Panasonic Air Conditioner CS KE12NB41 User Manual

TECHNICAL & SERVICE MANUAL  
CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1  
CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU  
DC INVERTER SPLIT SYSTEM AIR CONDITIONER  
Indoor Model No.  
Body (Panel)  
Product Code No.  
Body (Panel)  
Outdoor Model No. Product Code No.  
CU-KE12NK1  
CU-KE18NKU  
1 852 361 17  
1 852 361 20  
CS-KE12NB41 (CZ-18BT1U)  
1 852 361 05 (1 852 361 15)  
CS-KE18NB4UW (CZ-18BT1U) 1 852 361 07 (1 852 361 15)  
Indoor Unit  
Outdoor Unit  
Body  
Panel  
CS-KE12NB41 (Body) & CZ-18BT1U (Panel)  
CS-KE18NB4UW (Body) & CZ-18BT1U (Panel)  
CU-KE12NK1  
Remote Controller  
CU-KE18NKU  
Wired Remote Controller  
(Option)  
REFERENCE NO. SM700880  
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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 .....................................................................................................................  
1. OPERATING RANGE ...................................................................................................................  
2
4
6
2. SPECIFICATIONS  
2-1. Unit Specifications .............................................................................................................  
7
2-2. Major Component Specifications ....................................................................................... 13  
2-3. Other Component Specifications ....................................................................................... 17  
3. DIMENSIONAL DATA ................................................................................................................... 18  
4. REFRIGERANT FLOW DIAGRAM  
4-1. Refrigerant Flow Diagram ................................................................................................... 21  
5. PERFORMANCE DATA  
5-1. Temperature Charts ............................................................................................................ 23  
5-2. Cooling Capacity ................................................................................................................ 27  
5-3. Cooling Capacity (Low Ambient) ......................................................................................... 29  
5-4. Heating Capacity ................................................................................................................ 31  
6. ELECTRICAL DATA  
6-1. Electrical Characteristics .................................................................................................... 33  
6-2. Electric Wiring Diagrams .................................................................................................... 35  
7. MAINTENANCE  
7-1. Address Setting of the Remote Control Unit ....................................................................... 38  
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit .................................. 39  
7-3. Disassembly Procedure ...................................................................................................... 40  
8. FUNCTIONS  
8-1. Operation Functions ........................................................................................................... 47  
8-2. Protective Functions ........................................................................................................... 49  
9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)  
9-1. Precautions before Performing Inspection or Repair ........................................................... 51  
9-2. Method of Self-Diagnostics ................................................................................................. 51  
9-3. Checking the Indoor and Outdoor Units .............................................................................. 53  
9-4. Trouble Diagnosis of Fan Motor ........................................................................................... 57  
9-5. Noise Malfunction and Electromagnetic Interference .......................................................... 59  
4
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Page  
10. CHECKING ELECTRICAL COMPONENTS  
10-1. Measurement of Insulation Resistance ............................................................................... 60  
10-2. Checking Continuity of Fuse on PCB Ass'y ......................................................................... 61  
11. REFRIGERANT R410A:  
SPECIAL PRECAUTIONS WHEN SERVICING UNIT  
11-1. Characteristics of New Refrigerant R410A ......................................................................... 62  
11-2. Checklist before Servicing ................................................................................................... 63  
11-3. Tools Specifically for R410A ................................................................................................ 64  
11-4. Tubing Installation Procedures ............................................................................................ 64  
11-5. In Case of Compressor Malfunction .................................................................................... 65  
11-6. In Case Refrigerant is Leaking ............................................................................................ 67  
11-7. Charging Additional Refrigerant .......................................................................................... 68  
11-8. Retro-Fitting Existing Systems ............................................................................................ 68  
APPENDIX A Operating Instructions ............................................................................................ A-1  
(CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)  
APPENDIX B INSTALLATION INSTRUCTIONS ............................................................................. A-2  
(CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)  
APPENDIX C Operating Instructions ............................................................................................ A-3  
(CZ-RD515U)  
APPENDIX D INSTALLATION INSTRUCTIONS ............................................................................. A-4  
(CZ-RD515U)  
5
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1. OPERATING RANGE  
Temperature  
Indoor Air Intake Temp.  
95 °F DB / 71 °F WB  
67 °F DB / 57 °F WB  
80 °F DB / 67 °F WB  
– DB / – WB  
Outdoor Air Intake Temp.  
115 °F DB  
Maximum  
Cooling  
Minimum  
0 °F DB  
Maximum  
Heating  
75 °F DB / 65 °F WB  
– DB / 0 °F WB  
Minimum  
6
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2. SPECIFICATIONS  
2-1. Unit Specifications  
Indoor Unit  
Outdoor Unit CU-KE12NK1  
CS-KE12NB41 & CZ-18BT1U  
2-1-1.  
Voltage Rating  
115V Single-Phase 60Hz  
Cooling  
11,900 ( 3,000 to 11,900 )  
Heating  
Total Capacity  
BTU/h  
kW  
13,600 ( 3,000 to 13,600 )  
3.5  
( 0.9 to 3.5 )  
7,200  
4.0  
( 0.9 to 4.0 )  
Sensible Capacity  
Latent Capacity  
-
-
BTU/h  
BTU/h  
ft3/min (m3/h)  
Pints/h  
4,700  
Air Circulation (Hi/Me/Lo)  
Moisture Removal (High)  
Available Voltage Range  
Running Amperes  
Power Input  
235(399) / 206(350) / 194(330) 268(455) / 247(420) / 224(381)  
4.26  
-
V
A
W
104 to 126  
12.6 ( 2.5 to 12.6 )  
1,260 ( 250 to 1,260 )  
14.6 ( 2.5 to 14.6 )  
1,460 ( 250 to 1,460 )  
Power Factor  
EER  
COP  
SEER  
%
87  
9.44  
-
16  
-
87  
-
2.74  
-
BTU/h/W  
W/W  
BTU/Wh  
BTU/Wh  
A
HSPF  
8.5  
Compressor Locked Rotor Amperes  
Fuse or Circuit Breaker Capacity  
Controls / Temperature Control  
Control Unit  
20  
20  
A
Microprocessor / I.C. Thermister  
Wireless Remote Control Unit  
24-Hour ON or OFF Timer, 1-Hour OFF Timer  
Auto and 3 steps / Auto (Hi, Me, Lo)  
-
Timer  
Fan Speeds  
Indoor / Outdoor  
Horizontal  
Airflow Direction (Indoor)  
Vertical  
Auto  
Air Filter  
Washable, Anti-Mold  
Compressor  
DC Rotary (Inverter)  
Refrigerant / Amount charged at shipment  
Refrigerant Control  
Ibs (g)  
R410A / 2.43 (1,100)  
Electric Expansion Valve  
Operation Sound  
Indoor : Hi/Me/Lo  
Outdoor : Hi  
dB-A  
dB-A  
34 / 32 / 31  
47  
35 / 34 / 32  
49  
Refrigerant Tubing Connections  
Max. allowable tubing length at shipment  
Flare Type  
25 (7.5)  
1/4 (6.35)  
3/8 (9.52)  
CZ-RD515U  
ft (m)  
inch (mm)  
inch (mm)  
Refrigerant  
Narrow tube  
Wide tube  
Tube Diameter  
Wired Remote Controller (Option)  
7
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Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit CU-KE12NK1  
Individual Unit  
Body Panel  
(CS-KE12NB41) (CZ-18BT1U)  
11-5/32 (283) 1-9/16 (40)  
Indoor Unit  
(CS-KE12NB41 & CZ-18BT1U)  
Dimensions & Weight (Indoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
12-5/16 (313)  
inch (mm)  
inch (mm)  
inch (mm)  
24-19/32 (625)  
24-19/32 (625)  
-
22-5/8 (575) 24-19/32 (625)  
22-5/8 (575) 24-19/32 (625)  
11-13/32 (290) 4-1/8 (105)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
-
-
24-13/16 (630) 26-3/16 (665)  
28-1/8 (714) 26-11/16 (678)  
Weight  
41.3 (18.7)  
-
35.3 (16)  
41.9 (19)  
6.0 (2.7)  
7.7 (3.5)  
Shipping  
Ib. (kg)  
cu.ft (m3)  
-
4.59 (0.13)  
1.65 (0.04)  
Shipping Volume  
Outdoor Unit  
(CU-KE12NK1)  
Dimensions & Weight (Outdoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
21-9/16 (548)  
inch (mm)  
inch (mm)  
inch (mm)  
28-11/32 (720)  
10-7/16 (265)  
23-15/32 (596)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
34-3/32 (866)  
14-1/2 (368)  
77.2 (35.0)  
83.8 (38.0)  
Weight  
Shipping  
Ib. (kg)  
cu.ft (m3)  
6.35 (0.18)  
Shipping Volume  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
Remarks: Rating conditions are:  
Cooling: Indoor air temperature 80 °F DB / 67 °F WB  
Outdoor air temperature 95 °F DB / 75 °F WB  
Heating: Indoor air temperature 70 °F DB  
Outdoor air temperature 47 °F DB / 43 °F WB  
8
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Indoor Unit  
Outdoor Unit CU-KE18NKU  
CS-KE18NB4UW & CZ-18BT1U  
2-1-2.  
< 230V >  
Voltage Rating  
230V Single-Phase 60Hz  
Cooling Heating  
20,400 ( 4,400 to 20,400 )  
Total Capacity  
BTU/h  
kW  
17,500 ( 4,000 to 17,500 )  
5.15 ( 1.2 to 5.15 )  
10,600  
6.0  
( 1.3 to 6.0 )  
Sensible Capacity  
Latent Capacity  
-
-
BTU/h  
BTU/h  
ft3/min (m3/h)  
Pints/h  
6,900  
Air Circulation (Hi/Me/Lo)  
Moisture Removal (High)  
Available Voltage Range  
Running Amperes  
Power Input  
341(579) / 294(500) / 253(430) 383(651) / 324(551) / 265(450)  
4.89  
-
V
A
W
187 to 253  
8.3  
( 1.2 to 8.3 )  
10.5 ( 1.3 to 10.5 )  
1,860 ( 250 to 1,860 )  
2,340 ( 270 to 2,340 )  
Power Factor  
EER  
COP  
SEER  
%
97  
9.41  
-
16  
-
97  
-
2.56  
-
BTU/h/W  
W/W  
BTU/Wh  
BTU/Wh  
A
HSPF  
8.5  
Compressor Locked Rotor Amperes  
Fuse or Circuit Breaker Capacity  
Controls / Temperature Control  
Control Unit  
17.5  
15  
A
Microprocessor / I.C. Thermister  
Wireless Remote Control Unit  
24-Hour ON or OFF Timer, 1-Hour OFF Timer  
Auto and 3 steps / Auto (Hi, Me, Lo)  
-
Timer  
Fan Speeds  
Indoor / Outdoor  
Horizontal  
Airflow Direction (Indoor)  
Vertical  
Auto  
Air Filter  
Washable, Anti-Mold  
Compressor  
Refrigerant / Amount charged at shipment  
Refrigerant Control  
DC Twin Rotary (Inverter)  
R410A / 2.87 (1,300)  
Electric Expansion Valve  
Ibs (g)  
Operation Sound  
Indoor : Hi/Me/Lo  
Outdoor : Hi  
dB-A  
dB-A  
44 / 40 / 36  
51  
44 / 40 / 36  
52  
Refrigerant Tubing Connections  
Max. allowable tubing length at shipment  
Flare Type  
25 (7.5)  
1/4 (6.35)  
1/2 (12.7)  
CZ-RD515U  
ft (m)  
inch (mm)  
inch (mm)  
Refrigerant  
Narrow tube  
Wide tube  
Tube Diameter  
Wired Remote Controller (Option)  
9
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Indoor Unit  
CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit CU-KE18NKU  
< 230V >  
Individual Unit  
Body Panel  
(CS-KE18NB4UW) (CZ-18BT1U)  
11-5/32 (283) 1-9/16 (40)  
Indoor Unit  
(CS-KE18NB4UW & CZ-18BT1U)  
Dimensions & Weight (Indoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
12-5/16 (313)  
inch (mm)  
inch (mm)  
inch (mm)  
24-19/32 (625)  
24-19/32 (625)  
-
22-5/8 (575) 24-19/32 (625)  
22-5/8 (575) 24-19/32 (625)  
11-13/32 (290) 4-1/8 (105)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
-
-
24-13/16 (630) 26-3/16 (665)  
28-1/8 (714) 26-11/16 (678)  
Weight  
41.3 (18.7)  
-
35.3 (16)  
41.9 (19)  
6.0 (2.7)  
7.7 (3.5)  
Shipping  
Ib. (kg)  
cu.ft (m3)  
-
4.59 (0.13)  
1.65 (0.04)  
Shipping Volume  
Outdoor Unit  
(CU-KE18NKU)  
Dimensions & Weight (Outdoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
26-3/8 (670)  
inch (mm)  
inch (mm)  
inch (mm)  
34-21/32 (880)  
11-7/32 (285)  
28-27/32 (733)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
39-27/32 (1,012)  
14-29/32 (379)  
97.0 (44.0)  
Weight  
Shipping  
Ib. (kg)  
cu.ft (m3)  
105.8 (48.0)  
Shipping Volume  
9.88 (0.28)  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
Remarks: Rating conditions are:  
Cooling: Indoor air temperature 80 °F DB / 67 °F WB  
Outdoor air temperature 95 °F DB / 75 °F WB  
Heating: Indoor air temperature 70 °F DB  
Outdoor air temperature 47 °F DB / 43 °F WB  
10  
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Indoor Unit  
Outdoor Unit CU-KE18NKU  
CS-KE18NB4UW & CZ-18BT1U  
2-1-3.  
< 208V >  
Voltage Rating  
208V Single-Phase 60Hz  
Cooling Heating  
20,400 ( 4,400 to 20,400 )  
Total Capacity  
BTU/h  
kW  
17,500 ( 4,000 to 17,500 )  
5.15 ( 1.2 to 5.15 )  
10,600  
6.0  
( 1.3 to 6.0 )  
Sensible Capacity  
Latent Capacity  
-
-
BTU/h  
BTU/h  
ft3/min (m3/h)  
Pints/h  
6,900  
Air Circulation (Hi/Me/Lo)  
Moisture Removal (High)  
Available Voltage Range  
Running Amperes  
Power Input  
341(579) / 294(500) / 253(430) 383(651) / 324(551) / 265(450)  
4.89  
-
V
A
W
187 to 253  
9.1  
( 1.2 to 9.1 )  
11.5 ( 1.3 to 11.5 )  
1,860 ( 250 to 1,860 )  
2,340 ( 270 to 2,340 )  
Power Factor  
EER  
COP  
SEER  
%
98  
9.41  
-
16  
-
98  
-
2.56  
-
BTU/h/W  
W/W  
BTU/Wh  
BTU/Wh  
A
HSPF  
8.5  
Compressor Locked Rotor Amperes  
Fuse or Circuit Breaker Capacity  
Controls / Temperature Control  
Control Unit  
17.5  
15  
A
Microprocessor / I.C. Thermister  
Wireless Remote Control Unit  
24-Hour ON or OFF Timer, 1-Hour OFF Timer  
Auto and 3 steps / Auto (Hi, Me, Lo)  
-
Timer  
Fan Speeds  
Indoor / Outdoor  
Horizontal  
Airflow Direction (Indoor)  
Vertical  
Auto  
Air Filter  
Washable, Anti-Mold  
Compressor  
Refrigerant / Amount charged at shipment  
Refrigerant Control  
DC Twin Rotary (Inverter)  
R410A / 2.87 (1,300)  
Electric Expansion Valve  
Ibs (g)  
Operation Sound  
Indoor : Hi/Me/Lo  
Outdoor : Hi  
dB-A  
dB-A  
44 / 40 / 36  
51  
44 / 40 / 36  
52  
Refrigerant Tubing Connections  
Max. allowable tubing length at shipment  
Flare Type  
25 (7.5)  
1/4 (6.35)  
1/2 (12.7)  
CZ-RD515U  
ft (m)  
inch (mm)  
inch (mm)  
Refrigerant  
Narrow tube  
Wide tube  
Tube Diameter  
Wired Remote Controller (Option)  
11  
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Indoor Unit  
CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit CU-KE18NKU  
< 208V >  
Individual Unit  
Body Panel  
(CS-KE18NB4UW) (CZ-18BT1U)  
11-5/32 (283) 1-9/16 (40)  
Indoor Unit  
(CZ-KE18NB4UW & CZ-18BT1U)  
Dimensions & Weight (Indoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
12-5/16 (313)  
inch (mm)  
inch (mm)  
inch (mm)  
24-19/32 (625)  
24-19/32 (625)  
-
22-5/8 (575) 24-19/32 (625)  
22-5/8 (575) 24-19/32 (625)  
11-13/32 (290) 4-1/8 (105)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
-
-
24-13/16 (630) 26-3/16 (665)  
28-1/8 (714) 26-11/16 (678)  
Weight  
41.3 (18.7)  
-
35.3 (16)  
41.9 (19)  
6.0 (2.7)  
7.7 (3.5)  
Shipping  
Ib. (kg)  
cu.ft (m3)  
-
4.59 (0.13)  
1.65 (0.04)  
Shipping Volume  
Outdoor Unit  
(CU-KE18NKU)  
Dimensions & Weight (Outdoor Unit)  
Unit Dimensions  
Height  
Width  
Depth  
inch (mm)  
26-3/8 (670)  
inch (mm)  
inch (mm)  
inch (mm)  
34-21/32 (880)  
11-7/32 (285)  
28-27/32 (733)  
Package Dimensions Height  
Width  
Depth  
Net  
inch (mm)  
inch (mm)  
Ib. (kg)  
39-27/32 (1,012)  
14-29/32 (379)  
97.0 (44.0)  
Weight  
Shipping  
Ib. (kg)  
cu.ft (m3)  
105.8 (48.0)  
Shipping Volume  
9.88 (0.28)  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
Remarks: Rating conditions are:  
Cooling: Indoor air temperature 80 °F DB / 67 °F WB  
Outdoor air temperature 95 °F DB / 75 °F WB  
Heating: Indoor air temperature 70 °F DB  
Outdoor air temperature 47 °F DB / 43 °F WB  
12  
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2-2. Major Component Specifications  
2-2-1. Indoor Unit  
Indoor Unit (Body) CS-KE12NB41  
Control PCB  
Part No.  
Controls  
CB-CS-KE12NB4U  
Microprocessor  
250V 3A  
Control Circuit Fuse  
Fan  
Type  
Turbo  
Q'ty ... Dia. and Length  
inch (mm)  
1 ... D12-5/8 / L5-3/4 (D322/L147)  
Fan Motor  
Type  
DC Motor  
Model ... Q'ty  
SIC-62FW-D866-2 ... 1  
No. of Poles  
Rough Measure RPM (Cool / Heat)  
8
470 / 520  
DC160V / 23W  
-
Rating  
Coil Resistance  
Voltage / Nominal Output  
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  
Drain Pump  
Model ... Q'ty  
Rating  
PLD-12115ST-1 ... 1  
AC115V, 60Hz  
10.8  
Voltage, Hz  
Input  
W
Coil Resistance  
101 +/- 10%  
Ohm  
(Ambient Temp. 68 °F (20 °C))  
Safty Device  
Type  
Open  
Thermal Fuse  
293 (145)  
°F (°C)  
Heat Exchanger Coil  
Coil  
Aluminum Plate Fin / Copper Tube  
Rows  
2
Fins per inch  
Face Area  
18.1  
2.94 (0.273)  
ft2 (m2)  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
Indoor Unit (Panel) CZ-18BT1U  
Flap Motor  
Type  
Stepping Motor  
MPZN-12V ... 2  
Model ... Q'ty  
Rating  
DC 12V  
Coil Resistance  
(Ambient Temp. 77 °F (25 °C))  
Ohm  
Each Pair of Terminal : 380 +/- 7%  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
13  
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Indoor Unit (Body) CS-KE18NB4UW  
Control PCB  
Part No.  
Controls  
CB-CS-KE18NB4U  
Microprocessor  
250V 3A  
Control Circuit Fuse  
Fan  
Type  
Turbo  
Q'ty ... Dia. and Length  
inch (mm)  
1 ... D12-5/8 / L5-3/4 (D322/L147)  
Fan Motor  
Type  
DC Motor  
Model ... Q'ty  
SIC-62FV-D866-2 ... 1  
No. of Poles  
Rough Measure RPM (Cool / Heat)  
8
650 / 720  
DC340V / 20W  
-
Rating  
Coil Resistance  
Voltage / Nominal Output  
Ohm  
(Ambient Temp. 68 °F (20 °C))  
Safety Device  
Type  
Thermal Fuse  
Over- Current Protection  
Over- Heat Protection  
Run Capacitor  
Yes  
Yes  
-
-
Micro F  
VAC  
Drain Pump  
Model ... Q'ty  
Rating  
PLD-12230ST-1 ... 1  
AC208 to 240V, 60Hz  
10.8  
Voltage, Hz  
Input  
W
Coil Resistance  
333 +/- 10%  
Ohm  
(Ambient Temp. 68 °F (20 °C))  
Safty Device  
Type  
Open  
Thermal Fuse  
293 (145)  
°F (°C)  
Heat Exchanger Coil  
Coil  
Aluminum Plate Fin / Copper Tube  
Rows  
2
Fins per inch  
Face Area  
18.1  
2.94 (0.273)  
ft2 (m2)  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
Indoor Unit (Panel) CZ-18BT1U  
Flap Motor  
Type  
Stepping Motor  
MP24ZN-12V ... 2  
Model ... Q'ty  
Rating  
DC 12V  
Coil Resistance  
(Ambient Temp. 77 °F (25 °C))  
Ohm  
Each Pair of Terminal : 380 +/- 7%  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
14  
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2-2-2. Outdoor Unit  
Outdoor Unit CU-KE12NK1  
Control PCB  
Part No.  
Controls  
CB-CU-KE12NK1  
Microprocessor  
125V 25A  
Control Circuit Fuse  
Compressor  
Type  
DC Rotary (Hermetic)  
G4C090LU1ER / 900W  
FV50S ... 0.68 (320)  
U - V : 0.81  
Compressor Model / Nominal Output  
Compressor Oil ... Amount  
Coil Resistance (Ambient Temp. 68 °F (20 °C))  
Pints (cc)  
Ohm  
V - W : 0.81  
W - U : 0.81  
Safety Device  
CT (Peak current cut-off control)  
Compressor Discharge Temp. Control  
Yes  
Yes  
Operation cut-off control in abnormal ambient Temp.  
Yes  
Overload Relay  
Run Capacitor  
Model  
Operation Temp.  
Micro F  
CS-7L115  
Open : 239 °F (115 °C), Close : 203 °F (95 °C)  
-
VAC  
-
Crankcase Heater  
115V 20W  
Fan  
Type  
Propeller  
Q'ty ... Dia.  
inch (mm)  
1 ... D15-3/4 (D400)  
Fan Motor  
Type  
DC Motor  
Model ... Q'ty  
SIC-67FV-F460-1... 1  
No. of Poles  
Rough Measure RPM (Cool / Heat)  
Nominal Output  
8
750 / 750  
50  
W
Coil Resistance  
Ohm  
RED - WHT : 77.5  
WHT - BLU : 77.5  
BLU - RED : 77.5  
(Ambient Temp. 68 °F (20 °C))  
Safety Device  
Type  
Internal Controller  
Over- Current Protection  
Run Capacitor  
Yes  
-
-
Micro F  
VAC  
Heat Exchanger Coil  
Coil  
Aluminum Plate Fin / Copper Tube  
Rows  
2
Fins per inch  
Face Area  
18.1  
ft2 (m2)  
3.95 (0.367)  
External Finish  
Acrylic baked-on enamel finish  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
15  
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Outdoor Unit CU-KE18NKU  
Control PCB  
Part No.  
Controls  
CB-CU-KE18NKU  
Microprocessor  
250V 25A  
Control Circuit Fuse  
Compressor  
Type  
DC Twin Rotary (Hermetic)  
C-6RVN93H0M / 1,050W  
FV50S ... 0.74 (350)  
R - S : 0.482  
Compressor Model / Nominal Output  
Compressor Oil ... Amount  
Coil Resistance (Ambient Temp. 68 °F (20 °C))  
Pints (cc)  
Ohm  
S - T : 0.482  
T - R : 0.482  
Safety Device  
CT (Peak current cut-off control)  
Compressor Discharge Temp. Control  
Yes  
Yes  
Operation cut-off control in abnormal ambient Temp.  
Yes  
Overload Relay  
Run Capacitor  
Model  
Operation Temp.  
Micro F  
CS-7L115  
Open : 239 °F (115 °C), Close : 203 °F (95 °C)  
-
-
-
VAC  
Crankcase Heater  
Fan  
Type  
Propeller  
Q'ty ... Dia.  
inch (mm)  
1 ... D16-17/32 (D420)  
Fan Motor  
Type  
DC Motor  
Model ... Q'ty  
SIC-67FV-F460-1 ... 1  
No. of Poles  
Rough Measure RPM (Cool / Heat)  
Nominal Output  
8
820 / 850  
50  
W
Coil Resistance  
Ohm  
RED - WHT : 77.5  
WHT - BLU : 77.5  
BLU - RED : 77.5  
(Ambient Temp. 68 °F (20 °C))  
Safety Device  
Type  
Internal Controller  
Over- Current Protection  
Run Capacitor  
Yes  
-
-
Micro F  
VAC  
Heat Exchanger Coil  
Coil  
Aluminum Plate Fin / Copper Tube  
Rows  
2
Fins per inch  
Face Area  
21.2  
ft2 (m2)  
5.49 (0.510)  
External Finish  
Acrylic baked-on enamel finish  
DATA SUBJECT TO CHANGE WITHOUT NOTICE.  
16  
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2-3. Other Component Specifications  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit CU-KE12NK1  
CU-KE18NKU  
• Indoor heat exchanger sensor  
(Model:PT2M-51H-S3)  
• Compressor temp sensor  
...  
• Indoor air temp sensor  
(Model:KTEC-35-S98)  
(CU-KE12NK1 Model:DTN-TKS274Y TH2)  
...  
(CU-KE18NKU Model:DTN-TKS293B)  
10  
9
8
7
6
5
4
3
2
1
0
200  
180  
160  
140  
120  
100  
80  
60  
40  
20  
0
50  
59 68 77 86 95 104  
32 50 68 86 104 122 140 158 176 194  
(0) (10)(20) (30) (40)(50) (60) (70)(80) (90)  
(10) (15) (20) (25) (30) (35) (40)  
Temperature °F (°C)  
Temperature °F (°C)  
• Outdoor air temp sensor  
...  
(CU-KE12NK1 Model:DTN-TKS269B)  
...  
(CU-KE18NKU Model:TKS295B)  
• Outdoor heat exchanger sensor  
...  
(CU-KE12NK1 Model:DTN-TKS274Y TH1)  
...  
(CU-KE18NKU Model:TKS292B)  
40  
35  
30  
25  
20  
15  
10  
5
0
-
4
5
14 23 32 41 50 59 68  
10) ( 5) (0) (5) (10) (15) (20)  
Temperature °F (°C)  
(
-
20)(  
-
15)(  
-
-
17  
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3. DIMENSIONAL DATA  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
CS-KE18NB4UW & CZ-18BT1U  
1 - 3 / 1 6  
7 - 1 1 / 1 6  
2 1 / 3 2  
3 - 1 / 8  
C e i l i n g o p e n i n g d i m e n s i o n s  
2 3 - 5 / 8 ( 6 0 0 )  
S u s p e n s i o n b o l t p i t c h  
1 1 - 5 / 3 2 1 ( - 3 2 / 1 8 6 ( 3 3 0 ) )  
8 - 1 5 / 3 2  
2 4 - 1 9 / 3 2 ( 6 2 5 )  
1 3 - 5 / 3 2 ( 3 3 4 )  
2 1 - 1 / 3 2 ( 5 3 4 )  
1 2 - 7 / 1 6  
1 - 2 5 / 3 2  
4 - 1 9 / 3 2  
1 2 - 7 / 8  
1 - 2 5 / 3 2  
5 - 9 / 1 6  
1 - 9 / 3 2 2 - 3 / 4  
3 - 5 / 8  
7 - 2 3 / 3 2  
Unit : inch (mm)  
18  
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Outdoor Unit CU-KE12NK1  
21-3/16  
3-19/32  
15/32  
10-13/16  
Wide tube service valve  
dia.3/8" (9.52)  
28-11/32 (720)  
2-1/8  
Narrow tube service valve  
dia.1/4" (6.35)  
6-3/32  
Unit : inch (mm)  
(852-0-0010-12700-0)  
19  
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Outdoor Unit CU-KE18NKU  
23-15/16  
5-11/32  
15/32  
11-17/32  
Wide tube service valve  
dia.1/2" (12.70)  
34-21/32(880)  
2-17/32  
Narrow tube service valve  
dia.1/4" (6.35)  
3/32  
5-23/32  
1-13/16  
2-13/32  
Unit : inch (mm)  
(852-0-0010-13200-0)  
20  
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4. REFRIGERANT FLOW DIAGRAM  
4-1. Refrigerant Flow Diagram  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit CU-KE12NK1  
Indoor unit  
Outdoor unit  
Accumulator  
Wide tube  
service  
valve  
Wide tube  
High pressure  
switch  
Muffler  
O.D.  
3/8"  
H.P.  
(9.52 mm)  
4-way  
valve  
Capillary  
tube for  
split flow  
Electric  
expansion  
valve  
Narrow  
tube  
service  
valve  
M
Narrow tube  
Cooling cycle  
(Defrosting cycle)  
Muffler  
Strainer  
O.D.  
1/4"  
(6.35 mm)  
Heating cycle  
21  
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Indoor Unit  
CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU  
Indoor unit  
Outdoor unit  
Accumulator  
Wide tube  
service  
valve  
Wide tube  
High pressure  
switch  
Muffler  
O.D.  
1/2"  
H.P.  
(12.7mm)  
4-way  
valve  
Capillary  
tube for  
split flow  
Electric  
expansion  
valve  
Narrow  
tube  
service  
valve  
M
Narrow tube  
Cooling cycle  
(Defrosting cycle)  
Strainer  
O.D.  
1/4"  
(6.35 mm)  
Heating cycle  
22  
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5. PERFORMANCE DATA  
5-1. Temperature Charts  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit  
CU-KE12NK1  
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 115V)  
(1) Low pressure performance chart  
Lo Fan  
Hi Fan  
131  
(0.9)  
102  
(0.7)  
73  
(0.5)  
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
(2) Operating current performance chart  
15  
Lo Fan  
Hi Fan  
14  
13  
12  
11  
10  
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
(3) Indoor discharge air performance chart  
68  
(20)  
Lo Fan  
Hi Fan  
59  
(15)  
50  
(10)  
41  
(5)  
32  
(0)  
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
NOTE  
Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.  
23  
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Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit  
CU-KE12NK1  
Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 115V)  
(1) High pressure performance chart  
508  
(3.5)  
435  
(3.0)  
363  
(2.5)  
290  
(2.0)  
218  
(1.5)  
23  
5)  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(
-
Outdoor inlet air DB temp. °F(°C)  
(2) Operating current performance chart  
17  
16  
15  
14  
13  
12  
11  
23  
5)  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(-  
Outdoor inlet air DB temp. °F(°C)  
(3) Indoor discharge air performance chart  
131  
(55)  
122  
(50)  
113  
(45)  
104  
(40)  
95  
(35)  
86  
(30)  
77  
(25)  
68  
(20)  
23  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(
-
5)  
Outdoor inlet air DB temp. °F(°C)  
NOTE  
Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.  
Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in  
heating mode. (Refer to "8-2. Protective Functions Overload prevention during heating.")  
24  
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Indoor Unit  
CS-KE18NB4UW & CZ-18BT1U Outdoor Unit  
CU-KE18NKU  
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)  
(1) Low pressure performance chart  
Lo Fan  
Hi Fan  
131  
(0.9)  
102  
(0.7)  
73  
(0.5)  
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
(2) Operating current performance chart  
10  
Lo Fan  
Hi Fan  
9
8
7
6
5
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
(3) Indoor discharge air performance chart  
68  
(20)  
Lo Fan  
Hi Fan  
59  
(15)  
50  
(10)  
41  
(5)  
32  
(0)  
77  
(25)  
86  
(30)  
95  
(35)  
104  
(40)  
Outdoor inlet air DB temp. °F(°C)  
NOTE  
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.  
25  
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Indoor Unit  
CS-KE18NB4UW & CZ-18BT1U Outdoor Unit  
CU-KE18NKU  
Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (60Hz, 230V)  
(1) High pressure performance chart  
508  
(3.5)  
435  
(3.0)  
363  
(2.5)  
290  
(2.0)  
218  
(1.5)  
23  
5)  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(
-
Outdoor inlet air DB temp. °F(°C)  
(2) Operating current performance chart  
12  
11  
10  
9
8
7
6
23  
5)  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(
-
Outdoor inlet air DB temp. °F(°C)  
(3) Indoor discharge air performance chart  
131  
(55)  
122  
(50)  
113  
(45)  
104  
(40)  
95  
(35)  
86  
(30)  
77  
(25)  
68  
(20)  
23  
32  
(0)  
41  
(5)  
50  
(10)  
59  
(15)  
68  
(20)  
77  
(25)  
(
-
5)  
Outdoor inlet air DB temp. °F(°C)  
NOTE  
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.  
• Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in  
heating mode. (Refer to "8-2. Protective Functions Overload prevention during heating.")  
26  
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5-2. Cooling Capacity  
Indoor Unit  
: CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit : CU-KE12NK1  
Power Supply : 115V Single Phase 60Hz  
< Cooling Capacity >  
RATING CAPACITY:  
11,900 BTU/h  
AIR FLOW RATE:  
OUTDOOR  
AMBIENT TEMP. oF (oC)  
235 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  
CI  
8,350  
0.79  
8,570  
0.93  
8,800  
1.06  
8,930  
1.16  
9,210  
1.25  
7,830  
1.07  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
6,340  
7,210  
8,120  
8,350  
8,350  
6,430  
7,300  
8,210  
8,570  
8,570  
6,570  
7,440  
8,350  
8,800  
8,800  
6,610  
7,480  
8,400  
8,930  
8,930  
6,800  
7,660  
8,530  
9,210  
9,210  
6,060  
6,930  
7,830  
7,830  
7,830  
59  
(15.0)  
TC  
CI  
12,230  
0.80  
12,030  
0.94  
11,790  
1.08  
11,580  
1.18  
10,580  
1.25  
7,950  
1.07  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
7,070  
7,940  
8,850  
9,720  
10,590  
6,930  
7,800  
8,720  
9,590  
10,450  
6,840  
7,710  
8,580  
9,450  
10,360  
6,700  
7,570  
8,490  
9,360  
10,230  
6,200  
7,070  
7,980  
8,850  
9,720  
4,970  
5,840  
6,750  
7,620  
7,950  
63  
(17.2)  
TC  
CI  
12,460  
0.82  
12,290  
0.96  
12,070  
1.10  
# 11,900  
1.20  
10,700  
1.25  
8,040  
1.07  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
5,790  
6,660  
7,570  
8,440  
9,310  
5,700  
6,570  
7,480  
8,350  
9,220  
5,610  
6,480  
7,390  
8,260  
9,130  
5,520  
6,380  
7,300  
8,170  
9,040  
4,970  
5,880  
6,750  
7,620  
8,490  
3,870  
4,740  
5,650  
6,520  
7,390  
67  
(19.4)  
TC  
CI  
12,640  
0.84  
12,490  
0.98  
12,300  
1.13  
12,170  
1.22  
10,770  
1.25  
8,100  
1.07  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
4,460  
5,330  
6,250  
7,120  
7,980  
4,420  
5,290  
6,200  
7,070  
7,940  
4,330  
5,200  
6,110  
6,980  
7,850  
4,280  
5,150  
6,060  
6,930  
7,800  
3,690  
4,560  
5,470  
6,340  
7,210  
2,680  
3,550  
4,460  
5,330  
6,200  
71  
(21.7)  
TC  
12,730  
12,610  
12,450  
12,370  
10,780  
8,120  
75  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
4,050  
4,970  
5,840  
6,700  
4,010  
4,920  
5,790  
6,660  
3,960  
4,880  
5,740  
6,610  
3,920  
4,830  
5,700  
6,570  
3,370  
4,280  
5,150  
6,020  
2,450  
3,370  
4,240  
5,100  
(23.9)  
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.  
27  
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Indoor Unit  
: CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit : CU-KE18NKU  
Power Supply : 230V Single Phase 60Hz  
< Cooling Capacity >  
RATING CAPACITY:  
17,500 BTU/h  
AIR FLOW RATE:  
OUTDOOR  
AMBIENT TEMP. oF (oC)  
341 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  
CI  
12,260  
1.15  
12,550  
1.34  
12,830  
1.54  
13,060  
1.72  
13,460  
1.67  
9,520  
1.30  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
9,140  
10,330  
11,590  
12,260  
12,260  
9,270  
10,470  
11,720  
12,550  
12,550  
9,400  
10,600  
11,860  
12,830  
12,830  
9,540  
9,740  
10,930  
12,190  
13,380  
13,460  
7,810  
9,010  
9,520  
9,520  
9,520  
59  
10,730  
11,990  
13,060  
13,060  
(15.0)  
TC  
CI  
18,110  
1.17  
17,790  
1.37  
17,400  
1.57  
17,000  
1.75  
14,080  
1.67  
9,650  
1.30  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
10,400  
11,590  
12,850  
14,040  
15,240  
10,200  
11,390  
12,650  
13,850  
15,110  
10,000  
11,190  
12,450  
13,650  
14,840  
9,800  
8,340  
9,540  
10,800  
11,990  
13,180  
6,290  
7,480  
8,740  
9,650  
9,650  
63  
11,000  
12,260  
13,450  
14,640  
(17.2)  
TC  
CI  
18,510  
1.19  
18,220  
1.40  
17,860  
1.60  
# 17,500  
1.79  
14,220  
1.67  
9,750  
1.30  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
8,680  
9,870  
11,130  
12,320  
13,510  
8,480  
9,740  
10,930  
12,190  
13,380  
8,340  
9,540  
10,800  
11,990  
13,180  
8,140  
6,620  
7,880  
9,070  
10,330  
11,530  
4,830  
6,020  
7,280  
8,480  
9,670  
67  
9,340  
(19.4)  
10,600  
11,790  
12,980  
TC  
CI  
18,820  
1.22  
18,570  
1.43  
18,260  
1.64  
17,940  
1.83  
14,290  
1.67  
9,810  
1.30  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
6,750  
7,950  
9,210  
10,470  
11,660  
6,690  
7,880  
9,140  
10,330  
11,530  
6,550  
7,750  
9,010  
10,200  
11,390  
6,420  
7,610  
8,870  
10,070  
11,260  
4,900  
6,090  
7,350  
8,540  
9,740  
3,240  
4,430  
5,690  
6,890  
8,080  
71  
(21.7)  
TC  
CI  
19,010  
1.25  
18,800  
1.46  
18,530  
1.68  
18,260  
1.87  
14,280  
1.67  
9,810  
1.30  
75  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
6,160  
7,420  
8,610  
9,800  
6,090  
7,350  
8,540  
9,740  
5,960  
7,220  
8,410  
9,670  
5,890  
7,150  
8,340  
9,540  
4,430  
5,690  
6,890  
8,080  
2,970  
4,230  
5,430  
6,620  
(23.9)  
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.  
28  
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5-3. Cooling Capacity (Low Ambient)  
Indoor Unit  
: CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit : CU-KE12NK1  
Power Supply : 115V Single Phase 60Hz  
< Cooling Capacity (Low Ambient) >  
RATING CAPACITY:  
11,900 BTU/h  
AIR FLOW RATE:  
235 CFM  
INDOOR  
OUTDOOR  
ENT. TEMP. oF (oC)  
AMBIENT TEMP. oF (oC)  
WB  
DB  
0
5
15  
25  
35  
45  
55  
(-17.8)  
9,530  
0.47  
(-15.0)  
(-9.4)  
(-3.9)  
(1.7)  
(7.2)  
(12.8)  
TC  
CI  
9,550  
0.50  
9,560  
0.47  
9,590  
0.46  
9,600  
0.46  
9,590  
0.51  
9,570  
0.55  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
6,930  
7,800  
8,720  
9,530  
9,530  
6,930  
7,800  
8,720  
9,550  
9,550  
6,980  
7,850  
8,720  
9,560  
9,560  
8,580  
9,450  
9,590  
9,590  
9,590  
6,980  
7,850  
8,760  
9,600  
9,600  
6,980  
7,850  
8,760  
9,590  
9,590  
6,980  
7,850  
8,760  
9,570  
9,570  
59  
(15.0)  
TC  
CI  
9,440  
0.53  
9,460  
0.56  
9,530  
0.51  
9,590  
0.49  
9,650  
0.49  
9,660  
0.53  
9,670  
0.57  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
5,650  
6,520  
7,440  
8,300  
9,170  
5,650  
6,520  
7,440  
8,300  
9,170  
5,700  
6,570  
7,480  
8,350  
9,220  
8,580  
9,450  
9,590  
9,590  
9,590  
5,740  
6,610  
7,530  
8,400  
9,270  
5,740  
6,610  
7,530  
8,400  
9,270  
5,790  
6,660  
7,530  
8,400  
9,270  
63  
(17.2)  
TC  
CI  
9,250  
0.61  
9,290  
0.63  
9,410  
0.57  
9,530  
0.54  
9,620  
0.52  
9,670  
0.56  
9,720  
0.59  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
4,370  
5,240  
6,160  
7,020  
7,890  
4,370  
5,240  
6,160  
7,020  
7,890  
4,420  
5,290  
6,200  
7,070  
7,940  
8,580  
9,450  
9,530  
9,530  
9,530  
4,510  
5,380  
6,290  
7,160  
8,030  
4,560  
5,420  
6,340  
7,210  
8,080  
4,560  
5,420  
6,340  
7,210  
8,080  
67  
(19.4)  
TC  
CI  
8,950  
0.68  
9,010  
0.71  
9,210  
0.63  
9,380  
0.58  
9,520  
0.56  
9,610  
0.60  
9,710  
0.62  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
3,000  
3,870  
4,780  
5,650  
6,520  
3,050  
3,920  
4,830  
5,700  
6,570  
3,090  
3,960  
4,880  
5,740  
6,610  
8,580  
9,380  
9,380  
9,380  
9,380  
3,230  
4,100  
5,010  
5,880  
6,750  
3,280  
4,140  
5,060  
5,930  
6,800  
3,280  
4,140  
5,060  
5,930  
6,800  
71  
(21.7)  
TC  
CI  
8,590  
0.76  
8,650  
0.79  
8,930  
0.69  
9,160  
0.63  
9,360  
0.60  
9,480  
0.63  
9,620  
0.64  
75  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
2,590  
3,500  
4,370  
5,240  
2,640  
3,550  
4,420  
5,290  
2,730  
3,640  
4,510  
5,380  
9,160  
9,160  
9,160  
9,160  
2,860  
3,780  
4,650  
5,520  
2,910  
3,820  
4,690  
5,560  
2,960  
3,870  
4,740  
5,610  
(23.9)  
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.  
29  
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Indoor Unit  
: CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit : CU-KE18NKU  
Power Supply : 230V Single Phase 60Hz  
< Cooling Capacity (Low Ambient) >  
RATING CAPACITY:  
17,500 BTU/h  
AIR FLOW RATE:  
341 CFM  
INDOOR  
OUTDOOR  
ENT. TEMP. oF (oC)  
AMBIENT TEMP. oF (oC)  
WB  
DB  
0
5
15  
25  
35  
45  
55  
(-17.8)  
(-15.0)  
(-9.4)  
(-3.9)  
(1.7)  
(7.2)  
(12.8)  
TC  
CI  
13,400  
0.69  
13,430  
0.73  
13,440  
0.76  
13,470  
0.66  
13,500  
0.66  
13,520  
0.66  
13,510  
0.70  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
9,740  
10,930  
12,190  
13,380  
13,400  
9,740  
10,930  
12,190  
13,380  
13,430  
9,740  
10,930  
12,190  
13,380  
13,440  
11,860  
13,050  
13,470  
13,470  
13,470  
9,740  
11,000  
12,190  
13,380  
13,500  
9,800  
11,000  
12,260  
13,450  
13,520  
9,800  
11,000  
12,190  
13,450  
13,510  
59  
(15.0)  
TC  
CI  
13,260  
0.78  
13,300  
0.82  
13,370  
0.84  
13,480  
0.71  
13,560  
0.70  
13,640  
0.69  
13,670  
0.72  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
7,950  
9,140  
10,400  
11,590  
12,790  
7,950  
9,140  
10,400  
11,590  
12,790  
7,950  
9,210  
10,400  
11,590  
12,850  
11,860  
13,050  
13,480  
13,480  
13,480  
8,080  
9,270  
10,530  
11,720  
12,920  
8,080  
9,270  
10,530  
11,720  
12,980  
8,140  
9,340  
10,600  
11,790  
12,980  
63  
(17.2)  
TC  
CI  
12,980  
0.89  
13,040  
0.92  
13,170  
0.93  
13,380  
0.78  
13,530  
0.75  
13,670  
0.72  
13,760  
0.75  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
6,090  
7,280  
8,540  
9,740  
11,000  
6,160  
7,350  
8,610  
9,800  
11,000  
6,220  
7,420  
8,680  
9,870  
11,060  
11,860  
13,050  
13,380  
13,380  
13,380  
6,360  
7,550  
8,810  
10,000  
11,190  
6,420  
7,610  
8,870  
10,070  
11,260  
6,420  
7,680  
8,870  
10,070  
11,330  
67  
(19.4)  
TC  
CI  
12,550  
1.00  
12,630  
1.03  
12,830  
1.03  
13,160  
0.85  
13,390  
0.80  
13,600  
0.76  
13,750  
0.77  
72 (22.2) SHC  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
4,230  
5,430  
6,690  
7,880  
9,070  
4,230  
5,490  
6,690  
7,950  
9,140  
4,370  
5,560  
6,820  
8,010  
9,210  
11,860  
13,050  
13,160  
13,160  
13,160  
4,570  
5,760  
7,020  
8,210  
9,400  
4,630  
5,820  
7,080  
8,280  
9,470  
4,700  
5,890  
7,150  
8,340  
9,540  
71  
(21.7)  
TC  
CI  
12,010  
1.11  
12,110  
1.14  
12,380  
1.13  
12,850  
0.92  
13,150  
0.86  
13,440  
0.80  
13,650  
0.80  
75  
76 (24.4) SHC  
80 (26.7) SHC  
84 (28.9) SHC  
88 (31.1) SHC  
3,640  
4,900  
6,090  
7,280  
3,700  
4,960  
6,160  
7,350  
3,770  
5,030  
6,220  
7,420  
12,850  
12,850  
12,850  
12,850  
4,030  
5,290  
6,490  
7,680  
4,170  
5,360  
6,620  
7,810  
4,230  
5,490  
6,690  
7,880  
(23.9)  
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.  
30  
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5-4. Heating Capacity  
Indoor Unit  
: CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit : CU-KE12NK1  
Power Supply : 115V Single Phase 60Hz  
< Heating Capacity >  
RATING CAPACITY:  
13,600 BTU/h  
AIR FLOW RATE:  
268 CFM  
OUTDOOR  
INDOOR  
ENT. TEMP. oF (oC)  
AMBIENT TEMP. oF (oC)  
WB  
60  
65  
70  
75  
80  
(15.6)  
(18.3)  
(21.1)  
(23.9)  
(26.7)  
0 (-17.8)  
3 (-16.1)  
8 (-13.3)  
13 (-10.6)  
18 (-7.8)  
23 (-5.0)  
28 (-2.2)  
33 (0.6)  
38 (3.3)  
43 (6.1)  
48 (8.9)  
53 (11.7)  
58 (14.4)  
63 (17.2)  
65 (18.3)  
TH  
CI  
7,510  
0.84  
7,540  
0.88  
7,560  
0.92  
7,580  
0.96  
7,590  
1.00  
TH  
CI  
7,760  
0.86  
7,790  
0.90  
7,810  
0.94  
7,830  
0.98  
7,840  
1.02  
TH  
CI  
8,350  
0.89  
8,380  
0.94  
8,410  
0.98  
8,420  
1.03  
8,440  
1.07  
TH  
CI  
8,980  
0.93  
9,000  
0.98  
9,030  
1.03  
9,050  
1.08  
9,060  
1.12  
TH  
CI  
9,660  
0.98  
9,690  
1.03  
9,720  
1.08  
9,730  
1.13  
9,750  
1.18  
TH  
CI  
10,390  
1.03  
10,420  
1.08  
10,440  
1.14  
10,460  
1.19  
10,470  
1.25  
TH  
CI  
11,150  
1.08  
11,180  
1.14  
11,200  
1.20  
11,210  
1.26  
11,220  
1.32  
TH  
CI  
11,930  
1.13  
11,960  
1.20  
11,980  
1.26  
12,000  
1.33  
11,740  
1.39  
TH  
CI  
12,720  
1.19  
12,750  
1.26  
12,770  
1.33  
12,780  
1.40  
11,740  
1.44  
TH  
CI  
13,560  
1.25  
13,580  
1.32  
#
13,600  
1.40  
13,010  
1.44  
11,740  
1.44  
TH  
CI  
14,420  
1.31  
14,440  
1.39  
14,120  
1.44  
13,010  
1.44  
11,740  
1.44  
TH  
CI  
15,290  
1.44  
15,020  
1.44  
14,200  
1.44  
13,010  
1.44  
11,740  
1.44  
TH  
CI  
15,990  
1.44  
15,080  
1.44  
14,240  
1.44  
13,010  
1.44  
11,740  
1.44  
TH  
CI  
16,000  
1.44  
15,070  
1.44  
14,220  
1.44  
13,010  
1.44  
11,740  
1.44  
TH  
CI  
15,980  
1.44  
15,050  
1.44  
14,190  
1.44  
13,010  
1.44  
11,740  
1.44  
TH : Total Heating Capacity (BTU/h)  
NOTE  
1.  
Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB  
: Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB  
2.  
Above data does not take Defrost Operation, Overload Prevention Protection, and/or Cold Air  
Prevention Protection during heating operation into account. For this reason, the value may vary  
from the actual heating characteristics.  
3. Above data represents the value when the operation frequency of a compressor is fixed.  
31  
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Indoor Unit  
: CS-KE18NB4UW & CZ-18BT1U  
Outdoor Unit : CU-KE18NKU  
Power Supply : 230V Single Phase 60Hz  
< Heating Capacity >  
RATING CAPACITY:  
20,400 BTU/h  
AIR FLOW RATE:  
383 CFM  
OUTDOOR  
INDOOR  
ENT. TEMP. oF (oC)  
AMBIENT TEMP. oF (oC)  
WB  
60  
65  
70  
75  
80  
(15.6)  
(18.3)  
(21.1)  
(23.9)  
(26.7)  
0 (-17.8)  
3 (-16.1)  
8 (-13.3)  
13 (-10.6)  
18 (-7.8)  
23 (-5.0)  
28 (-2.2)  
33 (0.6)  
38 (3.3)  
43 (6.1)  
48 (8.9)  
53 (11.7)  
58 (14.4)  
63 (17.2)  
65 (18.3)  
TH  
CI  
11,350  
1.35  
11,400  
1.41  
11,440  
1.47  
11,480  
1.53  
11,510  
1.59  
TH  
CI  
11,720  
1.37  
11,770  
1.44  
11,820  
1.50  
11,850  
1.56  
11,890  
1.62  
TH  
CI  
12,600  
1.43  
12,650  
1.50  
12,700  
1.57  
12,750  
1.64  
12,780  
1.71  
TH  
CI  
13,520  
1.50  
13,580  
1.57  
13,630  
1.65  
13,670  
1.72  
13,710  
1.80  
TH  
CI  
14,540  
1.57  
14,600  
1.65  
14,650  
1.74  
14,700  
1.82  
14,730  
1.90  
TH  
CI  
15,610  
1.65  
15,670  
1.74  
15,730  
1.83  
15,770  
1.92  
15,810  
2.00  
TH  
CI  
16,730  
1.74  
16,800  
1.83  
16,850  
1.93  
16,890  
2.02  
16,770  
2.12  
TH  
CI  
17,900  
1.83  
17,960  
1.93  
18,010  
2.04  
18,060  
2.14  
16,770  
2.24  
TH  
CI  
19,050  
1.92  
19,120  
2.03  
19,170  
2.14  
18,590  
2.25  
16,770  
2.36  
TH  
CI  
20,290  
2.02  
20,350  
2.14  
#
20,400  
2.26  
18,590  
2.38  
16,770  
2.50  
TH  
CI  
21,550  
2.13  
21,610  
2.26  
20,410  
2.39  
18,590  
2.52  
16,770  
2.64  
TH  
CI  
22,830  
2.39  
22,230  
2.53  
20,410  
2.53  
18,590  
2.66  
16,770  
2.80  
TH  
CI  
23,990  
2.37  
22,230  
2.52  
20,410  
2.67  
18,590  
2.81  
16,770  
2.96  
TH  
CI  
23,990  
2.51  
22,230  
2.67  
20,410  
2.82  
18,590  
2.98  
16,770  
3.13  
TH  
CI  
23,990  
2.57  
22,230  
2.73  
20,410  
2.89  
18,590  
3.05  
16,770  
3.21  
TH : Total Heating Capacity (BTU/h)  
NOTE  
1.  
Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB  
: Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB  
2.  
Above data does not take Defrost Operation, Overload Prevention Protection, and/or Cold Air  
Prevention Protection during heating operation into account. For this reason, the value may vary  
from the actual heating characteristics.  
3. Above data represents the value when the operation frequency of a compressor is fixed.  
32  
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6. ELECTRICAL DATA  
6-1. Electrical Characteristics  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
Outdoor Unit CU-KE12NK1  
Cooling  
Indoor Unit  
Fan Motor  
Outdoor Unit  
Fan Motor + Compressor  
115V Single-phase 60Hz  
12.39  
Complete Unit  
Performance at  
Rating conditions  
Running amp.  
A
0.21  
18  
12.6  
Power input  
W
1,242  
1,260  
Rating conditions:  
Indoor air temperature:  
Outdoor air temperature:  
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB  
95 °F (35 °C) DB  
Heating  
Indoor Unit  
Fan Motor  
Outdoor Unit  
Complete Unit  
Fan Motor + Compressor  
115V Single-phase 60Hz  
14.35  
Performance at  
Rating conditions  
Running amp.  
Power input  
A
0.25  
20  
14.6  
W
1,440  
1,460  
Rating conditions:  
Indoor air temperature  
Outdoor air temperature  
70 °F (21.1 °C) DB  
47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB  
33  
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Indoor Unit  
CZ-KE18NB4U & CZ-18BT1U  
Outdoor Unit CU-KE18NKU  
(1) Voltage:230V  
Cooling  
<
230V >  
Indoor Unit  
Fan Motor  
Outdoor Unit  
Fan Motor + Compressor  
230V Single-phase 60Hz  
8.15  
Complete Unit  
Performance at  
Rating conditions  
Running amp.  
A
0.15  
22  
8.3  
Power input  
W
1,838  
1,860  
Rating conditions:  
Indoor air temperature:  
Outdoor air temperature:  
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB  
95 °F (35 °C) DB  
Heating  
Indoor Unit  
Fan Motor  
Outdoor Unit  
Complete Unit  
Fan Motor + Compressor  
230V Single-phase 60Hz  
10.31  
Performance at  
Rating conditions  
Running amp.  
Power input  
0.19  
27  
10.5  
A
2,313  
2,340  
W
Rating conditions:  
Indoor air temperature  
Outdoor air temperature  
70 °F (21.1 °C) DB  
47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB  
(2) Voltage:208V  
Cooling  
<
208V >  
Indoor Unit  
Outdoor Unit  
Complete Unit  
Fan Motor  
Fan Motor + Compressor  
Performance at  
208V Single-phase 60Hz  
Rating conditions  
Running amp.  
Power input  
0.16  
22  
8.94  
9.1  
A
1,838  
1,860  
W
Rating conditions:  
Indoor air temperature:  
Outdoor air temperature:  
80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB  
95 °F (35 °C) DB  
Heating  
Indoor Unit  
Fan Motor  
Outdoor Unit  
Complete Unit  
Fan Motor + Compressor  
Performance at  
208V Single-phase 60Hz  
Rating conditions  
Running amp.  
Power input  
0.2  
27  
11.3  
11.5  
A
2,313  
2,340  
W
Rating conditions:  
Indoor air temperature  
Outdoor air temperature  
70 °F (21.1 °C) DB  
47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB  
34  
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6-2. Electric Wiring Diagrams  
Indoor Unit  
CS-KE12NB41 & CZ-18BT1U  
CS-KE18NB4UW & CZ-18BT1U  
C O I L - 1  
B L K  
B L K  
O R O M  
B L K  
B L K  
B L K  
B L K  
S T W A I T C F H
O R G  
B L U  
B R N  
W H T  
B L K  
W H T  
B R N  
B L U  
O R G  
B L K  
W H T  
B R N  
B L U  
O R G  
B L K  
T V L  
B L U  
P N K  
Y E L  
O R G  
R E D  
B R N  
G R N  
B L K  
W H T  
G R N / Y E L  
Y E L / ( R E D )  
Y E L / ( R E D )  
B L U  
Y E L  
W H T  
B L K  
R E D  
R E D  
W H T  
B L K  
C O R E  
F E R R I T E  
35  
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Outdoor Unit CU-KE12NK1  
8FA2-5251-12200-2  
36  
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Outdoor Unit CU-KE18NKU  
REACTANCE  
BLK  
WHT  
WHT  
POWER RELAY  
6
5
1 2  
1 2  
1
4
BLK  
w
w
w
w
w
E
TERMINAL  
PLATE  
L1  
L2  
E2  
E1  
FERRITE CORE  
w
w
w
U
V
25A  
w
BLK  
WHT  
RED  
ACIN1  
1
2
w
w
ACIN2  
CONTROLLER  
W
3
GND  
SI-A  
4
5
6
RV0 RV1  
BLK  
1 2 3  
1 2 3  
COMP  
1 2  
A-TH  
COIL/OUTDOOR  
DCFM  
MV0  
1 2 3 4 5  
1 2 3 4 5  
w
w
1 2 3 4 1 2 3 4  
1 2 3 4 5 6 7  
WHT  
1 2 1 2 3 4 1 2 3 4  
N
L
POWER  
SUPPLY  
1 2  
3 4 5 6 7  
1 2 3 4 5 6 7  
1 2  
1 2  
1 2 3 4 5  
1 2 3 4 5  
HIGH PRESSURE  
SWITCH  
BLK  
BLK  
MV0  
S
R
T
1 1  
2 2  
FM  
MAGNETIC COIL RV  
CM  
2P-CONNECTOR (BLK)  
FAN MOTOR  
4WAY VALVE  
COIL  
COMPRESSOR  
MOTOR  
OVERLOAD RELAY  
(OLR)  
WHT  
WHT  
WHT  
WHT  
1
2
1
2
ELEC SYSTEM ASSY  
*
2P-CONNECTOR (RED)  
8FA2-5251-11900-2  
37  
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Ta b  
7. MAINTENANCE  
7-1. Address Setting of the Remote  
Controller  
The address can be set in order to prevent  
interference between remote controllers when two  
indoor units are installed near each other. The  
address is normally set to "A." To set a different  
address, it is necessary to change the address on the  
second remote controller.  
Fig. 1  
NOTE  
Once changed, you cannot restore the original  
address setting of the air conditioner.  
(1) Switch on the power source.  
(2) Break the address-setting tab marked "A" on the  
second remote controller to change the address  
(Fig. 1). When the tab is removed, the address is  
automatically set to B (Fig. 2).  
ACL button  
Fig. 2  
(3) Press and hold the remote controller HIGH  
POWER button and 1 HR TIMER button. Then,  
press and hold the ACL (reset) button with a  
pointed object such as the tip of a pen. After 5  
seconds, release ACL button first, then release  
HIGH POWER and 1 HR. TIMER buttons, "oP-1"  
(test run) appears, blinking in the remote  
controller clock display area.  
(4) Each time the 1 HR TIMER button is pressed, the  
display changes as shown below. Press this  
button 2 times to change the display to "oP-7"  
(address setting). (Fig. 3)  
ON/OFF  
operation  
button  
Test run mode  
HIGH POWER  
button  
Self-diagnostic mode  
Address setting mode  
1HR.  
TIMER  
button  
(5) "oP-7" has now been selected for address setting.  
(6) Press the ON/OFF operation button on the remote  
controller. (Fig. 3) Check that the "beep" signal  
received sound is heard from the second indoor  
unit (approximately 5 times). The sound you hear  
is the signal that the remote controller address  
has been changed.  
(7) Finally press the remote controller ACL (reset)  
button to cancel the blinking "oP-7" display. (Fig.  
3)  
ACL  
(Reset)  
button  
Changing of the second remote controller address is  
now completed.  
Fig. 3  
38  
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7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit  
One of the two types of connectors illustrated at left is used.Their  
basic structure is the same for each.  
How to Disconnect  
Hold the resin connector cover, and pull the connector off.  
You cannot disconnect the connector by pulling the wire since  
it is locked inside. Always hold the cover to disconnect. (See  
illustration at left.) For the connector without the resin cover,  
push the lock in the direction of "2" while pulling it off.  
Pull the cover upward  
How to Connect  
In order to connect, hold the resin cover of the connector and  
push it in. Confirm the click sound for the inside lock.  
When the cover is pulled upward, the lock is  
released with the sequence of 1 and 2.  
39  
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7-3. Disassembly Procedure  
To avoid electrical shock hazard, be sure to disconnect power before  
WARNING  
attempting to disassemble the unit.  
When a footstool, etc. is used for disassembling the indoor unit,  
be careful not to fall down. If you fall down, you might be injured seriously.  
7-3-1. Remove the air intake grill.  
(1) Slide the 2 latches each to the corresponding arrow direction. (Fig. 1 and Fig. 2)  
Open downward the air intake grill located on the latch side.  
(2) Undo the air intake grill drop preventive hook. (Fig. 3)  
Undo the 2 hinges for the grill and remove the air intake grill.  
Latch  
Hinge  
Hook  
Latch  
Air intake grill  
Hinge  
Fig.1  
Fig.2  
Fig.3  
7-3-2. Disconnect the connectors in the control box.  
(1) Remove the 2 screws and remove the control box cover. (Fig. 4)  
(2) Disconnect the connectors CN04 (FLAP 5P), CN12 (RC 4P) and CN13 (IND 7P). (Fig. 5)  
CN04  
Control PCboard  
CN13  
CN12  
Screw  
Control box cover  
Fig.4  
Fig.5  
40  
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7-3-3. Remove the ceiling panel.  
(1) Open the clamp (4 locations) and remove the 2 lead wires from the clamps. (Fig. 6)  
(2) Remove the 4 screws fixing the corner cover (at 3 locations) and indicator cover (at 1 location). (Fig. 6)  
(3) Press the center 1 of the cover and remove the cover with the section 2 pulled down. (Fig. 7)  
(4) Remove the strap (3 locations) from the hook on the ceiling panel. (Fig. 8)  
NOTE  
There is no strap on the indicator cover.  
(5) Remove the bolt (4 locations) with a washer and remove the ceiling panel. (Fig. 9)  
Screw  
Clamp  
Corner cover  
Indicator  
cover  
Pull down  
section 2.  
Lead wire  
Cover  
Clamp  
Center 1  
Corner cover  
Corner cover  
Screw  
Fig.6  
Fig.7  
Bolt  
Strap  
Remove the strap  
from the hook.  
Bolt  
Fig.8  
Fig.9  
41  
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7-3-4. Remove the indoor air temperature sensor.  
(1) Disconnect the connector CN08 (ROOM 2P) in the control box and remove the indoor air temperature  
sensor. (Fig. 10)  
Indoor air temperature sensor  
CN08  
Fig.10  
7-3-5. Remove the power box and control box.  
(1) Remove a screw and remove the terminal cover. (Fig. 11)  
(2) Remove the 2 screws and remove the power box cover. (Fig. 11)  
(3) Disconnect the power lines (No. 1 and No. 2) / signal line (No. 3) and ground cable from the terminals in  
the power box. (Fig. 12)  
Terminal cover  
Screw  
Screw  
Power box cover  
Fig.11  
Terminal  
Ground cable  
Power lines / Signal line  
Fig.12  
42  
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(4) Disconnect the connector CN07 (DP 2P) in the power box. (Fig. 13)  
Remove a screw and disconnect the ground cable. (Fig. 13)  
(5) Disconnect the connector CN03 (DCM 6P) in the power box. (Fig. 14)  
(6) Remove the 4 screws and remove the power box. (Fig. 14)  
(7) Disconnect the connectors CN06 (FS 3P) and CN09 (COIL-1 2P) in the control box. (Fig. 15)  
(8) Remove the 2 screws and remove the control box. (Fig. 15)  
Screw  
Ground cable  
1
2
3
CN07  
Fig.13  
Screw  
Screw  
Screw  
Screw  
CN03  
Fig.14  
CN09  
Screw  
Screw  
CN06  
Fig.15  
43  
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For the removal of the following components, perform any work after removing the indoor  
unit (main body) from the ceiling.  
NOTE  
Main body lower section  
Float switch  
Heat exchanger sensor  
Turbo fan  
Drain pump  
Fan motor  
Heat exchanger  
1. Perform the work after draining the water to prevent the water leakage from the drain pan.  
Put a bucket, etc., under the drain cap and remove the drain cap to drain the water.  
(Fig. 16)  
2. Refer to the installation instructions for recovery of refrigerant or removal of the power  
cable or tubing.  
7-3-6. Remove the main body lower section.  
(1) Remove the 4 screws. (Fig. 16)  
(2) Remove the 2 screws. (Fig. 17)  
(3) Disconnect the connector CN03 (DCM 6P) in the power box. (Fig. 18)  
(4) Lift the main body lower section and remove it from the main body upper section.  
Screw  
Screw  
Drain cap  
Main body lower section  
Main body lower section  
Screw  
Screw  
Fig.16  
Main body lower section  
Main body  
upper section  
Screw  
CN03  
Fig.17  
Fig.18  
44  
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7-3-7. Remove the heat exchanger sensor.  
(1) Remove the heat exchanger sensor from the sensor holder. (Fig. 19)  
Heat exchanger sensor  
Holder  
Fig.19  
7-3-8. Remove the drain pump and float switch.  
(1) Remove the 2 screws (Fig. 20)  
(2) Loosen the clamp and disconnect the drain hose from the drain pump. (Fig. 20)  
(3) Remove the drain pump from the main body upper section. (Fig. 20)  
(4) Remove a nut and remove the float switch. (Fig. 21)  
Screw  
Drain pump  
Float switch  
Nut  
Drain hose  
Clamp  
Fig.20  
Fig.21  
45  
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7-3-9. Remove the turbo fan and fan motor.  
(1) Remove a nut and remove the turbo fan. (Fig. 22)  
(2) Remove the 2 screws and 3 nuts, and remove the fan motor. (Fig. 23)  
Turbo fan  
Screw  
Nut  
Nut  
Fan motor  
Fig.22  
Fig.23  
7-3-10. Remove the heat exchanger.  
(1) Remove the 3 screws. (Fig. 24)  
(2) Remove the 3 screws. (Fig. 25)  
(3) Remove the heat exchanger from the main body upper section with the heat exchanger lifted.  
Heat exchanger  
Screw  
Screw  
Main body  
upper section  
Screw  
Fig.24  
Fig.25  
46  
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8. FUNCTIONS  
8-1. Operation Functions  
Emergency operation  
SENSOR DRY  
Emergency operation is available when the remote  
controller malfunctions, has been lost, or otherwise  
cannot be used.  
During DRY operation, the system adjusts the room  
temperature and fan speed according to the conditions in the  
room, in order to maintain a comfortable room environment.  
To operate the system, press the OPERATION button,  
which is also used as the receiver, below the unit display.  
Each time this button is pressed, the OPERATION lamp  
changes color to indicate the type of operation. Select the  
desired type of operation.  
SENSOR DRY operation  
• DRY operation is as shown in the figure below.  
Load  
COOL zone  
A zone  
COOL  
(GREEN)  
HEAT  
(RED)  
STOP  
(Lamp Off)  
B zone  
• The set temperature is 4°F(2°C) below the detected room  
temperature in the case of cooling operation, and 4°F(2°C)  
above the room temperature in the case of heating  
operation. The flap and fan speed settings are AUTO.  
Conditions are monitored at all  
times when the room temperature  
is below 59°F(15°C).  
DRY A  
The compressor operation frequency varies.  
The indoor fan operates with 1/f fluctuation.  
AUTO cooling/heating operation  
Selecting the operation mode  
DRY B  
• When AUTO mode is selected, the microprocessor calculates  
the difference between the set temperature and the room  
temperature, and automatically switches to Cooling or  
Heating mode.  
The compressor operates at a low operating frequency.  
The indoor fan operates with 1/f fluctuation.  
Monitor  
Room temp. Set temp.  
COOL  
• Monitoring operation takes place when the room temperature  
Room temp. Set temp.  
HEAT  
is below 59°F(15°C), or more than 5°F(3°C) below the set  
• As shown by the example in the figure below, with AUTO  
cooling/heating operation, the mode changes between  
Heating and Cooling mode according to changes in the  
relationship between the current room temperature and the  
set temperature.  
temperature.  
• When the monitoring range is entered, the compressor stops,  
and the indoor fan operates with 1/f fluctuation.  
Example  
PAM- control  
Example of operation in AUTO mode with the set room temperature  
at 74°F(23°C).  
• In order to further improve inverter performance, control is  
switched between PWM control at low operation speeds, and  
PAM control at high operation speeds, making the most  
effective use of power.  
Room temp.  
Zone A  
Zone B  
Zone C  
Zone C  
74  
Set temp.  
Zone B  
Zone A  
More than  
1 hour  
Within  
1 hour  
Compressor  
ON  
ON  
ON  
OFF  
OFF  
Operation mode  
Cooling  
Heating  
Cooling  
47  
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HIGH POWER  
NIGHT SETBACK  
This function acts to raise the power but keeps the AC system in  
the same operating mode.  
This function is set with the HIGH POWER button on the remote  
controller.  
(It can be set regardless of the temperature and fan speed  
settings.)  
When NIGHT SETBACK operation is set, the temperature and  
fan speed settings will be adjusted automatically to allow  
comfortable sleep.  
When NIGHT SETBACK operation is set, " mark" appears on  
the remote controller. The main unit display lamp also becomes  
dimmer.  
HIGH POWER operation from remote controller  
COOL and DRY modes  
The unit operates at maximum output for 30 minutes,  
regardless of the desired temperature.  
The fan speed is 1 step above "High."  
When the night setback mode is selected, the air conditioner  
automatically raises the temperature setting 2°F(1°C) when 30  
minutes have passed after the selection was made, and then  
another 2°F(1°C) after another 30 minutes have passed,  
regardless of the indoor temperature when night setback was  
selected. This enables you to save energy without sacrificing  
comfort. This function is convenient when gentle cooling is  
needed.  
Frequency  
MAX  
2°F(1°C)  
Setting  
Time  
0
temperature  
2°F(1°C)  
30 min.  
5 min.  
Press the NIGHT  
SETBACK button  
30 min.  
30 min.  
Start  
End  
Time  
NOTE  
When HIGH POWER operation ends, the unit operates at low  
Hz for 5 minutes, regardless of the thermostat OFF conditions.  
HEAT mode  
When in DRY mode, operation is in the cooling zone.  
When the night setback mode is selected, the air conditioner  
automatically lowers the temperature setting 4°F(2°C) when 30  
minutes have passed after the selection was made, and then  
another 4°F(2°C) after another 30 minutes have passed,  
regardless of the indoor temperature when night setback was  
selected. This enables you to save energy without sacrificing  
comfort. This function is convenient when gentle heating is  
needed.  
Lamp colors  
OPERATION lamp  
HEAT operation  
DRY operation  
Red  
Setting  
4°F(2°C)  
temperature  
Orange  
4°F(2°C)  
Time  
COOL operation  
FAN operation  
Green  
Green  
DEFROSTING operation  
Red and Orange  
alternately  
Press the NIGHT  
SETBACK button  
30 min.  
30 min.  
OPERATION lamp  
Green  
Green  
Green  
TIMER lamp  
HIGH POWER lamp  
Timer backup  
Operation stops if there are no operator controls for 25 hours or  
longer after unit operation switched from OFF to ON by use of  
ON timer operation.  
48  
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8-2. Protective Functions  
Overload prevention during heating  
Cold-air prevention during heating  
During HEAT operation, the temperature of the indoor heat  
exchanger is used to control the frequency and lessen the load  
on the compressor before the protective device is activated.  
During heating, the fan speed is set to "LL" (very low) or stopped.  
As the temperature of the indoor heat exchanger rises, the fan  
speed is changed to the set speed.  
Indoor heat exchanger  
Approx.  
127  
Set fan speed  
A
High  
A. Control start  
B. Control end  
(53)  
At stability of operation  
Approx.  
117  
B
(47)  
a
b
c
d
At start of operation  
a. Area: Automatic capacity control  
b. When Point A has been exceeded, the operation frequency is  
reduced by a certain proportion.  
c. Area: Frequency increase is prohibited.  
LL  
Stopped  
77  
86  
Approx. 104  
(40)  
(25) (30)  
d. At Point B and below, overload prevention is ended and  
control is the same as in the  
a
area.  
Indoor heat exchanger  
temperature °F(°C)  
NOTE  
• The fan speed is forcibly changed to "LL" beginning 30 seconds  
after the thermostat turns OFF.  
Freeze prevention  
• At stability of operation refers to operation when the room  
temperature has approached the set temperature.  
• When HEAT operation starts, the indoor fan is stopped until the  
temperature of the indoor heat exchanger reaches 68°F(20°C)  
or higher, or until the room temperature reaches 59°F(15°C) or  
higher.  
During COOL or DRY operation, freezing is detected and  
operation is stopped when the temperature of the indoor heat  
exchanger matches the conditions below.  
1. Freeze-prevention operation is engaged when the  
temperature of the indoor heat exchanger is below 43°F(6°C).  
2. Restart after freeze-prevention operation occurs when the  
temperature of the indoor heat exchanger reaches 46°F(8°C)  
or above.  
Compressor discharge temperature control  
C
46  
(8)  
This function controls the operation frequency to prevent the  
compressor discharge temperature from rising more than a  
specified temperature.  
A
B
43  
(6)  
Compressor discharge temperature °F(°C)  
36  
(2)  
Approx.  
A
*
214  
(101)  
a
b
c
d
Approx.  
B
a. Area: Automatic capacity control  
b. When the temperature drops below Point A, the operation  
frequency is reduced by a certain proportion.  
201  
(94)  
a
b
c
d
c. Area: Frequency increase is prohibited.  
d. When the temperature reaches Point C or above, freezing  
a. Area: Automatic capacity control.  
b. When the temperature rises above Point A, the operation  
frequency is reduced at a specified rate.  
c. Area: Further frequency increase is prohibited.  
d. When the temperature falls below Point B, prevention of a rise  
in frequency is released and the air conditioner operates as in  
prevention is ended and control is the same as in the  
a
area.  
* When the temperature drops to below 36°F(2°C)  
(continuously for 2 minutes or longer), the compressor stops.  
Once the freeze condition is detected, the air conditioner will  
work less than the maximum frequency until it is turned off.  
a
area.  
* The compressor will stop if the temperature of the compressor  
discharge exceeds 248°F(120°C) due to shortage of gas or  
other reason.  
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Defrost detection and release  
CT (Peak current cut-off control)  
• This function prevents the circuit breaker or fuse from operating  
to open the circuit. This function works when electrical current  
has increased due to an increase in the cooling / heating load,  
or to a decrease in the power supply voltage. In these cases,  
operation frequency is reduced or operation is interrupted auto-  
matically to control the electrical current for operation.  
Reverse-Cycle Defrosting  
Defrosting Sequence  
• When the cause of the increase in electrical current is rectified,  
the system will resume operation in the original mode.  
Heating operation  
<CS-KE12NB41>  
(A)  
Heating  
Outdoor fan ON  
4-way valve ON  
Cooling Dry  
22.5  
Peak current cut-off trips  
Hz down  
14.0  
15.0  
<CS-KE18NB4UW>  
(A)  
Frost sensing  
Cooling Dry  
Heating  
Defrost detection occurs in either of the following cases:  
Peak current cut-off trips  
Hz down  
17.5  
The temperature of the heat exchanger remains at  
or below the L1 line for 3 minutes after the start of  
HEAT operation.  
11.0  
14.0  
• The temperature of the heat exchanger remains at  
or below the L2 line for 120 minutes after the start  
of HEAT operation.  
Electrical current setting for COOL operation is  
used during DEFROST operation.  
NOTE  
Outdoor heat  
exchanger temp.  
0
Ambient temp.  
L2  
L1  
Frosting area  
Reverse-cycle defrosting operation  
Compressor 1 minute after it is stopped,  
compressor is ON.  
Outdoor fan OFF  
Indoor fan OFF  
4-way valve OFF  
Operation lamp  
Repeatedly switches between red  
and orange illumination.  
Releasing of defrosting  
Outdoor heating exchanger temp. is over 68°F(20°C).  
Defrosting operation lasts 12 minutes (maximum).  
2 minutes after it is stopped, compressor is ON.  
4-way valve is ON. Outdoor fan is ON.  
NOTE  
If the air conditioner is turned off during the defrosting  
cycle, it will continue defrosting and turn itself off after  
defrosting is completed.  
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9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)  
9-1. Precautions before Performing Inspection or Repair  
After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.  
High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge  
(charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be  
careful not to touch any electrified parts before the controller LED (red) turns OFF.  
If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at  
least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.  
9-2. Method of Self-Diagnostics  
< Clock display >  
Follow the procedure below to perform detailed trouble diagnostics.  
Test run mode  
Self-diagnostics mode  
NOTE  
1:If the operation lamp blinks every 0.5 seconds immediately when the  
power is turned ON, there is an external ROM (OTP data) failure on the  
indoor circuit board, or a ROM socket insertion problem, or the ROM  
has not been installed.  
2:The failure mode is stored in memory even when the power is not ON.  
Follow the procedure below to perform diagnostics.  
PROCEDURE  
ON/OFF  
operation  
button  
After turning on power to the air conditioner, use the remote controller and  
follow the steps below to execute self-diagnostics.  
Step 1: Press and hold the remote controller HIGH POWER button and 1  
HR TIMER button. Then, press and hold the ACL (reset) button  
with a pointed object such as the tip of a pen. After 5 seconds,  
release ACL button first, then release HIGH POWER and 1 HR  
TIMER buttons, "oP-1" (test run) appears, blinking in the remote  
controller clock display area.  
HIGH POWER  
button  
1HR.  
TIMER  
button  
Step 2: Next, press the 1 HR TIMER button once to change the display  
from "oP-1" to "oP-3" (self-diagnostics). (The display continues to  
blink.)  
Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.  
• The self-diagnostics function utilizes the 3 indicator lamps on the main  
unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to  
report the existence of sensor trouble or a protective operation. (The  
lamps blink or remain ON for 5 seconds, then turn OFF for 2 seconds.)  
Self-diagnostics is completed when the buzzer sounds 3 short beeps.  
• A maximum of 3 self-diagnostics reports are displayed, for 5 seconds  
each, beginning with the most recent report. Following this display the  
lamps turn OFF. In order to view the self-diagnostics results again, press  
the ON/OFF button again.  
ACL  
(Reset)  
button  
• The 3 lamps remain OFF if no trouble has occurred.  
<IMPORTANT> After self-diagnostics is completed, be sure to press the  
ACL (reset) button to return to normal mode. The air  
conditioner will not operate if this is not done.  
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(1) Self-diagnostics Lamps  
INDOOR UNIT  
OPERATION button  
OPERATION lamp  
TIMER lamp  
HIGH POWER lamp  
REMOTE CONTROL receiver  
Since the indications cover various units, the corresponding parts listed below may not be present in some models.  
.... .... ....  
INDICATION ON INDOOR UNIT  
OFF  
BLINKING  
ON  
HIGH  
OPERATION  
TIMER  
POWER  
CODE  
S01  
DIAGNOSIS CONTENTS  
POSSIBLE MALFUNCTION  
(1) OPEN OR SHORT CIRCUIT IN SENSOR  
(2) POOR CONTACT AT CONNECTOR OR OPEN  
CIRCUIT AT TERMINAL PRESS-FIT LOCATION.  
(3) I/D PCB FAILURE (I/D = INDOOR)  
ROOM TEMP. SENSOR TROUBLE  
I/D HEAT EXCHANGER TEMP.  
SENSOR TROUBLE  
S02  
(1) OPEN OR SHORT CIRCUIT IN SENSOR  
(2) POOR CONTACT AT CONNECTOR OR OPEN  
CIRCUIT AT TERMINAL PRESS-FIT LOCATION  
(3) O/D PCB FAILURE (O/D = OUTDOOR)  
COMPRESSOR TEMP. SENSOR  
TROUBLE  
S04  
S05  
O/D HEAT EXCHANGER TEMP.  
SENSOR TROUBLE  
O/D AIR TEMP. SENSOR TROUBLE  
O/D CURRENT SENSOR ERROR  
S06  
S07  
O/D PCB FAILURE  
(1) MIS-WIRING (2) AC POWER FAILURE (3) BLOWN FUSE  
(4) POWER RELAY FAILURE (5) I/D OR O/D PCB FAILURE  
(6) O/D FAN MOTOR FAILURE (7) REACTOR FAILURE  
I/D-O/D COMMUNICATION  
TROUBLE  
E01  
E02  
(SERIAL COMMUNICATION  
TROUBLE)  
(8) HIGH-PRESSURE SW FAILURE (9) OLR FAILURE (10) MAGNETIC COIL FAILURE  
(1) HIC OR POWER TR FAILURE (2) O/D FAN NOT OPERATING  
(3) INSTANTANEOUS POWER STOPPAGE (4) SERVICE VALVE NOT OPENED  
(5) O/D FAN BLOCKED (6) CONTINUOUS OVERLOAD OPERATION  
(7) COMPRESSOR FAILURE (8) O/D PCB FAILURE  
HIC CIRCUIT TROUBLE  
POWER TR CIRCUIT TROUBLE  
O/D UNIT EXTERNAL ROM  
TROUBLE  
(1) EXTERNAL ROM DATA FAILURE (2) O/D PCB FAILURE  
E03  
E04  
(1) INSTANTANEOUS POWER STOPPAGE (2) HIC OR POWER TR FAILURE  
(3) O/D PCB FAILURE  
CURRENT PEAK CUT  
PAM CIRCUIT TROUBLE  
(1) O/D PCB FAILURE  
(2) O/D POWER VOLTAGE TROUBLE  
E05  
E06  
E07  
E08  
ACTIVE CIRCUIT TROUBLE  
(1) ELECTRIC EXPANSION VALVE FAILURE (2) CHOKED CAPILLARY TUBE  
(3) INSUFFICIENT GAS (4) CONTINUOUS OVERLOAD OPERATION  
(5) O/D FAN NOT OPERATING (6) O/D PCB FAILURE  
COMPRESSOR  
DISCHARGE TEMP.  
OVERHEATING PREVENTION  
(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE  
(3) I/D PCB FAILURE  
I/D FAN OPERATION TROUBLE  
4-WAY VALVE SWITCHING  
TROUBLE  
ZERO-CROSS TROUBLE  
(1) 4-WAY VALVE FAILURE (HEAT PUMP MODEL ONLY)  
(2) O/D PCB FAILURE  
(1) SERVICE VALVE NOT OPENED (2) INSUFFICIENT GAS  
(1) OPEN PHASE (2) O/D PCB FAILURE  
GAS-LOSS PREVENTION  
E09  
E10  
DC COMPRESSOR DRIVE  
CIRCUIT TROUBLE  
(1) FAN MOTOR FAILURE (2) CONNECTOR CONTACT FAILURE  
(3) O/D PCB FAILURE  
E11  
E12  
O/D DC FAN OPERATION TROUBLE  
(1) MIS-WIRING (2) BLOWN FUSE  
(3) POWER RELAY FAILURE (4) O/D PCB FAILURE  
(5) COMPRESSOR FAILURE  
O/D SYSTEM COMM FAILURE,  
OLR OPERATION, O/D POWER  
OPEN PHASE, O/D FREEZING  
(1) I/D FAN SYSTEM TROUBLE (2) INSUFFICIENT GAS  
(3) OPERATION AT LOW TEMPERATURE  
FREEZING-PREVENTION OPERATION  
FLOAT SWICTH (FS) IS ACTIVED.  
E13  
TIMER  
LAMP  
BLINKING (3 SEC. INTERVAL)  
(1) DRAIN PUMP FAILURE (2) FS FAILURE (3) CHOKED DRAIN HOSE  
8512-5261-99100-1  
52  
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(2) If the self-diagnostics function fails to operate  
Check the indoor unit.  
• No indicators illuminate and the  
indoor fan does not rotate.  
• Check the power voltage.  
Blown  
Is the fuse blown?  
Normal  
Replace the circuit  
board or the fuse.  
Replace the controller.  
9-3. Checking the Indoor and Outdoor Units  
(1) Checking the indoor unit  
No.  
Control  
Check items (unit operation)  
The rated voltage must be present between inter-unit wirings 1 and 2.  
1
Use the remote controller to operate the  
unit in "TEST run" mode. To determine  
whether the mode is currently in  
"TEST run" mode, check the 3 indicator  
lamps on the unit. If all 3 are blinking,  
the current mode is "TEST run."  
Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the  
voltage at both ends is measured, approximately 12 to 15V DC must  
be output and the multimeter pointer must bounce once every 8  
seconds.  
Or instead of measuring the voltage, you can insert an LED jig and  
check that the LED flickers once every 8 seconds.  
If there are no problems with the above, then check the outdoor unit.  
For the "Test run" procedure, refer to the Appendix B "Installation Instructions".  
(2) Checking the outdoor unit  
No.  
Control  
Check items (unit operation)  
1
Apply the rated voltage between outdoor  
unit terminals L and N.  
The control panel LED (red) must illuminate.  
2
Short-circuit the outdoor unit COM terminal  
to the T-RUN terminal.  
The compressor, fan motor and 4-way valve must all turn on.  
If there are no problems with the above, then check the indoor unit.  
TEST/T-RUN terminals  
Using the TEST/T-RUN terminals  
T-RUN  
: Test run (compressor and fan motor turn ON).  
TEST/MV : Compresses time to 1/60th (accelerates  
operation by 60 times faster than normal).  
(TEST)/MV T-RUN COM  
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(3) Serial Communication Error Identification Procedure  
If the lamps on the main body show the following conditions after the completion of self-diagnostics,  
a communication error between the indoor unit and outdoor unit might be considered.  
In such a case, identify the breakdown section by using the following procedure.  
NOTE  
Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.  
Lamp Operation  
Timer  
High Power  
: Off  
: Blinking  
: Illuminated  
Condition  
E01  
E12  
< Before the Operation >  
For terminal strip short circuit work or inter-unit wiring removal, turn off the power to  
avoid an electric shock.  
WARNING  
Release the terminal strip short circuit after the completion of self-diagnostics.  
Do not perform the short-circuit work between any other terminals except for  
specified ones on the specified terminal strip. If such work is performed between  
the incorrect terminals, the unit might be broken.  
CAUTION  
< Convenient Tool for Short-Circuit Work ( for example ) >  
Cable  
Alligator Clip  
Alligator Clip  
< Check Items before Troubleshooting Serial Communication Start >  
After confirming that the following errors do not exist, start the "Troubleshooting Serial Communication"  
in "Condition: E01 and E12".  
1. Mis -wiring (inter-unit cable, etc.)  
2. AC power failure  
6. Reactor failure (defective insulation, etc.)  
7. High-Pressure Switch failure  
3. Blown fuse  
8. Overload Relay failure  
4. Power Relay failure  
5. Outdoor Fan Motor failure (defective insulation, etc.)  
9. Magnetic Coil failure (defective insulation, short-circuit, etc.)  
10. Compressor failure (defective insulation, etc.)  
(3-1) Condition: E01  
-
+
Outdoor Unit  
V
1
2
3
3
4
5
6
Outdoor Unit  
Troubleshooting Serial Communication  
1
1
2
3
4
5
6
Power  
1
2
Power  
Indoor Unit  
2
3
V
Indoor Unit  
+
-
Fig. 2  
Fig. 1  
1. Turn OFF the power and wait until the power lamp (LED)  
of the outdoor unit controller is turned OFF.  
2. Disconnect the cable from the terminal 3 on the indoor unit  
Is the voltage of about DC12V  
or more given between the terminals  
2 and 3 on the outdoor unit terminal strip  
(Serial Communication Line) ?  
(Fig. 1)  
No  
terminal strip.  
(Fig. 2)  
3. Turn ON the power.  
Yes  
A
B
( Continued to the next page A. )  
( Continued to the next page B. )  
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( Continued from the previous page A. )  
A
( Continued from the previous page B. )  
B
Is the voltage of about DC22V to  
24V given between the terminals  
2 and 3 on the indoor unit terminal strip  
(Serial Communication Line) ?  
(Fig. 2)  
Yes  
No  
Defect in the indoor unit  
P.C. board  
Defect or connection error  
in the inter-unit cable  
Outdoor Unit  
1. Turn OFF the power and wait until the power lamp (LED)  
of the outdoor unit controller is turned OFF.  
2. Short-circuit between the terminals 2 and 3 on the outdoor  
1
1
2
2
3
3
4
5
6
Power  
unit terminal strip.  
(Fig. 3)  
Indoor Unit  
Fig. 3  
1. Turn ON the power and operate the system using the  
remote controller or the operation button on the indoor unit.  
2. Perform the self-diagnosis five seconds after the operation  
start.  
Condition: E12  
Defect in the outdoor unit  
P.C. board.  
What is the latest self-diagnosis result ?  
Condition: E01  
Outdoor Unit  
Outdoor Unit  
1. Turn off the power and wait until the power lamp (LED)  
of the outdoor unit controller is turned OFF.  
2. Remove the short-circuit between the terminals 2 and 3 on  
the outdoor unit terminal strip.  
1
1
2
3
3
4
5
6
1
2
2
3
4
5
6
Power  
Power  
3. Disconnect the cable from the terminal 3 on the indoor unit  
2
terminal strip.  
(Fig. 4)  
1
3
Indoor Unit  
Fig. 4  
Indoor Unit  
Fig. 5  
Short-circuit between the terminals 2 and 3 on the indoor unit  
terminal board. (Fig. 5)  
1. Turn ON the power and operate the system using the  
remote controller or the operation button on the indoor unit.  
2. Perform the self-diagnosis five seconds after the operation  
start.  
Condition: E12  
Defect or connection error  
in the inter-unit cable  
What is the latest self-diagnosis result ?  
Condition: E01  
Defect in the indoor unit  
P.C. board  
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(3-2) Condition: E12  
Troubleshooting Serial Communication  
Outdoor Unit  
1
1
2
2
3
3
4
5
6
Power  
1. Turn off the power and wait until the power lamp (LED)  
of the outdoor unit controller is turned OFF.  
2. Disconnect the cable from the terminal 3 on the Outdoor  
Indoor Unit  
unit terminal strip.  
(Fig. 6)  
Fig. 6  
1. Turn ON the power and operate the system using the  
remote controller or the operation button on the indoor unit.  
2. Perform the self-diagnosis five seconds after the operation  
start.  
Condition: E01  
Defect in the outdoor unit  
P.C. board  
What is the latest self-diagnosis result ?  
Condition: E12  
Outdoor Unit  
1
1
2
3
3
4
5
6
1. Turn off the power and wait until the power lamp (LED)  
of the outdoor unit controller is turned OFF.  
2. Disconnect the cable from the terminal 3 on the indoor  
Power  
2
unit terminal strip.  
(Fig. 7)  
Indoor Unit  
Fig. 7  
1. Turn ON the power and operate the system using the  
remote controller or the operation button on the indoor unit.  
2. Perform the self-diagnosis five seconds after the operation  
start.  
Condition: E01  
Defect in the inter-unit  
cable  
What is the latest self-diagnosis result ?  
Condition: E12  
Defect in the indoor unit  
P.C. board  
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9-4. Trouble Diagnosis of Fan Motor  
9-4-1. Indoor Fan Motor  
This indoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil  
resistance, and the following procedure should be used to check the motor.  
To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the  
indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.  
(A) Turn OFF the power before connecting or disconnecting the motor connectors.  
(B) When performing voltage measurement at the indoor controller connector for (3) in the table  
below, the DC motor will trip and voltage output will stop approximately 1 minute after operation  
is started. For this reason, to measure the voltage again, turn OFF the unit once using the  
remote controller, and then start the air conditioner again.  
Important:  
[Trouble symptom 1] The fan does not stop when the unit stops. Indoor unit controller trouble.  
[Trouble symptom 2] The fan motor does not rotate when the unit is operating.  
(Diagnostic procedure)  
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor  
unit controller (3 locations).  
Measurement location  
Normal value  
CS-KE12NB41  
DC 130V to 195V  
CS-KE18NB4UW  
DC 280V to 340V  
(1) Vm-Gnd: Between pin 1 and pin 3  
(2) Vcc-Gnd: Between pin 4 and pin 3  
(3) Vs-Gnd: Between pin 5 and pin 3  
DC 15V +/- 10%  
Fluctuation between DC 1.8V to 5.7V  
(Diagnostic results)  
All of the above measured values are normal. Fan motor trouble (Replace the motor.)  
Any one of the above measured values is not normal. Indoor unit controller trouble (Replace the controller .)  
(Reference)  
DC motor connector pin arrangement  
Pin 1: Vm (red)  
Pin 2: Not used  
Pin 3: Gnd (black)  
Pin 4: Vcc (white)  
Pin 5: Vs (yellow)  
Pin 6: PG (blue)  
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit  
operates.  
(There is trouble in the system that provides feedback of motor rotation speed from the  
motor to the indoor unit controller.)  
[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.  
[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.  
(Remedy for symptom 3 to 5)  
It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble.  
Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.  
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9-4-2. Outdoor Fan Motor  
This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil  
resistance, and the following procedure should be used to check the motor.  
Perform the trouble diagnosis by Test Run mode described on Installation Instructions.  
(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) Vs-Gnd: Between pin 1 and pin 4  
(2) Vcc-Gnd: Between pin 5 and pin 4  
(3) Vsp-Gnd: Between pin 7 and pin 4  
DC 110V or more  
DC 14V or more  
After fluctuating 4 times between DC 1.0 to 4.3V  
(1 sec. ON) and DC 0 V (1 sec. OFF), the DC  
motor trips.  
(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: Vs (white)  
Pin 2: Not used  
Pin 3: Not used  
Pin 4: Gnd (black)  
Pin 5: Vcc (red)  
Pin 6: FG (blue)  
Pin 7: Vsp (yellow)  
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the outdoor  
unit operates.  
(There is trouble in the system that provides feedback of motor rotation speed from the  
motor to the outdoor unit controller.)  
[Trouble symptom 4] Fan motor rotation speed does not change during outdoor unit operation.  
[Trouble symptom 5] Fan motor rotation speed varies excessively during outdoor unit operation.  
(Remedy for symptom 3 to 5)  
It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble.  
Therefore, first replace the outdoor unit controller, then (if necessary) replace the DC motor.  
58  
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9-5. Noise Malfunction and Electromagnetic Interference  
An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external  
noise, and is likely to cause electromagnetic interference with nearby wireless devices.  
A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these  
effects may still occur. Please pay attention to the points listed below.  
(1) Noise malfunction  
This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.  
Locations most susceptible to noise  
Trouble  
Correction  
1. Locations near broadcast stations where  
there are strong electromagnetic waves  
Either of the following trouble may occur.  
(The fundamental concept is to make the  
system less susceptible to noise.)  
1. The unit may stop suddenly during  
operation.  
2. Locations near amateur radio (short wave)  
stations  
- Insulate for noise or  
distance from the noise source. -  
2. Indicator lamps may flicker.  
3. Locations near electronic sewing machines  
and arc-welding machines  
1. Use shielded wires.  
2. Move unit away from the noise source.  
(2) Electromagnetic interference  
This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through  
space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.  
Locations most susceptible to noise  
Trouble  
Correction  
1. A television or radio is located near the  
A/C and A/C wiring.  
1. Noise appears in the television picture, 1. Select a separate power source.  
or the picture is distorted.  
2. Keep the A/C and A/C wiring at least 1 meter  
2. The antenna cable for a television or  
radio is located close to the A/C and A/C  
wiring.  
2. Static occurs in the radio sound.  
away from wireless devices and antenna cables.  
3. Change the wireless device's antenna to a  
high-sensitivity antenna.  
3. Locations where television and radio  
signals are weak.  
4. Change the antenna cable to a BS coaxial cable.  
5. Use a noise filter (for the wireless device).  
6. Use a signal booster.  
59  
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10. CHECKING ELECTRICAL COMPONENTS  
Ground wire  
10-1. Measurement of Insulation  
Resistance  
Clip  
The insulation is in good condition if the resistance  
exceeds 1M ohm.  
Probe  
10-1-1. Power Supply Cord  
Insulation  
tester  
Clamp the grounding wire of power cord with the lead  
Fig. 1  
clip of the insulation resistance tester and measure the  
resistance by placing a probe on either of the two  
power wires. (Fig. 1)  
Terminal plate  
Then also measure the resistance between the  
grounding and other power terminals. (Fig. 1)  
Probe  
10-1-2. Indoor Unit  
Clamp an aluminum plate fin or copper tube with the  
lead clip of the insulation resistance tester and  
measure the resistance by placing a probe on each  
terminal screw on the terminal plate. (Fig. 2)  
Note that the ground line terminal should be skipped  
for the check.  
Clip  
Copper  
tube or  
Insulation  
tester  
metallic part  
10-1-3. Outdoor Unit  
Fig. 2  
Clamp a metallic part of the unit with the lead clip of  
the insulation resistance tester and measure the  
resistance by placing a probe on each terminal screw  
where power supply lines are connected on the  
terminal plate. (Fig. 2)  
Probe  
10-1-4. Measurement of Insulation  
Resistance for Electrical Parts  
Clip  
Copper  
tube or  
Disconnect the lead wires of the desired electric part  
from terminal plate, capacitor, etc. Similarly disconnect  
the connector. Then measure the insulation resistance.  
(Figs. 3 and 4)  
metallic part  
Insulation  
tester  
Fig. 3  
NOTE  
From fan motor,  
compressor and  
other parts  
Refer to Electric Wiring Diagram.  
If the probe cannot enter the poles because the hole is  
too narrow then use a probe with a thinner pin.  
Probe  
Metallic  
part  
Clip  
Insulation  
tester  
Fig. 4  
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10-2. Checking Continuity of Fuse  
on PCB Ass'y  
Fuse  
Remove the PCB Ass'y from the electrical  
component box. Then pull out the fuse from the PCB  
Ass'y. (Fig. 5)  
Check for continuity using a multimeter as shown in  
Fig. 6.  
PCB Ass'y  
Fig. 5  
Fuse  
Fig. 6  
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11. REFRIGERANT R410A:  
SPECIAL PRECAUTIONS WHEN SERVICING UNIT  
11-1. Characteristics of New Refrigerant R410A  
11-1-1. What is New Refrigerant R410A?  
R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its  
refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.  
11-1-2. Components (mixing proportions)  
HFC32 (50%) / HFC125 (50%)  
11-1-3. Characteristics  
Less toxic, more chemically stable refrigerant  
The composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase. Thus, when  
there is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change in  
composition of the remaining refrigerant. Therefore, do not add new refrigerant. Instead, recover the remaining  
refrigerant with the refrigerant recovery unit. Then, after evacuation, totally recharge the specified amount of  
refrigerant with the new refrigerant at its normal mixed composition state (in liquid phase).  
When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or liquid  
phase, and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is in  
gaseous state. Thus, always charge the refrigerant while it is in liquid phase.  
Ether-type oil is used for compressor oil for R410A-type units, which is different  
CAUTION  
from the mineral oil used for R22.Thus more attention to moisture prevention and  
faster replacement work compared with conventional models are required.  
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11-2. Checklist before Servicing  
Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ  
between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of  
extrusion) by using the flare spacer.  
Specification A  
Diameter of tube D  
Flare tool for R410A  
Conventional flare tool (for R22)  
Dia.1/4" (6.35 mm)  
Dia.3/8" (9.52 mm)  
Dia.1/2" (12.7 mm)  
Dia.5/8" (15.88 mm)  
0 to 0.0196"  
0.0472"  
(0 to 0.5 mm)  
(1.2 mm)  
Size of flare  
Spacer  
D
D
A
A
Flare tool for R410A  
Conventional flare tool (R22)  
Tubing precautions  
Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily  
cover the ends of the tubing with caps or tape prior to installation.  
Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since  
air conditioners with R410A are subject to higher pressure than those using R22 and R407C.  
No addition of compressor oil for R410A  
No additional charge of compressor oil is permitted.  
No use of refrigerant other than R410A  
Never use a refrigerant other than R410A.  
If refrigerant R410A is exposed to fire  
Through welding, etc., toxic gas may be released when R410A refrigerant is exposed to fire. Therefore, be sure  
to provide ample ventilation during installation work.  
Caution in case of R410A leak  
Check for possible leak points with the special leak detector for R410A. If a leak occurs inside the room,  
immediately provide thorough ventilation.  
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11-3. Tools Specifically for R410A  
For servicing, use the following tools for R410A  
Tool Distinction  
Gauge manifold  
Tool Name  
Charging hose  
Gas leak detector  
Refrigerant cylinder  
Charging cylinder  
Refrigerant recovery unit  
Vacuum pump with anti-reverse flow (*1)  
(Solenoid valve-installed type, which prevents oil from flowing back into the  
unit when the power is off, is recommended.)  
Vacuum pump (*2)...can be used if the following adapter is attached.  
Vacuum pump adapter (reverse-flow prevention adapter) (*3).  
(Solenoid valve-installed adapter attached to a conventional vacuum pump.)  
Electronic scale for charging refrigerant  
Flare tool  
Tools specifically for R410A  
Bender  
Tools which can be com-  
monly used for R22,  
R407C, and R410A  
Torque wrench  
Cutter, reamer  
Welding tool, nitrogen gas cylinder  
The above tools specifically for R410A must not be used for R22 and R407C.  
Doing so will cause malfunction of the unit.  
CAUTION  
For the above vacuum pump (*1, *2) and vacuum pump adapter (*3), those for  
R22-type units can be used for R410A-type. However, they must be used  
exclusively for R410A and never alternately with R22 and R407C.  
To prevent other refrigerants (R22, R407C) from being mistakenly charged to this unit, shape and external  
diameter of the service port screw has been altered.  
<External diameter of service port> R410A : 5/16"  
R22, R407C : 1/4"  
11-4. Tubing Installation Procedures  
When the tubes are connected, always apply HAB oil on the flare portions to improve the sealing of tubing.  
The following is the HAB oil generally used:  
Esso: ZERICE S32  
NOTE  
For details on tubing installation procedures, refer to the installation manuals attached to the indoor  
unit and outdoor unit.  
64  
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11-5. In Case of Compressor Malfunction  
Should the compressor malfunction, be sure to make the switch to a replacement  
compressor as quickly as possible.  
CAUTION  
Use only the tools indicated exclusively for R410A. See "11-3.Tools Specifically  
for R410A."  
11-5-1. Procedure for Replacing Compressor  
(1) Recovering refrigerant  
Any remaining refrigerant inside the unit should not be  
released to the atmosphere, but recovered using the  
refrigerant recovery unit for R410A.  
(1) Recover refrigerant  
OK  
Do not reuse the recovered refrigerant, since it will contain  
impurities.  
(2) Replacing Compressor  
(2) Replace compressor  
OK  
Soon after removing seals of both discharge and suction  
tubes of the new compressor, replace it quickly.  
(3) Checking for sealing  
Use nitrogen gas for the pressurized gas, and never use a  
refrigerant other than R410A. Also do not use oxygen or  
any flammable gas.  
(3) Check for sealing  
OK  
(4) Evacuation  
Use a solenoid valve-installed vacuum pump so that  
even if power is cut off in the middle of evacuation of air  
due to a power interruption, the valve will prevent the  
pump oil from flowing back.  
(4) Evacuation  
OK  
The equipment may be damaged if moisture remains in  
the tubing, thus carry out the evacuation thoroughly.  
When using a vacuum pump with exhaust air volume more  
than 0.883 cu.ft./min. and ultimate vacuum pressure rate  
of 50 micron Hg.  
(5) Recharge  
Standard time for evacuation  
Length of tubing  
Less than 33 ft. (10 m)  
More than 33 ft. (10 m)  
Evacuation time  
More than 10 minutes  
More than 15 minutes  
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Configuration and characteristics of cylinders  
(5) Recharging  
Be sure to charge the specified amount of  
Valve  
refrigerant in liquid state using the service port  
of the wide tube service valve. The proper  
amount is listed on the unit's nameplate.  
When the entire amount cannot be charged all at  
once, charge gradually while operating the unit in  
Cooling Operation.  
Liquid  
Never charge a large amount  
CAUTION  
of liquid refrigerant at once to  
the unit.This may cause  
damage to the compressor.  
Single valve  
Charge liquid refrigerant with  
cylinder in up-side-down position.  
When charging with a refrigerant cylinder, use an  
electronic scale for charging refrigerant. In this  
case, if the volume of refrigerant in the cylinder  
becomes less than 20% of the fully-charged  
amount, the composition of the refrigerant starts  
to change. Thus, do not use the refrigerant if  
the amount in the charging cylinder is less  
than 20%.  
Fig. 1  
Valve  
Also, charge the minimum necessary amount to  
the charging cylinder before using it to charge  
the air conditioning unit.  
Example:  
Liquid  
In case of charging refrigerant to a unit requiring  
1.68 lb. (0.76 Kg) using a capacity of a 22 lb. (10  
Kg) cylinder, the minimum necessary amount for  
the cylinder is:  
Single valve (with siphon tube)  
Charge with cylinder in normal position.  
1.68 + 22 0.20 = 6.08 lb.  
(0.76 + 10 0.20 = 2.76 Kg)  
Fig. 2  
For the remaining refrigerant, refer to the  
instructions of the refrigerant manufacturer.  
NO!  
If using a charging cylinder, transfer the specified  
amount of liquid refrigerant from the refrigerant  
cylinder to the charging cylinder.  
Charging  
cylinder  
Prepare an evacuated charging cylinder  
beforehand.  
To prevent the composition  
CAUTION  
of R410A from changing,  
never bleed the refrigerant  
gas into the atmosphere  
while transferring the  
refrigerant. (Fig. 3)  
Liquid  
Open  
Refrigerant  
cylinder  
Do not use the refrigerant if the amount in the  
charging cylinder is less than 20%.  
Fig. 3  
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11-6. In Case Refrigerant is Leaking  
Never attempt to charge additional refrigerant when refrigerant has been leaking  
from the unit. Follow the procedure described below to locate points of leaks and  
carry out repairs, then recharge the refrigerant.  
CAUTION  
(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 residual  
OK  
refrigerant using the refrigerant recovery unit for R410A,  
instead.  
(2) Recover refrigerant  
OK  
Do not reuse the recovered refrigerant because its  
composition will have been altered.  
(3) Welding leaking points  
Confirm again that no residual refrigerant exists in the unit  
before starting welding.  
(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  
Use nitrogen gas for the pressurized gas, and never use a  
refrigerant other than R410A. Also do not use oxygen or  
any flammable gas.  
OK  
OK  
(5) Evacuation  
(5) Evacuation  
(6) Recharge  
Use a solenoid valve-installed vacuum pump so that  
even if power is cut off in the middle of evacuation of air  
due to a power interruption, the valve will prevent the  
pump oil from flowing back.  
The equipment may be damaged if moisture remains in  
the tubing, thus carry out the evacuation thoroughly.  
When using a vacuum pump with exhaust air volume  
more than 0.883 cu.ft./min. and ultimate vacuum pressure  
rate of 50 micron Hg.  
Standard time for evacuation  
Length of tubing  
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."  
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11-7. Charging Additional Refrigerant  
11-7-1. When Tubes are Extended  
Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came  
with the indoor unit. Charge additional refrigerant in liquid state only.  
Never charge additional refrigerant if refrigerant is leaking from the unit. Follow  
CAUTION  
instructions given in "11-6. In Case Refrigerant is Leaking" and completely carry  
out repairs. Only then should you recharge the refrigerant.  
11-8. Retro-Fitting Existing Systems  
11-8-1. Use of Existing Units  
Never use new refrigerant R410A for existing units which use R22. This will cause the air conditioner to  
operate improperly and may result in a hazardous condition.  
11-8-2. Use of Existing Tubing  
If replacing an older unit that used refrigerant R22 with a R410A unit, do not use its existing tubing. Instead,  
completely new tubing must be used.  
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