12,300 12,000 11,690 9,550
(17.2) 80 (26.7) SHC 14,640 14,340 14,130 13,830 13,520 10,940
67 76 (24.4) SHC 10,780 10,470 10,270 10,060 9,660 7,520
(19.4) 80 (26.7) SHC 12,500 12,300 12,100 11,790 11,490 9,350
71 76 (24.4) SHC 8,540 8,330 8,130 7,930 7,420 5,490
(21.7) 80 (26.7) SHC 10,270 10,060 9,860 9,660 9,150 7,210
75 76 (24.4) SHC 6,300 6,200 5,990 5,790 5,180 3,450
(23.9) 80 (26.7) SHC 8,130 7,930 7,720 7,620 7,010 5,280
o
F (oC) AMBIENT TEMP. oF (oC)
(18.3) (23.9) (29.4) (35.0) (40.6) (46.1)
TC 16,270 16,440 16,590 16,040 15,320 10,700
CI
72 (22.2) SHC 12,400 12,500 12,610 12,300 12,000 9,860
84 (28.9) SHC 16,270 16,440 16,590 16,040 15,320 10,700
88 (31.1) SHC 16,270 16,440 16,590 16,040 15,320 10,700
TC 18,460 17,920 17,330 16,770 16,040 10,940
CI
72 (22.2) SHC 11,080 10,880 10,570 10,370 9,960 7,830
84 (28.9) SHC 16,370 16,060 15,860 15,560 15,250 10,940
88 (31.1) SHC 18,100 17,790 17,330 16,770 16,040 10,940
TC 19,190 18,650 18,060 # 17,500 16,560 11,150
CI
72 (22.2) SHC 9,050 8,740 8,540 8,330 7,930 5,790
84 (28.9) SHC 14,230 14,030 13,830 13,520 13,110 11,080
88 (31.1) SHC 15,960 15,760 15,450 15,250 14,840 11,150
TC 19,880 19,350 18,760 18,220 16,840 11,330
CI
72 (22.2) SHC 6,810 6,600 6,400 6,200 5,690 3,760
84 (28.9) SHC 12,000 11,790 11,590 11,390 10,880 8,940
88 (31.1) SHC 13,720 13,520 13,320 13,110 12,610 10,670
TC 20,470 19,940 19,350 18,830 17,030 11,450
CI
84 (28.9) SHC 9,860 9,660 9,450 9,350 8,740 6,910
88 (31.1) SHC 11,590 11,390 11,180 10,980 10,470 8,640
0.87 1.04 1.21 1.36 1.54 1.24
0.88 1.06 1.23 1.39 1.57 1.24
0.89 1.08 1.26 1.42 1.59 1.24
0.91 1.10 1.29 1.45 1.59 1.24
0.93 1.13 1.32 1.48 1.59 1.24
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
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
2.
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.
30
Indoor Unit : CS-KS24NKU
Outdoor Unit : CU-KS24NKU / CU-KS24NKUA
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY: 24,200 BTU/h AIR FLOW RATE: 659 CFM
INDOOR OUTDOOR
ENT. TEMP.
WB DB 65 75 85 95 105 115
59 76 (24.4) SHC 17,730 17,860 17,990 17,990 16,330 11,020
(15.0) 80 (26.7) SHC 19,910 20,040 20,040 20,170 18,230 11,020
63 76 (24.4) SHC 16,970 16,580 16,200 15,810 13,770 10,690
(17.2) 80 (26.7) SHC 19,140 18,760 18,370 17,990 15,940 11,270
67 76 (24.4) SHC 14,410 14,020 13,640 13,380 11,210 8,390
(19.4) 80 (26.7) SHC 16,580 16,200 15,810 15,560 13,380 10,570
71 76 (24.4) SHC 11,590 11,330 10,950 10,690 8,520 5,830
(21.7) 80 (26.7) SHC 13,770 13,380 13,130 12,870 10,690 8,000
75 76 (24.4) SHC 8,900 8,640 8,260 8,130 5,960 3,520
(23.9) 80 (26.7) SHC 10,950 10,690 10,440 10,310 8,130 5,700
o
F (oC) AMBIENT TEMP. oF (oC)
(18.3) (23.9) (29.4) (35.0) (40.6) (46.1)
TC 21,050 21,240 21,410 21,470 18,230 11,020
CI
72 (22.2) SHC 15,690 15,810 15,810 15,940 14,280 10,950
84 (28.9) SHC 21,050 21,240 21,410 21,470 18,230 11,020
88 (31.1) SHC 21,050 21,240 21,410 21,470 18,230 11,020
TC 25,430 24,710 23,910 23,200 18,670 11,270
CI
72 (22.2) SHC 14,920 14,530 14,150 13,770 11,720 8,640
84 (28.9) SHC 21,190 20,810 20,420 20,170 17,990 11,270
88 (31.1) SHC 23,240 22,980 22,470 22,210 18,670 11,270
TC 26,410 25,690 24,890 # 24,200 19,060 11,490
CI
72 (22.2) SHC 12,230 11,970 11,590 11,330 9,160 6,340
84 (28.9) SHC 18,630 18,250 17,860 17,610 15,430 11,490
88 (31.1) SHC 20,680 20,290 20,040 19,650 17,480 11,490
TC 27,350 26,640 25,840 25,180 19,390 11,670
CI
72 (22.2) SHC 9,540 9,160 8,900 8,640 6,470 3,780
84 (28.9) SHC 15,810 15,560 15,170 14,920 12,740 10,180
88 (31.1) SHC 17,860 17,610 17,220 16,970 14,790 11,670
TC 28,120 27,420 26,630 26,020 19,600 11,790
CI
84 (28.9) SHC 13,130 12,870 12,490 12,360 10,180 7,750
88 (31.1) SHC 15,170 14,920 14,660 14,410 12,230 9,800
1.39 1.65 1.91 2.13 2.04 1.40
1.41 1.68 1.95 2.17 2.04 1.40
1.43 1.72 2.00 2.22 2.04 1.40
1.46 1.76 2.05 2.27 2.04 1.40
1.50 1.80 2.10 2.32 2.04 1.40
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
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
2.
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.
31
5-3. Cooling Capacity (Low Ambient)
Indoor Unit : CS-KS18NKU
Outdoor Unit : CU-KS18NKUA
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: 524 CFM
INDOOR OUTDOOR
ENT. TEMP.
WB DB 0 5 15 25 35 45 55
59 76 (24.4) SHC 13,520 13,520 13,520 15,140 13,620 13,620 13,620
(15.0) 80 (26.7) SHC 15,050 15,040 15,010 15,140 15,200 15,260 15,230
63 76 (24.4) SHC 11,280 11,280 11,280 15,350 11,490 11,490 11,590
(17.2) 80 (26.7) SHC 13,110 13,110 13,110 15,350 13,220 13,320 13,320
67 76 (24.4) SHC 8,940 8,940 9,050 15,460 9,250 9,350 9,450
(19.4) 80 (26.7) SHC 10,780 10,780 10,880 15,460 11,080 11,180 11,180
71 76 (24.4) SHC 6,500 6,600 6,600 15,440 7,010 7,110 7,210
(21.7) 80 (26.7) SHC 8,330 8,330 8,440 15,440 8,740 8,940 8,940
75 76 (24.4) SHC 4,260 4,260 4,370 15,300 4,770 4,880 4,980
(23.9) 80 (26.7) SHC 5,990 6,100 6,200 15,300 6,600 6,710 6,810
o
F (oC) AMBIENT TEMP. oF (oC)
(-17.8) (-15.0) (-9.4) (-3.9) (1.7) (7.2) (12.8)
TC 15,050 15,040 15,010 15,140 15,200 15,260 15,230
CI
72 (22.2) SHC 11,790 11,790 11,790 15,140 11,890 11,890 11,890
84 (28.9) SHC 15,050 15,040 15,010 15,140 15,200 15,260 15,230
88 (31.1) SHC 15,050 15,040 15,010 15,140 15,200 15,260 15,230
TC 15,050 15,050 15,090 15,350 15,480 15,620 15,640
CI
72 (22.2) SHC 9,550 9,550 9,550 15,350 9,760 9,860 9,860
84 (28.9) SHC 14,740 14,740 14,840 15,350 14,950 15,050 15,050
88 (31.1) SHC 15,050 15,050 15,090 15,350 15,480 15,620 15,640
TC 14,890 14,920 15,040 15,460 15,680 15,910 16,000
CI
72 (22.2) SHC 7,210 7,210 7,320 15,460 7,520 7,620 7,720
84 (28.9) SHC 12,500 12,500 12,500 15,460 12,810 12,910 12,910
88 (31.1) SHC 14,230 14,230 14,230 15,460 14,540 14,640 14,640
TC 14,550 14,610 14,820 15,440 15,780 16,120 16,290
CI
72 (22.2) SHC 4,880 4,880 4,880 15,440 5,280 5,380 5,490
84 (28.9) SHC 10,060 10,060 10,160 15,440 10,470 10,670 10,670
88 (31.1) SHC 11,790 11,790 11,890 15,440 12,200 12,300 12,400
TC 14,050 14,130 14,450 15,300 15,760 16,210 16,470
CI
84 (28.9) SHC 7,720 7,830 7,930 15,300 8,330 8,440 8,540
88 (31.1) SHC 9,450 9,450 9,550 15,300 10,060 10,160 10,270
0.71 0.74 0.76 0.63 0.61 0.58 0.61
0.81 0.84 0.85 0.69 0.65 0.61 0.62
0.93 0.96 0.95 0.76 0.70 0.64 0.64
1.07 1.09 1.07 0.84 0.76 0.68 0.67
1.21 1.23 1.19 0.93 0.83 0.73 0.70
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
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.
32
Indoor Unit : CS-KS24NKU
Outdoor Unit : CU-KS24NKUA
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY: 24,200 BTU/h AIR FLOW RATE: 659 CFM
INDOOR OUTDOOR
ENT. TEMP.
WB DB 0 5 15 25 35 45 55
59 76 (24.4) SHC 17,730 17,730 17,730 21,210 17,860 17,730 17,730
(15.0) 80 (26.7) SHC 19,910 19,910 19,910 21,210 19,910 19,910 19,910
63 76 (24.4) SHC 14,790 14,920 14,920 21,460 15,050 15,050 15,170
(17.2) 80 (26.7) SHC 16,970 16,970 16,970 21,460 17,220 17,220 17,350
67 76 (24.4) SHC 11,850 11,850 11,970 21,570 12,230 12,360 12,490
(19.4) 80 (26.7) SHC 14,020 14,020 14,150 21,570 14,410 14,530 14,660
71 76 (24.4) SHC 8,770 8,770 8,900 21,510 9,410 9,410 9,540
(21.7) 80 (26.7) SHC 10,820 10,950 11,080 21,510 11,460 11,590 11,720
75 76 (24.4) SHC 5,700 5,830 6,080 21,270 6,600 6,600 6,850
(23.9) 80 (26.7) SHC 7,880 8,000 8,130 21,270 8,770 8,770 9,030
o
F (oC) AMBIENT TEMP. oF (oC)
TC 21,090 21,110 20,980 21,210 21,150 21,090 21,140
CI
72 (22.2) SHC 15,690 15,690 15,690 20,420 15,690 15,690 15,690
84 (28.9) SHC 21,090 21,110 20,980 21,210 21,150 21,090 21,140
88 (31.1) SHC 21,090 21,110 20,980 21,210 21,150 21,090 21,140
TC 20,960 21,020 21,030 21,460 21,460 21,470 21,630
CI
72 (22.2) SHC 12,740 12,740 12,740 20,420 13,000 13,000 13,130
84 (28.9) SHC 19,010 19,140 19,140 21,460 19,270 19,270 19,400
88 (31.1) SHC 20,960 21,020 21,030 21,460 21,320 21,320 21,450
TC 20,600 20,700 20,890 21,570 21,640 21,750 22,020
CI
72 (22.2) SHC 9,800 9,800 9,930 20,420 10,180 10,310 10,310
84 (28.9) SHC 16,070 16,070 16,200 21,570 16,580 16,580 16,710
88 (31.1) SHC 18,120 18,250 18,250 21,570 18,630 18,630 18,760
TC 19,950 20,090 20,520 21,510 21,680 21,880 22,310
CI
72 (22.2) SHC 6,600 6,720 6,850 20,420 7,240 7,360 7,490
84 (28.9) SHC 13,000 13,000 13,130 21,510 13,640 13,640 13,890
88 (31.1) SHC 15,050 15,050 15,300 21,510 15,690 15,690 15,940
TC 19,060 19,240 19,940 21,270 21,540 21,860 22,440
CI
84 (28.9) SHC 9,930 10,050 10,310 21,270 10,820 10,950 11,080
88 (31.1) SHC 12,100 12,100 12,360 21,270 12,870 13,000 13,130
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
(-17.8) (-15.0) (-9.4) (-3.9) (1.7) (7.2) (12.8)
1.26 1.30 1.20 0.92 1.00 1.06 1.03
1.43 1.47 1.33 1.01 1.07 1.12 1.06
1.64 1.67 1.49 1.11 1.16 1.19 1.11
1.87 1.90 1.68 1.22 1.26 1.27 1.16
2.11 2.13 1.86 1.34 1.37 1.36 1.21
NOTE
1.
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.
33
5-4. Air Throw Distance Charts
0
5
10
15
0 5 10 15 20 25 30
Indoor Unit CS-KS18NKU
Cooling
Room air temp. : 80°F (26.7°C)
Fan speed : High
Axis air velocity (ft./sec.)
Vertical distance (ft.)
Horizontal distance (ft.)
: Flap angle 0 , : Axis air velocity 0
: Flap angle 30 , : Axis air velocity 30
34
Indoor Unit CS-KS24NKU
0
5
10
15
0 5 10 15 20 25 30
Cooling
Room air temp. : 80°F (26.7°C)
Fan speed : High
Axis air velocity (ft./sec.)
Vertical distance (ft.)
Horizontal distance (ft.)
: Flap angle 0 , : Axis air velocity 0
: Flap angle 30 , : Axis air velocity 30
35
6. ELECTRICAL DATA
6. ELECTRICAL DATA
6-1. Electrical Characteristics
6-1. Electrical Characteristics
Indoor Unit CS-KS18NKU
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKU
Outdoor Unit CU-KS18NKU
Cooling
Cooling
Indoor Unit Outdoor Unit
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Fan Motor Fan Motor + Compressor
Performance at 230V Single-phase 60Hz
Performance at 230V Single-phase 60Hz
Rating conditions Running amp. A 0.3
Rating conditions Running amp. A 0.3
Power input W
Power input W
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Rating conditions:
Rating conditions:
Cooling
Cooling
Performance at 208V Single-phase 60Hz
Performance at 208V Single-phase 60Hz
Rating conditions Running amp. 0.3
Rating conditions Running amp. 0.3
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Outdoor air temperature: 95 °F (35 °C) DB
Outdoor air temperature: 95 °F (35 °C) DB
A
A
Power input 32
Power input 32
W
W
32
32
Indoor Unit Outdoor Unit
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Fan Motor Fan Motor + Compressor
6.7
6.7
1,468
1,468
7.4
7.4
1,468
1,468
<
230V
<
230V
Complete Unit
Complete Unit
7.0
7.0
1,500
1,500
208V
208V
<
<
Complete Unit
Complete Unit
7.7
7.7
1,500
1,500
>
>
>
>
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Rating conditions:
Rating conditions:
Indoor Unit CS-KS18NKU
Indoor Unit CS-KS18NKU
Outdoor Unit CU-KS18NKUA
Outdoor Unit CU-KS18NKUA
Cooling
Cooling
Performance at 230V Single-phase 60Hz
Performance at 230V Single-phase 60Hz
Rating conditions Running amp. 0.3
Rating conditions Running amp. 0.3
Rating conditions:
Rating conditions:
Cooling
Cooling
Performance at 208V Single-phase 60Hz
Performance at 208V Single-phase 60Hz
Rating conditions Running amp. 0.3
Rating conditions Running amp. 0.3
Rating conditions:
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
Outdoor air temperature: 95 °F (35 °C) DB
Indoor Unit Outdoor Unit
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Fan Motor Fan Motor + Compressor
A
A
Power input 32
Power input 32
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Outdoor air temperature: 95 °F (35 °C) DB
Outdoor air temperature: 95 °F (35 °C) DB
Power input 32
Power input 32
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Indoor air temperature: 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
Outdoor air temperature: 95 °F (35 °C) DB
Outdoor air temperature: 95 °F (35 °C) DB
W
W
W
W
Indoor Unit Outdoor Unit
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Fan Motor Fan Motor + Compressor
A
A
6.7
6.7
1,468
1,468
7.4
7.4
1,468
1,468
230V
230V
<
<
Complete Unit
Complete Unit
7.0
7.0
1,500
1,500
208V
208V
<
<
Complete Unit
Complete Unit
7.7
7.7
1,500
1,500
>
>
>
>
36
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKU
Cooling
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Performance at 230V Single-phase 60Hz
Rating conditions Running amp. A 0.5
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
55
10.3
2,405
Cooling
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Performance at 208V Single-phase 60Hz
Rating conditions Running amp. 0.5
Power input 55
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
A
W
11.6
2,405
Indoor Unit CS-KS24NKU
Outdoor Unit CU-KS24NKUA
<
230V
Complete Unit
10.8
2,460
208V
<
Complete Unit
12.1
2,460
>
>
Cooling
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Performance at 230V Single-phase 60Hz
Rating conditions Running amp. 0.5
Power input 55
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
A
W
10.3
2,405
Cooling
Indoor Unit Outdoor Unit
Fan Motor Fan Motor + Compressor
Performance at 208V Single-phase 60Hz
Rating conditions Running amp. 0.5
Power input 55
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
A
W
11.6
2,405
230V
<
Complete Unit
10.8
2,460
208V
<
Complete Unit
12.1
2,460
>
>
37
6-2. Electric Wiring Diagrams
Indoor Unit CS-KS18NKU CS-KS24NKU
EVAPORATOR
CONNECTOR
1
2
FLAP
FLAP MOTOR
3
4
5
GRN/YEL
1
RED
2
PNK
3
BLU
4
BRN
5
YEL
WARNING
AC1
1
1
2
2
FLAP
33
5P (WHT)
4
4
5
5
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
TERMINAL BASE
AC2
LAMP
10P (WHT)
BLK
WHT
RED
SI
1
2
3
1
1
10
RED
2
WHT
3
WHT
WHT
5
WHT
WHT
7
WHT
WHT
WHT
WHT
2
3
454
676
8 8
9 9 99
10
1
2
3
454
676
8 8
10
TO OUTDOOR UNIT
1
2
3
5
7
10
IND LAMP ASSY
FM
FAN MOTOR
RED
BLK
WHT
YEL
BLU
CONTROLLER
1
1
5
6
22
33
DCM
6P (BLU)
44
5
6
ROOM/COIL
4P (WHT)
4P (WHT)
HA
JEM-A
1
1
2
2
3
3
4
4
4123
ROOM THERMISTOR
BLK
BLK
BLK
BLK
COIL THERMISTOR
8FA2-5251-11000-2
38
Outdoor Unit CU-KS18NKU CU-KS18NKUA
w
w
w
BLU
RED(PINK)RED(PINK)
WHT
1 2
3
2
1
3
CORE
FERRITE
3P-CONNECTOR (WHT)
BLU
WHT
S
RT
COMPRESSOR
CM
COMPRESSOR
MOTOR
ELEC SYSTEM ASSY
*
WARNING
REACTANCE
WHT WHT
1 2
2
1
(WHT)
WHT
2P-CONNECTOR
U
V
W
COMP A-TH
1 2
1 2
BLK
THERMISTOR
OVERLOAD RELAY
WHT
w
w
L1 L2 E1
CONTROLLER
1234
1 2 43
BLK
(OLR)
BLK
BLK
OUT DOOR
COIL/OUTDOOR
1234
1 2 43
YEL
YEL
THERMISTOR
COIL
THERMISTOR
DCFM MV0
2 3 4 5 6 7
1
BLK
WHT
1 2
3 4
1 2 4 5 6 73
BLK
WHT
7P-CONNECTOR (WHT)
FM
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
MV0
MAGNETIC COIL
1
2
2P-CONNECTOR (RED)
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
BLK
POWER RELAY
GRN
GRN
w
E2 E
25A
ACIN1
ACIN2
SI-A
5
YEL
BLK
RED
GRY
5
1
2
ww
w
w
w
GRN
WHT
WHT
BLK
WHT
RED
6
5
BLK
FERRITE CORE
BLK
WHT
WHT
BLK
121
2
BLK
2P-CONNECTOR (BLK)
1
4
TERMINAL
PLATE
1
2
3
GND
4
5
6
NL
POWER
SUPPLY
GND
HIGH PRESSURE
SWITCH
TO INDOOR UNIT
39
8FA2-5251-12000-2
Outdoor Unit CU-KS24NKU
w
w
w
BLU
RED(PINK)RED(PINK)
WHT
1 2
3
2
1
3
CORE
FERRITE
3P-CONNECTOR (WHT)
BLU
WHT
V
UW
COMPRESSOR
CM
COMPRESSOR
MOTOR
ELEC SYSTEM ASSY
*
REACTANCE
WHT WHT
1 2
2
1
(WHT)
WHT
w
L1 L2
1234
1 2 43
BLK
(OLR)
WHT
w
BLK
BLK
OUT DOOR
THERMISTOR
2P-CONNECTOR
U
V
W
COMP A-TH
1 2
1 2
BLK
THERMISTOR
OVERLOAD RELAY
CONTROLLER
COIL/OUTDOOR
1234
1 2 43
YEL
YEL
COIL
THERMISTOR
WARNING
DCFM MV0
1
2 3 4 5 6 7
BLU
RED
1 2
3 4
1 2 4 5 6 73
BLU
RED
7P-CONNECTOR (WHT)
FM
FAN MOTOR
WHT
WHT
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
GRN
w
E2 E
25A
1 2 3 4 5
1 2 43
BRN
WHT
ORG
RED
GRY
5 6 7
BRN
ORG
1 2123 4345
WHT
ORG
MV0
MAGNETIC COIL
1
1
2
2P-CONNECTOR (RED)
2
5
YEL
WHT
5
ACIN1
ACIN2
SI-A
w
w
w
w
GRN
WHT
WHT
BLK
WHT
RED
BLK
POWER RELAY
6
5
BLK
TERMINAL
FERRITE CORE
BLK
WHT
WHT
HIGH PRESSURE
BLK
121
2
BLK
2P-CONNECTOR (BLK)
1
4
PLATE
1
2
3
GND
4
5
6
SUPPLY
GND
SWITCH
TO INDOOR UNIT
NL
POWER
40
8FA2-5251-12800-2
Outdoor Unit CU-KS24NKUA
1P-CONNECTOR(WHT)
111
1P-CONNECTOR(WHT)
1
WHT
WHT
CRANKCASE
HEATER
RED(PINK)RED(PINK)
1 2123
3P-CONNECTOR (WHT)
V
UW
BLU
WHT
3
BLU
WHT
FERRITE
HEATER1 HEATER0
w
w
w
CORE
COMPRESSOR
CM
COMPRESSOR
MOTOR
ELEC SYSTEM ASSY
*
REACTANCE
WHT WHT
(WHT)
WHT
WHT
2P-CONNECTOR
w w
U
V
W
COMP A-TH
1 2
1 2
BLK
BLK
THERMISTOR
OVERLOAD RELAY
1234
1 2 43
BLK
BLK
(OLR)
w
L1 L2
OUT DOOR
1 2
2
1
WHT
WHT
w
CONTROLLER
COIL/OUTDOOR
1234
1 2 43
YEL
YEL
THERMISTOR
COIL
THERMISTOR
WARNING
DCFM MV0
2 3 4 5 6 7
1
BLU
RED
1 2
3 4
RED
FAN MOTOR
WHT
WHT
5 6 7
BLU
FM
1 2 4 5 6 73
7P-CONNECTOR (WHT)
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
GRN
w
E2 E
25A
1 2 3 4 5
1 2 43
BRN
WHT
ORG
1 2123 4345
BRN
WHT
ORG
MAGNETIC COIL
2P-CONNECTOR (RED)
RED
ORG
MV0
1
2
GRY
1
2
5
WHT
5
ACIN1
ACIN2
YEL
SI-A
w
w
w
w
GRN
WHT
WHT
BLK
WHT
RED
BLK
POWER RELAY
6
5
BLK
TERMINAL
FERRITE CORE
BLK
WHT
WHT
HIGH PRESSURE
121
BLK
2
BLK
2P-CONNECTOR (BLK)
1
4
PLATE
1
2
3
GND
4
5
6
SUPPLY
GND
SWITCH
TO INDOOR UNIT
NL
POWER
41
8FA2-5251-12700-2
7. MAINTENANCE
7-1. Address Setting of the Remote
Control Unit
The address can be set in order to prevent
interference between remote controllers when two
Sanyo 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 QUIET
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 QUIET 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
QUIET
button
Tab
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"signalreceived 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
42
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.
43
8. FUNCTIONS
8-1. Operation Functions
Emergency operation SENSOR DRY
Emergency operation is available when the remote
controller malfunctions, has been lost, or otherwise
cannot be used.
To operate the system, press the OPERATION button,
which is also used as the receiver, below the unit display.
Each time this button is pressed, the OPERATION lamp
changes color to indicate the type of operation. Select the
desired type of operation.
COOL STOP
(GREEN) (Lamp Off)
The set temperature is 4°F(2°C) below the detected room
temperature in the case of cooling operation.
During DRY operation, the system adjusts the room
temperature and fan speed according to the conditions in the
room, in order to maintain a comfortable room environment.
SENSOR DRY operation
DRY operation is as shown in the figure below.
Load
COOL zone
A zone
B zone
Conditions are monitored at all
times when the room temperature
is below 59°F(15°C).
DRY A
The compressor operation frequency varies.
The indoor fan operates with 1/f fluctuation.
DRY B
The compressor operates at a low operating frequency.
The indoor fan operates with 1/f fluctuation.
Monitor
Monitoring operation takes place when the room temperature
is below 59°F
temperature.
When the monitoring range is entered, the compressor stops,
and the indoor fan operates with 1/f fluctuation.
NOTE
The Sensor Dry operation during the Low Ambient Cooling
Mode (outside air temperature:59°F(15°C) or lower) is as
follows.
DRY A
The compressor operates a cycle of 3 minutes ON and 6
minutes OFF repeatedly.
(15°C), or more than 5°F(3°C) below the set
(CLxx models only)
DRY Band
PAM- control
In order to further improve inverter performance, control is
switched between PWM control at low operation speeds, and
PAM control at high operation speeds, making the most
effective use of power.
44
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
0
30 min. 5 min.
Start End
Time
NOTE
When HIGH POWER operation ends, the unit operates at low
Hz for 5 minutes, regardless of the thermostat OFF conditions.
When in DRY mode, operation is in the cooling zone.
When NIGHT SETBACK operation is set, the temperature and
fan speed settings will be adjusted automatically to allow
comfortable sleep.
When NIGHT SETBACK operation is set, " mark" appears on
the remote controller. The main unit display lamp also becomes
dimmer.
COOL and DRY modes
When the night setback mode is selected, the air conditioner
automatically raises the temperature setting 2°F(1°C) when 30
minutes have passed after the selection was made, and then
another 2°F(1°C) after another 30 minutes have passed,
regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing
comfort. This function is convenient when gentle cooling is
needed.
Setting
temperature
Press the NIGHT
SETBACK button
2°F(1°C)
2°F(1°C)
30 min. 30 min.
Time
Lamp colors
OPERATION lamp
DRY operation Orange
COOL operation Green
FAN operation Green
TIMER lamp Green
QUIET lamp Green
Timer backup
Operation stops if there are no operator controls for 25 hours or
longer after unit operation switched from OFF to ON by use of
ON timer operation.
45
8-2. Protective Functions
Freeze prevention
During COOL or DRY operation, freezing is detected and
operation is stopped when the temperature of the indoor heat
exchanger matches the conditions below.
1.
Freeze-prevention operation is engaged when the
temperature of the indoor heat exchanger is below 43°F(6°C).
2.
Restart after freeze-prevention operation occurs when the
temperature of the indoor heat exchanger reaches 46°F(8°C)
or above.
46
(8)
43
(6)
36
(2)
temperature °F(°C)
Indoor heat exchanger
a.
b.
*
Area: Automatic capacity control
When the temperature drops below Point A, the operation
A
abcd
frequency is reduced by a certain proportion.
c.
Area: Frequency increase is prohibited.
d.
When the temperature reaches Point C or above, freezing
prevention is ended and control is the same as in the
C
B
a
area.
Compressor discharge temperature control
This function controls the operation frequency to prevent the
compressor discharge temperature from rising more than a
specified temperature.
Compressor discharge temperature °F(°C)
Approx.
214
(101)
Approx.
201
(94)
a.
Area: Automatic capacity control.
b.
When the temperature rises above Point A, the operation
A
B
abc d
frequency is reduced at a specified rate.
c.
Area: Further frequency increase is prohibited.
d.
When the temperature falls below Point B, prevention of a rise
in frequency is released and the air conditioner operates as in
a
area.
* The compressor will stop if the temperature of the compressor
discharge exceeds 248°F(120°C) due to shortage of gas or
other reason.
* When the temperature drops to below 36°F(2°C)
(continuously for 2 minutes or longer), the compressor stops.
Once the freeze condition is detected, the air conditioner will
work less than the maximum frequency until it is turned off.
NOTE
The Freeze Prevention Control during the Low Ambient Cooling
Mode (outside air temperature:59
The compressor stops when the temperature of indoor heat
exchanger becomes less than 36°F(2°C).
The compressor restarts when the temperature of indoor heat
exchanger becomes 46°F(8°C) or higher.
(CLxx models only)
°F(15°C)
or lower) is as follows.
CT (Peak current cut-off control)
This function prevents the circuit breaker or fuse from operating
to open the circuit. This function works when electrical current
has increased due to an increase in the cooling load,
or to a decrease in the power supply voltage. In these cases,
operation frequency is reduced or operation is interrupted automatically to control the electrical current for operation.
When the cause of the increase in electrical current is rectified,
the system will resume operation in the original mode.
< CS-KS18NKU >
Cooling Dry
Peak current cut-off trips 17.5
Hz down 11.0
< CS-KS24NKU >
Cooling Dry
Peak current cut-off trips 22.5
Hz down 14.0
(A)
(A)
46
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 QUIET 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 QUIET 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.
QUIET
button
< Clock display >
Test run mode
Self-diagnostics mode
ON/OFF
operation
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.
47
ACL
(Reset)
button
(1) Self-diagnostics Lamps
INDOOR UNIT
(1) OPERATION lamp
(2) TIMER lamp
(3) QUIET lamp
OPERATION button
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
QUIET TIMER
(3) (2) (1)
OPERATION
CODE DIAGNOSIS CONTENTS POSSIBLE MALFUNCTION
S01
S02
S03
S04
S05
S06
S07
E01
E02
E03
E04
E05
E06
E07
E08
E09
E10
E11
E12
E13
....
ROOM TEMP. SENSOR TROUBLE
I/D HEAT EXCHANGER
TEMP. SENSOR TROUBLE
HUMIDITY SENSOR TROUBLE
COMPRESSOR TEMP. SENSOR
TROUBLE
O/D HEAT EXCHANGER
TEMP. SENSOR TROUBLE
O/D AIR TEMP. SENSOR TROUBLE
O/D CURRENT SENSOR ERROR
I/D-O/D COMMUNICATION TROUBLE
(SERIAL COMMUNICATION TROUBLE)
HIC CIRCUIT TROUBLE
POWER TR CIRCUIT TROUBLE
O/D UNIT EXTERNAL ROM TROUBLE
CURRENT PEAK CUT
PAM CIRCUIT TROUBLE
ACTIVE CIRCUIT TROUBLE
COMPRESSOR DISCHARGE TEMP.
OVERHEATING PREVENTION
I/D FAN OPERATION TROUBLE
4-WAY VALVE SWITCHING TROUBLE
ZERO-CROSS TROUBLE
GAS-LOSS PREVENTION
DC COMPRESSOR DRIVE
CIRCUIT TROUBLE
O/D DC FAN OPERATION TROUBLE
O/D SYSTEM COMM FAILURE,
OLR OPERATION, O/D POWER
OPEN PHASE, O/D FREEZING
FREEZING-PREVENTION OPERATION
....
OFF
(1) OPEN OR SHORT CIRCUIT IN SENSOR
(2) POOR CONTACT AT CONNECTOR OR OPEN CIRCUIT AT
TERMINAL PRESS-FIT LOCATION (FOR HUMIDITY SENSOR,
THIS REPRESENTS SHORT-CIRCUIT DETECTION ONLY.)
(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 FAILURE (2) INSUFFICIENT GAS
(3) OPERATION AT LOW TEMPERATURE
BLINKING
....
ON
8FA2-5251-11100-2
48
(2) If the self-diagnostics function fails to operate
Check the indoor unit.
Is the fuse blown?
Normal
Replace the controller.
No indicators illuminate and the
indoor fan does not rotate.
Check the power voltage.
Blown
Replace the circuit
board or the fuse.
49
9-3. Checking the Indoor and Outdoor Units
(1) Checking the indoor unit
ControlNo. Check items (unit operation)
•
Use the remote controller to operate the
1
unit in "TEST run" mode. To determine
whether the mode is currently in
"TEST run" mode, check the 4 indicator
lamps on the unit. If all 4 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".
(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 and fan motor 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
The rated voltage must be present between inter-unit wirings 1 and 2.
•
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.
•
•
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
50
(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
E01
Quiet
Timer Operation :Off
(3) (2) (1)
: Blinking
: Illuminated
E12
< Before the Operation >
For terminal strip short circuit work or inter-unit wiring removal, turn off the power to
WARNING
avoid an electric shock.
Release the terminal strip short circuit after the completion of self-diagnostics.
Do not perform the short-circuit work between any other terminals except for
CAUTION
specified ones on the specified terminal strip. If such work is performed between
the incorrect terminals, the unit might be broken.
< Convenient Tool for Short-Circuit Work ( for example ) >
Alligator Clip
Cable
Alligator Clip
< Check Items before Troubleshooting Serial Communication Start >
After confirming that the following errors do not exist, start the "Troubleshooting Serial Communication"
in "Condition: E01 and E12".
1. Mis -wiring (inter-unit cable, etc.)
2. AC power failure
3. Blown fuse
4. Power Relay failure
5. Outdoor Fan Motor failure (defective insulation, etc.)
(3-1) Condition: E01
Troubleshooting Serial Communication
Is the voltage of about DC12V
or more given between the terminals
2 and 3 on the outdoor unit terminal strip
(Serial Communication Line) ?
(Fig. 1)
Yes
6. Reactor failure (defective insulation, etc.)
7. High-Pressure Switch failure
8. Overload Relay failure
9. Magnetic Coil failure (defective insulation, short-circuit, etc.)
10. Compressor failure (defective insulation, etc.)
+-
V
Outdoor Unit
1 2 43 5 6
Power
1 2 3
Indoor Unit
Fig. 1
1. Turn OFF the power and wait until the power lamp (LED)
No
of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the indoor unit
terminal strip. (Fig. 2)
3. Turn ON the power.
1 2 43 5 6
1 2 3
Indoor Unit
-
Outdoor Unit
Power
V
+
Fig. 2
( Continued to the next page A. )
A
( Continued to the next page B. )
B
51
( Continued from the previous page A. )
A
( Continued from the previous page B. )
B
Defect or connection error
in the inter-unit cable
1. Turn OFF the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Short-circuit between the terminals 2 and 3 on the outdoor
unit terminal strip. (Fig. 3)
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
What is the latest self-diagnosis result ?
Yes
Condition: E12
Is the voltage of about DC22V to
24V given between the terminals
2 and 3 on the indoor unit terminal strip
(Serial Communication Line) ?
(Fig. 2)
No
Defect in the indoor unit
P.C. board
Outdoor Unit
1 2 43 5 6
Power
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
Power
Fig. 4
Defect or connection error
in the inter-unit cable
Outdoor Unit
1 2 43 5 6
Power
1 2 3
Indoor Unit
Fig. 5
Defect in the indoor unit
P.C. board
52
(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
Power
1 2 3
Indoor Unit
Fig. 6
Condition: E01
Defect in the outdoor unit
P.C. board
Outdoor Unit
1 2 43 5 6
Power
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
53
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
(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
(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 .)
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Gnd (black)
Pin 4: Vcc (white)
Pin 5: Vs (yellow)
Pin 6: PG (blue)
DC 230 V or more
DC 14 V or more
Fluctuation between DC 1.7 to 6.1 V
Normal value
[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.
54
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
(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
or
Vm-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 230V or more
DC 14V or more
After fluctuating 4 times between DC 1.7 to 6.1V
(1 sec. ON) and DC 0 V (1 sec. OFF), the DC
motor trips.
(Replace the controller .)
Normal value
CU-KS18NKU / CU-KS18NKUA CU-KS24NKU / CU-KS24NKUA
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)
[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.
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Not used
Pin 4: Gnd (blue)
Pin 5: Vcc (brown)
Pin 6: PG (white)
Pin 7: Vsp (orange)
55
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 highsensitivity 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
56
10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation
Ground wire
Resistance
The insulation is in good condition if the resistance
exceeds 1M ohm.
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.
Probe
Copper
tube or
metallic part
Clip
Insulation
tester
Fig. 1
Terminal plate
Probe
Clip
Insulation
tester
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)
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
Fig. 2
Probe
Clip
Insulation
tester
Fig. 3
From fan motor,
compressor and
other parts
Probe
57
Clip
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
58
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.
59
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)
D
Flare tool for R410A
A
Conventional flare tool (R22)
D
0.0472"
(1.2 mm)
Spacer
A
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.
60
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"
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
R22, R407C : 1/4"
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.
61
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
(1) Recover refrigerant
(2) Replace compressor
OK
OK
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
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
More than 33 ft. (10 m)
More than 15 minutes
(3) Check for sealing
(4) Evacuation
(5) Recharge
OK
OK
62
(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%.
63
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
OK
OK
OK
(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
More than 33 ft. (10 m)
More than 15 minutes
(4) Check for sealing
(5) Evacuation
(6) Recharge
OK
OK
Recharge unit in the same manner explained on the
previous page "(5) Recharging."
64
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.
65
APPENDIX A
CS-KS18NKU + CU-KS18NKU
CS-KS24NKU + CU-KS24NKU
Operating Instructions
+ CU-KS18NKUA
+ CU-KS24NKUA
(852-6-4181-210-00-1)
A-1
Operating Instructions
Split System Air Conditioner
Model No.
Indoor Units
Outdoor Units
CS-KS18NKU
CS-KS24NKU
CU-KS18NKU
CU-KS18NKUA
CU-KS24NKU
CU-KS24NKUA
This air conditioner uses the refrigerant R410A.
Before operating the unit, read these operating instructions thoroughly and keep them for future reference.
Panasonic Corporation
1006 Kadoma, Kadoma City, Osaka, Japan
85264181210001
CV6233187228
FEATURES
CAUTION
This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these functions
are provided below; refer to these descriptions when using the air conditioner.
• Microprocessor Controlled Operation
The interior compartment of the remote controller
contains several features to facilitate automatic operation,
easy logically displayed for easy use.
• Simple One-touch Remote Controller
The remote controller has several features to facilitate
automatic operation.
• 24-Hour ON or OFF Timer
This timer can be set to automatically turn the unit on or
off at any time within a 24 hour period.
• 1-Hour OFF Timer
This timer can be set to automatically turn off the unit at
any time after one hour.
• Night Setback
This function saves energy by controlling operation to
provide a quieter operating sound than normal.
• Automatic and 3-step Fan Speed
Auto/High/Medium/Low
CONTENTS
Page Page
FEATURES............................................................................. 2
PRODUCT INFORMATION .................................................... 2
SAFETY PRECAUTIONS....................................................... 2
INSTALLATION LOCATION.................................................... 3
ELECTRICAL REQUIREMENTS ........................................... 3
SAFETY INSTRUCTIONS...................................................... 3
NAMES OF PARTS ................................................................ 5
USING THE REMOTE CONTROLLER................................ 10
OPERATION WITH THE REMOTE CONTROLLER ............ 12
1. Operation .............................................................. 12
2. Adjusting the Fan Speed....................................... 13
3. Fan Only................................................................ 13
4. Night Setback Mode.............................................. 14
5. QUIET Mode .........................................................15
6. HIGH POWER Mode............................................. 15
• Air Sweep Control
This function moves a flap up and down in the air outlet,
directing air in a sweeping motion around the room and
providing comfort in every corner.
• Auto. Flap Control
This automatically sets the flap to the optimum position
during heating, cooling, and drying operation.
• Automatic Restart Function for Power Failure
Even when power failure occurs, preset programmed
operation can be reactivated once power resumes.
• High Power Operation
The unit operates at maximum output for 30 minutes,
regardless of the desired temperature.
The fan speed is 1 step above “High”.
• Quiet Operation
The fan rotates slower than the fan speed setting to
provide a quieter operating sound.
SPECIAL REMARKS ........................................................... 16
SETTING THE TIMER ......................................................... 17
USING THE 1-HOUR OFF TIMER....................................... 19
TIPS FOR ENERGY SAVING.............................................. 19
ADJUSTING THE AIRFLOW DIRECTION........................... 20
OPERATION WITHOUT THE REMOTE CONTROLLER..... 21
CARE AND CLEANING ....................................................... 21
WIRED REMOTE CONTROLLER........................................ 23
TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) .... 24
OPERATING RANGE........................................................... 24
SPECIFICATIONS................................................................ 25
PRODUCT INFORMATION
If you have problems or questions concerning your Air
Conditioner, you will need the following information.
Model and serial numbers are on the nameplate on the
bottom of the cabinet.
Model No. __________________________________
Serial No. ___________________________________
Date of purchase _____________________________
Dealer’s address _____________________________
Phone number _______________________________
2
SAFETY PRECAUTIONS
The following symbols used in this manual, alert you
to potentially dangerous conditions to users, service
personnel or the appliance:
This symbol refers to a hazard or
unsafe practice which can result in
severe personal injury or death.
This symbol refers to a hazard or
unsafe practice which can result in
personal injury or product or property
damage.
INSTALLATION LOCATION
NOTE
• We recommend that this air conditioner be installed properly by qualified
installation technicians in accordance with the Installation Instructions
provided with the unit.
• Before installation, check that the voltage of the electric supply in your home or
office is the same as the voltage shown on the nameplate.
• Do not install this air conditioner where there are fumes or flammable
gases, or in an extremely humid space such as a greenhouse.
• Do not install the air conditioner where excessively high heatgenerating objects are placed.
Avoid: To protect the air conditioner from heavy corrosion, avoid installing the outdoor
unit where salty sea water can splash directly onto it or in sulphurous air near a
spa.
ELECTRICAL REQUIREMENTS
1. All wiring must conform to the local electrical codes. Consult your dealer or a
qualified electrician for details.
2. Each unit must be properly grounded with a ground (or earth) wire or through
the supply wiring.
3. Wiring must be done by a qualified electrician.
Pull off the power plug from a receptacle, or switch off the breaker, or switch off
the power disconnecting mean to isolate the air conditioner from the main power
supply when not in use for a long time.
SAFETY INSTRUCTIONS
• Read this Instruction Manual carefully before using this air conditioner. If
you still have any difficulties or problems, consult your dealer for help.
• This air conditioner is designed to give you comfortable room conditions.
Use this only for its intended purpose as described in this Instruction
Manual.
• Confirm to authorized dealer or specialist on usage of specified
refrigerant type.
Using of refrigerant other than the specified type may cause product
damage, burst and injury etc.
• Never touch the unit with wet hands.
• Never use or store gasoline or other flammable vapor or liquid near the
air conditioner — it is very dangerous.
• Do not use this appliance in a potentially explosive atmosphere.
• This air conditioner has no ventilator for intaking fresh air from
outdoors. You must open doors or windows frequently when you use
gas or oil heating appliances in the same room, which consume a lot of
oxygen from the air. Otherwise there is a risk of suffocation in an
extreme case.
• Do not swallow the battery.
• After removing the battery from remote controller, keep it away from the
reach of children. The battery can cause death by suffocation if
swallowed.
• When inserting the battery, make sure the polarities (+ and -) are correct.
3
• To prevent possible hazards from insulation failure, the unit must
CAUTION
NOTICE
be grounded.
• Do not clean inside the indoor and outdoor units by users. Engage
authorized dealer or specialist for cleaning.
• In case of malfunction of this appliance, do not repair by yourself.
Contact to the sales dealer or service dealer for a repair.
• Refrigerant gas leakage may cause fire.
• For safety, be sure to turn the air conditioner off and also to
disconnect the power before cleaning.
• Pull off the power plug from a receptacle, or switch off the breaker, or
switch off the power disconnecting mean to isolate the air conditioner
from the main power supply in case of emergency.
• Do not turn the air conditioner on and off from the power mains switch.
Use the ON/OFF operation button.
• Do not stick anything into the air outlet of the outdoor unit.
This is dangerous because the fan is rotating at high speed.
• Do not touch the air inlet or the sharp aluminum
fins of the outdoor unit. You may get injured.
• Keep the fire alarm and the air outlet at least 1.5m away from the unit.
• Do not let children play with the air conditioner.
• Do not cool or heat the room too much if babies or invalids are present.
• Do not sit or step on the unit.
You may fall down accidentally.
• Do not stick any object
into the FAN CASE.
You may be injured and
the unit may be damaged.
• This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause
undesired operation.
• This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
• FCC Caution: To assure continued compliance, follow the attached installation
instructions. Any changes or modifications not expressly approved by the
party responsible for compliance could void the user's authority to operate this
equipment.
4
NAMES OF PARTS
INDOOR UNIT
Air Intakes
Remote Controller
Air Outlet
Refrigerant Tubes
Drain Hose
OUTDOOR UNIT
Air Outlet
NOTE
This illustration is based on the external view of a standard model.
Consequently, the shape may differ from that of the air conditioner which you
have selected.
This air conditioner consists of an indoor unit and an outdoor unit. You can control
the air conditioner with the remote controller.
Air Intake Air from the room is drawn into this section and passes through air filters which
remove dust.
Air Outlet Conditioned air is blown out of the air conditioner through the air outlet.
Remote Controller The remote controller controls power ON/OFF, operation mode selection,
temperature, fan speed, timer setting, and air sweeping.
Refrigerant Tubes The indoor and outdoor units are connected by copper tubes through which
Drain Hose Moisture in the room condenses and drains off through this hose.
Outdoor (Condensing) Unit The outdoor unit contains the compressor, fan motor, heat exchanger coil, and
refrigerant gas flows.
other electrical components.
5
UNIT DISPLAY AND OPERATION BUTTON
REMOTE CONTROL receiver
Avoid using radio equipment
such as mobile phone near
(within 4 ft (1.2m).) the remote
control receiver. Some radio
equipment may cause
malfunction of the unit.
If the trouble happens,
disconnect power and restart
the air conditioner after a few
minutes.
IMPORTANT
OPERATION lamp
TIMER lamp
QUIET lamp
OPERATION button
INDOOR UNIT
NOTE
QUIET
REMOTE CONTROL receiver This section picks up infrared signals from the remote controller (transmitter).
OPERATION button When the remote controller cannot be used, pressing this button enables cooling
OPERATION lamp This lamp lights when the system is in the continuous DRY (orange), COOL
operation.
Each time this button is pressed, the operation mode changes cyclically.
Cooling operation Stop
(green) and FAN (green) mode.
TIMER lamp This lamp lights when the system is being controlled by the timer.
QUIET lamp This lamp lights during operation in the QUIET mode.
The unit’s display lamps are dimmed during operation in the NIGHT SETBACK
mode.
6
REMOTE CONTROLLER (DISPLAY)
Displayed when setting timer
Displayed when transmitting data
Displayed when indoor unit sensor
is in use
Displayed when setting
temperature
Displayed when temperature is
shown
Displayed when the
time display is set to
12-hour time.
Symbols
(1) Operation mode
MILD DRY ..............................
COOL .....................................
FAN ........................................
(2) Fan speed
Automatic operation ...............
HIGH .....................................
MEDIUM.................................
LOW .......................................
(3) Temperature setting
60–86°F
When set to 80 °F
temperature indication............
(4) Timer
24-hour clock with ON/OFF
program Timer........................
ON Timer................................
OFF Timer..............................
1-hour OFF Timer...................
(5) NIGHT SETBACK ..................
(6) Confirmation of
transmission ...........................
(7) Auto. fla.dication.....................
Flap angle indication ..............
Sweep indication ....................
(8) High power operation .............
(9) Quiet operation.......................
7
REMOTE CONTROLLER
NOTE
Transmitter
QUIET button
FAN SPEED selector button
FLAP button
ON TIME
setting
buttons
Advance button
Return button
CANCEL button
SENSOR button
Display
Sensor
(Cover closed)
ON/OFF operation button
1 HR. TIMER button
Temperature setting buttons (TEMP.)
MODE selector button
NIGHT SETBACK button
HIGH POWER button
Advance button
Return button
CLOCK button
Time display selector button
OFF TIME
setting
buttons
ADDRESS switch
Temperature display
selector button
The illustration above pictures the remote controller after the cover has been
opened.
Transmitter When you press the buttons on the remote controller, the mark appears in the
display to transmit the setting changes to the receiver in the air conditioner.
Sensor A temperature sensor inside the remote controller senses the room temperature.
Display Information on the operating conditions is displayed while the remote controller is
switched on. If the unit is turned off, FLAP setting and FAN SPEED setting are
not displayed.
QUIET button : When you press this button, the fan rotates slower than the fan speed
setting to provide a quieter operating sound.
ON/OFF operation button This button is for turning the air conditioner on and off.
1 HR. TIMER button
(1-HOUR OFF TIMER)
: When you press this button, regardless of whether the unit is operating or
stopping, the unit operates for one hour and then shuts down.
ACL button
8
REMOTE CONTROLLER (CONTINUED)
NOTE
NOTE
NOTE
Temperature setting buttons
(TEMP.)
MODE selector button Use this button to select DRY, COOL or FAN mode.
(DRY) : The air conditioner reduces the humidity in the room.
(COOL) : The air conditioner makes the room cooler.
(FAN) : The air conditioner works only as a circulation fan.
FAN SPEED selector button : The air conditioner automatically decides the fan speeds.
NIGHT SETBACK button For details, see “4. Night Setback Mode”. When you press this button in the DRY
FLAP button Press this button either to select the setting of the airflow direction to the auto.
Press the button to increase the set temperature.
Press the button to reduce the set temperature.
The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.
buttons is pressed.
: High fan speed
: Medium fan speed
: Low fan speed
or COOL mode, the mark appears in the display, and the remote controller will
automatically adjust the set temperature to save energy.
flap in each mode or one of the six possible positions manually or to select the
sweep function which moves the flap up and down automatically.
: Auto flap setting: If selected in a cooling or dry operation, the flap is set at
position (7) in the following chart.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.
When you press the FLAP button, the air flow direction will be changed one by
one as follows.
SWEEP
HIGH POWER button : If this button is pressed during DRY, COOL or FAN operation, the unit
operates at maximum output for 30 minutes, regardless of the desired
temperature.
The fan speed is 1 step above “High”.
ON TIME/OFF TIME setting
buttons
SENSOR button When you press this button (use a small-tipped object such as a ballpoint pen),
No display: The timer does not operate.
: The air conditioner starts at the set time.
: The air conditioner stops at the set time.
: The air conditioner stops and starts, or starts and stops, at the
set times every day. For details, see “SETTING THE TIMER”.
the mark will appear at the display. And the room temperature is detected by
the sensor which is built into the indoor unit and the air conditioner is controlled
accordingly.
If the remote controller is located near a heat source, such as a space heater or in direct
sunlight, press the SENSOR button to switch to the sensor on the indoor unit.
The indoor fan runs continuously when the system is in normal operation. It does not turn off when the
desired room temperature is reached. If Night Set Back mode is selected, the fan will turn off
intermittently during cooling operation in order to control air flow.
9
REMOTE CONTROLLER (CONTINUED)
NOTE
1. Slide the cover in the direction indicated by the arrow
and remove it.
2. Install two AAA alkaline batteries. Make sure the
batteries point in the direction marked in the battery
compartment.
3. Use a thin object such as the tip of a pen to press the
ACL button.
ACL button
CAUTION
Temperature Display Selector button
Time Display Selector button This switches the time display between 24-hour time and 12-hour time.
ACL button (ALL CLEAR) Puts the remote controller into pre-operation status. Always press this button
ADDRESS switch • The address switch changes to prevent mixing of signals from remote
The remote controller sends the temperature signal to the air conditioner regularly at five minute intervals.
If the signal from the remote controller stops for more than 15 minutes due to the loss of the remote
controller or other trouble, the air conditioner will switch to the temperature sensor which is built into the
indoor unit and control the room temperature. In these cases, the temperature around the remote
controller may differ from the temperature detected at the air conditioner’s position.
This switches the temperature display between °C and °F.
after replacing the batteries.
controller’s when two air conditioners are installed next to each other.
Normally, the address switch is set to A. For more information, please contact
the dealer where you made the purchase.
• Normally, the tabs on the remote controller should not be bent.
USING THE REMOTE CONTROLLER
How to Install Batteries
10
• The batteries last about six months, depending on how much you use
the remote controller. Replace the batteries when the remote controller’s
display fails to light, or when the remote controller cannot be used to
change the air conditioner’s settings.
• Use two fresh leak-proof type-AAA alkaline batteries.
• In replacing batteries, follow the instructions as mentioned in the
subsection “How to Install Batteries”.
• If you do not use the remote controller more than 1 month, take out the
batteries.
• Dispose of the used batteries at the designated location in compliance
with the applicable local ordinances.
Information for Users on Collection and Disposal of Old Equipment and used Batteries
[Information on Disposal in other
Countries outside the European Union]
These symbols are only valid in the
European Union. If you wish to discard these
items, please contact your local authorities
or dealer and ask for the correct method of
disposal.
Pb
Note for the battery symbol (bottom two
symbol examples):
This symbol might be used in combination
with a chemical symbol. In this case it
complies with the requirement set by the
Directive for the chemical involved.
USING THE REMOTE CONTROLLER (CONTINUED)
Air Conditioner
(Indoor unit)
Receiver
Remote Controller
(Transmitter head)
Remote Control
Holder
Mounting Screws
5/32 x 5/8" (4 x 16 mm)
(included)
Rear Side
Hole
• To prevent loss of the remote controller, you
can connect the remote controller to the
holder by passing a string through the
remote controller and attachment hole.
Press
Set in
place
How to Use the Remote
Controller
Remote Controller Installation
Position
When using the remote controller, always point the unit’s transmitter head directly
at the air conditioner’s receiver.
The remote controller may be operated either from a non-fixed position or from a
wall-mounted position. To ensure that the air conditioner operates correctly, do
not install the remote controller in the following places:
• In direct sunlight
• Behind a curtain or other places where it is covered
• More than 26 ft (8 m) away from the air conditioner
• In the path of the air conditioner’s airstream
• Where it may become extremely hot or cold
• Where it may be subject to electrical or magnetic noise
• Where there is an obstacle between the remote controller and air conditioner
(since a check signal is sent from the remote controller every 5 minutes)
Mounting the Remote
When Holding the Remote
Controller
Controller
Before mounting the remote controller, press the ON/OFF operation button at the
mounting location to make sure that the air conditioner operates from that
location. The indoor unit should make a beeping sound to indicate that it has
received the signal.
To take out the remote controller, pull it forward.
• When using the remote controller and during air conditioner operation, the
transmitter on the remote controller should be pointed towards the receiver on
the indoor unit.
• Make sure that there are no objects between the remote controller and
receiver which could block the signal.
11
1. Operation
NOTE
OPERATION WITH THE REMOTE CONTROLLER
STEP 2
STEP 3
STEP 1
STEP 4
STEP 5
Check that the circuit breaker on the power panel is turned on.
Press the setting buttons as described below and change the settings as desired.
STEP 1 Press the MODE selector button and select the desired mode.
For dehumidifying operation o
For cooling operation o
For fan only operation o
STEP 2 To start the air conditioner, press the ON/OFF operation button.
STEP 3 Press the TEMP. setting buttons to change the temperature
setting to the desired temperature.
Adjustable temperature range:
30 °C max.
16 °C min.
STEP 4 Set the FAN SPEED selector button to the setting you want.
STEP 5 Press the FLAP button and set the airflow direction as desired.
(Refer to “ADJUSTING THE AIRFLOW DIRECTION” on
page 20.)
or 86 °F max.
60 °F min.
To stop the air conditioner, press the ON/OFF operation button again.
12
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
NOTE
• Choose the best position in the room for the remote controller, which also acts
as the sensor for room comfort and transmits the operating instructions. Once
you’ve found this best position, always keep the remote controller there.
• This appliance has a built-in 5-minute time delay circuit to ensure reliable
operation. When the operation button is pressed, the compressor will start
running within three minutes. In the event of power failure, the unit will stop.
2. Adjusting the Fan Speed
A. Automatic fan speed Simply set the FAN SPEED selector button to the position.
This automatically sets the best fan speed for the room temperature.
B. Manual fan speed If you want to adjust fan speed manually during operation, just set the FAN
SPEED selector button as desired. [ , , or ]
3. Fan Only
STEP 2
STEP 1
STEP 3
If you want to circulate air without any temperature control, follow these steps:
STEP 1 Press the MODE selector button to switch to the fan mode .
STEP 2 Press the ON/OFF operation button.
STEP 3 Press the FAN SPEED selector button to select the fan speed of
your choice ( , or ).
13
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
NOTE
When the night setback mode is selected, the air conditioner automatically
raises the temperature setting 2 °F when 30 minutes have passed after the
selection was made, and then another 2 °F after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle cooling is needed.
Setting
temperature
Press the NIGHT
SETBACK button
30 min.
30 min.
Time
2°F
2°F
4. Night Setback Mode
In Cooling and DRY
Mode: ( and )
Night Setback Mode is used for saving energy.
Press the NIGHT SETBACK button while unit is operating. (except FAN mode)
The mark appears in the display.
To release the night setback function, press the NIGHT SETBACK button again.
Pressing the MODE selector button cancels Night Setback mode.
14
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
NOTE
5. QUIET Mode
6. HIGH POWER Mode
QUIET Mode is used to reduce the fan sound of the indoor unit.
Press the QUIET button.
The mark appears in the display.
To cancel, press QUIET button again.
• In QUIET Mode, the fan rotates at a slower speed than the fan speed setting.
• If the unit is already operating with a very low airflow, the fan sound may not
change even if the QUIET button is pressed.
HIGH POWER mode can be used to increase the output of the indoor unit for all
operation modes.
Press the HIGH POWER button while unit is operating.
The mark appears in the display.
To cancel, press HIGH POWER button again.
• When the HIGH POWER button is pressed, the unit operates at maximum
output for 30 minutes, regardless of the desired temperature. The fan speed is
1 step above “High”.
• QUIET Mode and HIGH POWER Mode cannot be used at the same time.
• Pressing the MODE selector button cancels HIGH POWER
mode.
• Depending on the operating conditions, the fan speed may be
increased by a small amount only.
15
SPECIAL REMARKS
‘‘DRY’’ ( ) Operation
Cooling ( ) Operation
Power failure during
operation
Clicking Sound
Remote Controller
How it works? • Once the room temperature reaches the level that was set, the unit’s operation
frequency is changed automatically.
• During DRY operation, the fan speed automatically runs at lower speed for
providing a comfortable breeze.
• ‘‘DRY’’ operation is not possible if the indoor temperature is 59 °F or less.
• Sometimes the indoor unit may not get to the set fan speed such as LOW and
QUIET under cool operation at very low outdoor temperatures due to the
indoor unit being protected from ice or frost when combined with the outdoor
unit for Low Ambient Cooling models.
• In the event of power failure, the unit will stop. When the power is resumed,
the unit will restart automatically within five minutes by the remote controller.
Clicking sound is heard from
the air conditioner
• In cooling operation, any plastic parts may shrink due to a sudden
temperature change. In this event, a clicking sound may occur. This is normal,
and the sound will soon disappear.
• The remote controller sends the setting condition to the air conditioner
regularly at five minute intervals.
16
SETTING THE TIMER
NOTE
Operation Indication
1. Press the CLOCK button once if
the time indicator is not flashing.
The time indication alone flashes.
2. Press the Advance, Return ( ,
) button until PM 10:30 is
displayed.
The time can be set in 1-minute
increments. Holding down the button
advances the time rapidly in 10-minute
increments.
3. Press the CLOCK button again. This completes the setting of the
current time.
In the descriptions below, the following settings are used for the temperature and
time indicator selector button on the bottom front section of the remote controller.
• Temperature: °F
• Time: AM, PM
1. How to set the present
(Example) To set to 10:30 pm.
time
2. How to set the OFF time
(Example) To stop the air conditioner at 11:00 am.
1. Press the OFF TIME setting
button once.
2. Press the Advance, Return ( ,
) button until AM 11:00 is
displayed.
Operation Indication
The timer indication is displayed,
and the present OFF time is shown.
The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the button
advances the time rapidly in 10-minute
increments.
3. Wait a few seconds, and then the
setting is complete.
The timer indication stops
blinking and the present time is
displayed.
17
SETTING THE TIMER (CONTINUED)
Operation Indication
1. Set the timer ON/OFF times as
shown in 2-1, 2, 3 and 3-1, 2, 3.
The present time 10:30 pm. and
are displayed.
• The ON/OFF combination timer uses the current time as the
reference, and it is activated starting from whichever set time
comes first.
• With the ON/OFF combination timer, the settings are repeated
every day.
• You can check the timer ON/OFF times after you have set them
by pressing the ON TIME and OFF TIME setting buttons.
NOTE
NOTE
3. How to set the ON time
4. How to set DAILY ON/OFF
REPEAT timer
(Example) To start operation at 7:10 am.
Operation Indication
1. Press the ON TIME setting
button once.
2. Press the Advance, Return ( ,
) button until AM 7:10 is
displayed.
3. Wait a few seconds, and then
the setting is complete.
(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00 am.
10:30 pm.
Present time
The timer indication is displayed,
and the present ON time is shown.
The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the button
advances the time rapidly in 10-minute
increments.
The timer indication stops
blinking and the present time is
displayed.
7:10 am.
ON
11:00 am.
OFF
To cancel a timer program • Press the CANCEL button.
18
• When either an ON or OFF timer is to be canceled, press the button
corresponding to the timer whose program is to be canceled, and then press
the CANCEL button.
• The airflow direction, fan speed and temperature setting can be changed after
a timer program has been set even when the unit is stopped. Even when
operation is stopped during an ON timer program, the unit will start operating
when the set time is reached provided that the program is not canceled.
• When the ON timer and OFF timer are set to the same time, the timer
operates as if it is turned off.
USING THE 1-HOUR OFF TIMER
NOTE
1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,
regardless of whether the unit is on or off when this button is pressed.
The indicator in the display indicates that this function is operating.
Setting procedure:
Regardless of whether the unit is operating or stopped, press the 1 HR. TIMER
button.
appears in the display.
Cancellation procedure:
Press the ON/OFF operation button to turn the unit off, wait for the unit to stop
operating, and then press the ON/OFF operation button again.
The 1-Hour Timer function is now cancelled and the unit operates normally.
• If, while the 1-Hour Timer function is operating, the 1HR. TIMER button is
pressed once to cancel the function and then again, the unit continues to
operate for one hour from that point in time and then stops.
• It is not possible to use the OFF Timer and 1-Hour OFF Timer together.
Whichever function is set last takes precedence. If the 1 HR. TIMER button is
pressed while the TIMER OFF function operates, the OFF Timer is cancelled
and the unit will stop operating one hour later.
2. Operation together with the
DAILY ON/OFF REPEAT Timer
Avoid • Do not block neither the air intake nor the air outlet. It may cause less
Do • Always try to keep the air filter clean. (Refer to “CARE AND CLEANING”.) A
The 1-Hour OFF Timer setting is given priority over the DAILY ON/OFF REPEAT
setting.
TIPS FOR ENERGY SAVING
performance, and may leads to malfunctions.
• Do not let direct sunlight into the room. Use sunshades, blinds or curtains. If
the walls and ceiling of the room are warmed by the sun, it will take longer to
cool the room.
clogged filter will impair the performance of the unit.
• To prevent conditioned air from escaping, keep windows, doors and any other
openings closed.
19
ADJUSTING THE AIRFLOW DIRECTION
CAUTION
NOTE
CAUTION
1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with your
hands to the left or right.
When the humidity is high, the vertical vanes should be in the front
position during the cooling or dehumidifying operation. If the vertical
vanes are positioned all of the way to the right or left, condensation may
begin to form around the air vent and drip down.
2. Vertical The vertical airflow can be adjusted by moving the flap with the remote controller.
Do not move the flap with your hands. Confirm that the remote controller has
been turned on. Use the FLAP button to set either the sweep function or one of
the six airflow direction settings.
A. Sweep function
The flap starts moving up and down to
deliver air over the sweep range.
C. Auto flap function
The flap is set to the recommended
position.
COOL
DRY
FAN
B. Setting the airflow manually
Referring to the above illustration, use the
FLAP button to set the airflow direction
within the range used during the cooling or
dehumidifying operation.
• The flap automatically closes when the unit is off.
• Use the FLAP button on the remote controller to adjust the position of
the flap. If you move the flap by hand, the flap position according to the
remote controller and the actual flap position may no longer match. If
this should happen, shut off the unit, wait for the flap to close, and then
turn on the unit again; the flap position will now be normal again.
• Do not have the flap pointed down during cooling operation.
Condensation may begin to form around the air vent and drip down.
SWEEP
20
OPERATION WITHOUT THE REMOTE CONTROLLER
OPERATION button
NOTE
CAUTION
INDOOR UNIT If you have lost the remote controller or it has trouble, follow the steps below.
When the air conditioner is not running
Each time the OPERATION button is pressed, the operation mode changes
cyclically.
Cooling operation Stop
The temperature is set to the room temperature minus 4 °F during the cooling
operation, and the fan speed and flap are set to Auto.
CARE AND CLEANING
1. For safety, be sure to turn the air conditioner off and also to disconnect
the power before cleaning.
2. Do not pour water on the indoor unit to clean it. This will damage the
internal components and cause an electric shock hazard.
Casing and Grille (Indoor Unit) Clean the casing and grille of the indoor unit with a vacuum cleaner brush, or
wipe them with a clean, soft cloth.
If these parts are stained, use a clean cloth moistened with a mild liquid
detergent. When cleaning the grille, be careful not to force the vanes out of place.
1. Never use solvents, or harsh chemicals when cleaning the indoor unit.
Do not wipe the plastic casing using very hot water.
2. Some metal edges and the fins are sharp and may cause injury if
handled improperly; be especially careful when you clean these parts.
3. The internal coil and other components of the outdoor unit must be
cleaned every year. Consult your dealer or service center.
21
CARE AND CLEANING (CONTINUED)
Air intake grille
filter
FRONT mark
Hook
Air intake grille
NOTE
Filter The filter behind the air intake grille should be checked and cleaned at least once
every two weeks.
How to remove the filter 1. Grasp both ends of the air
intake grille, and remove it by
opening towards the front and
pulling towards you.
2. Remove the filter attached to
the rear of the air intake grille.
Cleaning Use a vacuum cleaner to remove light dust. If there is sticky dust on the filter,
wash the filter in lukewarm, soapy water, rinse it in clean water, and dry it.
How to replace the filter 1. With the FRONT mark of the
filter at the front, align the two
indentions near the mark with
the hooks at the rear of the air
intake grille, and then mount
the filter.
2. Allow the edge of the air intake
grille to slide into the top of the
indoor unit, and then insert it
all the way inside.
filter
Groove
Pin
Air intake grille
22
3. To attach the air intake grille to
the indoor unit, press its
bottom right and left corners as
well as its bottom center into
place.
Attach so that the round pins at the top right and left corners of the air intake grille
are inserted into the grooves at the top right and left of the indoor unit.
CARE AND CLEANING (CONTINUED)
CAUTION
Cleaning the main unit and
Remote Controller
Removing and remounting the
air intake grille
Washing the grille with water • Clean the grille gently using a soft sponge, or the like. Then wipe away any
• Wipe clean using a soft, dry cloth.
• To remove stubborn dirt, moisten a cloth in warm water no hotter than 104 °F,
wring thoroughly, and then wipe.
• The air intake grille can be removed in order to wash it with water.
Refer to “How to remove the filter” and “How to replace the filter” on page 22.
When using a footstool or the like, be careful not to let it tip over.
remaining moisture.
• Neutral detergent may be used to remove stubborn dirt. Then rinse thoroughly
with water and wipe away any remaining moisture.
WIRED REMOTE CONTROLLER
A separately sold wired remote controller (CZ-RD515U) used with this air
conditioner is also available. If you wish to use the wired remote control function,
you will need to purchase both the optional wired remote controller and its
connection kit (CZ-RC515U).
23
TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
If your air conditioner does not work properly, first check the following points before requesting service. If it still does not
work properly, contact your dealer or service center.
Trouble Possible Cause Remedy
Air conditioner does not run at all. 1. Power failure. 1. Restore power.
2. Leakage circuit breaker tripped.
3. Line voltage is too low. 3. Consult your electrician or dealer.
2. Contact service center.
4. Batteries in remote controller have
run down.
OPERATION lamp blinks and air
conditioner does not operate.
Compressor runs but soon stops. Obstruction in front of condenser coil.
Poor cooling performance. 1. Dirty or clogged air filter. 1. Clean air filter to improve airflow.
Clicking sound is heard from the air
conditioner.
OPERATION lamp lights but outdoor
unit will not run.
Trouble in system. Contact service center.
(Outdoor Unit)
2. Heat source or many people in room. 2. Eliminate heat source if possible.
3. Doors and/or windows are open. 3. Shut them to keep the heat out.
4. Obstacle near air intake or air
discharge port.
5. Thermostat is set too high for cooling. 5. Set the temperature lower.
In cooling operation, any plastic parts
may shrink due to a sudden
temperature change. In this event, a
clicking sound may occur.
The use of cellular phones near the air
conditioner may cause disturbance to its
normal operation.
4. Replace batteries.
Remove obstruction.
4. Remove it to ensure good airflow.
This is normal, and the sound will soon
disappear.
1. Turn off the power then restart the air
conditioner after a while.
2. Consult your dealer.
OPERATING RANGE
The air conditioner is operable within the temperature ranges as listed below:
For Cooling Only Models : CU-KS18NKU, CU-KS24NKU
Temperature Indoor air temperature Outdoor air temperature
COOLING Max. 95 °F DB / 71 °F WB 115 °F DB
Min. 67 °F DB / 57 °F WB 67 °F DB
For Low Ambient Cooling Models : CU-KS18NKUA, CU-KS24NKUA
Temperature Indoor air temperature Outdoor air temperature
COOLING Max. 95 °F DB / 71 °F WB 115 °F DB
Min. 67 °F DB / 57 °F WB 0 °F DB
24
SPECIFICATIONS
Model No.
Heating Capacity
Operation
Sound
Unit Dimensions (H×W×D)
(Indoor unit : Include panel)
Net Weight
Power Source
Cooling Capacity
kW
BTU/h
kW
BTU/h
inch(mm)
lbs.(kg)
Cooling
Operation
Outdoor (Hi)
Indoor(H/M/L)
Outdoor (Hi)
Indoor(H/M/L)
Heating
Operation
dB(A)
dB(A)
Model No.
17,500 [ 4,000 ~ 17,500 ]
Single-phase, 208-230 V, 60 Hz
5.15 [ 1.20 ~ 5.15 ]
-
-
24,200 [ 4,000 ~ 24,200 ]
Single-phase, 208-230 V, 60 Hz
7.10 [ 1.20 ~ 7.10 ]
-
-
Heating Capacity
Operation
Sound
Unit Dimensions (H×W×D)
(Indoor unit : Include panel)
Net Weight
Power Source
Cooling Capacity
kW
BTU/h
kW
BTU/h
inch(mm)
lbs.(kg)
Cooling
Operation
Outdoor (Hi)
Indoor(H/M/L)
Outdoor (Hi)
Indoor(H/M/L)
Heating
Operation
dB(A)
dB(A)
Indoor Unit
CS-KS18NKU
-
42/38/30
-
-
11-23/32×41-15/16×8-5/8
(298×1,065×219)
26.5(12.0)
Indoor Unit
CS-KS24NKU
-
47/44/41
-
-
11-23/32×41-15/16×8-5/8
(298×1,065×219)
26.5(12.0)
Outdoor Unit
CU-KS18NKU, CU-KS18NKUA
51
-
-
-
26-3/8×34-21/32×11-7/32
(670×880×285)
90.4(41.0)
Outdoor Unit
CU-KS24NKU, CU-KS24NKUA
55
-
-
29-1/8×35-7/16×12-19/32
(740×900×320)
119.0(54.0)
-
25
APPENDIX B
CS-KS18NKU + CU-KS18NKU
CS-KS24NKU + CU-KS24NKU
INSTALLATION INSTRCTIONS
+ CU-KS18NKUA
+ CU-KS24NKUA
(852-6-4190-576-00-0)
A-2
INSTALLATION INSTRUCTIONS
Split System Air Conditioner
This air conditioner uses the refrigerant R410A.
NOTE
External diameter of service port R410A: 5/16"
Model Combinations
Combine indoor and outdoor units only as listed
below.
Model No.
Indoor Unit Outdoor Unit
CS-KS18NKU CU-KS18NKU
CU-KS18NKUA
CS-KS24NKU CU-KS24NKU
CU-KS24NKUA
Power Source:
60 Hz, single-phase, 230/208 V
Contents
Page
IMPORTANT!
Please Read Before Starting .................................. 2
1. GENERAL .......................................................... 4
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation
2. INSTALLATION SITE SELECTION ................... 5
2-1. Indoor Unit
2-2. Outdoor Unit
2-3. Baffle Plate for the Outdoor Unit
3. HOW TO INSTALL THE INDOOR UNIT ........... 10
3-1. Remove the Rear Panel from the Unit
3-2. Make a Hole
3-3. Install the Rear Panel on the Wall
3-4. Remove the Grille to Install the Indoor Unit
3-5. Shape the Indoor Side Tubing
3-6. Wiring Instructions
3-7. Recommended Wire Length and Diameter
3-8. Wiring Instructions for Inter-unit Connections
3-9. Mounting
3-10. Drain Hose
4. HOW TO INSTALL THE OUTDOOR UNIT ....... 20
4-1. Wiring Instructions for the Outdoor Unit
5. REFRIGERANT TUBING .................................. 21
5-1. Use of the Flaring Method
5-2. Flaring Procedure with a Flare Tool
5-3. Caution before Connecting Tubes Tightly
5-4. Connecting Tubing between Indoor and
Outdoor Units
5-5. Insulation of Refrigerant Tubing
5-6. Taping the Tubes
5-7. Finishing the Installation
6. AIR PURGING................................................... 23
Air Purging with a Vacuum Pump (for Test Run)
Basic Functions of the Service Valves
Pump Down
Service Valve Connections
7. REMOTE CONTROLLER INSTALLATION
POSITION ......................................................... 27
7-1. Mounting on a Wall
8. ADDRESS SWITCH .......................................... 28
8-1. Address Setting of the Remote Controller
85264190576000 2011
CV6233187204
IMPORTANT!
Please Read Before Starting
This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and efficiently.
When Transporting
Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers.
When Installing…
For safe installation and trouble-free operation, you
must:
Carefully read this instruction booklet before beginning.
Follow each installation or repair step exactly as shown.
Observe all local, state, and national electrical codes.
Pay close attention to all warning and caution notices
given in this manual.
This symbol refers to a hazard
or unsafe practice which can
WARNING
CAUTION
result in severe personal injury
or death.
This symbol refers to a hazard
or unsafe practice which can
result in personal injury or product or property damage.
If Necessary, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
In Case of Improper Installation
The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to
follow the instructions in this document.
SPECIAL PRECAUTIONS
Select an installation location which is rigid and strong
enough to support or hold the unit, and select a location for
easy maintenance.
…In a Ceiling or Wall
Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.
…In a Room
Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.
Keep the fire alarm and the air
CAUTION
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.
…In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.
…In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.
outlet at least 1.5 m away from
the unit.
WARNING
'RQRWVXSSO\SRZHUWRWKHXQLWXQWLODOOZLULQJDQGWXELQJ
are completed or reconnected and checked.
+LJKO\GDQJHURXVHOHFWULFDOYROWDJHVDUHXVHGLQWKLV
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or
death.
*URXQGWKHXQLW following local electrical codes.
&RQQHFWDOOZLULQJWLJKWO\/RRVHZLULQJPD\FDXVHRYHU
heating at connection points and a possible fire hazard.
7RSUHYHQWSRVVLEOHKD]DUGVIURPLQVXODWLRQIDLOXUH
the unit must be grounded.
When Wiring
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.
When Connecting Refrigerant Tubing
:KHQSHUIRUPLQJpiping work
do not mix air except for specified refrigerant (R410A) in
refrigeration cycle. It causes
capacity down, and risk of
explosion and injury due to
high tension inside the refrige-
WARNING
9HQWLODWHWKHURRPZHOOLQWKHHYHQWWKDWUHIULJHUDQW
gas leaks during the installation. Be careful not to allow
contact of the refrigerant gas with a flame as this will
cause the generation of poisonous gas.
2
rant cycle.
5HIULJHUDQWJDVOHDNDJHPD\
cause fire.
'RQRWDGGRUUHSODFHUHIULJHUDQW
other than specified type.
It may cause product damage,
burst and injury etc.
8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ
$SSO\UHIULJHUDQWOXEULFDQWWRWKHPDWFKLQJVXUIDFHVRI
the flare and union tubes before connecting them,
then tighten the nut with a torque wrench for a leakfree connection.
&KHFNFDUHIXOO\IRUOHDNVEHIRUHVWDUWLQJWKHWHVWUXQ
'RQRWOHDNUHIULJHUDQWZKLOHSLSLQJZRUNIRUDQLQVWDOODWLRQ
or re-installation, and while repairing refrigeration parts.
Handle liquid refrigerant carefully as it may cause frostbite.
When Servicing
7XUQWKHSRZHU2)) DWWKHPDLQSRZHUER[PDLQV
before opening the unit to check or repair electrical
parts and wiring.
.HHS\RXUILQJHUVDQGFORWKLQJDZD\IURPDQ\PRYLQJ
parts.
&OHDQXSWKHVLWHDIWHU\RXILQLVKUHPHPEHULQJWRFKHFN
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
Others
CAUTION
9HQWLODWHDQ\HQFORVHGDUHDVZKHQLQVWDOOLQJRUWHVWLQJ
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.
&RQILUPXSRQFRPSOHWLQJLQVWDOODWLRQWKDWQRUHIULJHUDQW
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other heat
source, it can produce dangerously toxic gas.
'RQRWWRXFKWKHDLULQOHWRUWKHVKDUSDOXPLQXP
fins of the outdoor unit. You may get injured.
'RQRWVLWRUVWHSRQWKHXQLW\RXPD\IDOOGRZQ
accidentally.
'RQRWVWLFNDQ\REMHFWLQWRWKH)$1&$6(
You may be injured and the unit may be damaged.
NOTE
The illustrations are based on the typical appearance of
a standard model. Consequently, the shape may differ
from that of the air conditioner that you are installing.
3
1. General
This booklet briefly outlines where and how to install the
air conditioning system. Please read over the entire set
of instructions for the indoor and outdoor units and make
sure all accessory parts listed are with the system before
beginning.
1-1. Tools Required for Installation (not supplied)
1. Standard screwdriver
2. Phillips head screwdriver
3. Knife or wire stripper
4. Tape measure
5. Carpenter’s level
1-2. Accessories Supplied with Unit
Table 1
Parts Figure Q’ty Parts Figure Q’ty
Remote
controller
Remote control
holder
Tapping screw
1
1
Rawl plug
Truss-head
Phillips
5
/32 x5/8" (4x16 mm)
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
11. Tube cutter
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
Parts Figure Q’ty
10
Clamp
8
Cushion
rubber*
1
4
AAA alkaline
battery
2
Drain hose
adapter
1-3. Optional Copper Tubing Kit
Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or air conditioning workshop.
1-4. Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately from
a local source, you will need:
1. Deoxidized annealed copper tube for refrigerant tubing as detailed in Table 2.
Cut each tube to the appropriate lengths 1' to 1'4"
(30 cm to 40 cm) to dampen vibration between units.
Table 2
1
*Packed in the outdoor unit.
2. Foamed polyethylene insulation for the specified
copper tubes as required to precise length of tubing.
Wall thickness of the insulation should be not less
than 5/16" (8 mm).
3. Use insulated copper wire for field wiring. Wire size
varies with the total length of wiring. Refer to 3-6.
Wiring Instructions for details.
CAUTION
Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.
Model
CS-KS18NKU 1/4" (6.35 mm) 0.0314" (0.8 mm) 1/2" (12.70 mm) 0.0314" (0.8 mm)
CS-KS24NKU 1/4" (6.35 mm) 0.0314" (0.8 mm) 5/8" (15.88 mm) 0.0393" (1.0 mm)
Outer Dia. Thickness Outer Dia. Thickness
Narrow Tube Wide Tube
4
1-5. Additional Materials Required for Installation
1. Refrigeration (armored) tape
2. Insulated staples or clamps for connecting wire
(See local codes.)
3. Putty
4. Refrigeration lubricant
5. Clamps or saddles to secure refrigerant tubing
Indoor unit
Drain hose
2. Installation Site Selection
2-1. Indoor Unit
WARNING
AVOID:
direct sunlight.
nearby heat sources that may affect performance of the unit.
areas where leakage of flammable gas may be expected.
places where large amounts of oil mist exist.
DO:
select an appropriate position from which every corner of
the room can be uniformly cooled. (High on a wall is best.)
select a location that will hold the weight of the unit.
select a location where tubing and drain hose have the
shortest run to the outside. (Fig. 1)
To prevent abnormal heat generation and the possibility of fire, do
not place obstacles, enclosures
and grilles in front of or surrounding the air conditioner in a way
that may block air flow.
2" (5 cm)
min.
Elevation
difference (H)
INDOOR
UNIT
Outside drainage
Fig. 1
6" (15 cm)
min.
Front View
Fig. 2
Tubing length (L)
OUTDOOR
UNIT
Fig. 3a
2" (5 cm)
min.
allow room for operation and maintenance as well as unre-
stricted air flow around the unit. (Fig. 2)
install the unit within the maximum elevation difference (H)
above or below the outdoor unit and within a total tubing length
(L) from the outdoor unit as detailed in Table 3 and Fig. 3a.
install the indoor unit more than 3.3' (1 m) away from any
antenna or power lines or connecting wires used for television,
radio, telephone, security system, or intercom. Electrical noise
For stable operation of the
air conditioner, do not
install wall-mounted type
indoor units less than 5'
(1.5 m) from floor level.
CAUTION
Indoor unit
Minimum height
from floor level
5' (1.5 m)
from any of these sources may affect operation.
Floor level
Table 3
Max. Allowable Tubing Limit of Tubing Limit of Elevation Required Amount of
Model Length at Shipment Length (L) Difference (H) Additional Refrigerant
(ft.) (ft.) (ft.) (oz./ft.)*
CS-KS18NKU 25 100 50 0.27
CS-KS24NKU 33
* If total tubing length becomes 25 to 100 ft. (Max.) or 33 to 132 or 100 ft. (Max.), charge additional refrigerant (R410A) by 0.27 oz./ft.
No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.
CU-KS24NKU CU-KS24NKUA
132 100
5
50 0.27
Fig. 3b
Wall
2-2. Outdoor Unit
)
AVOID:
heat sources, exhaust fans, etc. (Fig. 4)
damp, humid or uneven locations.
NO
Hot air
Exhaust fan
Heat source
DO:
choose a place as cool as possible.
choose a place that is well ventilated.
allow enough room around the unit for air intake/
exhaust and possible maintenance. (Fig. 5a or 5b)
provide a solid base (level concrete pad, concrete block,
4" 1'4" (10 40 cm) or 6" 1'4" (15 40 cm) beams
or equal), a minimum of 4" (10 cm) or 6" (15 cm) above
ground level to reduce humidity and protect the unit
against possible water damage and decreased service
life. (Fig. 5c or 5d)
install cushion rubber under unit’s feet to reduce
vibration and noise. (Fig. 5e)
use lug bolts or equal to bolt down unit, reducing
vibration and noise.
install in a location where no antenna of a television
or radio exists within 10' (3 m).
(CU-KS18NKU)
(CU-KS18NKUA)
Anchor bolts
(4 pcs.)
Outdoor unit
(CU-KS18NKU)
(CU-KS18NKUA)
Air intake Min. 4" (10 cm)
Min.
2" (5 cm)
Air discharge
Min.
1'4" (40 cm)
(CU-KS24NKU)
(CU-KS24NKUA)
Fig. 4
Valve
side
Min. 10"
(25 cm)
Fig. 5a
Obstacle above
Min.
7' (2 m)
Air discharge
Ground
Obstacle above
Min. 4" (10 cm
Air intake
Min.
7' (2 m)
Obstacle
Air intake
Concrete
or equal
About 1'4" (40 cm)
(CU-KS24NKU)
(CU-KS24NKUA)
Air intake
Concrete
or equal
Fig. 5c
Min. 4" (10 cm)
About 4" (10 cm)
Anchor bolts
(4 pcs.)
Min. 6" (15 cm)
Air intake Min. 6" (15 cm)
Min.
4" (10 cm)
Air discharge
Valve
side
Min. 10"
(25 cm)
Min.
1'8" (50 cm)
Fig. 5b
Min.
7' (2 m)
Air discharge
Ground
Cushion rubber
Min. 6" (15 cm)
Air intake
Min.
7' (2 m)
Obstacle
About 1'4" (40 cm)
Fig. 5d
About 6" (15 cm)
Fig. 5e
6
2-3. Baffle Plate for the Outdoor Unit
(CU-KSxxNKUA models only)
Air intake baffle
NOTE
It is recommended to use baffle plates for models
CU-KS18NKUA and CU-KS24NKUA. The baffle plates
are not normally required for the other models.
When the outdoor unit is installed in a position exposed
to strong wind (such as seasonal winds with low air temperature in winter), baffle plates must be installed on the
outdoor unit. (Fig. 5f)
This unit is designed so that the fan of the outdoor unit
runs at low speed when the air conditioner is operated at
low outdoor air temperatures. When the outdoor unit is
exposed to strong wind, the system pressure drops
because of the freeze protector.
Install a pair of windbaffle plates at the front and back of
the outdoor unit if it will be subject to strong wind during
the winter. (Figs. 5f, 5g, 5h, 5i, and 5j)
Wind
Back
No air intake baffle
required on
this side.
Front
Wind
Air discharge baffle
Fig. 5f
7
(1) Recommended dimensions of the baffle plates
Air Intake Baffle
C
E
D
F
A
3- 1/4"
(3- 6.5 mm)
2- 15/64"
(2- 6 mm)
R
Q
Air Discharge Baffle
H
O
I
B
J
L
I
K
E
A
F
H
4- 1/4"
(4- 6.5 mm)
G
G
J
C
K
B
G
Fig. 5g Fig. 5h
For Air Intake
Dimensions
Model
CU-KS18NKUA
CU-KS24NKUA
(inch)
(mm) 620 20 45 565 235 235 10 20 15 587 7.5 10 150 20 20
(inch)
(mm) 640 20 50 635 270 270 10 20 15 657 7.5 10 150 20 20
ABCDEFGH I JKLOQR
24-13/32
25-3/16 25/32 1-31/32 25 10-5/8 10-5/8 25/64 25/32 19/32 25-7/8 19/64 25/64 5-29/32 25/32 25/32
25/32 1-25/32 22-1/4 9-1/4 9-1/4 25/64 25/32 19/32 23-1/8 19/64 25/64 5-29/32 25/32 25/32
For Air Discharge
Dimensions
Model
CU-KS18NKUA
CU-KS24NKUA
(inch)
(mm) 530 560 350 150 460 35 55 440 60 85 25
(inch)
(mm) 560 585 350 150 490 35 55 465 60 85 25
ABCDEFGH I JK
20-7/8 22-1/16
22-1/16 23-1/32
13-25/32
5-29/32 18-1/8 1-3/8 2-5/32 17-5/16 2-3/8 3-11/32 31/32
13-25/32
5-29/32 19-9/32 1-3/8 2-5/32 18-5/16 2-3/8 3-11/32 31/32
Material to be used: Metal plate with corrosion protection treatment
Plate thickness: 0.0394 to 0.0472" (1.0 to 1.2 mm)
(2) Parts required (field supply except for screws)
D
Air Intake Baffle
Item Q’ty Remarks
Baffle plate 1
Screw 5/32 15/32" (4 12 mm) tapping 2 Attached to outdoor unit
Bolt 15/64 19/32 – 25/32" (M6 15 – 20 mm) 3
Nut 15/64" (M6) 3
Washer 3
Spring washer 3
8
Air Discharge Baffle
Item Q’ty Remarks
Baffle plate 1
Bolt 15/64 13/32 – 19/32" (M6 10 – 15 mm) 4
Nut 15/64" (M6) 4
Washer 4
Spring washer 4
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