TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT : CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
Capacity at 230V
19,700 BTU/h
25,400 BTU/h
30,600 BTU/h
Outdoor Model No. Product Code No.
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
1 852 361 24
1 852 361 25
1 852 361 26
< Applicable Indoor Units >
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
Wall mounted type
CS-MKS7NKU
CS-MKS9NKU
CS-MKS12NKU
CS-MKS18NKU
CS-MKS24NKU
Semi-concealed type
CS-MKS9NB4U & CZ-18BT1U
CS-MKS12NB4U & CZ-18BT1U
CS-KS18NB4UW & CZ-18BT1U
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
REFERENCE NO. SM700877
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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
SAFETY PRECAUTIONS ..............................................................................................................
TABLE OF CONTENTS ......................................................................................................................
APPLICABLE INDOOR UNITS .....................................................................................................
1. OPERATING RANGE ...................................................................................................................
2
4
6
7
2. SPECIFICATIONS
2-1. Unit Specifications .............................................................................................................
8
2-2. Major Component Specifications ....................................................................................... 17
2-3. Other Component Specifications ....................................................................................... 20
3. DIMENSIONAL DATA ................................................................................................................... 21
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram ................................................................................................... 24
5. PERFORMANCE DATA
5-1. Temperature Charts ............................................................................................................ 27
5-2. Cooling Capacity ................................................................................................................ 50
5-3. Cooling Capacity (Low Ambient) ........................................................................................ 56
6. ELECTRICAL DATA
.................................................................................................... 62
6-1. Electric Wiring Diagrams
7. FUNCTIONS
..................................................................................................... 65
7-1. Explanation of Functio.n..s........................................................................................................ 69
7-2. Protective Functions
8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE.)......................................................... 71
8-1. Precautions before Performing Inspection or .R..e..p..a..i.r............................................................. 72
8-2. Trouble Diagnosis by Error Moni.t.o..p...L..a..m...p..s........................................................................... 73
8-3. Checking the Outdoor System ......................................................................................... 74
8-4. Trouble Diagnosis of Each Part ......................................................................................... 78
8-5. Trouble Diagnosis of Fan Motor
4
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Page
9. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
9-1. Characteristics of New Refrigerant R410A ......................................................................... 79
9-2. Checklist before Servicing ................................................................................................... 80
9-3. Tools Specifically for R410A ................................................................................................ 81
9-4. Tubing Installation Procedures ............................................................................................ 81
9-5. In Case of Compressor Malfunction .................................................................................... 82
9-6. In Case Refrigerant is Leaking ............................................................................................ 84
9-7. Charging Additional Refrigerant .......................................................................................... 85
9-8. Retro-Fitting Existing Systems ............................................................................................ 85
APPENDIX A INSTALLATION INSTRUCTIONS ............................................................................. A-1
5
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APPLICABLE INDOOR UNITS
Wall Mounted Type
Indoor Unit
CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU
Multi-Outdoor Unit
3-Room
4-Room
4-Room
CU-3KS19NBU
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
CU-4KS24NBU
CU-4KS31NBU
Semi-Concealed Type
CS-MKS9NB4U CS-MKS12NB4U CS-KS18NB4UW
Indoor Unit
&
&
&
CZ-18BT1U
CZ-18BT1U
CZ-18BT1U
Multi-Outdoor Unit
3-Room
4-Room
4-Room
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
YES
YES
YES
YES
YES
YES
YES
YES
YES
6
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1. OPERATING RANGE
Temperature
Indoor Air Intake Temp.
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
Outdoor Air Intake Temp.
115 °F DB
Maximum
Cooling
Minimum
14 °F DB
7
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2. SPECIFICATIONS
2-1. Unit Specifications
Outdoor Unit CU-3KS19NBU
Indoor Unit
CS-MKS9NKU × 2
< 230V >
Duct Less Type Rated
Type
3-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
3
3
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
17,000 ( 6,800 to 18,800 )
5.00 ( 1.90 to 5.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
14,300
2,700
1,707 (2,900)
187 to 253
6.3
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
1,420
98
12.0
18.0
13.0
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
%
BTU/h/W
BTU/Wh
A
A
15
Outdoor Unit
Microprocessor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Control
Fan Speeds
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 3
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Shipping Volume
Remarks:
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 2units
Outdoor Unit : CU-3KS19NBU 1unit
The combination indoor unit is AHRI 210/240.
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
8
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Outdoor Unit CU-3KS19NBU
Indoor Unit
CS-MKS9NKU × 3
< 230V >
Type
3-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
3
3
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
18,800 ( 9,800 to 18,800 )
5.50 ( 2.90 to 5.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
16,000
2,800
1,707 (2,900)
187 to 253
6.7
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
1,500
Power Factor
%
98
EER
BTU/h/W
12.5
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
13.0
15
Outdoor Unit
Microprocessor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Control
Fan Speeds
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 3
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 3units
Outdoor Unit : CU-3KS19NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
9
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Outdoor Unit CU-3KS19NBU
Indoor Unit
CS-MKS9NKU × 3
< 208V >
Type
3-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
3
3
208V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
18,800 ( 9,800 to 18,800 )
5.50 ( 2.90 to 5.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
16,000
2,800
1,707 (2,900)
187 to 253
7.4
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
1,500
Power Factor
%
98
EER
BTU/h/W
12.5
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
13.0
15
Outdoor Unit
Microprocessor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Control
Fan Speeds
Compressor
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 3
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 3units
Outdoor Unit : CU-3KS19NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
10
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Outdoor Unit CU-4KS24NBU
Indoor Unit
CS-MKS7NKU + CS-MKS9NKU × 2
< 230V >
Duct Less Type Rated
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,200 ( 9,800 to 25,400 )
7.10 ( 2.90 to 7.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
20,300
3,900
1,707 (2,900)
187 to 253
10.7
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,420
98
10.0
18.0
13.0
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
%
BTU/h/W
BTU/Wh
A
A
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3 + 1/2 (12.7) × 1
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Shipping Volume
Remarks:
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKE7NKU 1units / CS-MKE9NKU 2units
The combination indoor unit is AHRI 210/240.
Outdoor Unit : CU-4KS24NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
11
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Outdoor Unit CU-4KS24NBU
Indoor Unit
CS-MKS9NKU × 3
< 230V >
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
25,400 ( 9,800 to 25,400 )
7.50 ( 2.90 to 7.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
21,400
4,000
1,707 (2,900)
187 to 253
11.3
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,560
Power Factor
%
98
EER
BTU/h/W
9.9
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
13.0
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3 + 1/2 (12.7) × 1
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 3units
Outdoor Unit : CU-4KS24NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
12
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Outdoor Unit CU-4KS24NBU
Indoor Unit
CS-MKS9NKU × 3
< 208V >
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
208V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
24,400 ( 9,800 to 24,400 )
7.20 ( 2.90 to 7.20 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
20,600
3,800
1,707 (2,900)
187 to 253
12.1
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,460
Power Factor
%
98
EER
BTU/h/W
9.9
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
13.0
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 6.17 (2,800)
Electric Expansion Valve
50
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
82 (25)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 3 + 1/2 (12.7) × 1
Outdoor Unit
29-1/8 × 35-7/16 × 12-19/32
(740 × 900 × 320)
34-3/16 × 41-11/32 × 16-21/32
(868 × 1,050 × 423)
138.9 (63.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
147.7 (67.0)
13.41 (0.38)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 3units
Outdoor Unit : CU-4KS24NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
13
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Outdoor Unit CU-4KS31NBU
Indoor Unit
CS-MKS7NKU × 3 + CS-MKS9NKU
< 230V >
Duct Less Type Rated
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
29,000 ( 9,800 to 29,000 )
8.50 ( 2.90 to 8.50 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
24,400
4,600
1,942 (3,300)
187 to 253
11.4
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,600
99
11.2
17.6
17.0
Power Factor
EER
SEER
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
%
BTU/h/W
BTU/Wh
A
A
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 8.38 (3,800)
Electric Expansion Valve
53
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
100 (30.5)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 2 + 1/2 (12.7) × 2
Outdoor Unit
35-1/32 × 35-7/16 × 12-19/32
(890 × 900 × 320)
40-1/8 × 41-11/32 × 16-21/32
(1,019 × 1,050 × 423)
174.2 (79.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Shipping Volume
Remarks:
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
183.0 (83.0)
15.88 (0.45)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKE7NKU 3units / CS-MKE9NKU 1units
The combination indoor unit is AHRI 210/240.
Outdoor Unit : CU-4KS31NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
14
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Outdoor Unit CU-4KS31NBU
Indoor Unit
CS-MKS9NKU × 4
< 230V >
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
230V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
30,600 ( 9,800 to 30,600 )
9.00 ( 2.90 to 9.00 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
25,800
4,800
1,942 (3,300)
187 to 253
12.3
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,800
Power Factor
%
99
EER
BTU/h/W
10.9
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
17.0
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 8.38 (3,800)
Electric Expansion Valve
53
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
100 (30.5)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 2 + 1/2 (12.7) × 2
Outdoor Unit
35-1/32 × 35-7/16 × 12-19/32
(890 × 900 × 320)
40-1/8 × 41-11/32 × 16-21/32
(1,019 × 1,050 × 423)
174.2 (79.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
183.0 (83.0)
15.88 (0.45)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 4units
Outdoor Unit : CU-4KS31NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
15
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Outdoor Unit CU-4KS31NBU
Indoor Unit
CS-MKS9NKU × 4
< 208V >
Type
4-Room Multi Outdoor Unit
Number of Connectable Indoor Units
Number of Operatable Indoor Units
Voltage Rating
4
4
208V Single-Phase 60Hz
Cooling
Total Capacity
BTU/h
kW
28,600 ( 9,800 to 28,600 )
8.40 ( 2.90 to 8.40 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Available Voltage Range
Running Amperes
Power Input
24,200
4,400
1,942 (3,300)
187 to 253
12.7
BTU/h
BTU/h
ft3/min (m3/h)
V
A
W
2,560
Power Factor
%
99
EER
BTU/h/W
11.2
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
A
A
17.0
20
Outdoor Unit
Microprocessor
Control
Fan Speeds
Compressor
Auto (Hi, Me, Lo)
DC Twin Rotary (Inverter)
R410A / 8.38 (3,800)
Electric Expansion Valve
53
Refrigerant / Amount charged at shipment
Refrigerant Control
Operation Sound (High) Cool
Refrigerant Tubing Connections
Max. allowable tubing length per unit
Ibs (g)
dB-A
Flare Type
100 (30.5)
1/4 (6.35) × 4
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
Tube Diameter
3/8 (9.52) × 2 + 1/2 (12.7) × 2
Outdoor Unit
35-1/32 × 35-7/16 × 12-19/32
(890 × 900 × 320)
40-1/8 × 41-11/32 × 16-21/32
(1,019 × 1,050 × 423)
174.2 (79.0)
Unit Dimensions
inch
(mm)
inch
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
Weight
Net
Shipping
Ibs (kg)
Ibs (kg)
cu.ft (m3)
183.0 (83.0)
15.88 (0.45)
Shipping Volume
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks:
1. The values shown in performance section and electrical rating section above are based on the following unit combination.
For other combination unit, please refer to the "Unit Combination Tables" in this manual.
Indoor Unit : CS-MKS9NKU 4units
Outdoor Unit : CU-4KS31NBU 1unit
2. Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB
Outdoor air temp. 95 °F DB / 75 °F WB
16
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2-2. Major Component Specifications
2-2-1. Outdoor Unit
Outdoor Unit CU-3KS19NBU
Control PCB
Part No.
Controls
CB-CU-3KS19NBU
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
5KD240XAB21 / 1,700W
FV50S ... 1.91 (900)
U - V : 0.720
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
Pints (cc)
V - W : 0.708
W - U : 0.726
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-7L-2515
Open : 239 °F (115 °C), Close : 212 °F (100 °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
750
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.
17
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Outdoor Unit CU-4KS24NBU
Control PCB
Part No.
Controls
CB-CU-4KS24NBU
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
5KD240XAB21 / 1,700W
FV50S ... 1.91 (900)
U - V : 0.720
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
Pints (cc)
V - W : 0.708
W - U : 0.726
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-7L-2515
Open : 239 °F (115 °C), Close : 212 °F (100 °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
750
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-4KS31NBU
Control PCB
Part No.
Controls
CB-CU-4KS31NBU
Microprocessor
250V 25A
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
5JD420XAB22 / 3,000W
FV50S ... 2.55 (1,200)
U - V : 0.435
Compressor Model / Nominal Output
Compressor Oil ... Amount
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
Pints (cc)
V - W : 0.441
W - U : 0.452
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-7L-2515
Open : 239 °F (115 °C), Close : 212 °F (100 °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
800
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)
7.75 (0.72)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
19
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2-3. Other Component Specifications
Quantity of Sensor
CU-4KS24NBU
Model No.
Sensor Name
of sensor
CU-3KS19NBU
CU-4KS31NBU
Outdoor air temp sensor
Outdoor heat exchanger sensor
AW / AN sensor
TKS295B
TKS292B
TKS292B
TKS292B
TKS292B
TKS292B
1
1
1
1
1
1
1 / 1
1 / 1
1 / 1
0
1 / 1
1 / 1
1 / 1
1 / 1
1 / 1
1 / 1
1 / 1
1 / 1
BW / BN sensor
CW / CN sensor
DW / DN sensor
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)(
-
-
Quantity of Sensor
CU-4KS24NBU
1
Model No.
of sensor
Sensor Name
CU-3KS19NBU
1
CU-4KS31NBU
1
Compressor temp sensor
TKS293B
200
180
160
140
120
100
80
60
40
20
0
32 50 68 86 104 122 140 158 176 194
(0) (10) (20)(30) (40) (50) (60)(70) (80) (90)
Temperature F ( C)
20
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3. DIMENSIONAL DATA
Outdoor Unit CU-3KS19NBU
23-15/16
5-11/32
15/32
11-17/32
35-7/16(900)
2-15/16
Wide tube service valve
dia.3/8" (9.52) × 3
Narrow tube service valve
dia.1/4" (6.35) × 3
2-1/32
4-1/2
1-13/16
2-1/16
Unit: inch(mm)
(852-0-0010-11500-0)
21
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Outdoor Unit
CU-4KS24NBU
23-15/16
5-11/32
15/32
11-17/32
35-7/16(900)
2-15/16
Wide tube service valve
dia.1/2" (12.70) × 1
Narrow tube service valve
dia.1/4" (6.35) × 4
Wide tube service valve
dia.3/8" (9.52) × 3
2-1/32
4-1/2
1-13/16
2-1/16
2-13/32
Unit: inch(mm)
(852-0-0010-20500-0)
22
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Outdoor Unit
CU-4KS31NBU
23-15/16
5-11/32
15/32
11-17/32
35-7/16(900)
2-15/16
Wide tube service valve
dia.1/2" (12.70) × 2
Narrow tube service valve
dia.1/4" (6.35) × 4
Wide tube service valve
dia.3/8" (9.52) × 2
2-1/32
4-1/2
1-13/16
2-1/16
2-13/32
Unit: inch(mm)
(852-0-0010-20600-0)
23
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4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
Outdoor Unit CU-3KS19NBU
Indoor unit
Outdoor unit
Service valve on
wide tube
CW
Wide tube
O.D.3/8"
Sub
Main
accumulator accumulator
BW
AW
O.D.3/8"
O.D.3/8"
High pressure
switch
Header
H.P.
Electric
expansion
valve
Service valve on
narrow tube
CN
M
M
M
Narrow tube
O.D.1/4"
BN
AN
O.D.1/4"
O.D.1/4"
Strainer
Header
Cooling cycle
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.
24
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Outdoor Unit CU-4KS24NBU
Indoor unit
Outdoor unit
Service valve on
wide tube
DW
Wide tube
O.D.1/2"
Sub
Main
accumulator accumulator
CW
BW
AW
O.D.3/8"
O.D.3/8"
O.D.3/8"
High pressure
switch
H.P.
Header
Electric
expansion
valve
Service valve on
narrow tube
M
Narrow tube
O.D.1/4"
DN
CN
BN
AN
M
M
M
O.D.1/4"
O.D.1/4"
O.D.1/4"
Strainer
Header
Cooling cycle
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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Outdoor Unit CU-4KS31NBU
Indoor unit
Outdoor unit
Service valve on
wide tube
DW
Wide tube
O.D.1/2"
Sub
Main
accumulator accumulator
CW
BW
AW
O.D.1/2"
O.D.3/8"
O.D.3/8"
High pressure
switch
H.P.
Header
Electric
expansion
valve
Service valve on
narrow tube
M
Narrow tube
O.D.1/4"
DN
CN
BN
AN
M
M
M
O.D.1/4"
O.D.1/4"
O.D.1/4"
Strainer
Header
Cooling cycle
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.
26
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5. PERFORMANCE DATA
5-1. Temperature Charts
5-1-1. Temperature Charts (CU-3KS19NBU)
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS7NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
188
(1.3)
174
(1.2)
160
(1.1)
146
(1.0)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
5
4
3
2
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6t (7.5m). If the tubing length is different, the performance chart will vary.
27
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
188
(1.3)
174
(1.2)
160
(1.1)
146
(1.0)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
28
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
29
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS18NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
HH fan
Lo fan
Hi fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
8
Lo fan
Hi fan
HH fan
7
6
5
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
30
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
6
Lo fan
Hi fan
HH fan
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
31
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
174
(1.2)
Lo fan
Hi fan
HH fan
160
(1.1)
146
(1.0)
132
(0.9)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
68.0(20)
Lo fan
Hi fan
HH fan
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
32
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Outdoor Unit CU-3KS19NBU Indoor Unit CS-KS18NB4UW × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
174
(1.2)
HH fan
Lo fan
Hi fan
160
(1.1)
146
(1.0)
132
(0.9)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
7
6
5
4
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
68.0(20)
Lo fan
Hi fan
HH fan
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
33
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5-1-2. Temperature Charts (CU-4KS24NBU)
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS7NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
188
(1.3)
174
(1.2)
160
(1.1)
146
(1.0)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
5
4
3
2
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6t (7.5m). If the tubing length is different, the performance chart will vary.
34
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
188
(1.3)
174
(1.2)
160
(1.1)
146
(1.0)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
35
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
36
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS18NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
HH fan
Lo fan
Hi fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
8
Lo fan
Hi fan
HH fan
7
6
5
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
37
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS24NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
9
HH fan
Lo fan
Hi fan
8
7
6
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
38
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
HH fan
174
(1.2)
160
(1.1)
146
(1.0)
132
(0.9)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
6
Lo fan
Hi fan
HH fan
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
39
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
174
(1.2)
Lo fan
Hi fan
HH fan
160
(1.1)
146
(1.0)
132
(0.9)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
6
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
68.0(20)
Lo fan
Hi fan
HH fan
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
40
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Outdoor Unit CU-4KS24NBU Indoor Unit CS-KS18NB4UW × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
174
(1.2)
HH fan
Lo fan
Hi fan
160
(1.1)
146
(1.0)
132
(0.9)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
HH fan
7
6
5
4
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
68.0(20)
Lo fan
Hi fan
HH fan
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
41
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5-1-3. Temperature Charts (CU-4KS31NBU)
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS7NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
Hi fan
HH fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
5
Lo fan
Hi fan
Hi fan
HH fan
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
42
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
Hi fan
HH fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
5
Lo fan
Hi fan
Hi fan
HH fan
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
43
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
Hi fan
HH fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
6
Lo fan
Hi fan
Hi fan
HH fan
5
4
3
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
44
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS18NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
9
Lo fan
Hi fan
8
7
6
5
4
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
45
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS24NKU × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
12
Lo fan
Hi fan
11
10
9
8
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
46
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
Hi fan
HH fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
Hi fan
HH fan
5
4
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
47
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NB4U × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
Hi fan
HH fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
Hi fan
HH fan
6
5
4
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
Lo fan
Hi fan
Hi fan
HH fan
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
46.4( 8)
42.8( 6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
48
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Outdoor Unit CU-4KS31NBU Indoor Unit CS-KS18NB4UW × 1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
Lo fan
Hi fan
174
(1.2)
146
(1.0)
118
(0.8)
90
(0.6)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(2) Operating current performance chart
Lo fan
Hi fan
9
8
7
6
5
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor air temperature °F (°C)
(3) Indoor discharge air performance chart
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)
39.2( 4)
77
86
(30)
95
(35)
104
(40)
(25)
Outdoor air temperature °F (°C)
NOTE
• This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on
the indoor unit type.
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
(In this case, be sure to stop all the indoor units where performance is not being checked.)
• The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
49
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5-2. Cooling Capacity
Outdoor Unit : CU-3KS19NBU
Indoor Unit
: CS-MKS9NKU × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
18,800 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
777 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
18,880
18,230
17,540
16,990
16,170
15,290
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
16,240
18,800
18,880
18,880
18,880
15,940
18,230
18,230
18,230
18,230
15,630
17,540
17,540
17,540
17,540
15,330
16,990
16,990
16,990
16,990
15,030
16,170
16,170
16,170
16,170
14,580
15,290
15,290
15,290
15,290
59
(15.0)
TC
19,800
19,130
18,420
17,880
17,030
16,120
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
13,220
15,940
18,650
19,800
19,800
12,920
15,630
18,350
19,130
19,130
12,620
15,330
18,050
18,420
18,420
12,470
15,030
17,880
17,880
17,880
12,010
14,730
17,030
17,030
17,030
11,710
14,430
16,120
16,120
16,120
63
(17.2)
TC
20,730
20,050
19,320
# 18,800
17,920
16,970
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
10,200
12,920
15,630
18,350
20,730
9,900
12,620
15,480
18,050
20,050
9,750
12,310
15,180
17,900
19,320
9,450
9,150
11,860
14,580
17,290
17,920
8,840
11,560
14,280
16,970
16,970
67
12,160
15,030
17,600
18,800
(19.4)
TC
21,650
20,970
20,220
19,730
18,830
17,850
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
7,030
9,750
6,880
9,450
6,580
9,300
6,430
6,130
8,690
5,830
8,390
71
9,000
(21.7)
12,470
15,180
17,900
12,310
15,030
17,600
12,010
14,730
17,440
11,860
14,580
17,140
11,560
14,280
16,840
11,260
13,970
16,540
TC
22,470
21,780
21,020
20,570
19,650
18,620
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,580
9,450
6,430
9,300
6,280
9,000
6,130
5,830
8,540
5,530
8,240
(23.9)
8,840
12,160
14,880
11,860
14,580
11,710
14,430
11,560
14,280
11,260
13,970
10,960
13,670
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.
50
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Outdoor Unit : CU-3KS19NBU
Indoor Unit : CS-MKS12NB4U × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
18,300 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
706 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
18,370
17,750
17,080
16,550
15,760
14,900
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,040
17,370
18,370
18,370
18,370
14,770
17,100
17,750
17,750
17,750
14,490
16,820
17,080
17,080
17,080
14,220
16,550
16,550
16,550
16,550
13,940
15,760
15,760
15,760
15,760
13,530
14,900
14,900
14,900
14,900
59
(15.0)
TC
19,260
18,620
17,930
17,410
16,590
15,710
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,430
14,770
17,230
19,260
19,260
12,160
14,490
16,960
18,620
18,620
11,890
14,220
16,690
17,930
17,930
11,610
13,940
16,410
17,410
17,410
11,340
13,670
16,140
16,590
16,590
10,930
13,260
15,710
15,710
15,710
63
(17.2)
TC
20,150
19,500
18,800
# 18,300
17,450
16,540
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,830
12,160
14,630
16,960
19,290
9,550
11,890
14,350
16,690
19,020
9,280
11,610
14,080
16,410
18,740
9,140
8,730
11,060
13,530
15,860
17,450
8,460
10,790
13,260
15,590
16,540
67
11,470
13,810
16,270
18,300
(19.4)
TC
21,050
20,390
19,670
19,200
18,330
17,390
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,950
9,280
6,810
9,140
6,540
8,870
6,400
5,990
8,320
5,710
8,040
71
8,730
(21.7)
11,750
14,080
16,410
11,470
13,940
16,270
11,340
13,670
16,000
11,060
13,530
15,860
10,790
13,120
15,450
10,510
12,850
15,180
TC
21,830
21,170
20,440
20,010
19,120
18,040
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,540
9,000
6,400
8,870
6,120
8,590
5,990
5,710
8,180
5,440
7,910
(23.9)
8,460
11,340
13,670
11,200
13,530
10,930
13,260
10,790
13,120
10,510
12,850
10,240
12,570
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.
51
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Outdoor Unit : CU-4KS24NBU
Indoor Unit : CS-MKS9NKU × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
25,400 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
777 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
25,520
24,880
23,960
23,340
18,890
14,000
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
19,410
21,970
24,840
25,520
25,520
19,100
21,670
24,530
24,880
24,880
18,650
21,220
23,960
23,960
23,960
18,350
20,910
23,340
23,340
23,340
16,240
18,800
18,890
18,890
18,890
13,970
14,000
14,000
14,000
14,000
59
(15.0)
TC
26,760
25,900
24,950
24,370
19,290
14,270
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
16,240
18,950
21,820
24,380
26,760
15,940
18,500
21,370
24,080
25,900
15,480
18,200
20,910
23,630
24,950
15,180
17,900
20,610
23,330
24,370
13,070
15,630
18,500
19,290
19,290
10,960
13,670
14,270
14,270
14,270
63
(17.2)
TC
27,750
26,880
25,910
# 25,400
19,630
14,500
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
13,070
15,780
18,500
21,220
23,930
12,620
15,330
18,200
20,760
23,480
12,310
14,880
17,750
20,460
23,180
12,010
14,730
17,600
20,160
22,880
9,750
12,470
15,330
17,900
19,630
7,940
10,660
13,370
14,500
14,500
67
(19.4)
TC
28,690
27,810
26,830
26,400
19,890
14,670
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,600
12,310
15,030
17,750
20,460
9,300
12,010
14,730
17,440
20,160
8,840
11,560
14,430
16,990
19,710
8,690
6,430
9,150
4,770
7,340
71
11,410
14,280
16,840
19,560
(21.7)
11,860
14,580
17,290
10,200
12,920
14,670
TC
29,440
28,560
27,580
26,850
20,020
14,760
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,000
11,710
14,430
17,140
8,690
11,410
14,130
16,840
8,240
11,110
13,820
16,390
8,090
5,830
8,690
4,320
7,190
9,750
12,470
(23.9)
10,810
13,520
16,240
11,410
13,970
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.
52
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Outdoor Unit : CU-4KS24NBU
Indoor Unit
: CS-KS18NB4UW + CS-MKS12NB4U + CS-MKS12NB4U
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
24,800 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
812 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
25,120
24,260
23,340
22,720
18,300
13,510
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
19,520
22,360
25,120
25,120
25,120
19,040
21,880
24,260
24,260
24,260
18,570
21,410
23,340
23,340
23,340
18,410
21,100
22,720
22,720
22,720
16,360
18,300
18,300
18,300
18,300
13,510
13,510
13,510
13,510
13,510
59
(15.0)
TC
26,160
25,290
24,340
23,760
18,710
13,790
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
16,210
19,040
21,880
24,720
26,160
15,890
18,730
21,570
24,410
25,290
15,420
18,260
21,100
23,930
24,340
15,260
17,940
20,940
23,620
23,760
13,050
15,890
18,710
18,710
18,710
11,160
13,790
13,790
13,790
13,790
63
(17.2)
TC
27,180
26,290
25,320
# 24,800
19,070
14,020
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,890
15,730
18,730
21,410
24,250
12,580
15,420
18,260
21,100
23,780
12,260
14,940
17,940
20,620
23,460
11,950
14,790
17,630
20,460
23,300
9,740
12,580
15,420
18,260
19,070
8,000
10,690
13,680
14,020
14,020
67
(19.4)
TC
28,150
27,250
26,260
25,820
19,350
14,210
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,420
12,260
15,100
17,940
20,780
9,110
11,950
14,790
17,630
20,310
8,790
11,470
14,470
17,310
19,990
8,630
6,430
9,110
4,690
7,530
71
11,320
14,310
17,150
19,830
(21.7)
12,100
14,790
17,630
10,370
13,210
14,210
TC
28,950
28,050
27,050
26,320
19,520
14,320
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,790
11,790
14,470
17,310
8,480
11,470
14,310
16,990
8,160
11,160
13,840
16,680
8,000
5,800
8,790
4,380
7,220
(23.9)
10,840
13,680
16,520
11,470
14,310
10,050
12,740
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.
53
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Outdoor Unit : CU-4KS31NBU
Indoor Unit : CS-MKS9NKU × 4
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
30,600 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
1,036 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
30,850
29,770
28,590
27,980
22,750
16,560
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
24,260
27,890
30,850
30,850
30,850
23,660
27,280
29,770
29,770
29,770
23,260
26,680
28,590
28,590
28,590
22,860
26,480
27,980
27,980
27,980
20,440
22,750
22,750
22,750
22,750
16,560
16,560
16,560
16,560
16,560
59
(15.0)
TC
32,150
31,030
29,820
29,290
23,300
16,930
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
20,040
23,660
27,480
30,900
32,150
19,640
23,260
26,880
30,500
31,030
19,030
22,660
26,480
29,820
29,820
18,830
22,450
26,080
29,290
29,290
16,420
19,840
23,300
23,300
23,300
13,800
16,930
16,930
16,930
16,930
63
(17.2)
TC
33,410
32,280
31,030
# 30,600
23,790
17,260
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,820
19,440
23,260
26,680
30,300
15,410
19,030
22,660
26,280
29,900
15,010
18,430
22,250
25,870
29,290
14,810
18,430
22,050
25,670
29,290
12,200
15,820
19,440
23,060
23,790
9,780
13,400
17,020
17,260
17,260
67
(19.4)
TC
34,630
33,470
32,190
31,890
24,200
17,520
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
11,390
15,010
18,830
22,250
25,870
10,990
14,610
18,230
21,850
25,470
10,590
14,210
17,830
21,450
25,070
10,380
14,010
17,830
21,250
24,870
7,770
11,390
15,010
18,630
22,250
5,560
9,180
71
(21.7)
13,000
16,420
17,520
TC
35,630
34,460
33,160
33,010
24,460
17,680
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
10,790
14,410
18,030
21,650
10,380
14,010
17,630
21,250
9,980
13,600
17,220
20,840
9,780
7,170
10,990
14,410
18,030
5,150
8,980
(23.9)
13,600
17,220
20,640
12,400
16,020
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.
54
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Outdoor Unit : CU-4KS31NBU
Indoor Unit : CS-MKS9NB4U × 4
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
28,600 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
883 CFM
INDOOR
ENT. TEMP. oF (oC)
WB
DB
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
28,830
27,880
26,840
26,270
21,300
15,500
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
22,560
25,810
28,830
28,830
28,830
22,210
25,470
27,880
27,880
27,880
21,700
24,960
26,840
26,840
26,840
21,360
24,610
26,270
26,270
26,270
19,130
21,300
21,300
21,300
21,300
15,500
15,500
15,500
15,500
15,500
59
(15.0)
TC
29,960
29,000
27,940
27,440
21,790
15,830
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
18,780
22,040
25,470
28,730
29,960
18,270
21,700
25,130
28,390
29,000
17,930
21,180
24,610
27,870
27,940
17,580
21,010
24,440
27,440
27,440
15,360
18,610
21,790
21,790
21,790
12,960
15,830
15,830
15,830
15,830
63
(17.2)
TC
31,060
30,090
29,010
# 28,600
22,220
16,110
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
14,840
18,100
21,530
24,780
28,210
14,500
17,760
21,180
24,440
27,700
13,980
17,410
20,840
24,100
27,360
13,810
17,240
20,670
23,930
27,180
11,410
14,670
18,100
21,360
22,220
9,180
12,440
15,870
16,110
16,110
67
(19.4)
TC
32,080
31,110
30,020
29,730
22,560
16,340
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
10,730
13,980
17,410
20,670
23,930
10,380
13,640
17,070
20,330
23,580
10,040
13,300
16,730
19,980
23,240
9,870
7,470
10,730
14,160
17,410
20,670
5,410
8,670
71
13,130
16,560
19,810
23,240
(21.7)
12,100
15,360
16,340
TC
32,920
31,940
30,850
30,690
22,770
16,470
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
10,040
13,470
16,730
19,980
9,700
13,130
16,380
19,640
9,360
12,780
16,040
19,300
9,360
6,780
10,210
13,470
16,730
4,900
8,330
(23.9)
12,780
16,040
19,300
11,760
15,010
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.
55
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5-3. Cooling Capacity (Low Ambient)
Outdoor Unit : CU-3KS19NBU
Indoor Unit
: CS-MKS9NKU × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
18,800 BTU/h
AIR FLOW RATE:
777 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
15
25
35
45
55
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
19,220
19,090
19,080
19,160
19,010
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
16,390
18,950
19,220
19,220
19,220
19,090
19,090
19,090
19,090
19,090
16,240
18,950
19,080
19,080
19,080
16,390
18,950
19,160
19,160
19,160
16,240
18,950
19,010
19,010
19,010
59
(15.0)
TC
19,620
19,540
19,610
19,780
19,680
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
13,220
15,780
18,650
19,620
19,620
19,540
19,540
19,540
19,540
19,540
13,070
15,780
18,650
19,610
19,610
13,220
15,940
18,650
19,780
19,780
13,220
15,780
18,650
19,680
19,680
63
(17.2)
TC
19,910
19,890
20,060
20,340
20,320
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,900
12,620
15,330
18,050
19,910
19,890
19,890
19,890
19,890
19,890
9,900
12,620
15,480
18,050
20,060
10,050
12,770
15,480
18,200
20,340
10,050
12,770
15,480
18,200
20,320
67
(19.4)
TC
20,060
20,120
20,400
20,830
20,890
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,430
9,150
12,010
14,580
17,290
20,120
20,120
20,120
20,120
20,120
6,580
9,300
12,160
14,730
17,440
6,730
9,450
12,310
14,880
17,600
6,730
9,450
12,310
14,880
17,600
71
(21.7)
TC
20,040
20,180
20,600
21,180
21,340
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
5,980
8,690
11,410
14,130
20,180
20,180
20,180
20,180
6,130
8,840
11,560
14,280
6,280
9,000
11,710
14,430
6,280
9,150
11,710
14,430
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.
56
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Outdoor Unit : CU-3KS19NBU
Indoor Unit : CS-MKS12NB4U × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
18,300 BTU/h
AIR FLOW RATE:
706 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
15
25
35
45
55
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
18,680
18,570
18,560
18,620
18,490
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,180
17,510
18,680
18,680
18,680
18,570
18,570
18,570
18,570
18,570
15,180
17,510
18,560
18,560
18,560
15,180
17,510
18,620
18,620
18,620
15,180
17,510
18,490
18,490
18,490
59
(15.0)
TC
19,020
18,960
19,030
19,180
19,100
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,300
14,630
17,100
19,020
19,020
18,960
18,960
18,960
18,960
18,960
12,300
14,770
17,100
19,030
19,030
12,430
14,770
17,230
19,180
19,180
12,430
14,770
17,230
19,100
19,100
63
(17.2)
TC
19,260
19,260
19,420
19,690
19,670
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,420
11,750
14,220
16,550
18,880
19,260
19,260
19,260
19,260
19,260
9,550
11,890
14,350
16,690
19,020
9,690
12,020
14,350
16,690
19,020
9,550
12,020
14,350
16,690
19,020
67
(19.4)
TC
19,360
19,430
19,700
20,110
20,170
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,400
8,730
11,200
13,530
15,860
19,430
19,430
19,430
19,430
19,430
6,540
8,870
11,340
13,670
16,000
6,670
9,000
11,470
13,810
16,140
6,670
9,000
11,470
13,810
16,140
71
(21.7)
TC
19,290
19,440
19,840
20,390
20,550
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
5,850
8,180
10,510
12,980
19,440
19,440
19,440
19,440
5,990
8,460
10,790
13,120
6,120
8,590
10,930
13,260
6,120
8,590
10,930
13,260
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.
57
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Outdoor Unit : CU-4KS24NBU
Indoor Unit : CS-MKS9NKU × 3
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
25,400 BTU/h
AIR FLOW RATE:
777 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
15
25
35
45
55
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
25,470
25,420
25,470
25,670
25,610
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
19,250
21,970
24,840
25,470
25,470
25,420
25,420
25,420
25,420
25,420
19,250
21,970
24,840
25,470
25,470
19,410
22,120
24,840
25,670
25,670
19,410
22,120
24,840
25,610
25,610
59
(15.0)
TC
25,540
25,590
25,780
26,160
26,210
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,780
18,350
21,220
23,930
25,540
25,590
25,590
25,590
25,590
25,590
15,780
18,500
21,370
23,930
25,780
15,940
18,650
21,520
24,080
26,160
16,090
18,650
21,520
24,230
26,210
63
(17.2)
TC
25,380
25,550
25,930
26,510
26,700
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,010
14,730
17,600
20,160
22,880
25,550
25,550
25,550
25,550
25,550
12,310
15,030
17,750
20,460
23,180
12,470
15,180
18,050
20,610
23,330
12,620
15,330
18,050
20,760
23,480
67
(19.4)
TC
24,930
25,240
25,840
26,690
27,040
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,240
10,960
13,670
16,390
19,100
25,240
25,240
25,240
25,240
25,240
8,540
11,260
13,970
16,690
19,410
8,840
11,560
14,280
16,990
19,710
9,000
11,710
14,430
17,140
19,860
71
(21.7)
TC
24,210
24,680
25,530
26,670
27,190
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
7,190
10,050
12,620
15,330
24,680
24,680
24,680
24,680
7,640
10,500
13,070
15,780
7,940
10,810
13,520
16,090
8,240
10,960
13,670
16,390
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.
58
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Outdoor Unit : CU-4KS24NBU
Indoor Unit
: CS-KS18NB4UW + CS-MKS12NB4U + CS-MKS12NB4U
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
24,800 BTU/h
AIR FLOW RATE:
812 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
15
25
35
45
55
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
24,890
24,830
24,880
25,090
25,020
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
19,360
22,200
24,890
24,890
24,890
24,830
24,830
24,830
24,830
24,830
19,360
22,200
24,880
24,880
24,880
19,520
22,200
25,090
25,090
25,090
19,520
22,200
25,020
25,020
25,020
59
(15.0)
TC
25,020
25,050
25,250
25,620
25,660
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,730
18,570
21,410
24,250
25,020
25,050
25,050
25,050
25,050
25,050
15,890
18,570
21,570
24,250
25,250
16,050
18,730
21,730
24,410
25,620
16,050
18,890
21,730
24,570
25,660
63
(17.2)
TC
24,930
25,080
25,450
26,030
26,200
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,100
14,790
17,780
20,460
23,300
25,080
25,080
25,080
25,080
25,080
12,260
15,100
17,940
20,780
23,460
12,420
15,260
18,260
20,940
23,780
12,580
15,420
18,260
21,100
23,780
67
(19.4)
TC
24,560
24,850
25,440
26,280
26,600
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,160
11,000
13,840
16,680
19,360
24,850
24,850
24,850
24,850
24,850
8,480
11,320
14,160
16,990
19,680
8,790
11,630
14,470
17,310
19,990
8,950
11,630
14,630
17,310
20,150
71
(21.7)
TC
23,930
24,370
25,200
26,320
26,810
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
7,220
10,050
12,890
15,730
24,370
24,370
24,370
24,370
7,690
10,530
13,370
16,050
8,000
10,840
13,680
16,520
8,160
11,000
13,840
16,680
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.
59
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Outdoor Unit : CU-4KS31NBU
Indoor Unit : CS-MKS9NKU × 4
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
30,600 BTU/h
0
AIR FLOW RATE:
1,036 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
5
15
25
35
45
55
(-17.8)
(-15.0)
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
30,870
30,760
30,800
31,010
30,890
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
24,260
27,890
30,870
30,870
30,870
30,760
30,760
30,760
30,760
30,760
24,260
27,890
30,800
30,800
30,800
24,260
27,890
31,010
31,010
31,010
24,260
27,890
30,890
30,890
30,890
59
(15.0)
TC
31,140
31,130
31,320
31,720
31,730
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
19,640
23,260
26,880
30,500
31,140
31,130
31,130
31,130
31,130
31,130
19,840
23,260
27,080
30,700
31,320
19,840
23,460
27,280
30,700
31,720
19,840
23,460
27,280
30,700
31,730
63
(17.2)
TC
31,150
31,270
31,660
32,300
32,450
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,010
18,630
22,250
25,870
29,490
31,270
31,270
31,270
31,270
31,270
15,210
18,830
22,450
26,080
29,700
15,410
19,030
22,860
26,280
29,900
15,610
19,030
22,860
26,480
29,900
67
(19.4)
TC
30,850
31,120
31,750
32,680
33,020
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
10,180
13,600
17,430
21,050
24,470
31,120
31,120
31,120
31,120
31,120
10,380
14,010
17,630
21,250
24,870
10,790
14,410
18,030
21,650
25,270
10,790
14,410
18,230
21,650
25,270
71
(21.7)
TC
30,230
30,670
31,570
32,820
33,340
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,980
12,600
16,220
19,840
30,670
30,670
30,670
30,670
9,380
13,200
16,620
20,240
9,780
13,600
17,020
20,640
9,980
13,600
17,220
20,840
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.
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Outdoor Unit : CU-4KS31NBU
Indoor Unit : CS-MKS9NB4U × 4
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
28,600 BTU/h
AIR FLOW RATE:
883 CFM
INDOOR
OUTDOOR
ENT. TEMP.oF (oC)
AMBIENT TEMP.oF (oC)
WB
DB
15
25
35
45
55
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
28,890
28,790
28,810
28,990
28,870
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
22,560
25,980
28,890
28,890
28,890
28,790
28,790
28,790
28,790
28,790
22,560
25,810
28,810
28,810
28,810
22,730
25,980
28,990
28,990
28,990
22,560
25,980
28,870
28,870
28,870
59
(15.0)
TC
29,170
29,150
29,320
29,660
29,650
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
18,440
21,700
25,130
28,390
29,170
29,150
29,150
29,150
29,150
29,150
18,440
21,700
25,130
28,390
29,320
18,610
21,870
25,300
28,560
29,660
18,610
21,870
25,300
28,560
29,650
63
(17.2)
TC
29,210
29,310
29,650
30,210
30,330
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
14,160
17,410
20,840
24,100
27,360
29,310
29,310
29,310
29,310
29,310
14,330
17,580
21,010
24,270
27,530
14,500
17,760
21,180
24,440
27,870
14,500
17,930
21,360
24,610
27,870
67
(19.4)
TC
28,970
29,200
29,760
30,580
30,860
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,700
12,960
16,380
19,640
22,900
29,200
29,200
29,200
29,200
29,200
9,870
13,130
16,560
19,810
23,240
10,210
13,470
16,900
20,160
23,410
10,210
13,640
17,070
20,330
23,580
71
(21.7)
TC
28,440
28,820
29,620
30,720
31,170
75
(23.9)
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,500
11,930
15,360
18,610
28,820
28,820
28,820
28,820
9,010
12,440
15,700
18,960
9,360
12,780
16,040
19,300
9,530
12,960
16,210
19,470
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.
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6. ELECTRICAL DATA
6-1. Electric Wiring Diagrams
Outdoor Unit CU-3KS19NBU
8FA2-5251-11800-1
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Outdoor Unit CU-4KS24NBU
8FA2-5251-11600-1
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Outdoor Unit CU-4KS31NBU
8FA2-5251-11400-1
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7. FUNCTIONS
7-1. Explanation of Functions
NOTE
The numerical values such as temperature, frequency, time and current in parentheses are an example
of CU-4KS31NBU and the values are different from the other models.
Control/conditions
INITIAL Breaker is ON.
Unit operation
Explanation
Power is supplied to the indoor and outdoor unit
control circuits, however the unit remains stopped.
Positioning of the outdoor unit electric expansion
valve is performed.
The ON/OFF operation
button on the remote
controller is pressed.
If automatic operation mode has been selected
with the remote controller, operation begins in
SENSOR DRY, or COOL mode depending
on the room temperature and
This applies in the case of automatic
COOL operation.
outdoor temperature at the time operation starts.
Depending on the operational mode, refer to the SENSOR DRY, or COOL item.
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Control/conditions
Unit operation
Explanation
COOL
The ON/OFF operation
button on the remote
controller is pressed.
The operation lamp illuminates.
The indoor fan operates at the set fan speed.
The outdoor unit stops.
The outdoor unit does not operate for 3 minutes
even after the breaker is turned ON.
The outdoor unit starts.
The frequency is increased at the rate of 0.5
Hz every 1 seconds.
(Compressor and the outdoor fan start.)
When the frequency reaches Hz,
frequency increases are stopped for a period
of seconds. (Refer to Table 1.)
This is in order to stabilize the return of oil to the
compressor.
The frequency then increases.
If the indoor and outdoor temperatures are high,
the current peak cut-off activates, stopping
any increases in frequency.
The room temperature
has reached the
The indoor temperature and the desired
temperature are approximately equal.
Operating frequency is stabilized in order to
maintain a comfortable environment.
desired temperature.
The thermostat turns
OFF.
The outdoor unit stops. (It does not stop if the
thermostart for another indoor unit is ON.)
The thermostat turns
ON again.
After the thermostat turns ON again, the
outdoor unit will not operate for 3 minutes,
even if the room temperature increases
above the desired temperature.
After 3 minutes, the outdoor unit begins operating
automatically.
During these 3 minutes, a pressure balance is
achieved, allowing the compressor to start
more easily.
Freeze prevention
When the temperature of the indoor heat
exchanger drops to approximately 35.6 °F
or below, the compressor turns OFF, the
outdoor fan turns OFF, and the indoor fan
continues operating with no changes.
In order to protect against freezing, the
compressor stops temporarily, until the
temperature of the indoor heat exchanger has
risen.
Approximately 3 minutes later, if the
temperature of the indoor heat exchanger
is adove 46.4 °F, the system returns to its
original conditions.
Stop
All indicator lamps turn OFF. The indoor and
outdoor units stop.
Operation is restarted
within 4 hours (only when (COOL) and with the same temperature
AUTO mode is selected
with the remote
controller).
Starts operating in the same operating mode
Within 4 hours after operation was stopped, it is
assumed that there has been no significant
change in the indoor and outdoor temperatures,
and the previous conditions (COOL) are stored.
settings as before operation was stopped.
Operation starts after 4
hours or more have
passed.
New operating mode is determined based on
the temperature conditions at the time the
ON/OFF operation button is pressed.
Frequency control
(Hz)
(senconds)
Outdoor air temperature is below 32 °F. Outdoor air temperature is 32 °F or higher.
(25) Hz
(35) Hz
(45) Hz
(55) Hz
(120) seconds
(60) seconds
(60) seconds
(180) seconds
(60) seconds
(30) seconds
(30) seconds
(90) seconds
Table 1
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(1/f fluctuation fan)
Control/conditions
Unit operation
Explanation
SENSOR The ON/OFF operation
DRY
The operation lamp illuminates.
The indoor fan operates at the set fan speed.
The outdoor unit stops.
The outdoor unit does not operate for 3 minutes
even after the breaker is turned ON.
button on the remote
controller is pressed.
The outdoor unit starts.
The frequency is increased at the rate of 0.5
Hz every 1 seconds.
(Compressor and the outdoor fan start.)
When the frequency reaches Hz,
frequency increases are stopped for a period
of seconds. (Refer to Table 1.)
This is in order to stabilize the return of oil to the
compressor.
The frequency then increases.
If the indoor and outdoor temperatures are high,
the current peak cut-off activates, stopping
any increases in frequency.
The room temperature
reaches the desired
temperature, and there
is no need for further
cooling.
DRY operation starts
Operating frequency is stabilized in order to
maintain a comfortable environment.
DRY A operation
The indoor fan changes between "Low"
and "LL" (very low) over a 6-minute cycle.
This is 1/f fluctuation fan operation.
(Refer to Fig. 1.)
Operates to effectively dehumidify the air while
not excessively reducing the indoor
temperature.
The indoor unit operates at 1/f fluctuation fan
operation, at a fan speed that does not cause
a chilly feeling.
The room temperature is
59 °F or higher, and is
slightly too cold.
DRY B operation
(1) The indoor fan changes between "Low"
and "LL" (very low) over a 6-minute cycle.
This is 1/f fluctuation fan operation.
The compressor operates on a 3-minutes ON,
6-minutes OFF cycle, to prevent the room
temperature from dropping too much.
(2) After appoximately 3 minutes, the
compressor turns OFF, the outdoor fan
turns OFF, and the indoor fan turns OFF.
(3) After approximately 6 minutes, the
conditions return to (1).
The room temperature is
below 59 °F.
Monitoring operation begins.
When monitoring operation begins, the
compressor stops, and the indoor fan operates at
"LL" (very low) speed.
1/f fluctuation fan
250
200
150
100
50
(Step)
0
6-minute cycle
Fig. 1
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< Low Ambient Cooling Operation >
When the outdoor air temperature reaches 57.2 °F (14 °C ) or less during the cooling operation,
the operation mode is switched to low ambient cooling operation.
When the mode is switched from cooling opration to low ambient cooling operation,
the compressor is stopped for 150 seconds temporarily.
When the mode has been switched to low ambient cooling operation,
the outdoor fan speed is lowered as the outdoor air temperature falls.
32 °F ( °C )
Outdoor air temperature
When the outdoor air temperature reaches 62.6 °F (17 °C ) or more during the low ambient
cooling operation, the operation mode is switched to cooling operation.
The following protective actions are available to prevent the compressor from operating
with abnormal loads.
At that time, they initiate thermo-off ( stopping the outdoor unit ) of the air conditioner.
Outdoor air temp.
°F ( °C )
14 (-10)
8.6 (-13)
Compressor
Indoor fan
OFF
ON
ON
ON
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7-2. Protective Functions
NOTE
The numerical values such as temperature, frequency, time and current in parentheses are an example
of CU-4KS31NBU and the values are different from the other models.
7-2-1. Current Control
The operating current may rise as a result of causes including increasing cooling loads or decreases in power
voltage. In these cases, the operating frequency is automatically reduced, or operation is stopped, in order to control
the operating current so that it is (20 A) or less.
As a result:
• Power breakers and fuses will not be tripped.
• Operation can continue during this period with somewhat reduced cooling capacity.
• Operation at normal capacity is restored when the cause of the current rise is eliminated.
Description of function
Example of operation for cooling
(20A)
(17A)
Power Point C
Point B
(16.6A)
Point A
Target
frequency
Frequency
Stops operation
Approx.3 minutes
• Operates at the target frequency at Point A and below.
• Stops increases to the frequency between Points A and B.
• Reduces the frequency by 1 Hz per 0.5 seconds when Point B is exceeded.
• Stops operation, and restarts it appoximately 3 minutes later, if Point C is exceeded.
(May operate when sudden voltage fluctuations occur. Indicates trouble.)
(1) Automatic frequency control
The operating frequency is reduced automatically, or operation is stopped, in order to control the operating
current so that it is at or below the values shown in the table below.
(20A)
COOL
Point C (peak cut trip)
(20.0)
(17.0)
(16.6)
Point B (Hz reduction)
Point A (Hz increase prohibit)
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(2) Current control
The operating frequency upper limits shown in the figure below are established for frequency reduction and
increase-prohibit.
Current(A)
Trip
Example of operation during cooling
Hz reduction
Hz increase prohibit
Hz reduction
Hz increase
prohibit
Hz reduction
Hz increase prohibit
(16)
(15.6)
Frequency (Hz)
0
(30)
7-2-2. Low Start Current
Operation starts at (8 Hz), and the start current is less than the normal operating current. This prevents the flickering
of fluorescent lights or television screens that occurs when ordinary A/C units start.
7-2-3. Compressor Temperature Control
To protect the compressor coil from overheating, the operating frequency is controlled based on the compressor
discharge temperature.
(°F)
Trip
(230)
5Hz every 30 sec. reduction
(223)
2Hz every 30 sec. reduction
(212)
Increase
prohibit range
No control
(Hz reduction)
(194)
* Within the increase-prohibit range, the range changes
to the Hz reduction range (2 Hz every 30 seconds) if
the compressor temperature rises by 4 °F.
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8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
8-1. Precautions before Performing Inspection or Repair
Both the indoor unit and outdoor unit include electronic control circuits.
Be sure to pay attention to the following before inspecting or repairing the
outdoor-side electronic circuits.
High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an
electrical charge (charging voltage DC 311 V) 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 control circuit board Power Lamp (red) turns OFF.
If the outdoor control circuit board is normal, approximately 180 seconds will be required for the charge to
dissipate. However, allow at least 30 minutes for the charge to dissipate if it is thought there might be trouble
with the outdoor control circuit board.
For example, if the outdoor control circuit board fuse has blown, approximately 30 minutes will be required to
discharge the high-capacity electrolytic capacitors.
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8-2. Trouble Diagnosis by Error Monitor Lamps
To prevent electric shock, do not inspect or repair until the Power Lamp on
the P.C.Board is turned off.
Warning
8-2-1. Location of the Error Monitor Lamps
Remove the top plate of outdoor unit and the cover of Electrical Component Box.
The Power Lamp and Error Monitor Lamps are located on the P.C.Board of Electrical Component Box. (Fig.1)
Heat Exchanger
Rear side
P.C.Board of Electrical Component Box.
Error Monitor Lamps
Power Lamp
ERR0
Front side
ERR1
ERR2
ERR3
Fig.1 View from top
8-2-2. Display of the Error Monitor Lamps
If a protective device has activated or there is a sensor failure in the outdoor unit, the 4 error monitor lamps on the
outdoor control circuit board will indicate the nature of the trouble.
: ON
: OFF
Error Monitor Lamp
Error Contents
ERR0 ERR1 ERR2 ERR3
Sensor for compressor discharge temp
Sensor for heat excharge temp
Sensor for branch pipe A (Narrow tube)
Sensor for branch pipe B (Narrow tube)
Sensor for branch pipe C (Narrow tube)
Sensor for branch pipe D (Narrow tube)
Outdoor temp sensor
Sensor for branch pipe A (Wide tube)
Sensor for branch pipe B (Wide tube)
Sensor for branch pipe C (Wide tube)
Sensor for branch pipe D (Wide tube)
HIC circuit trouble (current, temp)
Actuation of comp over load relay
Actuation of freeze protection function
Outdoor unit error. Detail of error message indicate on indoor LED
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8-3. Checking the Outdoor System
8-3-1. Checking the outdoor unit
No.
1
Work procedure
Check items (unit operation)
• Apply 220 V AC between terminals L1 and L2 on the
outdoor unit terminal plate.
• The LED (red) on the control board must illuminate.
2
• Short-circuit the T-RUN terminal to the COM terminal
of TEST/T-RUN terminals.
• The compressor and fan motor must turn ON.
(They turn ON about (70) seconds later after the power
is turned ON.)
NOTE
If the above check items are okay, but the outdoor unit does not operate, there may be a faulty
connection between the indoor unit and the outdoor unit.
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8-4. Trouble Diagnosis of Each Part
8-4-1. Problems of Each Part and Inspection Points
For details about the inspection points, refer to the Inspection Points for Each Part.
Indoor unit
Outdoor unit
Others
Problems
No. of
Inspection
Points for
Each part
Inspection
points
Self-Diagnostics check
Indoor controller
(control unit)
Indoor fan motor
Room temperature
sensor
Heat exchanger
temperature sensor
Inter-unit cable
Switch circuit board
Outdoor control circuit
board
(1)
Diode module
HIC
Electrolytic capacitor
Fuse
(2)
(3)
(4)
Compressor
Compressor protective
sensor
Outdoor fan motor
Coil thermistor
(5)
(6)
(7)
Electric expansion valve
Branch tubing
temperature sensor
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Indoor unit
Outdoor unit
Others
Problems
No. of
Inspection
Points for
Each part
Inspection
points
Breaker
(8)
(9)
Refrigerant gas pressure
8-4-2. Inspection Points for Each Part
(1) Outdoor control circuit board
Refer to 8-3-1. Checking the outdoor unit.
NOTE Do not remove or insert the outdoor control circuit board connector when power is being supplied to it.
(The controller will be damaged.)
(2) Fuse
Check it visually or the continuity with a tester.
(3) Compressor
Check for an open circuit in the compressor coil winding.
(4) Compressor protective sensor (compressor discharge temperature thermistor)
Check that the senseor is securely contained in the thermostart holder.
(5) Coil thermistor
Check that the sensor is securely contained in the thermostat holder.
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(6) Electric expansion valve
When replacing the electric expansion valve and coil, be sure to attach the connectors in the correct positions.
Labels are applied to the valve body and coil, corresponding to the connector colors, to identify them.
Use a multi-meter to measure the voltage (12 V).
Controller check
When the power is turned ON, the needle will move in the
following seguence in approximately 10 to 20 seconds for
each point.
No voltage on circuit board
Voltage varies
Model No.
Sequence
CU-3KS19NBU
MV0
MV0
MV1 MV2
CU-4KS24NBU
CU-4KS31NBU
MV1
MV2
MV3
Check the coil resistance.
Check the resistance between the gray lead
wire and the other wires.
Check the illumination
of the red Power Lamp.
Resistance is OK if it is 46 + / – 4ohm at 68 °F
0 ohm
Approx. 46 +/– 4 ohm
Replace the controller.
*1
Use the special service magnet and
rotate 5 revolutions clockwise to fully
close the valve.
Then start the unit and measure the
temperature at the inlet and outlet
tubes of the electric expansion valve.
If the temperature difference is large,
the valve is closed.
NOTE
Replace the coil.
Open and close the
electric expansion valve
by hand to check it.
Cool the main unit with
a damp cloth or other
means while welding.
When applying
vacuum, use the
special service magnet
and rotate at least 5
revolutions
No temperature change
Temperature changes
Then rotate 5 revolutions
counterclockwise to open the valve.
Operation is normal if the temperature
difference between the 2 tubes drops.
Replace the electric
expansion valve.
This part is normal.
Check elsewhere.
counterclockwise to
fully open the electric
expansion valve.
*1 If you have manually checked the electric expansion valve, be sure to reapply the outdoor power after you have
replaced the wiring. (The position of the elecric expansion valve will changed.)
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(7) Branch tubing temperature sensor
Check that the sensor is securely contained in the thermostat holder.
(8) Breaker
Check whether or not the breaker has been tripped.
Check that the breakers and fuses used are of the specified capacity.
Check that the breaker and its line are exclusive for A/C use.
(9) Refrigerant gas pressure
Start a COOL test run, and messure the temperatures of the A/C intake air and discharge air. Compare the values
with the performance charts.
If the values are higher than the performance charts:
Check for refrigerant shortage or blockage of the refrigerant circuit.
< Assessment of refrigerant shortage >
1. The pressure in the low-pressure section is 5 MPa or more below the value in the performance charts.
2. There is little condensation on the indoor heart exchanger, which overall appears dry.
< Distinguishing between refrigerant shortage and refrigerant circuit blockage >
If the pressure in the low-pressure section does not change when the circuit is charged 2 to 3 times with
refrigerant gas (0.44 lbs each time), or if the change is small, then the problem may not be
refrigerant shortage.
The problem may be a blockage of the refrigerant circuit.
1. Check that there is no internal leakage inside the 4-way valve:
At the low-pressure side tubing, check that there is no temperature difference between the intake and
discharge of the 4-way valve.
2. Check that the electric expansion valve is not blocked. Check as described on the preceding page.
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8-5. Trouble Diagnosis of 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 of indoor unit.
(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.
Important:
[Trouble symptom 1] The fan does not stop when the outdoor unit stops. Outdoor unit controller trouble
[Trouble symptom 2] The fan motor does not rotate when the outdoor unit is operating.
(Diagnostic procedure)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor
unit controller (3 locations).
Measurement location
Normal value
(1) 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
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
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.
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9. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
9-1. Characteristics of New Refrigerant R410A
9-1-1. 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.
9-1-2. Components (mixing proportions)
HFC32 (50%) / HFC125 (50%)
9-1-3. 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
CAUTION
from the mineral oil used for R22. Thus more attention to moisture prevention and
faster replacement work compared with conventional models are required.
79
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9-2. 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.
80
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9-3. 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"
9-4. 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.
81
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9-5. 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 "9-3. Tools Specifically
for R410A."
9-5-1. 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
82
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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.
Never charge a large amount
CAUTION
Liquid
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
83
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9-6. In Case Refrigerant is Leaking
Never attempt to charge additional refrigerant when refrigerant has been leaking
CAUTION
from the unit. Follow the procedure described below to locate points of leaks and
carry out repairs, then recharge the refrigerant.
(1) Detecting Leaks
Use the detector for R410A to locate refrigerant leak
points.
(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.
Do not reuse the recovered refrigerant because its
composition will have been altered.
(2) Recover refrigerant
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."
84
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9-7. Charging Additional Refrigerant
9-7-1. 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
CAUTION
instructions given in "9-6. In Case Refrigerant is Leaking" and completely carry out
repairs. Only then should you recharge the refrigerant.
9-8. Retro-Fitting Existing Systems
9-8-1. 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.
9-8-2. 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.
85
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APPENDIX A INSTALLATION INSTRUCTIONS
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
(852-6-4190-581-00-1)
A-1
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For Outdoor Unit
INSTALLATION INSTRUCTIONS
Split System Air Conditioner
Contents
This air conditioner uses the refrigerant R410A.
Page
IMPORTANT!
NOTE
External diameter of service port R410A: 5/16"
Please Read Before Starting .................................. 2
1. GENERAL .......................................................... 4
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
Model Combinations
Combine indoor and outdoor units only as listed
below.
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation
Model No.
2. INSTALLATION SITE SELECTION ................... 5
2-1. Indoor Unit
Indoor Unit
Outdoor Unit
CS-MKS7NKU
CS-MKS9NKU
CS-MKS12NKU
CS-MKS18NKU
CS-MKS24NKU
CS-MKS9NB4U
CS-MKS12NB4U
CS-KS18NB4UW
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
2-2. Connecting Indoor Units
2-3. Outdoor Unit
2-4. Baffle Plate for the Outdoor Unit
2-5. Outer Dimensions of Outdoor Unit
2-6. Diagram of Outdoor Unit Installation
3. INSTALLATION PROCESS .............................. 16
3-1. Embedding the Tubing and Wiring
3-2. Use of the Flaring Method
3-3. Flaring Procedure with a Flare Tool
3-4. Caution before Connecting Tubes Tightly
3-5. Tubing Connections
3-6. Insulation of Refrigerant Tubing
3-7. Taping the Tubes
Power Source:
60 Hz, single-phase, 230 / 208 VAC
3-8. Finishing the Installation
4. AIR PURGING................................................... 19
ꢀ Air Purging with a Vacuum Pump (for Test Run)
ꢀ Pump Down
5. WIRING INSTRUCTIONS ................................ 22
5-1. General Precautions on Wiring
Combination example
Indoor unit B
5-2. Recommended Wire Length and Diameter
5-3. Wiring System Diagram
5-4. How to Connect Wiring to the Terminal
5-5. Wiring Instructions for the Outdoor Unit
Indoor unit A
Indoor unit C
6. TEST RUN......................................................... 26
7. CONNECTING A HOME AUTOMATION
DEVICE ............................................................. 27
8. INSTALLATION CHECK SHEET ...................... 27
Outdoor unit
Indoor unit D
85264190581001 2011
CV6233187761
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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.
…In a Room
This symbol refers to a hazard
or unsafe practice which can
result in severe personal injury
or death.
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
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.
‡ *URXQGꢀWKHꢀXQLW following local electrical codes.
‡ &RQQHFWꢀDOOꢀZLULQJꢀWLJKWO\ꢁꢀ/RRVHꢀZLULQJꢀPD\ꢀFDXVHꢀRYHUꢂ
heating at connection points and a possible fire hazard.
‡ 7RꢀSUHYHQWꢀSRVVLEOHꢀKD]DUGVꢀIURPꢀLQVXODWLRQꢀIDLOXUHꢃ
the unit must be grounded.
rant cycle.
WARNING
‡ 5HIULJHUDQWꢀJDVꢀOHDNDJHꢀPD\
cause fire.
‡ '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
‡ 9HQWLODWHꢀDQ\ꢀHQFORVHGꢀDUHDVꢀZKHQꢀLQVWDOOLQJꢀRUꢀWHVWLQJ
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.
‡ &KHFNꢀFDUHIXOO\ꢀIRUꢀOHDNVꢀEHIRUHꢀVWDUWLQJꢀWKHꢀWHVWꢀUXQꢁ
‡ '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.
‡ 'RꢀQRWꢀLQVWDOOꢀRQO\ꢀDꢀVLQJOHꢀLQGRRUꢀXQLWꢁ
‡ 'RꢀQRWꢀWRXFKꢀWKHꢀDLUꢀLQOHWꢀRUꢀWKHꢀVKDUSꢀDOXPLQXPꢀ
fins of the outdoor unit. You may get injured.
‡ .HHSꢀ\RXUꢀILQJHUVꢀDQGꢀFORWKLQJꢀDZD\ꢀIURPꢀDQ\ꢀPRYLQJ
‡ 'RꢀQRWꢀVLWꢀRUꢀVWHSꢀRQꢀWKHꢀXQLWꢃꢀ\RXꢀPD\ꢀIDOOꢀGRZQ
parts.
accidentally.
‡ &OHDQꢀXSꢀWKHꢀVLWHꢀDIWHUꢀ\RXꢀILQLVKꢃꢀUHPHPEHULQJꢀWRꢀFKHFN
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
‡ 'RꢀQRWꢀVWLFNꢀDQ\ꢀREMHFWꢀLQWRꢀWKHꢀ)$1ꢀ&$6(ꢁ
You may be injured and the unit may be damaged.
NOTE
The illustrations are based on the typical appearance of
a standard model. Consequently, the shape may differ
from that of the air conditioner that you are installing.
3
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1. General
This booklet briefly outlines where and how to install the air conditioning system. Please read over the entire set of instruc-
tions for the indoor and outdoor units and make sure all accessory parts listed are with the system before beginning.
If the electric wiring diagram does not appear in this manual, please check for the diagram on the indoor unit.
1-1. Tools Required for Installation (not supplied)
1. Standard screwdriver
2. Phillips head screwdriver
3. Knife or wire stripper
4. Tape measure
5. Carpenter’s level
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
11. Tube cutter
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
16. Vacuum pump (For R410A)
17. Manifold valve
1-2. Accessories Supplied with Unit
Table 1
Parts
Figure
Q’ty
Parts
Figure
Q’ty
Parts
Reducer
Figure
Q’ty
1
CU-4KS24NBU
Labels for inter-unit
cable and tube
4 each Cushion rubber
1
4
A B C D
(1/2" 3/8")
CU-4KS31NBU
2
Packed in the outdoor unit.
Reducer
CU-3KS19NBU
(3/8" 1/2")
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.
1-4. Type of Copper Tube and Insulation Material
Refer to 5. Wiring Instructions for details.
If you wish to purchase these materials separately from
a local source, you will need:
Check local electrical codes
CAUTION
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.
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
Wide Tube
Model
Outer Dia.
Thickness
Outer Dia.
Thickness
CS-MKS7NKU, CS-MKS9NKU, CS-MKS12NKU
CS-MKS18NKU
1/4" (6.35 mm)
1/4" (6.35 mm)
1/4" (6.35 mm)
1/4" (6.35 mm)
1/4" (6.35 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
3/8" (9.52 mm)
1/2" (12.70 mm)
5/8" (15.88 mm)
3/8" (9.52 mm)
1/2" (12.70 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
0.0393" (1.0 mm)
0.0314" (0.8 mm)
0.0314" (0.8 mm)
CS-MKS24NKU
CS-MKS9NB4U, CS-MKS12NB4U
CS-KS18NB4UW
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
4
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2. Installation Site Selection
Indoor unit
2-1. Indoor Unit
To prevent abnormal heat generation
WARNING
and the possibility of fire, do not
place obstacles, enclosures and
grilles in front of or surrounding the
air conditioner in a way that may
block air flow.
Drain hose
AVOID:
ꢁ direct sunlight.
Outside drainage
Fig. 1
ꢁ nearby heat sources that may affect performance of the
unit.
For wall-mounted units
ꢁ areas where leakage of flammable gas may be expected.
ꢁ placing or allowing any obstructions near the air conditioner
6" (15 cm)
min.
inlet or outlet.
2" (5 cm)
min.
2" (5 cm)
min.
ꢁ installing in rooms that contain instant-on (rapid-start)
fluorescent lamps. (These may prevent the air conditioner
from receiving signals.)
Front View
ꢁ places where large amounts of oil mist exist.
Fig. 2a
ꢁ installing in locations where there are devices that
generate high-frequency emissions.
For ceiling-mounted cassette units
DO:
ꢁ select an appropriate position from which every corner of
the room can be uniformly air-conditioned. (High on a wall
is best for wall-mounted types.)
3.3 ft.
(1m)
3.3 ft.
(1m)
ꢁ select a location that will hold the weight of the unit.
3.3 ft.
(1m)
3.3 ft.
(1m)
3.3 ft.
(1m)
ꢁ select a location where tubing and drain hose have the
shortest run to the outside. (Fig. 1)
ꢁ allow room for operation and maintenance as well as
Fig. 2b
unrestricted air flow around the unit. (Fig. 2a or 2b)
ꢁ install the unit within the maximum elevation difference
(H1, H2, H3, H4) above or below the outdoor unit and
within a total tubing length (L1+L2+L3, L1+L2+L3+L4)
from the outdoor unit as detailed in Table 3 and Fig. 3a.
CAUTION
‡ $LUꢀGHOLYHU\ꢀIURPꢀDꢀFHLOLQJꢁ
mounted cassette unit will
be degraded if the distance
from the floor to the ceiling
is greater than 10 ft. (3 m).
Indoor unit
Tubing length (L1)
INDOOR
UNIT (1)
Wall
INDOOR
UNIT (2)
‡ )RUꢀVWDEOHꢀRSHUDWLRQꢀRIꢀWKH
air conditioner, do not install
wall-mounted units less
than 5' (1.5 m) from floor
level. (Fig. 3b)
Elevation
L2
L3
difference (H1) OUTDOOR
UNIT
Minimum height
from floor level
5' (1.5 m)
H2
H3
INDOOR
UNIT (3)
H4
INDOOR
L4
UNIT (4)
Floor level
Fig. 3a
Fig. 3b
5
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ꢁ install the indoor unit more than 3.3' (1 m) away from any
antenna or power lines or connecting wires used for tele-
vision, radio, telephone, security system, or intercom.
Electrical noise from any of these sources may affect
operation.
ꢁ install in a sturdy manner to avoid increased operating
noise.
Table 3
Max.
Allowable
Tubing Length
Per Unit
Max. Allowable Total
Tubing Length
at Shipment
Limit of
Total Tubing Length
(L1+L2+L3) or
(L1+L2+L3+L4)
(ft.)
Limit of Elevation
Difference
(H1, H2, H3, H4)
(ft.)
Required Amount
of Additional
Refrigerant
Model
(L1+L2+L3) or
(L1+L2+L3+L4)
(ft.)
(oz./ft.)*
(ft.)
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
82
82
150 (L1+L2+L3)
150 (L1+L2+L3)
50
50
50
—
150 (L1+L2+L3+L4)
150 (L1+L2+L3+L4)
200 (L1+L2+L3+L4)
230 (L1+L2+L3+L4)
0.22
0.22
100
* If total tubing length becomes 150 to 200 ft. (Max.) or 150 to 230 ft. (Max.), charge additional refrigerant (R410A) by 0.22 oz./ft.
No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.
6
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2-2. Connecting Indoor Units
Figures (4a) – (4k) show the different types of indoor unit connections, including the use of a reducer.
To select the required indoor unit to be connected, refer to the Combination Table that was included in the
outdoor unit package.
(1) Connecting indoor unit for CU-3KS19NBU
(A)
Outdoor unit
Indoor unit
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
C
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4a
(B)
Outdoor unit
Indoor unit
3/8"(9.52mm
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
C
3/8"(9.52mm
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
3/8"(9.52mm
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
B
A
3/8"(9.52mm
3/8"(9.52mm
1/2"(12.70mm
)
(CS-MKS18NKU)
(CS-KS18NB4UW)
Flare 3/8"(9.52mm
)
Union 1/2"(12.70mm)
A joint for connecting tubes of
different sizes
(3/8"(9.52mm
)
1/2"(12.70mm)) Supplied Reducer
Fig. 4b
(2) Connecting indoor unit for CU-4KS24NBU
(A)
(1/2"(12.70mm
)
3/8"(9.52mm)) Supplied Reducer
Union 3/8"(9.52mm
Indoor unit
Flare 1/2"(12.70mm
)
)
Outdoor unit
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
D
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
)
C
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4c
7
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(B)
Outdoor unit
Indoor unit
1/2"(12.70mm
)
D
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
)
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
C
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4d
(C)
(1/2"(12.70mm
)
5/8"(15.88mm)) Locally purchased
Union 5/8"(15.88mm
Flare 1/2"(12.70mm
)
)
Outdoor unit
D
Indoor unit
5/8"(15.88mm
)
(CS-MKS24NKU)
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
)
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
C
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4e
(D)
(3/8"(9.52mm
)
1/2"(12.70mm))
Locally purchased
Flare 3/8"(9.52mm Union 1/2"(12.70mm
)
)
Outdoor unit
D
Indoor unit
1/2"(12.70mm
)
)
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
)
1/2"(12.70mm
C
B
A
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/4"(6.35mm
)
)
)
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
1/4"(6.35mm
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4f
8
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(3) Connecting indoor unit for CU-4KS31NBU
(A)
(1/2"(12.70mm
)
3/8"(9.52mm)) Supplied Reducer
Union 3/8"(9.52mm
Flare 1/2"(12.70mm
)
)
Outdoor unit
Indoor unit
3/8"(9.52mm
)
D
C
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/2"(12.70mm
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
)
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
)
)
)
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
1/4"(6.35mm
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4g
(B)
(1/2"(12.70mm 3/8"(9.52mm)) Supplied Reducer
Flare 1/2"(12.70mm Union 3/8"(9.52mm
Outdoor unit
)
)
Indoor unit
1/2"(12.70mm
)
D
C
B
A
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/2"(12.70mm
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
)
3/8"(9.52mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
)
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
1/4"(6.35mm
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4h
(C)
Outdoor unit
Indoor unit
1/2"(12.70mm
)
D
C
B
A
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/2"(12.70mm
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
)
)
)
1/2"(12.70mm
)
(CS-MKS18NKU)
(CS-KS18NB4UW)
3/8"(9.52mm
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
3/8"(9.52mm
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4i
9
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(D)
(1/2"(12.70mm
)
5/8"(15.88mm))Locally purchased
Flare 1/2"(12.70mm) Union 5/8"(15.88mm
)
Outdoor unit
D
Indoor unit
5/8"(15.88mm
)
(CS-MKS24NKU)
1/2"(12.70mm
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
)
)
3/8"(9.52mm
)
)
C
B
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
3/8"(9.52mm
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
)
3/8"(9.52mm
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/4"(6.35mm
Flare 1/2"(12.70mm
(1/2"(12.70mm
)
)
Union 3/8"(9.52mm)
)
3/8"(9.52mm))Supplied Reducer
Fig. 4j
(E)
(1/2"(12.70mm
Flare 1/2"(12.70mm
Outdoor unit
)
5/8"(15.88mm)) Locally purchased
Union 5/8"(15.88mm
)
)
Indoor unit
5/8"(15.88mm
)
D
C
B
A
(CS-MKS24NKU)
1/2"(12.70mm
1/2"(12.70mm
3/8"(9.52mm
3/8"(9.52mm
)
)
)
)
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
1/4"(6.35mm
)
1/2"(12.70mm
)
(CS-MKS18NKU)
(CS-KS18NB4UW)
)
)
)
3/8"(9.52mm
)
)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
3/8"(9.52mm
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
Fig. 4k
10
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2-3. Outdoor Unit
Exhaust fan
NO
AVOID:
Hot air
ꢁ heat sources, exhaust fans, etc. (Fig. 5a)
ꢁ damp, humid or uneven locations.
DO:
Heat source
Outdoor unit
Obstacle above
Min.
ꢁ choose a place as cool as possible.
ꢁ choose a place that is well ventilated.
Min.
7' (2 m)
7' (2 m)
ꢁ install in a location where at least two sides are unob-
structed, so that the flow of air at the intake port or
exhaust port is not blocked, and so that sufficient
space is ensured for maintenance to be carried out
without trouble. In general the top also must be unob-
structed. (Fig. 5b)
Fig. 5a
Air intake
Min. 8" (20 cm) Valve
side
Min. 10"
(25 cm)
Min.
Air discharge
Min.
4" (10 cm)
1’8" (50 cm)
Ground
Min. 8" (20 cm)
Air intake
ꢁ provide a solid base (level concrete pad, concrete block,
6" ꢀ 1'4" (15 ꢀ 40 cm) beams or equal), a minimum of 6"
(15 cm) above ground level to reduce humidity and
protect the unit against possible water damage and
decreased service life. (Figs. 5c and 5d)
Fig. 5b
Drain holes
Fig. 5c
A solid base must not cover
the hole of the bottom plate.
CAUTION
Anchor bolts
(4 pcs.)
ꢁ install cushion rubber under unit’s feet to reduce vibration
and noise. (Fig. 5e)
Min. 6" (15 cm)
Air intake
ꢁ use lug bolts or equal to bolt down unit, reducing vibration
and noise.
Concrete
or equal
ꢁ install in a location where no antenna of a television or
radio exists within 10' (3 m).
2-4. Baffle Plate for the Outdoor Unit
Fig. 5d
NOTE
It is recommended to use baffle plates.
When the outdoor unit is installed in a position exposed to
strong wind (such as seasonal winds with low air tempera-
ture in winter), baffle plates must be installed on the outdoor
unit. (Fig. 5f)
This unit is designed so that the fan of the outdoor unit runs
at low speed when the air conditioner is operated at low
outdoor air temperatures. When the outdoor unit is exposed
to strong wind, the system pressure drops because of the
freeze protector.
Cushion rubber
Fig. 5e
Air intake baffle
Front
Install a pair of windbaffle plates at the front and back of the
outdoor unit if it will be subject to strong wind during the
winter. (Figs. 5f, 5g, 5h, 5i, and 5j)
Wind
Back
Wind
Air discharge baffle
No air intake baffle required on this side.
Fig. 5f
11
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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
C
J
3- 1/4"
K
(3- 6.5 mm)
4- 1/4"
(4- 6.5 mm)
G
G
C
E
R
L
Q
I
E
D
A
K
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) 25-3/16 25/32 1-31/32
(mm) 640 20 50
(inch) 25-3/16 25/32
25
10-5/8 10-5/8 25/64 25/32 19/32 25-7/8 19/64 25/64 5-29/32 25/32 25/32
270 270 10 20 15 657 7.5 10 150 20 20
CU-3KS19NBU,
CU-4KS24NBU
635
1-3/8 30-29/32 13-25/32 13-25/32 25/64 25/32 19/32 31-25/32 19/64 25/64 5-29/32 25/32 25/32
CU-4KS31NBU
(mm)
640
20
35
785
350
350
10
20
15
807
7.5
10
150
20
20
For Air Discharge
Dimensions
Model
A
B
C
D
E
F
G
H
I
J
K
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
(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
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
12
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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 position.
2. Install the windbaffle on the unit using field supply
bolts and nuts.
3. 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
Panel side R
Panel top
holes.
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.
13
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2-5. Outer Dimensions of Outdoor Unit
(1) CU-3KS19NBU
23-15/16
5-11/32
15/32
A
35-7/16 (900)
2-29/32
Service valve on narrow tube side
(Outer diameter 1/4"( ))
A
6.35
Service valve on wide tube side
(Outer diameter 3/8"( ))
9.52
2-1/32 4-1/2
1-13/16
2-1/16
Fig. 6a
(2) CU-4KS24NBU
A
23-15/16
5-11/32
15/32
Service valve on wide tube side
(Outer diameter 1/2"(12.70))
35-7/16 (900)
2-29/32
Service valve on narrow tube side
(Outer diameter 1/4"(6.35))
A
1-13/16
2-1/16
2-1/32 4-1/2
Service valve on wide tube side
(Outer diameter 3/8"(9.52))
2-13/32
Fig. 6b
(3) CU-4KS31NBU
A
23-15/16
5-11/32
15/32
35-7/16 (900)
2-29/32
A
Service valve on narrow tube side
(Outer diameter 1/4"(6.35))
Service valve on wide tube side
(Outer diameter 1/2"(12.70))
2-1/32 4-1/2
1-13/16
2-1/16
Service valve on wide tube side
(Outer diameter 3/8"(9.52))
2-13/32
unit: inch (mm)
Fig. 6c
14
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2-6. Diagram of Outdoor Unit Installation
Never install only a single indoor unit.
Ceiling-mounted
cassette types
Wall-mounted types
Indoor unit D
Indoor unit D
Indoor unit C
Indoor unit B
Indoor unit A
Be sure to connect indoor and outdoor units only in
combinations that are listed in the catalog or in the
combination table that was provided with the outdoor unit.
(Use caution. Connecting any other model may result in
operation failure and malfunction.)
Indoor unit C
Indoor unit B
Indoor unit A
The dimensions indicated by
in the figure below are
spaces that are required in order to maintain
performance. Install in a location where the dimensions
indicated by
are ensured, and where 2 or more faces
of the unit are unobstructed. In principle, the top direction
should be unobstructed.
Service space
Power breaker
Ensure 6"(15cm)
of space if a
drain hose is to
be used.
Access panel C
D
C
B
A
Base (not provided)
(concrete or similar material)
Ground
wire
Fasten with anchor bolts
(not provided)
(not
provided)
(3/8" or M10, 4 locations)
Fig. 7
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3. Installation Process
3-1. Embedding the Tubing and Wiring
ꢁ Do not connect tubes to locations that are embedded.
ꢁ Be sure to bind refrigerant tubing and inter-unit cables
together with vinyl tape.
ꢁ The power cable must be obtained on-site.
(#12: Less than 85 ft.)
# ... AWG (American Wire Gauge)
ꢁ Be sure to apply the provided labels to both ends of
the inter-unit cables to prevent miswiring.
ꢁ Securely seal the end of embedded tubing with vinyl
tape in order to prevent dirt or moisture entry.
ꢁ In order to prevent insulation breakdown and ground
faults, do not allow the wire ends to come in contact
with rainwater, or be subject to dew condensation.
3-2. Use of the Flaring Method
Deburring
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.
After
Before
3-3. 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. 8
(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. 8)
16
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NOTE
Copper
tubing
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 9)
(3) Remove the flare nut from the unit and be sure to mount
it on the copper tube.
Reamer
(4) Make a flare at the end of copper tube with a flare tool.*
(Figs. 10 and 11)
Fig. 9
(*Use “RIDGID” or equivalent.)
If the previous flare tool
(clutch-type) is used:
If the special R410A
flare tool is used:
NOTE
A good flare should have the following characteristics:
ꢁ inside surface is glossy and smooth.
ꢁ edge is smooth.
0.0472" (1.2 mm)
0 to 0.0196"
(0 to 0.5 mm)
Adjust so that the amount of tube
protrusion is as shown in the figure.
ꢁ tapered sides are of uniform length.
Fig. 10
3-4. Caution before Connecting Tubes Tightly
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.
Flare nut
Copper
tubing
b) Be sure to apply refrigerant lubricant to the matching
surfaces of the flare and union before connecting them
together. This is effective for reducing gas leaks.
(Fig. 12)
Flare tool
Fig. 11
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. 13)
Apply refrigerant
lubricant here and here
3-5. Tubing Connections
Fig. 12
a) Temporary connection:
Screw in 3 – 5 turns by hand. (Fig.14)
b) To fasten the flare nuts, apply specified torque as:
Table 4
Tube Dia.
Nut
Tightening Torque
Flare nut
Union
Fig. 13
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)
D
Service valve on
narrow tube side
C
B
A
Apply the provided labels
to the indoor and outdoor
unit tubing connectors to
prevent errors in
Service valve on
wide tube side
connections.
Fig. 14
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Torque wrench
Be sure to match refrigerant
tubing and electric wiring
between indoor and outdoor
units.
CAUTION
Spanner
Indoor unit
Outdoor unit
Fig. 15
3-6. Insulation of Refrigerant Tubing
Insulation
IMPORTANT
Thickness:
min. 5/16"
(8 mm)
Min.
5/16"
(8 mm)
To prevent heat loss and wet floors due to dripping of con-
densation, both tubes must be well insulated with a
proper insulation material.
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 16)
Fig. 16
ꢀ For wall-mounted units
After connecting the refrigerant tubing to the outdoor unit
and performing a leak test on the connecting part, insulate it
with the tubing insulation. (Fig 17a)
Insulation
Fig. 17a
ꢀ For ceiling-mounted cassette units
Wind the insulation tape around the flare nuts at the tube
connections. Secondly cover up the tubing connections
with the flare insulation (1/8" (T3, supplied)). Then wind the
other flare insulation (3/16" (T5, supplied)). Finally, fasten
the insulation at both ends with the supplied vinyl ties.
(Fig. 17b)
Insulation tape (supplied)
Flare insulation (3/16"(T5, supplied) )
Flare insulation (1/8"(T3, supplied) )
Tube insulation
(not supplied)
Flare nut
Insulation material
Vinyl tie (supplied)
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must
not easily absorb moisture.
Fig. 17b
Drain hose insulation
and vinyl tie
Drain pipe and insulation
(not supplied)
Refrigerant tubing
and insulation
(not supplied)
(supplied)
Drain hose
and hose band
(supplied)
Insulation tape (supplied)
Vinyl tie (supplied)
Flare
insulation (supplied)
The procedure used for installing
the insulation for both wide and
narrow tubes are the same.
Fig. 17c
Never grasp the drain or refrigerant connecting out-
lets when moving the unit.
18
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3-7. Taping the Tubes
After a tube has been insulated,
never try to bend it into a narrow
curve, as this may cause the tube
to break or crack.
CAUTION
Clamp
Insulated 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. 18)
Fig. 18
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. 19
3-8. 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. 19)
4. Air Purging
Service
valve on
narrow
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below. Therefore, they
must be purged completely.
D
C
B
A
tube side
Manifold gauge
(special for R410A)
Service
valve on
wide tube
side
High-pressure valve
Low-pressure
ꢁ pressure in the system rises
ꢁ operating current rises
ꢁ cooling efficiency drops
ꢁ moisture in the air may freeze and block capillary tubing
valve
Vacuum pump
adapter
Lo
Hi
(for preventing
reverse flow)
(special for
R410A)
Leave the
valve open.
Open
ꢁ water may lead to corrosion of parts in the refrigerant
Vacuum
pump
Hex wrench
Charging hose
(special for R410A)
system
With push-pin
ꢀ Air Purging with a Vacuum Pump
(for Test Run)
Fig. 20
ꢁ In order to protect the earth’s environment, be sure to use
a vacuum pump to perform the air purge.
In order to prevent charging errors
with the air conditioner that uses
R410A, the screw diameter at the
service valve charging port has
been changed. When recharging or
performing other servicing, use the
special charging hose and manifold
gauge.
CAUTION
(Never perform an air purge by using the refrigerant gas
cylinder or other external gas, or by using the gas inside
the outdoor unit.)
19
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Stopper
Cap tightening torque:
170 – 215 lbs·in
(200 – 250 kgf·cm)
(Tighten by hand, then
use a wrench to turn
approximately
Spindle
Perform the air purge for tubes A, B, C, and D. Use the same
procedures for all tubes.
Service port
Screw diameter: 1/2
UNF 20 threads
(1) Check that each tube (both narrow and wide tubes)
between the indoor and outdoor units have been proper-
ly 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.
45°.)
Valve core
(2) Using an adjustable wrench or box wrench, remove the
valve caps from the service valve on both narrow and
wide tubes.
Cap nut tightening torque:
60 – 95 lbs·in
(70 – 110 kgf·cm)
(Tighten by hand, then use a
wrench to turn approximately 30 .)
(3) Connect a vacuum pump and a manifold valve (with
pressure gauges) to the service port on the wide tube
service valve. (Fig. 20).
<Structure of service valve on wide tube side>
NOTE
Before using the vacuum pump
CAUTION
adapter, read the vacuum pump
External diameter of service port
R410A: 5/16"
adapter manual, and use the
adapter correctly.
Fig. 21
ꢁ When using a hex wrench to open the spindle, an
extremely small amount of refrigerant may leak.
This does not indicate a problem.
Be sure to use a manifold valve for
CAUTION
air purging. If it is not available, use
a stop valve for this purpose. The
“Hi” knob of the manifold valve
must always be kept closed.
ꢁ Use a hex wrench of a type to which force can be
easily applied.
(4) With the “Lo” knob of the manifold valve open and high-pressure valve (“Hi”) closed completely, run the vacuum pump.
Run the pump until the pressure is –101 kPa (–76 cmHg). The operation time for the vacuum pump varies with tubing
length and the capacity of the pump. The following table shows the amount of time required for evacuation:
Table 5
NOTE
Required time for evacuation when capacity
The required time in Table 5 is calculated based on the
of 100 liter/h vacuum pump is used
assumption that the ideal (or target) vacuum condition is
around 10 mmHg abs.
20 min. or more
(5) With the vacuum pump still running, close the “Lo” knob of the manifold valve. Then stop the vacuum pump. Fully
close the low-pressure valve and stop the vacuum pump. (Wait 1 – 2 minutes and check that the manifold gauge
pointer does not return. If it does return, find and repair the leak, then apply the vacuum again.)
(6) With a 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.
Be sure to completely insert the hex
CAUTION
wrench before attempting to turn the
valve.
(7) With a standard screwdriver, turn the wide tube service valve stem counterclockwise to fully open the valve.
(8) Turn the narrow tube service valve stem counter-clockwise to fully open the valve.
(9) Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure. Then, remove
the hose.
(10) Leak test all joints at the tubing (both indoor and outdoors) with liquid soap. Bubbles indicate a leak. Be sure to wipe
off the soap with a clean cloth.
If a CFC gas detector is used, use a
special detector for HFC refrigerant
CAUTION
(such as R410A and R134a).
20
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(11) Replace the flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or
box wrench. Next, mount the valve cap and tighten it with a torque wrench (the cap needs to be tightened with the
torque of 180 lbs·in (200 kgf·cm)). This process is very important to prevent gas from leaking from the system.
(12) Test run the air conditioner. (See page 26.)
(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.
ꢀ Pump Down
In order to protect the earth’s environment, be sure to perform pump-down to recover refrigerant
gas without releasing it into the atmosphere.
Close
ꢁ When relocating or disposing of the air conditioner, request this
service from the dealer where the unit was purchased, or from an
appropriate agent. Perform pump-down as described below.
D
C
B
A
Narrow tube side
Charging port
Close
Close
Close
What is pump-down?
ꢁ Pump-down refers to recovering the refrigerant gas from the refrig-
erant cycle at the outdoor unit. This work must be performed dur-
ing cooling operation. The refrigerant gas cannot be recovered
during heating operation.
ꢁ During winter, or if the temperature sensor prevents cooling opera-
tion, perform “forced cooling operation.”
Fig. 22
Pump-down procedure
D
C
B
A
(1) Fully close the spindles at the valves on the narrow tube side of
tubes A, B, C and D. (Refer to Fig. 22.)
Wide tube side
(2) Connect the manifold gauge to the charging port at the valve on
the wide tube side of tube D. Purge the air from the charging hose.
(Refer to Fig. 23.)
(3) Perform cooling operation or forced cooling operation.
When the pressure at the low-pressure side is 0.05 – 0.1 MPaG
(0.5 – 1 kg/cm2G), fully close the spindles at the valves on the
wide tube side of tubes A, B, C, and D, and immediately stop
operation. (Refer to Fig. 23.)
Manifold gauge
Charging hose
Fig. 23
In the winter, the outdoor unit may stop after 5 - 10 minutes of
operation. This is in order to protect the indoor unit heat
exchanger from freezing and does not indicate a problem.
Cap
Cap
Cap
Cap
(4) Disconnect the manifold gauge and the inter-unit tubes, and
attach the caps and flare nuts. At this point, pump-down is com-
pleted. (If the caps and flare nuts are not reattached, there is the
danger of gas leakage.) (Refer to Fig. 24.)
After disconnecting
the inter-unit tubes,
attach the flare nuts
with flare bonnets.
If pump-down is not possible
If the air conditioner cannot be operated because of a malfunction or
other cause, use a refrigerant recovery device to recover the refrigerant.
Fig. 24
21
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5. Wiring Instructions
5-1. General Precautions on Wiring
(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 circuit break-
er for overcurrent protection provided in the exclusive
line.
(3) To prevent possible hazard 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.
(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.
5-2. Recommended Wire Length and Diameter
Regulations on wiring diameter differ from locality to locality.
For field wiring requirements, please refer to your local elec-
trical codes. Carefully observe these regulations when car-
rying out the installation.
Table 6 shows maximum wire lengths for control line and
power line and fuse or circuit capacity.
NOTE
Refer to the wiring system diagram (Fig. 25a or 25b) for the
meaning of (A), (B), and (C) in Table 6.
Refer to your local codes or in the absence of local codes
see the National Electric Code: ANSI/NFPA70.
Table 6
Max. Power Line Length (ft.) Max. Control Line Length (ft.)
Fuse
or
AWG
(A)
(B) (C)
Model
CU-3KS19NBU
Circuit Capacity
(#12)
(#14)
85 (Max.)
85 (Max.)
85 (Max.)
82 (Max.)
82 (Max.)
100 (Max.)
15 A
CU-4KS24NBU
CU-4KS31NBU
20 A
20 A
# ... AWG (American Wire Gauge)
22
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WARNING
WARNING
ꢁ To avoid the risk of electric shock, each air conditioner
unit must be grounded.
ꢁ For the installation of a grounding device, please
observe local electrical codes.
ꢁ 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.
ꢁ Place a dedicated ground more than 7' (2 m) away from
other grounds and do not have it shared with other
electric appliances.
ꢁ 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.).
ꢁ Each wire must be firmly connected.
ꢁ No wire should be allowed to touch refrigerant
tubing, the compressor, or any moving part.
ꢁ Be sure to connect power wires correctly match-
ing up numbers on terminals of the outdoor unit
and respective indoor units A – D.
CAUTION
NOTE
ꢁ 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, secu-
rity 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.
*
Disconnect switch may be required by
national or local codes.
CAUTION
Always comply with national and local code
requirements.
5-3. Wiring System Diagram
4 indoor units with CU-4KS24NBU, CU-4KS31NBU
3 indoor units with CU-3KS19NBU
Disconnect
Disconnect
switch
*
*
switch
Field supply
Field supply
230/208V
OUTDOOR UNIT
1
2
3
230/208V
OUTDOOR UNIT
1
2
3
230/208V
230/208V
(
)
Terminal 12P
(B)
230/208V
230/208V
(
)
Terminal 9P
(C)
(A)
(B)
(B)
1
2
3
(A)
1
2
3
Grounding line
(C)
Disconnect
*
Grounding
line
Field supply
switch
(B)
(B)
Field supply
Disconnect
switch
(B)
(B)
*
1
2
3
230/208V
4
5
6
230/208V
(C)
1
2
3
4
5
6
230/208V
230/208V
230/208V
(B)
230/208V
(B)
(C) (B)
Grounding line
Disconnect switch
Field supply
*
Grounding
line
(Inter-unit)
power line
230/208V
230/208V
230/208V
Disconnect
*
7
8
9
(B)
230/208V
switch
Field supply
(B)
1
2
3
7
8
9
230/208V
1
2
3
(C)
(C)
(B)
230/208V
(C)
230/208V
(B)
Grounding
line
(C)
10
11
12
Grounding
line
Disconnect switch
*
1
2
Field supply
Terminal
(2P)
(B)
1
2
3
230/208V
230/208V
(D)
(A)
1
2
(C)
Grounding
line
(B)
Fig. 25a
(A)
Fig. 25b
23
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5-4. How to Connect Wiring to the Terminal
Loose wiring may cause the
WARNING
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist. There-
fore, be sure all wiring is
tightly connected.
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. 26
(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. 26) 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
Fig. 27
b) For Outdoor Unit
Stranded wire
ꢀ For solid core wiring (or F-cable)
Ring
connector
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the solid wire about 15/16" (25
mm). (Fig. 27)
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
Fig. 28
(3) Using the pliers, bend the solid wire to form a loop
suitable for the terminal screw.
Twist wire ends
(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.
ꢀ 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. 28
and 29)
Fig. 29
Special
washer
Screw
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
Screw and
special washer
Ring connector
Terminal plate
(3) Using a ring connector fastener or pliers, securely
clamp each stripped wire end with a ring connector.
(Fig. 28)
Ring
Wire
connector
(4) Place the ring connector wire, and replace and
tighten the removed terminal screw using a screw-
driver. (Fig. 30)
Wire
Fig. 30
24
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5-5. Wiring Instructions for the Outdoor Unit
CAUTION
ꢁ Be sure to correctly align inter-unit cables A, B, C and D.
Outdoor unit
Terminal board
1
2
Power supply
(conduit)
1
2
3
4
5
6
7
8
9 10 11 12
Power:
Single-phase,
230/208VAC 60HZ
Power breaker
(not provided)
Ground
Power cable (not provided)
(#12: Less than 85 ft.)
Inter Unit
(conduit)
Inter Unit
(conduit)
Indoor unit A
Indoor unit D
A is the indoor unit with
refrigerant tubing that is
D is the indoor unit with
refrigerant tubing that is
connected to service valve
A (bottom) of the outdoor unit.
connected to service valve
1 2 3
1 2 3
D (top) of the outdoor unit.
Terminal board
Terminal board
Label A
Label D
D
A
Indoor unit B
Indoor unit C
Inter-unit cables
Inter-unit cables
#14 (not provided)
#14 (not provided)
C is the indoor unit with
refrigerant tubing that is
B is the indoor unit with
refrigerant tubing that is
connected to service valve B
(second from the bottom) of
the outdoor unit.
connected to service valve
1 2 3
1 2 3
Inter-unit cables
Inter-unit cables
#14 (not provided)
C (third from the bottom)
of the outdoor unit.
#14 (not provided)
Label B
B
Label C
C
Terminal board
Terminal board
Be sure to perform grounding.
Attach a ground wire to either the
outdoor unit or indoor unit.
If there is a grounding terminal
inside the room, use the grounding
screw inside the indoor unit.
Be sure to apply the provided labels to both
ends of the inter-unit cables to prevent mis-
wiring. The units will not function if the wiring
connections are incorrect.
# ... AWG (American Wire Gauge)
Fig. 31
ꢁ Use a dedicated air conditioner circuit for power.
ꢁ To make connections to the outdoor unit, remove the inspection panel and tubing panel.
ꢁ Do not bring the inter-unit cables or power cable into contact with tubing or service valves.
ꢁ Use outdoor unit cable fasteners and fasten the inter-unit cables at the location where the cables are double-
sheathed.
ꢁ Arrange the wiring so that the inter-unit cables are contained in the inspection panel and tubing panel, as shown in
Fig. 31.
25
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Regulations on wire size differ from locality to locality. For
field wiring requirements, please refer to your local electri-
cal codes. Make sure that the installation fully complies
with all local and national regulations.
Lock nut
Cabinet
(1) Remove access panel “C”. (Fig. 32)
(2) Connect the inter-unit and power supply line accord-
ing to the drawing on the panel side.
Terminal
block
(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 con-
nections are correct as shown in the wiring system
diagram on panel side.
(5) Be sure to ground the unit according to your local
codes.
Access panel “C”
Plug
6. Test Run
Inter unit
(Conduit)
Power supply
(Conduit)
Performing a test run
Fig. 32
ꢁ Refer to the test run procedures in the indoor unit
installation manual.
ꢁ Perform the test run separately for each connected
indoor unit. If 2 units are operated simultaneously, it is
not possible to correctly check for errors in tubing and
wiring.
Checking tubing and wiring
Access panel C
Conduit plate
Perform the test run and check that operation is normal. If
there is an error in tubing or wiring, the refrigerant may
flow to indoor unit B when indoor unit A is operated (for
example).
CAUTION
CAUTION
Make sure there is no gap between
access panel “C” and the conduit plate.
ꢁ Stop operation immediately if there is an error in tubing
or wiring. Turn the power (breaker) to OFF, and check
whether the inter-unit cables are connected incorrectly,
or whether the narrow tubes A and B are connected in
reverse. Correct the connections.
Fig. 33
ꢁ If there is an error in tubing, pump-down must be per-
formed. Be sure to perform pump-down. After making
corrections, again purge the air from the tubes.
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7. Connecting a Home Automation Device
The HA (white) 4P terminal is located on the indoor unit PCB. If a HA device will be used,
connect it to this terminal.
8. Installation Check Sheet
The strength of the installation location is sufficient to support the air conditioner weight.
The indoor and outdoor units are installed level and vertically.
The power and voltage are as specified.
Inter-unit cables are securely fastened to the terminal board.
Inter-unit cables are securely fixed.
The power cable and inter-unit cables are not connected anywhere along their paths.
The ground wire is securely connected.
An air purge of the refrigerant circuit has been conducted.
A leak test of the tubing connections has been performed.
Thermal insulation has been applied to the tubing connections.
Drain connections are secure and water drains properly.
Putty has been used to close the hole in the wall.
All service valves are fully open.
Remote controller signals are being positively received.
27
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DC1111-0
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