TECHNICAL & SERVICE MANUAL
CS-KS18NKU + CU-KS18NKU
+ CU-KS18NKUA
CS-KS24NKU + CU-KS24NKU
+ CU-KS24NKUA
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No. Product Code No.
Outdoor Model No. Product Code No.
CS-KS18NKU
CS-KS24NKU
1 852 360 90
1 852 360 91
CU-KS18NKU
CU-KS18NKUA
CU-KS24NKU
CU-KS24NKUA
1 852 361 18
1 852 361 19
1 852 361 21
1 852 361 22
Indoor Unit
Outdoor Unit
A
I
R
C
O
D
I
T
I
O
N
E
R
CS-KS18NKU
CS-KS24NKU
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
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Warning
If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite.
Prohibit
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."
Prohibit
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
Do not wash the air conditioner with water, as this may cause an electric shock or fire.
Prohibit
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.
Prohibit
Prohibit
Do not hold the sharp end of the unit or the aluminum fins, as it may cause an injury to your hand or finger.
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
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Table of Contents
Page
6
1. OPERATING RANGE ...................................................................................................................
2. SPECIFICATIONS
2-1. Unit Specifications .............................................................................................................
7
2-2. Major Component Specifications ....................................................................................... 15
2-3. Other Component Specifications ....................................................................................... 21
3. DIMENSIONAL DATA ..................................................................................................................... 22
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram ................................................................................................... 25
5. PERFORMANCE DATA
5-1. Temperature Charts ............................................................................................................ 26
5-2. Cooling Capacity ................................................................................................................. 30
5-3. Cooling Capacity (Low Ambient) ......................................................................................... 32
5-4. Air Throw Distance Charts ................................................................................................. 34
6. ELECTRICAL DATA
6-1. Electrical Characteristics .................................................................................................... 36
6-2. Electric Wiring Diagrams .................................................................................................... 38
7. MAINTENANCE
7-1. Address Setting of the Remote Control Unit ....................................................................... 42
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit .................................. 43
8. FUNCTIONS
8-1. Operation Functions ........................................................................................................... 44
8-2. Protective Functions ........................................................................................................... 46
9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
9-1. Precautions before Performing Inspection or Repair ........................................................... 47
9-2. Method of Self-Diagnostics ................................................................................................. 47
9-3. Checking the Indoor and Outdoor Units .............................................................................. 50
9-4. Trouble Diagnosis of Fan Motor .......................................................................................... 54
9-5. Noise Malfunction and Electromagnetic Interference .......................................................... 56
10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation Resistance ............................................................................... 57
10-2. Checking Continuity of Fuse on PCB Ass'y ......................................................................... 58
4
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Page
11. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1. Characteristics of New Refrigerant R410A ......................................................................... 59
11-2. Checklist before Servicing ................................................................................................... 60
11-3. Tools Specifically for R410A ................................................................................................ 61
11-4. Tubing Installation Procedures ............................................................................................ 61
11-5. In Case of Compressor Malfunction .................................................................................... 62
11-6. In Case Refrigerant is Leaking ............................................................................................ 64
11-7. Charging Additional Refrigerant .......................................................................................... 65
11-8. Retro-Fitting Existing Systems ............................................................................................ 65
APPENDIX A Operating Instructions ............................................................................................ A-1
APPENDIX B INSTALLATION INSTRUCTIONS ............................................................................ A-2
5
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1. OPERATING RANGE
Models : CS-KS18NKU + CU-KS18NKU
CS-KS24NKU + CU-KS24NKU
Temperature
Maximum
Indoor Air Intake Temp.
Outdoor Air Intake Temp.
115 °F DB
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
Cooling
Minimum
67 °F DB
Models : CS-KS18NKU + CU-KS18NKUA
CS-KS24NKU + CU-KS24NKUA
Temperature
Maximum
Indoor Air Intake Temp.
Outdoor Air Intake Temp.
115 °F DB
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
Cooling
Minimum
0 °F DB
6
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2. SPECIFICATIONS
2-1. Unit Specifications
Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKU
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling
17,500 ( 4,000 to 17,500 )
5.15 ( 1.2 to 5.15 )
13,100
Total Capacity
BTU/h
kW
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
4,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
524 (890) / 441 (749) / 377 (641)
4.89
V
A
W
187 to 253
7.0
( 1.2 to 7.0 )
1,500 ( 250 to 1,500 )
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
93
11.7
20
17.5
A
15
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expansion Valve
42 / 38 / 30 / 28
51
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
25 (7.5)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
1/2 (12.7)
Optional
Indoor Unit
Outdoor Unit
26-3/8 × 34-21/32 × 11-7/32
(670 × 880 × 285)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 28-27/32 × 39-27/32 × 14-29/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(733 × 1,012 × 379)
90.4 (41.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
99.2 (45.0)
9.88 (0.28)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
7
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Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKU
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling
17,500 ( 4,000 to 17,500 )
5.15 ( 1.2 to 5.15 )
13,100
Total Capacity
BTU/h
kW
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
4,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
524 (890) / 441 (749) / 377 (641)
4.89
V
A
W
187 to 253
7.7
( 1.2 to 7.7 )
1,500 ( 250 to 1,500 )
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
94
11.7
20
17.5
A
15
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expansion Valve
42 / 38 / 30 / 28
51
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
25 (7.5)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
1/2 (12.7)
Optional
Indoor Unit
Outdoor Unit
26-3/8 × 34-21/32 × 11-7/32
(670 × 880 × 285)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 28-27/32 × 39-27/32 × 14-29/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(733 × 1,012 × 379)
90.4 (41.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
99.2 (45.0)
9.88 (0.28)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
8
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Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKU
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,200 ( 4,000 to 24,200 )
7.1
( 1.2 to 7.1 )
14,800
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
9,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
659 (1,120) / 571 (970) / 494 (839)
4.89
187 to 253
10.8 ( 1.3 to 10.8 )
2,460 ( 280 to 2,460 )
V
A
W
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
99
9.8
17
17.5
A
20
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expansion Valve
47 / 44 / 41 / 30
55
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
33 (10)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
5/8 (15.88)
Optional
Indoor Unit
inch 11-23/32 × 41-15/16 × 8-5/8
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
Unit Dimensions
Height × Width × Depth
Package Dimensions
(mm)
inch
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 34-3/16 × 41-11/32 × 16-21/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(868 × 1,050 × 423)
119.0 (54.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
127.9 (58.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
9
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Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKU
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,200 ( 4,000 to 24,200 )
7.1
( 1.2 to 7.1 )
14,800
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
9,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
659 (1,120) / 571 (970) / 494 (839)
4.89
187 to 253
12.1 ( 1.3 to 12.1 )
2,460 ( 280 to 2,460 )
V
A
W
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
98
9.8
17
17.5
A
20
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expansion Valve
47 / 44 / 41 / 30
55
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
33 (10)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
5/8 (15.88)
Optional
Indoor Unit
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 34-3/16 × 41-11/32 × 16-21/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(868 × 1,050 × 423)
119.0 (54.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
127.9 (58.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
10
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Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKUA
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling
17,500 ( 4,000 to 17,500 )
5.15 ( 1.2 to 5.15 )
13,100
Total Capacity
BTU/h
kW
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
4,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
524 (890) / 441 (749) / 377 (641)
4.89
V
A
W
187 to 253
7.0
( 1.2 to 7.0 )
1,500 ( 250 to 1,500 )
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
93
11.7
20
17.5
A
15
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi and multi steps)
Airflow Direction (Indoor)
Manual
Auto
Vertical
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expansion Valve
42 / 38 / 30 / 28
51
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
25 (7.5)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
1/2 (12.7)
Optional
Indoor Unit
Outdoor Unit
26-3/8 × 34-21/32 × 11-7/32
(670 × 880 × 285)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 28-27/32 × 39-27/32 × 14-29/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(733 × 1,012 × 379)
90.4 (41.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
99.2 (45.0)
9.88 (0.28)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
11
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Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKUA
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling
17,500 ( 4,000 to 17,500 )
5.15 ( 1.2 to 5.15 )
13,100
Total Capacity
BTU/h
kW
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
4,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
524 (890) / 441 (749) / 377 (641)
4.89
V
A
W
187 to 253
7.7
( 1.2 to 7.7 )
1,500 ( 250 to 1,500 )
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
94
11.7
20
17.5
A
15
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi and multi steps)
Airflow Direction (Indoor)
Manual
Auto
Vertical
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Electric Expansion Valve
42 / 38 / 30 / 28
51
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
25 (7.5)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
1/2 (12.7)
Optional
Indoor Unit
Outdoor Unit
26-3/8 × 34-21/32 × 11-7/32
(670 × 880 × 285)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 28-27/32 × 39-27/32 × 14-29/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(733 × 1,012 × 379)
90.4 (41.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
99.2 (45.0)
9.88 (0.28)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
12
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Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKUA
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,200 ( 4,000 to 24,200 )
7.1
( 1.2 to 7.1 )
14,800
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
9,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
659 (1,120) / 571 (970) / 494 (839)
4.89
187 to 253
10.8 ( 1.3 to 10.8 )
2,460 ( 280 to 2,460 )
V
A
W
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
99
9.8
17
17.5
A
20
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi and multi steps)
Airflow Direction (Indoor)
Manual
Auto
Vertical
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expansion Valve
47 / 44 / 41 / 30
55
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
33 (10)
1/4 (6.35)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
Refrigerant Tube Kit
5/8 (15.88)
Optional
Indoor Unit
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 34-3/16 × 41-11/32 × 16-21/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(868 × 1,050 × 423)
119.0 (54.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
127.9 (58.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
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Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKUA
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,200 ( 4,000 to 24,200 )
7.1
( 1.2 to 7.1 )
14,800
Sensible Capacity
Latent Capacity
BTU/h
BTU/h
9,400
Air Circulation (Hi/Me/Lo)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
ft3/min (m3/h)
Pints/h
659 (1,120) / 571 (970) / 494 (839)
4.89
187 to 253
12.1 ( 1.3 to 12.1 )
2,460 ( 280 to 2,460 )
V
A
W
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
%
BTU/h/W
BTU/Wh
A
98
9.8
17
17.5
A
20
Microprocessor / I.C. Thermistor
Wireless Remote Control Unit
Timer
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Auto and 3 steps / Auto (Hi and multi steps)
Airflow Direction (Indoor)
Manual
Auto
Vertical
Air Filter
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Washable, Anti-Mold
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Electric Expansion Valve
47 / 44 / 41 / 30
55
Ibs (g)
Operation Sound
(*Qt = Quiet mode)
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
Refrigerant Tubing Connections
Flare Type
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
33 (10)
1/4 (6.35)
Refrigerant
Narrow tube
Tube Diameter
Refrigerant Tube Kit
Wide tube
5/8 (15.88)
Optional
Indoor Unit
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
Unit Dimensions
Height × Width × Depth
Package Dimensions
inch
(mm)
inch
11-23/32 × 41-15/16 × 8-5/8
(298 × 1,065 × 219)
11-27/32 × 45-1/8 × 15-5/32 34-3/16 × 41-11/32 × 16-21/32
Height × Width × Depth
(mm)
(301 × 1,146 × 385)
26.5 (12.0)
(868 × 1,050 × 423)
119.0 (54.0)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
4.59 (0.13)
127.9 (58.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WB
14
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2-2. Major Component Specifications
2-2-1. Indoor Unit
Indoor Unit
CS-KS18NKU
Control PCB
Part No.
Controls
CB-CS-KS18NKU
Microprocessor
250V 3A
Control Circuit Fuse
Fan
Type
Q'ty ... Dia. and Length
Cross-Flow
inch (mm)
1 ... D3-5/8 / L33-9/32 (D92/L845)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-41CVJ-D847-3 ... 1
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
8
1,250
30
W
Coil Resistance
Ohm
-
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
-
-
Micro F
VAC
Flap Motor
Type
Stepping Motor
MP24Z3
Model
Rating
DC 12V
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
2
Fins per inch
Face Area
19.5
3.07 (0.285)
ft2 (m2)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
15
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Indoor Unit
CS-KS24NKU
Control PCB
Part No.
Controls
CB-CS-KS24NKU
Microprocessor
250V 3A
Control Circuit Fuse
Fan
Type
Q'ty ... Dia. and Length
Cross-Flow
inch (mm)
1 ... D3-5/8 / L33-9/32 (D92/L845)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-41CVJ-D847-3 ... 1
No. of Poles
Rough Measure RPM (Cool)
Nominal Output
8
1,500
30
W
Coil Resistance
Ohm
-
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
-
-
Micro F
VAC
Flap Motor
Type
Stepping Motor
MP24Z3
Model
Rating
DC 12V
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
2
Fins per inch
Face Area
19.5
3.07 (0.285)
ft2 (m2)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
16
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2-2-2. Outdoor Unit
Outdoor Unit CU-KS18NKU
Control PCB
Part No.
Controls
CB-CU-KS18NKU
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
C-6RVN93H0M / 1,050W
FV50S ... 0.74 (350)
U - V : 0.482
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
Pints (cc)
V - W : 0.482
W - U : 0.482
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
-
-
VAC
Crankcase Heater
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D16-17/32 (D420)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-67FV-F460-1 ... 1
No. of Poles
8
Rough Measure RPM (Cool)
Nominal Output
820
50
W
Coil Resistance
Ohm
RED - WHT : 77.5
WHT - BLU : 77.5
BLU - RED : 77.5
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over- Current Protection
Run Capacitor
Yes
-
-
Micro F
VAC
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
21.2
ft2 (m2)
5.49 (0.510)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
17
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Outdoor Unit CU-KS24NKU
Control PCB
Part No.
Controls
CB-CU-KS24NKU
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
G8T265FU1JW / 2,410W
FV50S ... 1.49 (700)
U - V : 0.36
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm
Pints (cc)
V - W : 0.36
W - U : 0.36
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
-
-
VAC
Crankcase Heater
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D18-1/8 (D460)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-71FW-D490-1 ... 1
No. of Poles
8
Rough Measure RPM (Cool)
Nominal Output
850
90
W
Coil Resistance
Ohm
-
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
-
-
Micro F
VAC
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
18.1
ft2 (m2)
6.40 (0.595)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
18
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Outdoor Unit CU-KS18NKUA
Control PCB
Part No.
Controls
CB-CU-KS18NKUA
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
C-6RVN93H0M / 1,050W
FV50S ... 0.74 (350)
R - S : 0.482
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
Pints (cc)
S - T : 0.482
T - R : 0.482
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
-
-
VAC
Crankcase Heater
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D16-17/32 (D420)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-67FV-F460-1 ... 1
No. of Poles
8
Rough Measure RPM (Cool)
Nominal Output
820
50
W
Coil Resistance
Ohm
RED - WHT : 77.5
WHT - BLU : 77.5
BLU - RED : 77.5
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over- Current Protection
Run Capacitor
Yes
-
-
Micro F
VAC
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
21.2
ft2 (m2)
5.49 (0.510)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
19
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Outdoor Unit CU-KS24NKUA
Control PCB
Part No.
Controls
CB-CU-KS24NKUA
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
G8T265FU1JW / 2,410W
FV50S ... 1.49 (700)
U - V : 0.36
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm
Pints (cc)
V - W : 0.36
W - U : 0.36
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
VAC
-
Crankcase Heater
230V 30W
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D18-1/8 (D460)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-71FW-D490-1 ... 1
No. of Poles
8
Rough Measure RPM (Cool)
Nominal Output
850
90
W
Coil Resistance
Ohm
-
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
-
-
Micro F
VAC
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
18.1
ft2 (m2)
6.40 (0.595)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
20
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2-3. Other Component Specifications
Indoor Unit
CS-KS18NKU
CS-KS24NKU
Outdoor Unit CU-KS18NKU CU-KS24NKU
CU-KS18NKUA CU-KS24NKUA
Indoor heat exchanger sensor
(Model:PTM-D51H-S4-2 TH1)
Compressor temp sensor
(Model:TKS 293B)
Indoor air temp sensor
(Model:PTM-D51H-S4-2 TH2)
10
9
8
7
6
5
4
3
2
1
0
200
180
160
140
120
100
80
60
40
20
0
50
59 68 77 86 95 104
32 50 68 86 104 122 140 158 176 194
(0) (10)(20) (30) (40)(50) (60) (70)(80) (90)
(10) (15) (20) (25) (30) (35) (40)
Temperature °F (°C)
Temperature °F (°C)
Outdoor air temp sensor
(Model:TKS295B)
Outdoor heat exchanger sensor
(Model:TKS292B)
40
35
30
25
20
15
10
5
0
-
4
5
14 23 32 41 50 59 68
10) ( 5) (0) (5) (10) (15) (20)
Temperature °F (°C)
(
-
20)(
-
15)(
-
-
21
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3. DIMENSIONAL DATA
Indoor Unit
CS-KS18NKU
CS-KS24NKU
Unit: inch(mm)
(852-0-0010-216-00-0)
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Outdoor Unit CU-KS18NKU
CU-KS18NKUA
Unit: inch(mm)
(852-0-0010-133-00-0)
23
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Outdoor Unit CU-KS24NKU
CU-KS24NKUA
23-15/16
5-11/32
15/32
11-17/32
Narrow tube service valve
dia.1/4" (6.35)
35-7/16(900)
2-15/16
Wide tube service valve
dia.5/8" (15.88)
2-1/32
4-1/2
1-21/32
2-7/8
Unit: inch(mm)
(852-0-0010-119-00-0)
24
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4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
Indoor Unit
CS-KS18NKU
CS-KS24NKU
Outdoor Unit CU-KS18NKU
CU-KS24NKU
CU-KS18NKUA CU-KS24NKUA
Indoor unit
Outdoor unit
Wide tube
service
valve
Wide tube
Accumulator
Muffler
*1
High pressure
switch
H.P.
Electric
expansion
valve
Narrow
tube
service
valve
M
Narrow tube
O.D.
1/4"
(6.35 mm)
Cooling cycle
...
...
*1 O.D.1/2"(12.7mm)
CS/CU-KS18NKU CU-KS18NKUA
CS/CU-KS24NKU CU-KS24NKUA
O.D.5/8"(15.88mm)
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).
Insulation
Thickness:
Min. 5/16"(8 mm)
Thickness:
Min. 5/16"(8 mm)
Narrow tube
After a tube has been insulated,
never try to bend it into a narrow
Wide tube
CAUTION
curve because it can cause the tube
to break or crack.
25
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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)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
Outdoor inlet air DB temp. °F(°C)
(2) Operating current performance chart
8
Lo fan
Hi Fan
7
6
5
4
3
2
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
Outdoor inlet air DB temp. °F(°C)
(3) Indoor discharge air performance chart
64.4 (18)
Lo fan
Hi Fan
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
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.
26
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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)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air DB temp. °F(°C)
(2) Operating current performance chart
8
Lo fan
Hi Fan
7
6
5
4
3
2
-4
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
(-20)
Outdoor inlet air DB temp. °F(°C)
(3) Indoor discharge air performance chart
64.4 (18)
Lo fan
Hi Fan
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
-4
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
(-20)
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.
27
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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)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
Outdoor inlet air DB temp. °F(°C)
(2) Operating current performance chart
14
13
12
11
10
Lo fan
Hi Fan
9
8
7
6
5
4
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
Outdoor inlet air DB temp. °F(°C)
(3) Indoor discharge air performance chart
68.0 (20)
Lo fan
Hi Fan
64.4 (18)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
42.8 (6)
68
77
(25)
86
(30)
95
(35)
104
(40)
(20)
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
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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)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air DB temp. °F(°C)
(2) Operating current performance chart
14
Lo fan
Hi Fan
13
12
11
10
9
8
7
6
5
4
-4
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
(-20)
Outdoor inlet air DB temp. °F(°C)
(3) Indoor discharge air performance chart
68.0 (20)
Lo fan
Hi Fan
64.4 (18)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
42.8 (6)
-4
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
(-20)
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
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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
65
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
524 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
CI
16,270
0.87
16,440
1.04
16,590
1.21
16,040
1.36
15,320
1.54
10,700
1.24
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,400
14,130
15,960
16,270
16,270
12,500
14,230
16,060
16,440
16,440
12,610
14,340
16,060
16,590
16,590
12,300
14,030
15,860
16,040
16,040
12,000
13,720
15,320
15,320
15,320
9,860
10,700
10,700
10,700
10,700
59
(15.0)
TC
CI
18,460
0.88
17,920
1.06
17,330
1.23
16,770
1.39
16,040
1.57
10,940
1.24
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
11,080
12,810
14,640
16,370
18,100
10,880
12,610
14,340
16,060
17,790
10,570
12,300
14,130
15,860
17,330
10,370
12,000
13,830
15,560
16,770
9,960
7,830
9,550
10,940
10,940
10,940
63
(17.2)
11,690
13,520
15,250
16,040
TC
CI
19,190
0.89
18,650
1.08
18,060
1.26
# 17,500
1.42
16,560
1.59
11,150
1.24
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,050
8,740
8,540
8,330
7,930
9,660
11,490
13,110
14,840
5,790
7,520
9,350
11,080
11,150
67
(19.4)
10,780
12,500
14,230
15,960
10,470
12,300
14,030
15,760
10,270
12,100
13,830
15,450
10,060
11,790
13,520
15,250
TC
CI
19,880
0.91
19,350
1.10
18,760
1.29
18,220
1.45
16,840
1.59
11,330
1.24
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,810
8,540
10,270
12,000
13,720
6,600
8,330
10,060
11,790
13,520
6,400
8,130
9,860
11,590
13,320
6,200
7,930
9,660
11,390
13,110
5,690
7,420
9,150
10,880
12,610
3,760
5,490
7,210
8,940
10,670
71
(21.7)
TC
CI
20,470
0.93
19,940
1.13
19,350
1.32
18,830
1.48
17,030
1.59
11,450
1.24
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,300
8,130
9,860
11,590
6,200
7,930
9,660
11,390
5,990
7,720
9,450
11,180
5,790
7,620
9,350
10,980
5,180
7,010
8,740
10,470
3,450
5,280
6,910
8,640
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
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Indoor Unit
: CS-KS24NKU
Outdoor Unit : CU-KS24NKU / CU-KS24NKUA
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
24,200 BTU/h
65
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
659 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
CI
21,050
1.39
21,240
1.65
21,410
1.91
21,470
2.13
18,230
2.04
11,020
1.40
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,690
17,730
19,910
21,050
21,050
15,810
17,860
20,040
21,240
21,240
15,810
17,990
20,040
21,410
21,410
15,940
17,990
20,170
21,470
21,470
14,280
16,330
18,230
18,230
18,230
10,950
11,020
11,020
11,020
11,020
59
(15.0)
TC
CI
25,430
1.41
24,710
1.68
23,910
1.95
23,200
2.17
18,670
2.04
11,270
1.40
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
14,920
16,970
19,140
21,190
23,240
14,530
16,580
18,760
20,810
22,980
14,150
16,200
18,370
20,420
22,470
13,770
15,810
17,990
20,170
22,210
11,720
13,770
15,940
17,990
18,670
8,640
63
(17.2)
10,690
11,270
11,270
11,270
TC
CI
26,410
1.43
25,690
1.72
24,890
2.00
# 24,200
2.22
19,060
2.04
11,490
1.40
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,230
14,410
16,580
18,630
20,680
11,970
14,020
16,200
18,250
20,290
11,590
13,640
15,810
17,860
20,040
11,330
13,380
15,560
17,610
19,650
9,160
6,340
8,390
10,570
11,490
11,490
67
(19.4)
11,210
13,380
15,430
17,480
TC
CI
27,350
1.46
26,640
1.76
25,840
2.05
25,180
2.27
19,390
2.04
11,670
1.40
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,540
9,160
8,900
8,640
6,470
8,520
10,690
12,740
14,790
3,780
5,830
8,000
10,180
11,670
71
(21.7)
11,590
13,770
15,810
17,860
11,330
13,380
15,560
17,610
10,950
13,130
15,170
17,220
10,690
12,870
14,920
16,970
TC
CI
28,120
1.50
27,420
1.80
26,630
2.10
26,020
2.32
19,600
2.04
11,790
1.40
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,900
8,640
8,260
8,130
5,960
8,130
10,180
12,230
3,520
5,700
7,750
9,800
10,950
13,130
15,170
10,690
12,870
14,920
10,440
12,490
14,660
10,310
12,360
14,410
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
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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. oF (oC)
AMBIENT TEMP. oF (oC)
WB
DB
0
5
15
(-9.4)
25
(-3.9)
35
(1.7)
45
(7.2)
55
(12.8)
(-17.8)
(-15.0)
TC
CI
15,050
0.71
15,040
0.74
15,010
0.76
15,140
0.63
15,200
0.61
15,260
0.58
15,230
0.61
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
11,790
13,520
15,050
15,050
15,050
11,790
13,520
15,040
15,040
15,040
11,790
13,520
15,010
15,010
15,010
15,140
15,140
15,140
15,140
15,140
11,890
13,620
15,200
15,200
15,200
11,890
13,620
15,260
15,260
15,260
11,890
13,620
15,230
15,230
15,230
59
(15.0)
TC
CI
15,050
0.81
15,050
0.84
15,090
0.85
15,350
0.69
15,480
0.65
15,620
0.61
15,640
0.62
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,550
9,550
9,550
15,350
15,350
15,350
15,350
15,350
9,760
9,860
9,860
63
(17.2)
11,280
13,110
14,740
15,050
11,280
13,110
14,740
15,050
11,280
13,110
14,840
15,090
11,490
13,220
14,950
15,480
11,490
13,320
15,050
15,620
11,590
13,320
15,050
15,640
TC
CI
14,890
0.93
14,920
0.96
15,040
0.95
15,460
0.76
15,680
0.70
15,910
0.64
16,000
0.64
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
7,210
8,940
10,780
12,500
14,230
7,210
8,940
10,780
12,500
14,230
7,320
9,050
10,880
12,500
14,230
15,460
15,460
15,460
15,460
15,460
7,520
9,250
11,080
12,810
14,540
7,620
9,350
11,180
12,910
14,640
7,720
9,450
11,180
12,910
14,640
67
(19.4)
TC
CI
14,550
1.07
14,610
1.09
14,820
1.07
15,440
0.84
15,780
0.76
16,120
0.68
16,290
0.67
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
4,880
6,500
8,330
10,060
11,790
4,880
6,600
8,330
10,060
11,790
4,880
6,600
8,440
10,160
11,890
15,440
15,440
15,440
15,440
15,440
5,280
7,010
8,740
10,470
12,200
5,380
7,110
8,940
10,670
12,300
5,490
7,210
8,940
10,670
12,400
71
(21.7)
TC
CI
14,050
1.21
14,130
1.23
14,450
1.19
15,300
0.93
15,760
0.83
16,210
0.73
16,470
0.70
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
4,260
5,990
7,720
9,450
4,260
6,100
7,830
9,450
4,370
6,200
7,930
9,550
15,300
15,300
15,300
15,300
4,770
6,600
8,330
10,060
4,880
6,710
8,440
10,160
4,980
6,810
8,540
10,270
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
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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. oF (oC)
AMBIENT TEMP. oF (oC)
WB
DB
0
5
15
(-9.4)
25
(-3.9)
35
(1.7)
45
(7.2)
55
(12.8)
(-17.8)
(-15.0)
TC
CI
21,090
1.26
21,110
1.30
20,980
1.20
21,210
0.92
21,150
1.00
21,090
1.06
21,140
1.03
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,690
17,730
19,910
21,090
21,090
15,690
17,730
19,910
21,110
21,110
15,690
17,730
19,910
20,980
20,980
20,420
21,210
21,210
21,210
21,210
15,690
17,860
19,910
21,150
21,150
15,690
17,730
19,910
21,090
21,090
15,690
17,730
19,910
21,140
21,140
59
(15.0)
TC
CI
20,960
1.43
21,020
1.47
21,030
1.33
21,460
1.01
21,460
1.07
21,470
1.12
21,630
1.06
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,740
14,790
16,970
19,010
20,960
12,740
14,920
16,970
19,140
21,020
12,740
14,920
16,970
19,140
21,030
20,420
21,460
21,460
21,460
21,460
13,000
15,050
17,220
19,270
21,320
13,000
15,050
17,220
19,270
21,320
13,130
15,170
17,350
19,400
21,450
63
(17.2)
TC
CI
20,600
1.64
20,700
1.67
20,890
1.49
21,570
1.11
21,640
1.16
21,750
1.19
22,020
1.11
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,800
9,800
9,930
20,420
21,570
21,570
21,570
21,570
10,180
12,230
14,410
16,580
18,630
10,310
12,360
14,530
16,580
18,630
10,310
12,490
14,660
16,710
18,760
67
(19.4)
11,850
14,020
16,070
18,120
11,850
14,020
16,070
18,250
11,970
14,150
16,200
18,250
TC
CI
19,950
1.87
20,090
1.90
20,520
1.68
21,510
1.22
21,680
1.26
21,880
1.27
22,310
1.16
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,600
8,770
10,820
13,000
15,050
6,720
8,770
10,950
13,000
15,050
6,850
8,900
11,080
13,130
15,300
20,420
21,510
21,510
21,510
21,510
7,240
9,410
11,460
13,640
15,690
7,360
9,410
11,590
13,640
15,690
7,490
9,540
11,720
13,890
15,940
71
(21.7)
TC
CI
19,060
2.11
19,240
2.13
19,940
1.86
21,270
1.34
21,540
1.37
21,860
1.36
22,440
1.21
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
5,700
7,880
9,930
12,100
5,830
8,000
10,050
12,100
6,080
8,130
10,310
12,360
21,270
21,270
21,270
21,270
6,600
8,770
10,820
12,870
6,600
8,770
10,950
13,000
6,850
9,030
11,080
13,130
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.
33
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5-4. Air Throw Distance Charts
Indoor Unit
CS-KS18NKU
Room air temp. : 80°F (26.7°C)
Cooling
Fan speed
:
High
Horizontal distance (ft.)
10 15
0
0
5
20
25
30
5
10
15
: Flap angle 0 ,
: Flap angle 30 ,
: Axis air velocity 0
: Axis air velocity 30
34
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Indoor Unit
CS-KS24NKU
Room air temp. : 80°F (26.7°C)
Cooling
Fan speed
:
High
Horizontal distance (ft.)
10 15
0
0
5
20
25
30
5
10
15
: Flap angle 0 ,
: Flap angle 30 ,
: Axis air velocity 0
: Axis air velocity 30
35
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6. ELECTRICAL DATA
6-1. Electrical Characteristics
Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKU
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Fan Motor + Compressor
230V Single-phase 60Hz
6.7
Complete Unit
Performance at
Rating conditions
Running amp.
A
0.3
32
7.0
Power input
W
1,468
1,500
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.3
32
7.4
7.7
A
1,468
1,500
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Indoor Unit
CS-KS18NKU
Outdoor Unit CU-KS18NKUA
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
230V Single-phase 60Hz
Rating conditions
Running amp.
0.3
32
6.7
7.0
A
Power input
1,468
1,500
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.3
32
7.4
7.7
A
1,468
1,500
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
36
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Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKU
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Fan Motor + Compressor
230V Single-phase 60Hz
10.3
Complete Unit
Performance at
Rating conditions
Running amp.
A
0.5
55
10.8
Power input
W
2,405
2,460
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.5
55
11.6
12.1
A
2,405
2,460
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Indoor Unit
CS-KS24NKU
Outdoor Unit CU-KS24NKUA
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
230V Single-phase 60Hz
Rating conditions
Running amp.
0.5
55
10.3
10.8
A
Power input
2,405
2,460
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.5
55
11.6
12.1
A
2,405
2,460
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB
95 °F (35 °C) DB
37
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6-2. Electric Wiring Diagrams
Indoor Unit
CS-KS18NKU
CS-KS24NKU
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
TERMINAL BASE
EVAPORATOR
BLK
1
2
3
WHT
RED
AC1 AC2 SI
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
1010
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
1010
RED
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
CONNECTOR
1 1
2 2
3 3
4 4
5 5
1 1
RED
PNK
BLU
BRN
YEL
2 2
3 3
4 4
5 5
FLAP
5P (WHT)
FLAP
LAMP
10P (WHT)
FLAP MOTOR
CONTROLLER
ROOM THERMISTOR
1 1
1 1
2 2
3 3
4 4
5 5
6 6
BLK
RED
2 2
3 3
4 4
ROOM/COIL
4P (WHT)
BLK
BLK
BLK
BLK
WHT
YEL
BLU
DCM
6P (BLU)
FM
COIL THERMISTOR
FAN MOTOR
HA
JEM-A
4P (WHT)
1 2 3 4
8FA2-5251-11000-2
38
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Outdoor Unit CU-KS18NKU
CU-KS18NKUA
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
REACTANCE
BLK
WHT
WHT
POWER RELAY
6
1 2
1 2
1
4
5
BLK
w
w
w
w
w
E
TERMINAL
PLATE
L1
L2
E2
E1
FERRITE CORE
w
w
w
U
V
25A
w
BLK
WHT
RED
ACIN1
1
2
w
w
ACIN2
SI-A
CONTROLLER
W
3
GND
4
5
6
BLK
1 2 3
1 2 3
COMP
1 2
A-TH
COIL/OUTDOOR
DCFM
MV0
1 2 3 4 5
1 2 3 4 5
1 2 3 4 1 2 3 4
1 2 3 4 5 6 7
WHT
1 2 1 2 3 4 1 2 3 4
N
L
POWER
SUPPLY
1 2
3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5
1 2 3 4 5
HIGH PRESSURE
SWITCH
BLK
BLK
MV0
S
R
T
1 1
2 2
FM
MAGNETIC COIL
CM
2P-CONNECTOR (BLK)
FAN MOTOR
COMPRESSOR
MOTOR
OVERLOAD RELAY
(OLR)
WHT
WHT
WHT
WHT
1
2
1
2
ELEC SYSTEM ASSY
*
2P-CONNECTOR (RED)
8FA2-5251-12000-2
39
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Outdoor Unit CU-KS24NKU
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
REACTANCE
BLK
WHT
WHT
POWER RELAY
6
1 2
1 2
1
4
5
BLK
w
w
w
w
E
TERMINAL
PLATE
L1
L2
E2
FERRITE CORE
w
w
w
U
V
25A
w
BLK
WHT
RED
ACIN1
ACIN2
1
2
w
w
CONTROLLER
W
3
GND
SI-A
4
5
6
BLK
1 2 3
1 2 3
COMP
1 2
A-TH
COIL/OUTDOOR
DCFM
MV0
1 2 3 4 5
1 2 3 4 5
1 2 3 4 1 2 3 4
1 2 3 4 5 6 7
WHT
1 2 1 2 3 4 1 2 3 4
N
L
POWER
SUPPLY
1 2
3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5
1 2 3 4 5
HIGH PRESSURE
SWITCH
BLK
BLK
MV0
V
U
W
1 1
2 2
FM
MAGNETIC COIL
CM
2P-CONNECTOR (BLK)
FAN MOTOR
COMPRESSOR
MOTOR
OVERLOAD RELAY
(OLR)
WHT
WHT
WHT
WHT
1
2
1
2
ELEC SYSTEM ASSY
*
2P-CONNECTOR (RED)
8FA2-5251-12800-2
40
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Outdoor Unit CU-KS24NKUA
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
REACTANCE
1P-CONNECTOR(WHT)
1 1
BLK
WHT
WHT
POWER RELAY
1P-CONNECTOR(WHT)
1 1
6
1 2
1 2
1
4
5
BLK
w
w
w
w
w
w
E
TERMINAL
PLATE
CRANKCASE
HEATER
HEATER1 HEATER0
L1
L2
E2
FERRITE CORE
w
U
25A
w
BLK
WHT
RED
ACIN1
ACIN2
1
2
w
w
V
w
w
CONTROLLER
W
3
GND
SI-A
4
5
6
BLK
1 2 3
1 2 3
COMP
1 2
A-TH
COIL/OUTDOOR
DCFM
1 2 3 4 5 6 7
MV0
1 2 3 4 5
1 2 3 4 5
1 2 3 4 1 2 3 4
1 2 1 2 3 4 1 2 3 4
WHT
N
L
POWER
SUPPLY
1 2
3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5
1 2 3 4 5
HIGH PRESSURE
SWITCH
BLK
BLK
MV0
V
U
W
1 1
2 2
FM
MAGNETIC COIL
CM
2P-CONNECTOR (BLK)
FAN MOTOR
COMPRESSOR
MOTOR
OVERLOAD RELAY
(OLR)
WHT
WHT
1
2
WHT
WHT
1
2
ELEC SYSTEM ASSY
*
2P-CONNECTOR (RED)
8FA2-5251-12700-2
41
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7. MAINTENANCE
Tab
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.
Fig. 1
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).
ACL button
(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.
Fig. 2
(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)
ON/OFF
operation
button
QUIET
button
Test run mode
Self-diagnostic mode
Address setting mode
1HR.
TIMER
button
(5) "oP-7" has now been selected for address setting.
(6) Press the ON/OFF operation button on the remote
controller. (Fig. 3) Check that the "beep"signal-
received sound is heard from the second indoor
unit (approximately 5 times). The sound you hear
is the signal that the remote controller address
has been changed.
(7) Finally press the remote controller ACL (reset)
button to cancel the blinking "oP-7" display. (Fig.
3)
ACL
(Reset)
button
Changing of the second remote controller address is
now completed.
Fig. 3
42
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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,
push the lock in the direction of "2" while pulling it off.
Pull the cover upward
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.
When the cover is pulled upward, the lock is
released with the sequence of 1 and 2.
43
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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.
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
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.
DRY operation is as shown in the figure below.
Load
COOL zone
A zone
COOL
(GREEN)
STOP
(Lamp Off)
B zone
The set temperature is 4°F(2°C) below the detected room
temperature in the case of cooling operation.
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.
(15°C), or more than 5°F(3°C) below the set
When the monitoring range is entered, the compressor stops,
and the indoor fan operates with 1/f fluctuation.
NOTE
(CLxx models only)
The Sensor Dry operation during the Low Ambient Cooling
Mode (outside air temperature:59°F(15°C) or lower) is as
follows.
DRY A
and
DRY B
The compressor operates a cycle of 3 minutes ON and 6
minutes OFF repeatedly.
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
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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.)
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.
HIGH POWER operation from remote controller
COOL and DRY modes
The unit operates at maximum output for 30 minutes,
regardless of the desired temperature.
The fan speed is 1 step above "High."
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.
Frequency
MAX
2°F(1°C)
Setting
Time
0
temperature
2°F(1°C)
30 min.
5 min.
Press the NIGHT
SETBACK button
30 min.
30 min.
Start
End
Time
NOTE
When HIGH POWER operation ends, the unit operates at low
Hz for 5 minutes, regardless of the thermostat OFF conditions.
When in DRY mode, operation is in the cooling zone.
Lamp colors
OPERATION lamp
DRY operation
COOL operation
FAN operation
Orange
Green
Green
TIMER lamp
QUIET lamp
Green
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
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8-2. Protective Functions
Compressor discharge temperature control
Freeze prevention
This function controls the operation frequency to prevent the
compressor discharge temperature from rising more than a
specified temperature.
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
Compressor discharge temperature °F(°C)
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.
Approx.
A
214
(101)
Approx.
B
201
C
46
(8)
(94)
a
b
c
d
A
B
43
(6)
a. Area: Automatic capacity control.
b. When the temperature rises above Point A, the operation
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
36
(2)
*
a
b
c
d
a. Area: Automatic capacity control
b. When the temperature drops below Point A, the operation
frequency is reduced by a certain proportion.
c. Area: Frequency increase is prohibited.
d. When the temperature reaches Point C or above, freezing
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.
prevention is ended and control is the same as in the
a
area.
* When the temperature drops to below 36°F(2°C)
(continuously for 2 minutes or longer), the compressor stops.
Once the freeze condition is detected, the air conditioner will
work less than the maximum frequency until it is turned off.
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 auto-
matically to control the electrical current for operation.
NOTE
(CLxx models only)
The Freeze Prevention Control during the Low Ambient Cooling
Mode (outside air temperature:59°F(15°C) or lower) is as follows.
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.
When the cause of the increase in electrical current is rectified,
the system will resume operation in the original mode.
< CS-KS18NKU >
(A)
Cooling Dry
17.5
Peak current cut-off trips
Hz down
11.0
< CS-KS24NKU >
(A)
Cooling Dry
22.5
Peak current cut-off trips
Hz down
14.0
46
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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
< Clock display >
Follow the procedure below to perform detailed trouble diagnostics.
Test run mode
Self-diagnostics mode
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
ON/OFF
operation
button
QUIET
button
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.
1HR.
TIMER
button
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.
• 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.
ACL
(Reset)
button
• 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
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(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
OFF
BLINKING
ON
QUIET
(3)
TIMER
(2)
OPERATION
(1)
CODE
S01
DIAGNOSIS CONTENTS
POSSIBLE MALFUNCTION
(1) OPEN OR SHORT CIRCUIT IN SENSOR
ROOM TEMP. SENSOR TROUBLE
(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)
I/D HEAT EXCHANGER
S02
TEMP. SENSOR TROUBLE
HUMIDITY SENSOR TROUBLE
S03
COMPRESSOR TEMP. SENSOR
TROUBLE
S04
S05
(1) OPEN OR SHORT CIRCUIT IN SENSOR
(2) POOR CONTACT AT CONNECTOR OR OPEN CIRCUIT AT
TERMINAL PRESS-FIT LOCATION
O/D HEAT EXCHANGER
TEMP. SENSOR TROUBLE
(3) O/D PCB FAILURE (O/D = OUTDOOR)
O/D AIR TEMP. SENSOR TROUBLE
O/D CURRENT SENSOR ERROR
S06
S07
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
I/D-O/D COMMUNICATION TROUBLE
(SERIAL COMMUNICATION TROUBLE)
E01
E02
(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
HIC CIRCUIT TROUBLE
POWER TR CIRCUIT TROUBLE
(1) EXTERNAL ROM DATA FAILURE (2) O/D PCB FAILURE
O/D UNIT EXTERNAL ROM TROUBLE
CURRENT PEAK CUT
E03
E04
(1) INSTANTANEOUS POWER STOPPAGE (2) HIC OR POWER TR FAILURE
(3) O/D PCB FAILURE
PAM CIRCUIT TROUBLE
(1) O/D PCB FAILURE
(2) O/D POWER VOLTAGE TROUBLE
E05
E06
ACTIVE CIRCUIT 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
COMPRESSOR DISCHARGE TEMP.
OVERHEATING PREVENTION
(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE
(3) I/D PCB FAILURE
I/D FAN OPERATION TROUBLE
E07
E08
(1) 4-WAY VALVE FAILURE (HEAT PUMP MODEL ONLY)
(2) O/D PCB FAILURE
4-WAY VALVE SWITCHING TROUBLE
ZERO-CROSS TROUBLE
(1) SERVICE VALVE NOT OPENED (2) INSUFFICIENT GAS
(1) OPEN PHASE (2) O/D PCB FAILURE
GAS-LOSS PREVENTION
E09
E10
DC COMPRESSOR DRIVE
CIRCUIT TROUBLE
(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE
(3) O/D PCB FAILURE
E11
E12
O/D DC FAN OPERATION TROUBLE
O/D SYSTEM COMM FAILURE,
OLR OPERATION, O/D POWER
OPEN PHASE, O/D FREEZING
(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
FREEZING-PREVENTION OPERATION
E13
8FA2-5251-11100-2
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(2) If the self-diagnostics function fails to operate
No indicators illuminate and the
indoor fan does not rotate.
Check the indoor unit.
Check the power voltage.
Blown
Is the fuse blown?
Normal
Replace the circuit
board or the fuse.
Replace the controller.
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9-3. Checking the Indoor and Outdoor Units
(1) Checking the indoor unit
No.
Control
Check items (unit operation)
• The rated voltage must be present between inter-unit wirings 1 and 2.
1
Use the remote controller to operate the
unit in "TEST run" mode. To determine
whether the mode is currently in
"TEST run" mode, check the 4 indicator
lamps on the unit. If all 4 are blinking,
the current mode is "TEST run."
•
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.
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
No.
Control
Check items (unit operation)
1
Apply the rated voltage between outdoor
unit terminals L and N.
• The control panel LED (red) must illuminate.
2
Short-circuit the outdoor unit COM terminal
to the T-RUN terminal.
• The compressor and fan motor must all turn on.
If there are no problems with the above, then check the indoor unit.
TEST/T-RUN terminals
Using the 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
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(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 Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.
Lamp
Condition
Quiet
Timer
(2)
Operation
(1)
: Off
: Blinking
: Illuminated
(3)
E01
E12
< Before the Operation >
For terminal strip short circuit work or inter-unit wiring removal, turn off the power to
avoid an electric shock.
WARNING
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
specified ones on the specified terminal strip. If such work is performed between
the incorrect terminals, the unit might be broken.
CAUTION
< Convenient Tool for Short-Circuit Work ( for example ) >
Cable
Alligator Clip
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
6. Reactor failure (defective insulation, etc.)
7. High-Pressure Switch failure
3. Blown fuse
8. Overload Relay failure
4. Power Relay failure
5. Outdoor Fan Motor failure (defective insulation, etc.)
9. Magnetic Coil failure (defective insulation, short-circuit, etc.)
10. Compressor failure (defective insulation, etc.)
(3-1) Condition: E01
-
+
Outdoor Unit
V
1
2
3
3
4
5
6
Outdoor Unit
Troubleshooting Serial Communication
1
1
2
3
4
5
6
Power
1
2
Power
Indoor Unit
2
3
V
Indoor Unit
+
-
Fig. 2
Fig. 1
1. Turn OFF the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the indoor unit
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)
No
terminal strip.
(Fig. 2)
3. Turn ON the power.
Yes
A
B
( Continued to the next page B. )
( Continued to the next page A. )
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( Continued from the previous page A. )
A
( Continued from the previous page B. )
B
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)
Yes
No
Defect in the indoor unit
P.C. board
Defect or connection error
in the inter-unit cable
Outdoor Unit
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
1
1
2
2
3
3
4
5
6
Power
unit terminal strip.
(Fig. 3)
Indoor Unit
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.
Condition: E12
Defect in the outdoor unit
P.C. board.
What is the latest self-diagnosis result ?
Condition: E01
Outdoor Unit
Outdoor Unit
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.
1
1
2
3
3
4
5
6
1
2
2
3
4
5
6
Power
Power
3. Disconnect the cable from the terminal 3 on the indoor unit
2
terminal strip.
(Fig. 4)
1
3
Indoor Unit
Fig. 4
Indoor Unit
Fig. 5
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.
Condition: E12
Defect or connection error
in the inter-unit cable
What is the latest self-diagnosis result ?
Condition: E01
Defect in the indoor unit
P.C. board
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(3-2) Condition: E12
Troubleshooting Serial Communication
Outdoor Unit
1
1
2
2
3
3
4
5
6
Power
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
Indoor Unit
unit terminal strip.
(Fig. 6)
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.
Condition: E01
Defect in the outdoor unit
P.C. board
What is the latest self-diagnosis result ?
Condition: E12
Outdoor Unit
1
1
2
3
3
4
5
6
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
Power
2
unit terminal strip.
(Fig. 7)
Indoor Unit
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.
Condition: E01
Defect in the inter-unit
cable
What is the latest self-diagnosis result ?
Condition: E12
Defect in the indoor unit
P.C. board
53
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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:
(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.
[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)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor
unit controller (3 locations).
Measurement location
Normal value
DC 230 V or more
DC 14 V or more
(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
Fluctuation between DC 1.7 to 6.1 V
(Diagnostic results)
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 .)
(Reference)
DC motor connector pin arrangement
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Gnd (black)
Pin 4: Vcc (white)
Pin 5: Vs (yellow)
Pin 6: PG (blue)
[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
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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:
(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.
[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)
* 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
Normal value
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.
(Diagnostic results)
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
(Replace the controller .)
(Reference)
DC motor connector pin arrangement
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)
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)
[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.
55
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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
Trouble
Correction
1. Locations near broadcast stations where
there are strong electromagnetic waves
Either of the following trouble may occur.
(The fundamental concept is to make the
system less susceptible to noise.)
1. The unit may stop suddenly during
operation.
2. Locations near amateur radio (short wave)
stations
- Insulate for noise or
distance from the noise source. -
2. Indicator lamps may flicker.
3. Locations near electronic sewing machines
and arc-welding machines
1. Use shielded wires.
2. Move unit away from the noise source.
(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
Trouble
Correction
1. A television or radio is located near the
A/C and A/C wiring.
1. Noise appears in the television picture, 1. Select a separate power source.
or the picture is distorted.
2. Keep the A/C and A/C wiring at least 1 meter
2. The antenna cable for a television or
radio is located close to the A/C and A/C
wiring.
2. Static occurs in the radio sound.
away from wireless devices and antenna cables.
3. Change the wireless device’s antenna to a high-
sensitivity antenna.
3. Locations where television and radio
signals are weak.
4. Change the antenna cable to a BS coaxial cable.
5. Use a noise filter (for the wireless device).
6. Use a signal booster.
56
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10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation
Ground wire
Resistance
Clip
The insulation is in good condition if the resistance
exceeds 1M ohm.
Probe
10-1-1. Power Supply Cord
Insulation
tester
Clamp the grounding wire of power cord with the lead
Fig. 1
clip of the insulation resistance tester and measure the
resistance by placing a probe on either of the two
power wires. (Fig. 1)
Terminal plate
Then also measure the resistance between the
grounding and other power terminals. (Fig. 1)
Probe
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.
Clip
Copper
tube or
Insulation
tester
metallic part
10-1-3. Outdoor Unit
Fig. 2
Clamp a metallic part of the unit with the lead clip of
the insulation resistance tester and measure the
resistance by placing a probe on each terminal screw
where power supply lines are connected on the
terminal plate. (Fig. 2)
Probe
Clip
10-1-4. Measurement of Insulation
Resistance for Electrical Parts
Copper
tube or
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)
metallic part
Insulation
tester
Fig. 3
NOTE
From fan motor,
compressor and
other parts
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.
Probe
Metallic
part
Clip
Insulation
tester
Fig. 4
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10-2. Checking Continuity of Fuse
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.
PCB Ass'y
Fig. 5
Fuse
Fig. 6
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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.
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
CAUTION
faster replacement work compared with conventional models are required.
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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.
Specification A
Diameter of tube D
Flare tool for R410A
Conventional flare tool (for R22)
Dia.1/4" (6.35 mm)
Dia.3/8" (9.52 mm)
Dia.1/2" (12.7 mm)
Dia.5/8" (15.88 mm)
0 to 0.0196"
0.0472"
(0 to 0.5 mm)
(1.2 mm)
Size of flare
Spacer
D
D
A
A
Flare tool for R410A
Conventional flare tool (R22)
Tubing precautions
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.
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11-3. Tools Specifically for R410A
For servicing, use the following tools for R410A
Tool Distinction
Gauge manifold
Tool Name
Charging hose
Gas leak detector
Refrigerant cylinder
Charging cylinder
Refrigerant recovery unit
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
Tools specifically for R410A
Bender
Tools which can be com-
monly used for R22,
R407C, and R410A
Torque wrench
Cutter, reamer
Welding tool, nitrogen gas cylinder
The above tools specifically for R410A must not be used for R22 and R407C.
Doing so will cause malfunction of the unit.
CAUTION
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.
To prevent other refrigerants (R22, R407C) from being mistakenly charged to this unit, shape and external
diameter of the service port screw has been altered.
<External diameter of service port> R410A : 5/16"
R22, R407C : 1/4"
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.
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11-5. In Case of Compressor Malfunction
Should the compressor malfunction, be sure to make the switch to a replacement
compressor as quickly as possible.
CAUTION
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.
(1) Recover refrigerant
OK
Do not reuse the recovered refrigerant, since it will contain
impurities.
(2) Replacing Compressor
(2) Replace compressor
OK
Soon after removing seals of both discharge and suction
tubes of the new compressor, replace it quickly.
(3) Checking for sealing
Use nitrogen gas for the pressurized gas, and never use a
refrigerant other than R410A. Also do not use oxygen or
any flammable gas.
(3) Check for sealing
OK
(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.
(4) Evacuation
OK
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.
(5) Recharge
Standard time for evacuation
Length of tubing
Less than 33 ft. (10 m)
More than 33 ft. (10 m)
Evacuation time
More than 10 minutes
More than 15 minutes
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(5) Recharging
Be sure to charge the specified amount of
Configuration and characteristics of cylinders
Valve
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.
Liquid
Never charge a large amount
CAUTION
of liquid refrigerant at once to
the unit. This may cause
damage to the compressor.
Single valve
Charge liquid refrigerant with
cylinder in up-side-down position.
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%.
Fig. 1
Valve
Also, charge the minimum necessary amount to
the charging cylinder before using it to charge
the air conditioning unit.
Example:
Liquid
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:
Single valve (with siphon tube)
Charge with cylinder in normal position.
1.68 + 22 0.20 = 6.08 lb.
(0.76 + 10 0.20 = 2.76 Kg)
Fig. 2
For the remaining refrigerant, refer to the
instructions of the refrigerant manufacturer.
NO!
If using a charging cylinder, transfer the specified
amount of liquid refrigerant from the refrigerant
cylinder to the charging cylinder.
Charging
cylinder
Prepare an evacuated charging cylinder
beforehand.
To prevent the composition
CAUTION
of R410A from changing,
never bleed the refrigerant
gas into the atmosphere
while transferring the
refrigerant. (Fig. 3)
Liquid
Open
Refrigerant
cylinder
Do not use the refrigerant if the amount in the
charging cylinder is less than 20%.
Fig. 3
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11-6. In Case Refrigerant is Leaking
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
CAUTION
carry out repairs, then recharge the refrigerant.
(1) Detecting Leaks
Use the detector for R410A to locate refrigerant leak
points.
(1) Detect leaks
(2) Recovering refrigerant
Never release the gas to the atmosphere; recover
OK
residual refrigerant using the refrigerant recovery unit for
R410A, instead.
(2) Recover refrigerant
Do not reuse the recovered refrigerant because its
composition will have been altered.
OK
(3) Welding leaking points
Confirm again that no residual refrigerant exists in the unit
before starting welding.
(3) Weld leaking points
OK
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.
(4) Checking for sealing
(4) Check for sealing
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.
(5) Evacuation
(5) Evacuation
OK
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.
(6) Recharge
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
Less than 33 ft. (10 m)
More than 33 ft. (10 m)
Evacuation time
More than 10 minutes
More than 15 minutes
(6) Recharging
Recharge unit in the same manner explained on the
previous page "(5) Recharging."
64
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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.
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
CAUTION
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
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APPENDIX A Operating Instructions
CS-KS18NKU + CU-KS18NKU
+ CU-KS18NKUA
CS-KS24NKU + CU-KS24NKU
+ CU-KS24NKUA
(852-6-4181-210-00-1)
A-1
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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
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FEATURES
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
•
Air Sweep Control
The interior compartment of the remote controller
contains several features to facilitate automatic operation,
easy logically displayed for easy use.
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.
•
•
•
•
•
Simple One-touch Remote Controller
The remote controller has several features to facilitate
automatic operation.
•
•
•
Auto. Flap Control
This automatically sets the flap to the optimum position
during heating, cooling, and drying 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.
Automatic Restart Function for Power Failure
Even when power failure occurs, preset programmed
operation can be reactivated once power resumes.
1-Hour OFF Timer
This timer can be set to automatically turn off the unit at
any time after one hour.
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”.
Night Setback
This function saves energy by controlling operation to
provide a quieter operating sound than normal.
•
Quiet Operation
The fan rotates slower than the fan speed setting to
provide a quieter operating sound.
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
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
SAFETY PRECAUTIONS
The following symbols used in this manual, alert you
to potentially dangerous conditions to users, service
personnel or the appliance:
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.
This symbol refers to a hazard or
unsafe practice which can result in
severe personal injury or death.
Model No. __________________________________
Serial No. ___________________________________
Date of purchase _____________________________
Dealer’s address _____________________________
Phone number _______________________________
This symbol refers to a hazard or
unsafe practice which can result in
CAUTION
personal injury or product or property
damage.
2
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INSTALLATION LOCATION
•
We recommend that this air conditioner be installed properly by qualified
installation technicians in accordance with the Installation Instructions
provided with the unit.
•
Before installation, check that the voltage of the electric supply in your home or
office is the same as the voltage shown on the nameplate.
•
•
Do not install this air conditioner where there are fumes or flammable
gases, or in an extremely humid space such as a greenhouse.
Do not install the air conditioner where excessively high heat-
generating objects are placed.
Avoid: To protect the air conditioner from heavy corrosion, avoid installing the outdoor
unit where salty sea water can splash directly onto it or in sulphurous air near a
spa.
ELECTRICAL REQUIREMENTS
1. All wiring must conform to the local electrical codes. Consult your dealer or a
qualified electrician for details.
2. Each unit must be properly grounded with a ground (or earth) wire or through
the supply wiring.
3. Wiring must be done by a qualified electrician.
Pull off the power plug from a receptacle, or switch off the breaker, or switch off
NOTE
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
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•
•
•
To prevent possible hazards from insulation failure, the unit must
be grounded.
Do not clean inside the indoor and outdoor units by users. Engage
authorized dealer or specialist for cleaning.
In case of malfunction of this appliance, do not repair by yourself.
Contact to the sales dealer or service dealer for a repair.
Refrigerant gas leakage may cause fire.
For safety, be sure to turn the air conditioner off and also to
disconnect the power before cleaning.
•
•
•
Pull off the power plug from a receptacle, or switch off the breaker, or
switch off the power disconnecting mean to isolate the air conditioner
from the main power supply in case of emergency.
•
•
•
Do not turn the air conditioner on and off from the power mains switch.
Use the ON/OFF operation button.
CAUTION
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.
NOTICE
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.
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NAMES OF PARTS
Air Intakes
INDOOR UNIT
Air Outlet
Remote Controller
Drain Hose
Refrigerant Tubes
OUTDOOR UNIT
Air Outlet
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.
NOTE
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
refrigerant gas flows.
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
other electrical components.
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UNIT DISPLAY AND OPERATION BUTTON
INDOOR UNIT
IMPORTANT
OPERATION lamp
TIMER lamp
QUIET lamp
Avoid using radio equipment
such as mobile phone near
(within 4 ft (1.2m).) the remote
control receiver. Some radio
equipment may cause
QUIET
OPERATION button
malfunction of the unit.
If the trouble happens,
disconnect power and restart
the air conditioner after a few
minutes.
REMOTE CONTROL receiver
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.
Each time this button is pressed, the operation mode changes cyclically.
Cooling operation
Stop
OPERATION lamp This lamp lights when the system is in the continuous DRY (orange), COOL
(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.
NOTE
6
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REMOTE CONTROLLER (DISPLAY)
Displayed when transmitting data
Displayed when indoor unit sensor
is in use
Displayed when setting
temperature
Displayed when temperature is
shown
Displayed when setting timer
Displayed when the
time display is set to
12-hour time.
Symbols
(1) Operation mode
(4) Timer
24-hour clock with ON/OFF
MILD DRY ..............................
COOL.....................................
FAN ........................................
program Timer........................
ON Timer................................
OFF Timer..............................
1-hour OFF Timer...................
(2) Fan speed
Automatic operation ...............
(5) NIGHT SETBACK ..................
HIGH .....................................
MEDIUM.................................
LOW.......................................
(6) Confirmation of
transmission...........................
(7) Auto. fla.dication.....................
Flap angle indication ..............
Sweep indication....................
(8) High power operation.............
(9) Quiet operation.......................
(3) Temperature setting
60 – 86 °F
When set to 80 °F
temperature indication............
7
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REMOTE CONTROLLER
Sensor
Transmitter
(Cover closed)
ON/OFF operation button
Display
QUIET button
1 HR. TIMER button
Temperature setting buttons (TEMP.)
MODE selector button
NIGHT SETBACK button
HIGH POWER button
FAN SPEED selector button
FLAP button
ON TIME
setting
buttons
Advance button
Return button
OFF TIME
setting
buttons
Advance button
Return button
CLOCK button
CANCEL button
SENSOR button
Time display selector button
ACL button
ADDRESS switch
Temperature display
selector button
The illustration above pictures the remote controller after the cover has been
opened.
NOTE
Transmitter When you press the buttons on the remote controller, the
mark appears in the
display to transmit the setting changes to the receiver in the air conditioner.
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.
8
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REMOTE CONTROLLER (CONTINUED)
Temperature setting buttons Press the
(TEMP.) Press the
button to increase the set temperature.
button to reduce the set temperature.
The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.
buttons is pressed.
MODE selector button Use this button to select DRY, COOL or FAN mode.
(DRY)
(COOL)
(FAN)
: The air conditioner reduces the humidity in the room.
: The air conditioner makes the room cooler.
: The air conditioner works only as a circulation fan.
FAN SPEED selector button
: The air conditioner automatically decides the fan speeds.
: High fan speed
: Medium fan speed
: Low fan speed
NIGHT SETBACK button For details, see “4. Night Setback Mode”. When you press this button in the DRY
or COOL mode, the mark appears in the display, and the remote controller will
automatically adjust the set temperature to save energy.
FLAP button Press this button either to select the setting of the airflow direction to the auto.
flap in each mode or one of the six possible positions manually or to select the
sweep function which moves the flap up and down automatically.
: Auto flap setting: If selected in a cooling or dry operation, the flap is set at
position (7) in the following chart.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.
When you press the FLAP button, the air flow direction will be changed one by
one as follows.
NOTE
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 No display: The timer does not operate.
buttons
: 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”.
SENSOR button When you press this button (use a small-tipped object such as a ballpoint pen),
the mark will appear at the display. And the room temperature is detected by
the sensor which is built into the indoor unit and the air conditioner is controlled
accordingly.
If the remote controller is located near a heat source, such as a space heater or in direct
sunlight, press the SENSOR button to switch to the sensor on the indoor unit.
NOTE
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.
NOTE
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REMOTE CONTROLLER (CONTINUED)
Temperature Display Selector button This switches the temperature display between °C and °F.
Time Display Selector button This switches the time display between 24-hour time and 12-hour time.
ACL button (ALL CLEAR) Puts the remote controller into pre-operation status. Always press this button
after replacing the batteries.
ADDRESS switch
•
The address switch changes to prevent mixing of signals from remote
controller’s when two air conditioners are installed next to each other.
Normally, the address switch is set to A. For more information, please contact
the dealer where you made the purchase.
•
Normally, the tabs on the remote controller should not be bent.
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.
NOTE
USING THE REMOTE CONTROLLER
How to Install Batteries
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
•
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.
CAUTION
•
•
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.
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.
Pb
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USING THE REMOTE CONTROLLER (CONTINUED)
How to Use the Remote When using the remote controller, always point the unit’s transmitter head directly
Controller at the air conditioner’s receiver.
Air Conditioner
(Indoor unit)
Receiver
Remote Controller
(Transmitter head)
Remote Controller Installation The remote controller may be operated either from a non-fixed position or from a
Position 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 Before mounting the remote controller, press the ON/OFF operation button at the
Controller 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.
Remote Control
Holder
Rear Side
Press
Mounting Screws
5/32 x 5/8" (4 x 16 mm)
(included)
Set in
place
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.
To take out the remote controller, pull it forward.
When Holding the Remote
Controller
•
When using the remote controller and during air conditioner operation, the
transmitter on the remote controller should be pointed towards the receiver on
the indoor unit.
•
Make sure that there are no objects between the remote controller and
receiver which could block the signal.
11
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OPERATION WITH THE REMOTE CONTROLLER
1. Operation
STEP 2
STEP 3
STEP 1
STEP 4
STEP 5
Check that the circuit breaker on the power panel is turned on.
NOTE
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
For cooling operation
For fan only operation
o
o
o
STEP 2
STEP 3
To start the air conditioner, press the ON/OFF operation button.
Press the TEMP. setting buttons to change the temperature
setting to the desired temperature.
Adjustable temperature range:
30 °C max.
16 °C min.
or
86 °F max.
60 °F min.
STEP 4
STEP 5
Set the FAN SPEED selector button to the setting you want.
Press the FLAP button and set the airflow direction as desired.
(Refer to “ADJUSTING THE AIRFLOW DIRECTION” on
page 20.)
To stop the air conditioner, press the ON/OFF operation button again.
12
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OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
•
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.
NOTE
•
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
3. Fan Only
If you want to adjust fan speed manually during operation, just set the FAN
SPEED selector button as desired. [
,
, or
]
STEP 2
STEP 1
STEP 3
If you want to circulate air without any temperature control, follow these steps:
STEP 1
STEP 2
STEP 3
Press the MODE selector button to switch to the fan mode
Press the ON/OFF operation button.
.
Press the FAN SPEED selector button to select the fan speed of
your choice ( or ).
,
13
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OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
4. Night Setback Mode
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.
NOTE
Pressing the MODE selector button cancels Night Setback mode.
In Cooling and DRY
Mode: ( and
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.
)
2 °F
Setting
temperature
2 °F
30 min.
30 min.
Press the NIGHT
SETBACK button
Time
14
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OPERATION WITH THE REMOTE CONTROLLER (CONTINUED)
5. QUIET 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.
6. HIGH POWER Mode
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.
NOTE
• Depending on the operating conditions, the fan speed may be
increased by a small amount only.
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SPECIAL REMARKS
‘‘DRY’’ ( ) Operation
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.
Cooling ( ) Operation
•
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.
Power failure during
operation
Clicking Sound
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.
Remote Controller
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SETTING THE TIMER
In the descriptions below, the following settings are used for the temperature and
time indicator selector button on the bottom front section of the remote controller.
NOTE
•
•
Temperature: °F
Time: AM, PM
(Example) To set to 10:30 pm.
1. How to set the present
time
Operation
Indication
1. Press the CLOCK button once if
The time indication alone flashes.
the time indicator is not flashing.
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.
(Example) To stop the air conditioner at 11:00 am.
2. How to set the OFF time
Operation
Indication
1. Press the OFF TIME setting
The timer
indication is displayed,
button once.
and the present OFF time is shown.
2. Press the Advance, Return ( ,
) button until AM 11:00 is
displayed.
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 The timer
indication stops
setting is complete.
blinking and the present time is
displayed.
17
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SETTING THE TIMER (CONTINUED)
(Example) To start operation at 7:10 am.
3. How to set the ON time
Operation
Indication
1. Press the ON TIME setting
The timer
indication is displayed,
button once.
and the present ON time is shown.
2. Press the Advance, Return ( ,
) button until AM 7:10 is
displayed.
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 timer
indication stops
the setting is complete.
blinking and the present time is
displayed.
(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00 am.
4. How to set DAILY ON/OFF
REPEAT timer
10:30 pm.
Present time
7:10 am.
ON
11:00 am.
OFF
Operation
Indication
1. Set the timer ON/OFF times as
The present time 10:30 pm. and
are displayed.
shown in 2-1, 2, 3 and 3-1, 2, 3.
•
The ON/OFF combination timer uses the current time as the
reference, and it is activated starting from whichever set time
comes first.
NOTE
•
•
With the ON/OFF combination timer, the settings are repeated
every day.
You can check the timer ON/OFF times after you have set them
by pressing the ON TIME and OFF TIME setting buttons.
To cancel a timer program
•
•
Press the CANCEL button.
When either an ON or OFF timer is to be canceled, press the button
corresponding to the timer whose program is to be canceled, and then press
the CANCEL button.
•
•
The airflow direction, fan speed and temperature setting can be changed after
a timer program has been set even when the unit is stopped. Even when
operation is stopped during an ON timer program, the unit will start operating
when the set time is reached provided that the program is not canceled.
When the ON timer and OFF timer are set to the same time, the timer
operates as if it is turned off.
NOTE
18
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USING THE 1-HOUR OFF TIMER
1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,
regardless of whether the unit is on or off when this button is pressed.
The
indicator in the display indicates that this function is operating.
Setting procedure:
Regardless of whether the unit is operating or stopped, press the 1 HR. TIMER
button.
appears in the display.
Cancellation procedure:
Press the ON/OFF operation button to turn the unit off, wait for the unit to stop
operating, and then press the ON/OFF operation button again.
The 1-Hour Timer function is now cancelled and the unit operates normally.
•
•
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.
NOTE
2. Operation together with the The 1-Hour OFF Timer setting is given priority over the DAILY ON/OFF REPEAT
DAILY ON/OFF REPEAT Timer setting.
TIPS FOR ENERGY SAVING
Avoid
Do
•
Do not block neither the air intake nor the air outlet. It may cause less
performance, and may leads to malfunctions.
Do not let direct sunlight into the room. Use sunshades, blinds or curtains. If
the walls and ceiling of the room are warmed by the sun, it will take longer to
cool the room.
•
•
•
Always try to keep the air filter clean. (Refer to “CARE AND CLEANING”.) A
clogged filter will impair the performance of the unit.
To prevent conditioned air from escaping, keep windows, doors and any other
openings closed.
19
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ADJUSTING THE AIRFLOW DIRECTION
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
CAUTION
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.
COOL
SWEEP
DRY
FAN
A. Sweep function
B. Setting the airflow manually
Referring to the above illustration, use the
The flap starts moving up and down to
deliver air over the sweep range.
FLAP button to set the airflow direction
within the range used during the cooling or
dehumidifying operation.
C. Auto flap function
The flap is set to the recommended
position.
•
The flap automatically closes when the unit is off.
NOTE
•
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.
CAUTION
•
Condensation may begin to form around the air vent and drip down.
20
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OPERATION WITHOUT THE REMOTE CONTROLLER
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
OPERATION button
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.
NOTE
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.
CAUTION
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
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CARE AND CLEANING (CONTINUED)
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
Air intake grille
intake grille, and remove it by
opening towards the front and
pulling towards you.
2. Remove the filter attached to
filter
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
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.
FRONT mark
Hook
Groove
Pin
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.
Air intake grille
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.
Air intake grille
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.
NOTE
22
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CARE AND CLEANING (CONTINUED)
Cleaning the main unit and
Remote Controller
•
•
Wipe clean using a soft, dry cloth.
To remove stubborn dirt, moisten a cloth in warm water no hotter than 104 °F,
wring thoroughly, and then wipe.
•
The air intake grille can be removed in order to wash it with water.
Removing and remounting the Refer to “How to remove the filter” and “How to replace the filter” on page 22.
air intake grille
When using a footstool or the like, be careful not to let it tip over.
CAUTION
Washing the grille with water
•
•
Clean the grille gently using a soft sponge, or the like. Then wipe away any
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
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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
1. Power failure.
Remedy
1. Restore power.
Air conditioner does not run at all.
2. Leakage circuit breaker tripped.
2. Contact service center.
3. Consult your electrician or dealer.
4. Replace batteries.
3. Line voltage is too low.
4. Batteries in remote controller have
run down.
OPERATION lamp blinks and air
conditioner does not operate.
Trouble in system.
Contact service center.
Remove obstruction.
Compressor runs but soon stops.
Obstruction in front of condenser coil.
(Outdoor Unit)
Poor cooling performance.
1. Dirty or clogged air filter.
1. Clean air filter to improve airflow.
2. Eliminate heat source if possible.
3. Shut them to keep the heat out.
4. Remove it to ensure good airflow.
2. Heat source or many people in room.
3. Doors and/or windows are open.
4. Obstacle near air intake or air
discharge port.
5. Thermostat is set too high for cooling. 5. Set the temperature lower.
Clicking sound is heard from the air
conditioner.
In cooling operation, any plastic parts
may shrink due to a sudden
This is normal, and the sound will soon
disappear.
temperature change. In this event, a
clicking sound may occur.
OPERATION lamp lights but outdoor
unit will not run.
The use of cellular phones near the air 1. Turn off the power then restart the air
conditioner may cause disturbance to its
normal operation.
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.
Min.
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
115 °F DB
67 °F DB
For Low Ambient Cooling Models : CU-KS18NKUA, CU-KS24NKUA
Temperature
Indoor air temperature
Outdoor air temperature
COOLING
Max.
Min.
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
115 °F DB
0 °F DB
24
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SPECIFICATIONS
Outdoor Unit
CU-KS18NKU, CU-KS18NKUA
Indoor Unit
CS-KS18NKU
Model No.
Power Source
Single-phase, 208-230 V, 60 Hz
5.15 [ 1.20 ~ 5.15 ]
17,500 [ 4,000 ~ 17,500 ]
kW
BTU/h
kW
Cooling Capacity
-
-
Heating Capacity
Cooling
BTU/h
Outdoor (Hi)
Indoor(H/M/L)
Outdoor (Hi)
Indoor(H/M/L)
51
-
-
-
dB(A)
Operation
Operation
42/38/30
Sound
-
-
Heating
dB(A)
Operation
-
Unit Dimensions (H×W×D)
(Indoor unit : Include panel)
26-3/8×34-21/32×11-7/32
(670×880×285)
11-23/32×41-15/16×8-5/8
(298×1,065×219)
inch(mm)
lbs.(kg)
Net Weight
90.4(41.0)
26.5(12.0)
Outdoor Unit
CU-KS24NKU, CU-KS24NKUA
Indoor Unit
CS-KS24NKU
Model No.
Power Source
Single-phase, 208-230 V, 60 Hz
7.10 [ 1.20 ~ 7.10 ]
24,200 [ 4,000 ~ 24,200 ]
kW
BTU/h
kW
Cooling Capacity
-
-
Heating Capacity
BTU/h
Cooling
Operation
Outdoor (Hi)
Indoor(H/M/L)
Outdoor (Hi)
Indoor(H/M/L)
55
-
-
-
dB(A)
Operation
Sound
47/44/41
-
-
Heating
Operation
dB(A)
-
Unit Dimensions (H×W×D)
(Indoor unit : Include panel)
29-1/8×35-7/16×12-19/32
(740×900×320)
11-23/32×41-15/16×8-5/8
(298×1,065×219)
inch(mm)
lbs.(kg)
Net Weight
119.0(54.0)
26.5(12.0)
25
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APPENDIX B INSTALLATION INSTRCTIONS
CS-KS18NKU + CU-KS18NKU
+ CU-KS18NKUA
CS-KS24NKU + CU-KS24NKU
+ CU-KS24NKUA
(852-6-4190-576-00-0)
A-2
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INSTALLATION INSTRUCTIONS
Split System Air Conditioner
This air conditioner uses the refrigerant R410A.
Contents
Page
NOTE
External diameter of service port R410A: 5/16"
IMPORTANT!
Please Read Before Starting .................................. 2
Model Combinations
1. GENERAL .......................................................... 4
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
Combine indoor and outdoor units only as listed
below.
1-3. Optional Copper Tubing Kit
Model No.
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation
Indoor Unit
Outdoor Unit
CS-KS18NKU
CU-KS18NKU
CU-KS18NKUA
CU-KS24NKU
CU-KS24NKUA
2. INSTALLATION SITE SELECTION ................... 5
2-1. Indoor Unit
2-2. Outdoor Unit
CS-KS24NKU
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
Power Source:
60 Hz, single-phase, 230/208 V
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
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When Transporting
IMPORTANT!
Please Read Before Starting
Be careful when picking up and moving the indoor and out-
door units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin alu-
minum fins on the air conditioner can cut your fingers.
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 Installing…
Select an installation location which is rigid and strong
enough to support or hold the unit, and select a location for
easy maintenance.
For safe installation and trouble-free operation, you
must:
ꢁ
Carefully read this instruction booklet before beginning.
…In a Ceiling or Wall
ꢁ
Follow each installation or repair step exactly as shown.
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.
ꢁ
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
result in severe personal injury
or death.
…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.
WARNING
This symbol refers to a hazard
or unsafe practice which can
result in personal injury or prod-
uct or property damage.
Keep the fire alarm and the air
outlet at least 1.5 m away from
the unit.
CAUTION
CAUTION
If Necessary, Get Help
…In Moist or Uneven Locations
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.
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
In Case of Improper Installation
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.
The manufacturer shall in no way be responsible for improp-
er installation or maintenance service, including failure to
follow the instructions in this document.
…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.
SPECIAL PRECAUTIONS
When Connecting Refrigerant Tubing
WARNING
When Wiring
‡ :KHQꢀSHUIRUPLQJꢀpiping work
do not mix air except for speci-
fied refrigerant (R410A) in
refrigeration cycle. It causes
capacity down, and risk of
explosion and injury due to
high tension inside the refrige-
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.
‡ 'RꢀQRWꢀVXSSO\ꢀSRZHUꢀWRꢀWKHꢀXQLWꢀXQWLOꢀDOOꢀZLULQJꢀDQGꢀWXELQJ
are completed or reconnected and checked.
‡ +LJKO\ꢀGDQJHURXVꢀHOHFWULFDOꢀYROWDJHVꢀDUHꢀXVHGꢀLQꢀWKLV
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or
death.
rant cycle.
WARNING
‡ 5HIULJHUDQWꢀJDVꢀOHDNDJHꢀPD\
cause fire.
‡ *URXQGꢀWKHꢀXQLW following local electrical codes.
‡ &RQQHFWꢀDOOꢀZLULQJꢀWLJKWO\ꢁꢀ/RRVHꢀZLULQJꢀPD\ꢀFDXVHꢀRYHUꢂ
heating at connection points and a possible fire hazard.
‡ 7RꢀSUHYHQWꢀSRVVLEOHꢀKD]DUGVꢀIURPꢀLQVXODWLRQꢀIDLOXUHꢃ
the unit must be grounded.
‡ 'RꢀQRWꢀDGGꢀRUꢀUHSODFHꢀUHIULJHUDQW
other than specified type.
It may cause product damage,
burst and injury etc.
‡ 9HQWLODWHꢀWKHꢀURRPꢀZHOOꢃꢀLQꢀWKHꢀHYHQWꢀWKDWꢀUHIULJHUDQWꢀ
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
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‡ 8VHꢀWKHꢀIODUHꢀPHWKRGꢀIRUꢀFRQQHFWLQJꢀWXELQJꢁ
Others
‡ $SSO\ꢀUHIULJHUDQWꢀOXEULFDQWꢀWRꢀWKHꢀPDWFKLQJꢀVXUIDFHVꢀRI
the flare and union tubes before connecting them,
then tighten the nut with a torque wrench for a leak-
free connection.
CAUTION
‡ &KHFNꢀFDUHIXOO\ꢀIRUꢀOHDNVꢀEHIRUHꢀVWDUWLQJꢀWKHꢀWHVWꢀUXQꢁ
‡ 9HQWLODWHꢀDQ\ꢀHQFORVHGꢀDUHDVꢀZKHQꢀLQVWDOOLQJꢀRUꢀWHVWLQJ
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.
‡ 'RꢀQRWꢀOHDNꢀUHIULJHUDQWꢀZKLOHꢀSLSLQJꢀZRUNꢀIRUꢀDQꢀLQVWDOODWLRQ
or re-installation, and while repairing refrigeration parts.
Handle liquid refrigerant carefully as it may cause frost-
bite.
‡ &RQILUPꢀXSRQꢀFRPSOHWLQJꢀLQVWDOODWLRQꢀWKDWꢀQRꢀUHIULJHUDQW
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.
When Servicing
‡ 7XUQꢀWKHꢀSRZHUꢀ2)) DWꢀWKHꢀPDLQꢀSRZHUꢀER[ꢀꢄPDLQVꢅ
before opening the unit to check or repair electrical
parts and wiring.
‡ 'RꢀQRWꢀWRXFKꢀWKHꢀDLUꢀLQOHWꢀRUꢀWKHꢀVKDUSꢀDOXPLQXPꢀ
fins of the outdoor unit. You may get injured.
‡ 'RꢀQRWꢀVLWꢀRUꢀVWHSꢀRQꢀWKHꢀXQLWꢃꢀ\RXꢀPD\ꢀIDOOꢀGRZQ
‡ .HHSꢀ\RXUꢀILQJHUVꢀDQGꢀFORWKLQJꢀDZD\ꢀIURPꢀDQ\ꢀPRYLQJ
accidentally.
parts.
‡ 'RꢀQRWꢀVWLFNꢀDQ\ꢀREMHFWꢀLQWRꢀWKHꢀ)$1ꢀ&$6(ꢁ
‡ &OHDQꢀXSꢀWKHꢀVLWHꢀDIWHUꢀ\RXꢀILQLVKꢃꢀUHPHPEHULQJꢀWRꢀFKHFN
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
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
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1. General
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
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.
11. Tube cutter
1-1. Tools Required for Installation (not supplied)
1. Standard screwdriver
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
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
Parts
Clamp
Figure
Q’ty
Truss-head
Remote
Tapping screw
5Phillips
1
10
1
controller
/32 x 5/8" (4x16 mm)
Cushion
Remote control
holder
1
2
8
1
4
Rawl plug
rubber*
*Packed in the outdoor unit.
Drain hose
adapter
AAA alkaline
battery
1-3. Optional Copper Tubing Kit
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).
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.
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.
1-4. Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately from
a local source, you will need:
Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.
CAUTION
1. Deoxidized annealed copper tube for refrigerant tub-
ing 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
Narrow Tube
Model
Wide Tube
Outer Dia. Thickness
Outer Dia.
Thickness
CS-KS18NKU
CS-KS24NKU
1/4" (6.35 mm)
1/4" (6.35 mm)
0.0314" (0.8 mm) 1/2" (12.70 mm) 0.0314" (0.8 mm)
0.0314" (0.8 mm) 5/8" (15.88 mm) 0.0393" (1.0 mm)
4
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Indoor unit
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
Drain hose
2. Installation Site Selection
Outside drainage
2-1. Indoor Unit
Fig. 1
To prevent abnormal heat genera-
WARNING
tion and the possibility of fire, do
not place obstacles, enclosures
and grilles in front of or surround-
ing the air conditioner in a way
6" (15 cm)
min.
2" (5 cm)
min.
2" (5 cm)
min.
that may block air flow.
AVOID:
Front View
ꢁ direct sunlight.
Fig. 2
ꢁ 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.
Tubing length (L)
INDOOR
UNIT
DO:
ꢁ select an appropriate position from which every corner of
Elevation
difference (H)
OUTDOOR
UNIT
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
Fig. 3a
shortest run to the outside. (Fig. 1)
ꢁ allow room for operation and maintenance as well as unre-
CAUTION
stricted air flow around the unit. (Fig. 2)
Indoor unit
ꢁ 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.
Wall
For stable operation of the
air conditioner, do not
install wall-mounted type
indoor units less than 5'
(1.5 m) from floor level.
ꢁ install the indoor unit more than 3.3' (1 m) away from any
antenna or power lines or connecting wires used for television,
radio, telephone, security system, or intercom. Electrical noise
from any of these sources may affect operation.
Minimum height
from floor level
5' (1.5 m)
Floor level
Table 3
Fig. 3b
Max. Allowable Tubing
Length at Shipment
(ft.)
Limit of Tubing
Length (L)
(ft.)
Limit of Elevation
Difference (H)
(ft.)
Required Amount of
Additional Refrigerant
Model
(oz./ft.)*
CS-KS18NKU
CS-KS24NKU
25
100
50
0.27
CU-KS24NKU CU-KS24NKUA
33
50
0.27
132
100
* 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.
5
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2-2. Outdoor Unit
AVOID:
Exhaust fan
NO
Hot air
ꢁ heat sources, exhaust fans, etc. (Fig. 4)
ꢁ damp, humid or uneven locations.
Heat source
DO:
Outdoor unit
ꢁ 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.
Fig. 4
Obstacle above
Min.
(CU-KS18NKU)
(CU-KS18NKUA)
Min.
7' (2 m)
7' (2 m)
Air intake
Min. 4" (10 cm) Valve
side
Min. 10"
(25 cm)
Min.
2" (5 cm)
Air discharge
Min.
1'4" (40 cm)
ꢁ install in a location where no antenna of a television
or radio exists within 10' (3 m).
Ground
Min. 4" (10 cm)
Air intake
Fig. 5a
(CU-KS18NKU)
Anchor bolts
Obstacle above
Min.
(CU-KS18NKUA)
(CU-KS24NKU)
(4 pcs.)
(CU-KS24NKUA)
Min.
7' (2 m)
Min. 4" (10 cm)
Air intake
7' (2 m)
Air intake
Min. 6" (15 cm) Valve
side
Min. 10"
(25 cm)
Concrete
or equal
Min.
4" (10 cm)
Air discharge
Min.
1'8" (50 cm)
Ground
Min. 6" (15 cm)
Air intake
Fig. 5b
Fig. 5c
(CU-KS24NKU)
(CU-KS24NKUA)
Anchor bolts
(4 pcs.)
Min. 6" (15 cm)
Air intake
Concrete
or equal
Cushion rubber
Fig. 5e
Fig. 5d
6
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2-3. Baffle Plate for the Outdoor Unit
(CU-KSxxNKUA models only)
Air intake baffle
Wind
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.
Front
When the outdoor unit is installed in a position exposed
to strong wind (such as seasonal winds with low air tem-
perature in winter), baffle plates must be installed on the
outdoor unit. (Fig. 5f)
Back
Wind
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.
No air intake baffle
required on
this side.
Air discharge baffle
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)
Fig. 5f
7
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(1) Recommended dimensions of the baffle plates
Air Intake Baffle
Air Discharge Baffle
H
O
A
2- 15/64"
(2- 6 mm)
I
J
B
H
J
C
3- 1/4"
(3- 6.5 mm)
K
4- 1/4"
(4- 6.5 mm)
G
C
E
R
L
Q
I
E
D
K
A
G
F
F
D
B
G
Fig. 5g
Fig. 5h
For Air Intake
Dimensions
A
B
C
D
E
F
G
H
I
J
K
L
O
Q
R
Model
(inch) 24-13/32 25/32 1-25/32 22-1/4 9-1/4
9-1/4
235
25/64 25/32 19/32 23-1/8 19/64 25/64 5-29/32 25/32 25/32
10 20 15 587 7.5 10 150 20 20
CU-KS18NKUA
(mm)
620
20
45
565
25
235
(inch) 25-3/16 25/32 1-31/32
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
CU-KS24NKUA
(mm)
640
20
50
635
270
270
10
20
15
657
7.5
10
150
20
20
For Air Discharge
Dimensions
Model
A
B
C
D
E
F
G
H
I
J
K
(inch) 20-7/8 22-1/16 13-25/32 5-29/32 18-1/8 1-3/8 2-5/32 17-5/16 2-3/8 3-11/32 31/32
(mm) 530 560 350 150 460 35 55 440 60 85 25
(inch) 22-1/16 23-1/32 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
(mm) 560 585 350 150 490 35 55 465 60 85 25
CU-KS18NKUA
CU-KS24NKUA
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)
Air Intake Baffle
Air Discharge Baffle
Item
Q’ty
1
Remarks
Item
Q’ty Remarks
Baffle plate
Baffle plate
1
4
4
4
4
Screw 5/32 ꢀ 15/32" (4 ꢀ 12 mm) tapping
Bolt 15/64 ꢀ 19/32 – 25/32" (M6 ꢀ 15 – 20 mm)
Nut 15/64" (M6)
2
Attached to outdoor unit
Bolt 15/64 ꢀ 13/32 – 19/32" (M6 ꢀ 10 – 15 mm)
3
Nut 15/64" (M6)
Washer
3
Washer
3
Spring washer
Spring washer
3
8
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(3) Installation procedure
1. Air Intake Baffle
2. Air Discharge Baffle
1. Remove the panels front, top, side L and R from the
unit and drill 4 holes of ø1/4 inch (6.5 mm) at the
prescribed positions.
(1) Left side
1. Remove the top panel from the unit.
2. Remove the panel side L, and drill 3 holes of ø1/4 inch
(6.5 mm) at the prescribed positions.
3. Install the windbaffle on the unit using field supply bolts
and nuts.
2. Install the windbaffle on the unit using field supply
bolts and nuts.
3. Recommended bolts to be used are 15/64" (M6 ISO
standard), and the recommended length of the bolts
is between 13/32 – 19/32 inch (10 – 15 mm).
4. Use washers and spring washers to tightly fasten the
windbaffle to the unit.
4. Recommended bolts to be used are 15/64" (M6 ISO
standard), and the recommended length of the bolts is
between 19/32 – 25/32 inch (15 – 20 mm).
5. Use washers and spring washers to tightly fasten the
windbaffle to the unit.
(2) Right side
1. Remove the top panel from the unit.
2. Use 2 preholes on the panel side R to install the baffle plate.
3. Remove the panel side R from the unit by removing the
screws. These screws are used in step 4 below.
4. Put (sandwich) the windbaffle between the unit and the
panel side R, then install the windbaffle on the unit using the
above screws. Be careful not to damage the screw holes.
Panel side R
Panel top
Panel top
Panel front
Panel side R
Panel front
Panel side L
Panel side L
Fig. 5i
Fig. 5j
NOTE
ꢁ In order to prevent contact of the bolts and heat exchanger and other parts inside the unit, install the windbaffle using
bolts from inside the unit and fasten the bolts with nuts from outside the unit.
ꢁ When the windbaffle is installed on the unit, the unit has higher wind resistance. In order to prevent the unit from
falling over, anchor the legs of the unit using anchor bolts (or similar method).
(4) Precautions for installation
1. Be sure not to damage painted surfaces.
2. Finish the edges of the windbaffle to avoid cuts or injury.
3. Drilling of holes must be carefully done so that no damage is caused to external or internal parts of the unit.
Particular care must be taken that drill chips do not drop into the unit.
9
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3. How to Install the Indoor Unit
3-1. Remove the Rear Panel from the Unit
(1) Remove and discard the set screw on the rear
panel. (Fig. 6)
(2) Press the 2 ꢂ marks on the frame cover and disen-
gage the stationary tabs from the frame. (Fig. 7)
Set screw only for transportation
(3) Remove the rear panel.
Fig. 6
NOTE
Tubing can be extended in 5 directions as shown in Fig.
8. Select the direction you need providing the shortest
run to the outside unit.
Rear panel
ꢁ When left tubing is to be done, switch the drain hose
and drain cap. (For details, refer to “Switching drain
hose and drain cap” on page 18.)
3-2. Make a Hole
(1) Place the rear panel from the indoor unit on the wall
at the location selected. Make sure the panel is hori-
zontal, using a carpenter’s level or tape measure to
measure down from the ceiling. Wait until after cut-
ting the hole before attaching the rear panel to the
wall.
marks
Fig. 7
Right-rear
tubing
(recommended)
Left
tubing
(2) Determine which side of the unit you should make
the hole for tubing and wiring. (Fig. 9)
Left-rear
tubing
Right tubing
NOTE
In the case of left-rear tubing, use the measurement
points 2-3/8" (60 mm) from the edge of the rear panel for
precise placement of the hose outlet. (Fig. 9)
Downward tubing
Fig. 8
(3) Before making the hole, check carefully that no
studs or pipes are directly run behind the spot to be
cut.
2-3/8" (60 mm)
Also avoid areas where elec-
CAUTION
trical wiring or conduits are
located.
Fig. 9
The above precautions are also applicable if tubing
goes through the wall in any other location.
10
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(4) Using a sabre saw, key hole saw or hole-cutting drill
attachment, cut a hole in the wall. See Table 4 and
Fig. 10.
NOTE
Hole should be made at a slight downward slant to the
outdoor side.
Table 4
Indoor
side
Outdoor
side
Hole Dia.
3-5/32" (80 mm)
(5) Measure the thickness of the wall from the inside
edge to the outside edge and cut PVC pipe at a
slight angle 1/4" (6 mm) shorter than the thickness of
the wall. (Fig. 11)
Fig. 10
PVC pipe (Locally purchased)
(6) Place the plastic cover over the end of the pipe (for
indoor side only) and insert the pipe in the wall.
(Fig. 12)
3-3. Install the Rear Panel on the Wall
Cut at slight angle
Be sure to confirm that the wall is strong enough to sus-
pend the unit.
Fig. 11
INSIDE
OUTSIDE
PVC pipe
See either Item a) or b) below depending on the wall type.
Wall
Plastic cover
(Locally purchased)
a) If Wooden Wall
Slight
angle
(1) Attach the rear panel to the wall with the 8 screws
provided. (Fig. 13)
If you are not able to line up the holes in the rear
panel with the beam locations marked on the wall,
use rawl plugs or toggle bolts to go through the
holes on the panel or drill 3/16" (5 mm) dia. holes in
the panel over the stud locations and then mount the
rear panel.
Fig. 12
(2) Double check with a carpenter’s level or tape mea-
sure that the panel is level. This is important to
install the unit properly. (Fig. 14)
Fig. 13
Fig. 14
(3) Make sure the panel is flush against the wall. Any
space between the wall and unit will cause noise
and vibration.
b) If Block, Brick, Concrete or Similar Type Wall
Make 3/16" (4.8 mm) dia. holes in the wall. Insert rawl
plugs for appropriate mounting screws. (Fig. 15)
3/16"
(4.8 mm) dia. hole
Rawl plug
Fig. 15
11
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Grille
Air intake grille
3-4. Remove the Grille to Install the Indoor Unit
Basically, these models can be installed and wired with-
out removing the grille. If access to any internal part is
needed, follow the steps as given below.
How to remove the grille
(1) Grasp both ends of the air intake grille, and remove
it by opening towards the front and pulling towards
you. (Fig. 16a)
Fig. 16a
(2) Remove the 3 screws. (Fig. 16b)
(3) Remove the screw on the right side cover plate and
open the cover. (Fig. 17a)
(4) Take out the thermistor from the grille. (Fig. 17b)
Fig. 16b
(5) Press the 3 tabs at the top of the grille and the 3
tabs on the front face to separate the grille from the
frame. (Fig. 18a)
Cover
Thermistor
Thermistor
(6) Pull the grill toward you to remove it.
How to replace the grille
(1) When installing the grille, place the bottom of the
grille into the frame first. (Fig. 18b)
Fig. 17a
Fig. 17b
Tab
Then insert the tabs on the top of the grille and on
the front face into the frame.
(2) Make sure that the grille and frame are firmly fitted
together by engaging the tabs.
(3) Attach the thermistor on the grille. (Fig. 17a)
(4) Close the cover and replace the screw. (Fig. 17a)
Tab
(5) Affix the grille with the 3 previously removed screws.
(Fig. 16b)
Fig. 18a
(6) Install the air intake grille.
(a) 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. (Fig. 19a)
(b) Press the bottom right and left corners and center of
the air intake grille to attach it to the indoor unit.
(Fig. 19b)
NOTE
Fig. 18b
Groove
Attach so that the round pins at the top right and left cor-
ners of the air intake grille are inserted into the grooves
at the top right and left of the indoor unit.
Pin
Fig. 19b
Fig. 19a
12
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3-5. Shape the Indoor Side Tubing
(1) Arrangement of tubing by direction
a) Right or left tubing
Frame
Cut out the corner of the right/left frame with a
hacksaw or the like. (Figs. 20 and 21)
Left tubing
outlet
b) Right-rear or left-rear tubing
In this case, the corner of the frame need not be
cut.
(2) To mount the indoor unit on the rear panel:
Fig. 20
Hang the 2 mounting slots of the unit on the
upper tabs of the rear panel. (Fig. 22)
Frame
3-6. Wiring Instructions
General precautions on wiring
Right tubing
outlet
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring
closely following the wiring diagram.
(2) Provide a power outlet to be used exclusively for
each unit, with a power supply disconnect and cir-
cuit breaker for overcurrent protection provided in
the exclusive line.
Fig. 21
(3) To prevent possible hazards due to insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done tightly and in
accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become
damaged.
Fig. 22
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.
13
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3-7. Recommended Wire Length and Diameter
Regulations on wiring diameter differ from locality to locality. For field wiring
requirements, please refer to your local electrical codes. Carefully observe these
regulations when carrying out the installation.
Table 5 lists recommended wire lengths and diameters for power supply systems.
NOTE
Refer to the wiring system diagram (Fig. 23) for the meaning of (A), (B), and (C) in
Table 5.
Refer to your local codes or in the absence of local codes see the National Elec-
tric Code: ANSI/NFPA70.
Table 5
(A)+(B)
(A) Power Supply Wiring Length (ft)
(B) Power Line Length (ft)
(C) Control
Line Length (ft)
AWG
Fuse or Circuit
Breaker Capacity
Model
(#14)
(#12)
(#14)
CU-KS18NKU, CU-KS18NKUA
CU-KS24NKU
131 (Max.)
131 (Max.)
131 (Max.)
230 (Max.)
230 (Max.)
230 (Max.)
100 (Max.)
132 (Max.)
100 (Max.)
15A
20A
20A
CU-KS24NKUA
# ... AWG (American Wire Gauge)
WARNING
WIRING SYSTEM DIAGRAM
*
INDOOR
UNIT
Terminal
OUTDOOR
ꢁ Be sure to comply with local codes on running the wire
from the indoor unit to the outdoor unit (size of wire and
wiring method, etc.).
Disconnect
UNIT
switch
Field supply
Terminal
(B)
230/208V
1
1
2
ꢁ Each wire must be firmly connected.
230/208V
2
ꢁ No wire should be allowed to touch refrigerant tubing, the
compressor, or any moving part.
230/208V
3
3
(C)
4
(A)
L1
L2
5
6
Grounding line
WARNING
(B)
ꢁ To avoid the risk of electric shock, each air conditioner
unit must be grounded.
Grounding
line
Fig. 23
ꢁ For the installation of a grounding device, please
observe local electrical codes.
NOTE
*
ꢁ Grounding is necessary, especially for units using
inverter circuits, in order to release charged electricity
and electrical noise caused by high tension.
Otherwise, electrical shock may occur.
Disconnect switch may be required by national
or local codes.
ꢁ Place a dedicated ground more than 7' (2 m) away from
other grounds and do not have it shared with other elec-
tric appliances.
CAUTION
Always comply with national and local code
requirements.
CAUTION
ꢁ Be sure to connect the power supply line to the outdoor unit as shown in the wiring diagram.
The indoor unit draws its power from the outdoor unit.
ꢁ Do not run wiring for antenna, signal, or power lines of television, radio, stereo, telephone,
security system, or intercom any closer than 3'4" (1 m) from the power cable and wires
between the indoor and outdoor units. Electrical noise may affect the operation.
14
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3-8. Wiring Instructions for Inter-unit Connections
Rear
panel
Wall
(1) Insert the inter-unit wiring (according to local codes)
into the through-the-wall PVC pipe. Run the wiring
toward the indoor side allowing approx. 10" (25 cm)
to extend from the wall face. (Fig. 24)
Plastic
cover
(2) Grasp both ends of the air intake grille, and remove
it by opening towards the front and pulling towards
you.
Wiring
10"
(25 cm)
(3) Remove the screw on the right side cover plate and
open the cover. (Fig. 25)
Fig. 24
Fig. 25
Fig. 26a
(4) Route the inter-unit wiring from the back of the
indoor unit and pull it toward the front for connec-
tion. (Fig. 26a, 26b)
Cover
(5) Connect the inter-unit wiring to the corresponding
terminals on the terminal plate (Fig. 26a, 26b) while
referring to the wiring diagram.
(6) Be sure to secure the wiring with the provided
clamp.
NOTE
When closing the air intake grille, press the bottom right
and left corners and center. (Fig. 27)
Please refer to “How to replace the grille” on page 12 for
installing the air intake grille.
Terminal
plate
Fig. 27
Inter-unit
wiring
Earth
plate
Lock nut
Top of conduit
connector
Fig. 26b
15
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Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist. There-
fore, be sure all wiring is
tightly connected.
WARNING
When connecting each power wire to the corresponding
terminal, follow the instructions “How to connect wiring
to the terminal” and fasten the wire securely tight with
the fixing screw of the terminal plate.
9/32"
(7 mm)
(ACTUAL
SIZE)
STRIP
SIZE
How to connect wiring to the terminal
a) For Indoor Unit
Fig. 28
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the wire about 9/32" (7 mm).
See the label (Fig. 28) near the terminal plate.
Solid wire
Loop
(2) Using a screwdriver, loosen the terminal screw on
the terminal plate.
(3) Insert the wire and tighten the terminal screw com-
pletely using a screwdriver.
Insulation
b) For Outdoor Unit
Fig. 29
ꢀ For solid core wiring (or F-cable)
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the solid wire about 15/16"
(25 mm). (Fig. 29)
Stranded wire
Ring
connector
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
(3) Using the pliers, bend the solid wire to form a loop
suitable for the terminal screw.
Fig. 30
(4) Shape the loop wire properly, place it on the termi-
nal plate and fix it securely with the removed termi-
nal screw using a screwdriver.
Twist wire ends
ꢀ For stranded wiring
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the stranded wiring about 3/8"
(10 mm) and tightly twist the wire ends. (Figs. 30
and 31)
Fig. 31
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
Special
washer
Screw
(3) Using a ring connector fastener or pliers, securely
clamp each stripped wire end with a ring connector.
(Fig. 30)
Screw and
special washer
Ring connector
Terminal plate
Ring
connector
Wire
(4) Place the ring connector wire, and replace and
tighten the removed terminal screw using a screw-
driver. (Fig. 32)
Wire
Fig. 32
16
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3-9. Mounting
(1) To install the indoor unit, mount the indoor unit onto
the 2 tabs on the upper part of the rear plate.
(2) Hold down the air discharge outlet and press the
lower part of the indoor unit until it clicks to securely
fasten to the 2 tabs on the lower part of the rear
plate. (Fig. 33)
Push
NOTE
For tubing, choose either the right or left tubing direction
and follow the steps below. This work can be made easi-
er by placing padding material (such as styrofoam) at the
rear right side of the indoor unit. (Fig. 34)
Fig. 33
ꢀ Right-side tubing
(1) Shape the refrigerant tubing so that it can easily go
into the wall hole. (Fig. 35)
(2) Push the wiring, refrigerant tubing, and drain hose
through the hole in the wall. Adjust the indoor unit so
it is securely seated on the rear panel. (Fig. 36)
Padding material
(3) Carefully bend the tubing (if necessary) to run along
the wall in the direction of the outdoor unit and then
tape as far as the fittings. (See Caution on page
21.) The drain hose should come straight down the
wall to a point where water runoff won’t stain the
wall.
Fig. 34
Rear panel
Cover
Refrigerant
tubing
(4) Connect the refrigerant tubing to the outdoor unit.
(After performing a leak test on the connecting part,
insulate it with the tubing insulation. (Fig. 37a)) Also,
refer to Section 5-4. Connecting Tubing between
Indoor and Outdoor Units.
Inter-unit
wiring
Drain hose
(5) Assemble the refrigerant tubing, drain hose, and
conduit (including inter-unit wiring) as shown in
Fig. 37b.
Fig. 35
Refrigerant tubing
Insulation
Fig. 37a
Conduit
Drain hose
Fig. 36
Inter-unit wiring
Fig. 37b
17
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ꢀ Left-side tubing
Rear panel
(1) Lead the tubing and drain hose through the wall,
allowing sufficient length for connection. Then bend
the tubing using a tube bender to make the attach-
ment. (Fig. 38)
Hole in wall
Wide tube
Narrow tube
Bent part
(2) Switch the drain hose and drain cap.
Fig. 38
Switching drain hose and drain cap
(a) Locate the drain hose and the drain cap.
(Fig. 39)
(b) Remove the screw fastening the drain hose on
the right side, and pull out the drain hose to
remove it. (Fig. 39)
Drain cap
(c) Apply moderate force to pull off the drain cap
on the left side. (If you cannot pull it off by
hand, use a long-nose pliers.)
Drain hose
Fig. 39
(d) Reattach the drain hose to the left side and the
drain cap to the right side. (Fig. 40a)
Drain hose
Drain hose
Slide the drain hose fully onto the drain pan outlet
until the drain hose edge is pushed into the insula-
tion. Check that the screw holes in the drain bracket
and the drain pan outlet are aligned and securely in
contact, then fasten them with the screw. (After
attaching the drain hose, check that it is attached
securely.) (Fig. 40c)
Clamp
Drain cap
Drain cap
Use a Phillips screwdriver to push the drain cap in
firmly. (If it is difficult to push in, wet the cap with
water first.)
Fig. 40a
Screw hole
(3) Install the indoor unit on the rear panel.
(4) Connect the tubing and wiring led inside from out-
doors.
Drain pan outlet
(5) After completing a leak test, bundle the tubing
together with armoring tape and store it inside the
tubing storage area at the back of the indoor unit
and hold it with clamps. (Figs. 40a and 41)
Insulation
Drain bracket
Drain bracket
Screw
Drain hose
Drain hose
Fig. 40c
Fig. 40b
Refrigerant tubing
Inter-unit wiring
Conduit
Fig. 41
18
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To unmount indoor unit
Press the 2 ꢂ marks on the lower part of the indoor unit
and unlatch the tabs. Then lift the indoor unit and
unmount. (Fig. 42)
3-10. Drain Hose
a) The drain hose should be slanted downward to the
outdoors. (Fig. 43)
b) Never form a trap in the course of the hose.
c) If the drain hose will run in the room, insulate the
hose with insulation* so that chilled condensation
will not damage furniture or floors. (Fig. 44)
Push
* Foamed polyethylene or its equivalent is recom-
Fig. 42
mended.
Do not supply power to the
WARNING
unit or operate it until all
tubing and wiring to the out-
side unit are completed.
Slant
Indoor
unit
Drain
hose
Risk of Electric Shock
Fig. 43
Condensation
Insulation material
(Locally purchased)
must be used.
Fig. 44
19
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4. How to Install the Outdoor Unit
First refer to Section 2. Installation Site Selection.
4-1. Wiring Instructions for the Outdoor Unit
Lock nut
Regulations on wire size differ from locality to locality. For
field wiring requirements, please refer to your local elec-
trical codes. Make sure that the installation fully complies
with all local and national regulations.
Cabinet
(1) Remove access panel “C”. (Fig. 46)
Terminal
block
(2) Connect the inter-unit and power supply line accord-
ing to the drawing on the panel side.
(3) Be sure to size each wire allowing approx. 4"
(10 cm) longer than the required length for wiring.
Store excess wiring inside the cabinet.
Conduit
plate
(4) When connections are completed, check that all
connections are correct as shown in the wiring sys-
tem diagram on panel side.
Access panel “C”
(5) Be sure to ground the unit according to your local
codes.
Inter unit
(Conduit)
Power supply
(Conduit)
Plug
Fig. 46
20
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Deburring
5. Refrigerant Tubing
After
Before
5-1. Use of the Flaring Method
Many of the conventional split system air conditioners
employ the flaring method to connect refrigerant tubes
which run between indoor and outdoor units. In this
method, the copper tubes are flared at each end and
connected with flare nuts.
5-2. Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a
tube cutter. It is recommended to cut approx. 12" to
20" (30 to 50 cm) longer than the tubing length you
estimate.
Fig. 47
Copper
tubing
(2) Remove burrs at the end of the copper tube with a
tube reamer or file. This process is important and
should be done carefully to make a good flare.
(Fig. 47)
Reamer
NOTE
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 48)
Fig. 48
If the previous flare tool
(clutch-type) is used:
If the special R410A
flare tool is used:
(3) Remove the flare nut from the unit and be sure to
mount it on the copper tube.
0.0472" (1.2 mm)
(4) Make a flare at the end of copper tube with a flare
0 to 0.0196"
(0 to 0.5 mm)
tool.* (Figs. 49a and 49b)
Adjust so that the amount of tube
protrusion is as shown in the figure.
(*Use “RIDGID” or equivalent.)
Fig. 49a
NOTE
A good flare should have the following characteristics:
ꢁ inside surface is glossy and smooth.
ꢁ edge is smooth.
Flare nut
Copper
tubing
ꢁ tapered sides are of uniform length.
5-3. Caution before Connecting Tubes Tightly
Flare tool
a) Be sure to apply a sealing cap or water-proof tape
to prevent dust or water from getting into the tubes
before they are used.
Fig. 49b
b) Be sure to apply refrigerant lubricant to the match-
ing surfaces of the flare and union before connect-
ing them together. This is effective for reducing gas
leaks. (Fig. 50)
Apply refrigerant
lubricant here and here
Fig. 50
c) For proper connection, align the union tube and
flare tube straight with each other, then screw in the
flare nut lightly at first to obtain a smooth match.
(Fig. 51)
Flare nut
Union
Fig. 51
21
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5-4. Connecting Tubing between Indoor and
Outdoor Units
Torque wrench
a) Tightly connect the indoor side refrigerant tubing exten-
ded from the wall with the outdoor side tubing. (Fig. 52)
Spanner
Indoor unit
b) To fasten the flare nuts, apply specified torque as:
Table 6
Outdoor unit
Tube Dia.
Nut
Tightening Torque
Fig. 52
1/4" (6.35 mm)
3/8" (9.52 mm)
1/2" (12.70 mm)
5/8" (15.88 mm)
21/32" (17 mm)
7/8" (22 mm)
Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)
Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)
Approx. 430 – 480 lbs·in (490 – 550 kgf·cm)
Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)
1-1/32" (26 mm)
1-5/32" (29 mm)
Insulation
5-5. Insulation of Refrigerant Tubing
Fig. 53
IMPORTANT
To prevent heat loss and wet floors due to dripping of con-
densation, both tubes must be well insulated with a
proper insulation material. (Fig. 53)
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 54)
Insulation
Thickness:
min. 5/16"
(8 mm)
Min.
5/16"
(8 mm)
Fig. 54
After a tube has been insulat-
CAUTION
ed, never try to bend it into a
narrow curve, as this may
cause the tube to break or
crack.
Clamp
Insulated tubes
5-6. Taping the Tubes
(1) At this time, the 2 refrigerant tubes (and electrical wire
if local codes permit) should be taped together with
armoring tape. The drain hose may also be included
and taped together as 1 bundle with the tubing.
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As
you wrap the tubing, overlap half of each previous tape
turn. (Fig. 55)
Fig. 55
Apply putty here
(3) Clamp the tubing bundle to wall, using 1 clamp approx.
every 47" (120 cm).
NOTE
Do not wind the armoring tape too tightly, since this will
decrease the heat insulation effect. Also, be sure the con-
densation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
Tubing
Fig. 56
5-7. Finishing the Installation
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent rain
and draft from entering. (Fig. 56)
22
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6. Air Purging
Indoor unit
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below. Therefore,
they must be purged completely.
ꢁ pressure in the system rises
ꢁ operating current rises
ꢁ cooling (or heating) efficiency drops
ꢁ moisture in the air may freeze and block capillary tubing
Outdoor unit
ꢁ water may lead to corrosion of parts in the refrigerant
system
ꢀ Air Purging with a Vacuum Pump (for Test Run)
(1) Check that each tube (both narrow and wide tubes)
between the indoor and outdoor units have been
properly connected and all wiring for the test run
has been completed. Note that both narrow and
wide tube service valves on the outdoor unit are
kept closed at this stage.
(2) Using an adjustable wrench or box wrench, remove
the valve caps from the service valve on both nar-
row and wide tubes.
Manifold valve
(Exclusively for R410A)
(3) Connect a vacuum pump and a manifold valve (with
pressure gauges) to the service port on the wide
tube service valve. (Fig. 57)
Lo
Hi
Pressure
gauge
The service port on the wide tube
CAUTION
service valve uses a Schrader core
valve to access the refrigerant sys-
tem. The valve core is similar to
those used in automobile tires.
Therefore, be sure to use a vacuum
hose connector which has a push-
pin inside.
Charging hose
(Exclusively for R410A)
Vacuum pump adapter
(Exclusively for R410A)
(with reverse flow prevention)
Vacuum pump
Be sure to use a manifold valve
for air purging. If it is not avail-
able, use a stop valve (field sup-
ply) for this purpose. The “Hi”
knob of the manifold valve must
always be kept closed.
CAUTION
Fig. 57
NOTE
To prevent other refrigerants from being mistakenly
charged to units which use R410A, the size of the
charge port on the service valve is different from the
one for other refrigerant types. For servicing such as
recharging, the specified charging hose, manifold and
vacuum pump adapter (with reverse flow prevention)
for R410A must be used.
(4) With the “Lo” knob of the manifold valve open, run
the vacuum pump. The operation time for the vacu-
um pump varies with tubing length and the capacity
of the pump. The following table shows the amount
of time for evacuation:
Table 7
Required time for evacuation when
100 liter/h vacuum pump is used
NOTE
If tubing length is
If tubing length is
The required time in Table 7 is calculated based on the
assumption that the ideal (or target) vacuum condition
is around 10 mmHg abs.
less than 33 ft. (10 m)
more than 33 ft. (10 m)
10 min. or more
15 min. or more
23
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(5) With the vacuum pump still running, close the “Lo”
knob of the manifold valve. Then stop the vacuum
pump.
90° (1/4 turn)
Narrow tube
(6) With the hex wrench, turn the valve stem on the
narrow tube service valve counter-clockwise by
90 degrees (1/4 turn) for 10 seconds, and then turn
the stem clockwise to close it again. (Fig. 58)
Hex wrench
Wide tube
Be sure to completely insert
the hex wrench before
CAUTION
Valve cap
attempting to turn the valve.
Vacuum hose to manifold valve
(7) Leak test all joints at the tubing (both indoor and out-
doors) with soapy water. Bubbles indicate a leak. Tight-
en the joint more when leaks, then check if there is no
leak. Be sure to wipe off the soap with a clean cloth.
Fig. 58
(8) With the hex wrench, turn the wide tube service
valve stem counter-clockwise to fully open the valve.
(9) Turn the narrow tube service valve stem counter-
clockwise to fully open the valve.
(10) Loosen the vacuum hose connected to the wide
tube service port slightly to release the pressure.
Then, remove the hose.
This may cause the refriger-
ant gas to leak. In order to
avoid this, take off the hose
quickly.
CAUTION
(11) Fasten the valve cap on the wide tube service port
securely with an adjustable wrench or box wrench.
Next, mount the valve cap on the service valve and
tighten it to 170 lbs·in (200 kgf·cm) with a torque
wrench. This process is very important to prevent
gas from leaking from the system.
(12) Test run the air conditioner. (See next page.)
(13) While the air conditioner is running, apply liquid
soap to check for any gas leaks around the service
valves or caps.
(14) If there is no leakage, stop the air conditioner.
(15) Wipe off the soap on the tubing.
This completes air purging with a vacuum pump and the
air conditioner is ready for actual operation.
24
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How to Test Run the Air Conditioner
After turning on the power of the air conditioner, use the
remote controller and follow the steps below to conduct the
test run.
(1) Set the remote controller in Test Run mode.
(Fig. 59a)
a)Press and hold the QUIET button and the 1HR.
TIMER button.
b)Then press and hold the ACL (Reset) button with a
pointed object such as the tip of a pen. After 5 sec-
onds, release the ACL button first.
ON/OFF
operation
button
QUIET
button
c)Then release the QUIET and 1HR. TIMER buttons.
1HR.
d)
appears and “oP-1” blinking in the remote con-
troller clock display area. (Fig. 59b)
TIMER
button
(2) Start Cooling mode test run by pressing the ON/OFF
operation button of the remote controller. (Fig. 59a)
‡ 7KLVꢀVWDUWVꢀWKHꢀIDQꢀSURGXFLQJꢀXQFRROHGꢀIRUFHGꢀDLUꢀZLWK
the 3 indicator lamps (OPERATION lamp, TIMER
lamp and QUIET lamp) on the main unit blinking.
(Fig. 59c)
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tion, and cool air will start to be felt. Cooling mode
test run is unaffected by the room temperature.
ACL
(Reset)
button
(3) Press the ON/OFF operation button of the remote con-
troller again to stop the test run. (Fig. 59a)
Fig. 59a
(4) Finally press the ACL (Reset) button of the remote con-
troller to release it from Test Run mode to return to nor-
mal mode. (Fig. 59a)
‡ ´ µꢀDQGꢀ´R3ꢂꢇµꢀZLOOꢀGLVDSSHDUꢀIURPꢀWKHꢀUHPRWHꢀFRQꢂ
troller clock display area.
NOTE
Troubleshooting:
In the event that the green “OPERATION lamp” is blinking
upon powering up the system, an error condition exists.
In this case, refer to the self-diagnostics procedure on the
inside of the front cover.
Fig. 59b
IMPORTANT
After the test run is completed, be sure to press the
ACL (Reset) button to return to normal mode. The
air conditioner will not operate correctly if this is not
done.
OPERATION lamp
TIMER lamp
QUIET lamp
Fig. 59c
25
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ꢀ Basic Functions of the Service Valves
The basic functions of the service valves are given in Table 8 below.
Table 8
Narrow Tube Service
Valve (2-Way)
Wide Tube Service
Valve (3-Way)
Action
O-ring
Valve cap
Stem
CLOSED
Shipping
Fully OPEN
Fully OPEN
CLOSED
Operating and
test running
the air conditioner
Measuring pressure
and gas charging
*
* The service port on the wide tube ser-
vice valve uses a Schrader core valve
to access the refrigerant system.
Therefore, be sure to use a hose con-
nector which has a push-pin inside.
(Fig. 60a)
Air purging with
a vacuum pump
*
Service valve
Hose with push-pin
CAUTION
Close
When opening or closing
the service valve stem,
use the hex wrench.
Be sure to fully seat the
wrench before turning
the valve.
PUSH
Open
Hex
wrench
NOTE
External diameter of service port
R410A: 5/16"
Fig. 60b
Fig. 60a
ꢀ Pump Down
Pump down means collecting all refrigerant gas in the
system back into the outdoor unit without losing any of
the gas. Pump down is used when the unit is to be
moved or before servicing the refrigerant circuit.
(2) Using a hex wrench, turn the narrow tube service
valve clockwise all the way to close the service
valve. (Be sure to confirm that the wide tube service
valve is fully open.)
(3) Press the operation button and start cooling oper-
ation.
Pump Down Procedure
Be sure to carry out pump down with the unit in
cooling mode.
(4) When the low pressure gauge reading falls to 14.2 to
7.1 psi (1 to 0.5 kg/cm2), fully close the wide tube
valve stem. Then quickly stop the unit.
(1) Connect the Lo side charging hose of the manifold
valve to the service port on the wide tube service
valve.
(5) Disconnect all gauges and hoses, and replace the
valve caps as they were before.
26
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ꢀ Service Valve Connections
a) Temporary connection:
Screw in 3 – 5 turns by hand. (Fig. 60c)
b) To fasten the flare nuts, apply specified torque
as Table 9 and Fig. 60d.
Torque wrench
Table 9
Fig. 60c
Fig. 60d
Tube Dia.
Nut
Tightening Torque
Be sure to tighten the
flare nut using the
prescribed torque.
If the nut is over-
1/4" (6.35 mm)
3/8" (9.52 mm)
1/2" (12.70 mm)
5/8" (15.88 mm)
21/32" (17 mm)
7/8" (22 mm)
Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)
Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)
Approx. 430 – 480 lbs·in (490 – 550 kgf·cm)
Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)
CAUTION
1-1/32" (26 mm)
1-5/32" (29 mm)
tightened, refrigerant
leakage may occur.
7. Remote Controller Installation Position
The remote controller can be operated from either a
non-fixed position or 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 place where it is covered
ꢁ More than 26' (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
interference
ꢁ Where there is an obstacle between the remote con-
troller and the air conditioner (since a check signal is
sent from the remote controller every 5 minutes)
7-1. Mounting on a Wall
Before mounting the remote controller, press the
ON/OFF operation button at the mounting location to
make sure that the air conditioner operates from that
location. The indoor unit should make a beeping sound
to indicate that it has received the signal.
Rear side
Remote control holder
Press
Set in
place
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.
Mounting screws
5/32 x 5/8" (4 x 16 mm)
(Included)
To take out the remote controller, pull it forward.
Fig. 61
27
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8. Address Switch
Tab
8-1. Address Setting of the Remote Controller
The address can be set in order to prevent interference
between remote controllers when 2 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.
Fig. 62
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. 62). When the tab is removed, the address is
automatically set to B (Fig. 63).
ACL button
(3) Press and hold the remote controller QUIET button
and 1HR. 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 the ACL
button first, then release the QUIET and 1HR.
TIMER buttons. “oP-1” (Test Run) appears, blinking
in the remote controller clock display area.
Fig. 63
(4) Each time the 1HR. 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. 64)
Test run mode
ON/OFF
Selfdiagnostic mode
Address setting mode
operation
button
QUIET
button
1HR.
(5) “oP-7” has now been selected for address setting.
TIMER
button
(6) Press the ON/OFF operation button on the remote
controller. (Fig. 64) Check that the “beep”signal-
received sound is heard from the second indoor unit
(approximately 5 times). The sound you hear is the
signal that the remote controller address has been
changed.
(7) Finally press the remote controller ACL (Reset) but-
ton to cancel the blinking “oP-7” display.
(Fig. 64)
Changing of the second remote controller address is
now completed.
ACL
A
(Reset)
button
Fig. 64
28
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DC1111-0
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