Panasonic Cs Kexxnb4x Cz 18bt1u Service Manual

							TECHNICAL & SERVICE MANUAL
CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1
CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Unit
Outdoor Model No. Product Code No.
1 852 361 17
1 852 361 20
Outdoor Unit
CS-KE12NB41 (Body) & CZ-18BT1U (Panel)
CS-KE18NB4UW (Body) & CZ-18BT1U (Panel)
Remote Controller
Wired Remote Controller
(Option)
CU-KE12NK1
CU-KE18NKU
REFERENCE NO. SM700880
Indoor Model No.
Body (Panel)Product Code No.
Body (Panel)
1 852 361 05 (1 852 361 15)
1 852 361 07 (1 852 361 15)
Body
Panel
CS-KE12NB41 (CZ-18BT1U)
CS-KE18NB4UW (CZ-18BT1U)
CU-KE12NK1
CU-KE18NKU 
						

							•  Before doing repair work, please read the "     SAFETY PRECAUTIONS" carefully and fully understand them. 
•  The precautionary items here are divided into "     Warning" and "     Caution" items. 
Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, 
are included in the "     Warning" table.
However, even precautionary items identified as "     Caution" also have the potential for serious consequences
if not performed correctly.
Important safety precautions are described for all items in both categories. Be sure to carefully follow all of them.
• Symbol Indication
:  This symbol indicates items to which we need to pay attention.
In this triangle, a definite precautionary item is described.
:  This symbol indicates the item to be prohibited.
In or close to this circle, a prohibited item is described.
:  This symbol indicates the items requiring special attention or instruction.
In or close to this circle, a prohibited item is described.
•  After doing repair work, perform a test run to confirm that there are no abnormalities.
At the same time, explain the precautions in use to the user.
SAFETY PRECAUTIONS
Warning
Before performing an overhaul, disconnect the power plug or power cable from the unit.
Performing the work with the power supplied to the unit, may cause an electric shock.
When repair work or circuit inspection that requires power supply for the air conditioner, is to be performed, 
do not touch the charging section. 
Doing so may cause an electric shock.
For the step-up capacitor attached to the electric section, perform the repair work after sufficiently discharging it.
Insufficient capacitor discharge may cause an electric shock.
Do not perform repair work on the electric sections with wet hands. 
Doing so may cause an electric shock.
Do not start or stop the air conditioner by means of connecting or disconnecting the power plug. 
Doing so may cause an electric shock or fire.
When conducting repair work only use components included in the parts list for the corresponding unit and perform 
the work with the appropriate tools.
Incorrect or poor repair work may cause an electric shock or fire.
Never modify the unit. 
Doing so may cause an electric shock or fire.
Perform all electric work according to local applicable regulations related to electrical equipment or interior wiring 
regulation and make sure to use the exclusive circuit.
Insufficient capacity to the electric circuit or defective arrangement results may cause an electric shock or fire.
Make sure to replace any power cable or lead wire showing any signs of scratch or deterioration. 
Failure to do so may cause an electric shock, overheating or fire.
Make sure that there is no dust on or slack in the power plug and insert fully into the socket. 
Dust or incomplete connections may cause an electric shock or fire.
Do not damage or process the power cord, as it may cause an electric shock or fire.                                  
For the wiring between the indoor unit and outdoor unit, securely fix the specified cable onto the terminal plate.
Poorly fixed wiring may cause a heat or fire.
After connecting the wiring between the indoor unit and outdoor unit, attach the terminal cover securely. 
Incomplete attachment of the terminal cover may cause overheating or fire.
Prohibit
Prohibit
Prohibit
Prohibit
Prohibit
2 
						

							Warning
If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite.
If refrigerant gas leaks during the work, ventilate the room.
If refrigerant gas catches fire, harmful gas may be generated.
Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle. 
If air or other contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle, 
which may cause a unit breakdown."
When the welded section of the compressor intake or discharge pipe is to be disconnected, perform it in 
a well-ventilated place after sufficiently recovering the refrigerant gas.
Any residue gas may jet out refrigerant or refrigerating machine oil, which may cause an injury.
When the work is to be performed in a high place (About 2 meters or more), make sure to wear a safety helmet, 
gloves and safety belt. Insufficient safety gear may cause a serious injury in case of a fall.
When the unit is to be relocated, confirm that the new installation location has sufficient strength for the weight of the unit.
Insufficient strength of the installation location and incomplete installation work may cause an injury due to 
the unit falling.
When the remote controller batteries are replaced, dispose of the old batteries out of the reach of children. 
If a child swallows a battery, make sure that the child gets immediate medical attention.
Caution
Do not wash the air conditioner with water, as this may cause an electric shock or fire.
For the repair work in places with high humidity or moisture, make sure to ground the unit. 
Failure to do so may cause an electric shock.
Confirm that the component attachment position, wiring condition, soldering condition and connector connection 
are normal. 
If not, it may cause overheating or fire.
Confirm that the temperature around the compressor is not too high, and then perform the repair work. 
Failure to do so may cause a burn.
Perform welding work in a place with good ventilation. 
If the work is performed in a poorly ventilated area, it might cause a lack of oxygen.
If the installation plate or attachment frame has deteriorated due to corrosion, etc., replace it.
Failure to do so may cause an injury due to the unit falling.
When the cleaning is to be performed, make sure to turn off the power and pull out the plug. 
Touching the fan that is rotating at high speed may result in an injury. 
When the indoor unit is to be removed, do not place it on an incline. 
Doing so may cause wet furniture because water left inside may trickle down.
Do not hold the sharp end of the unit or the aluminum fins, as it may cause an injury to your hand or finger.
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. 
Prohibit
Prohibit
Prohibit
Prohibit
Prohibit
3 
						

							Table of Contents
    SAFETY PRECAUTIONS
TABLE OF CONTENTS
1.   OPERATING RANGE
2.   SPECIFICATIONS
2-1. Unit Specifications 
2-2.  Major Component Specifications 
2-3.  Other Component Specifications 
3.   DIMENSIONAL DATA
4.   REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
5.   PERFORMANCE DATA
5-1. Temperature Charts
5-2. Cooling Capacity
5-3.  Cooling Capacity (Low Ambient)
5-4. Heating Capacity
6.   ELECTRICAL DATA
6-1.   Electrical Characteristics
6-2.   Electric Wiring Diagrams
7.   MAINTENANCE
7-1.  Address Setting of the Remote Control Unit
7-2.  Disconnecting and Connecting Positive Connector for Outdoor Unit
7-3. Disassembly Procedure
8.   FUNCTIONS
8-1. Operation Functions
8-2. Protective Functions
9.  TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
9-1.  Precautions before Performing Inspection or Repair
9-2.  Method of Self-Diagnostics
9-3.  Checking the Indoor and Outdoor Units
9-4.  Trouble Diagnosis of Fan Motor
9-5.  Noise Malfunction and Electromagnetic Interference2
4
6
7
13
17
18
21
23
27
29
31
33
35
38
39
40
47
49
51
51
53
57
59 ..............................................................................................................
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4 
						

							10. CHECKING ELECTRICAL COMPONENTS
10-1.  Measurement of Insulation Resistance
10-2.  Checking Continuity of Fuse on PCB Ass'y
11. REFRIGERANT R410A: 
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1.  Characteristics of New Refrigerant R410A
11-2.  Checklist before Servicing
11-3.  Tools Specifically for R410A
11-4.  Tubing Installation Procedures
11-5.  In Case of Compressor Malfunction
11-6.  In Case Refrigerant is Leaking
11-7.  Charging Additional Refrigerant
11-8.  Retro-Fitting Existing Systems
 APPENDIX A  Operating Instructions
  (CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1   CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)
 APPENDIX B  INSTALLATION INSTRUCTIONS
  (CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1   CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU)
 APPENDIX C  Operating Instructions
 (CZ-RD515U)
 APPENDIX D  INSTALLATION INSTRUCTIONS
 (CZ-RD515U)
60
61
62
63
64
64
65
67
68
68
A-1
A-2
A-3
A-4 ...............................................................................
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5 
						

							95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
80 °F DB / 67 °F WB
– DB / – WB
1.  OPERATING RANGE
Maximum
Minimum
Maximum
Minimum115 °F DB
0 °F DB
75 °F DB / 65 °F WB
– DB / 0 °F WB Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.
Cooling
Heating
6 
						

							2.  SPECIFICATIONS
2-1.  Unit Specifications
Indoor UnitCS-KE12NB41 & CZ-18BT1U
Outdoor UnitCU-KE12NK12-1-1.
Vertical
dB-A
dB-A Indoor : Hi/Me/Lo
Outdoor : Hi Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Refrigerant Control12.6
1,260( 2.5 to 12.6 )
( 250 to 1,260 ) 11,900
3.5( 3,000 to 11,900 )
( 0.9 to 3.5 )Cooling
7,200
4,700
115V Single-Phase 60Hz
104 to 126
Refrigerant Tubing  Connections Operation Sound
Electrical Rating
Sensible Capacity
Latent Capacity
W Power InputV
A Available Voltage  Range
Running Amperes
Narrow tube
Wide tube Refrigerant inch (mm)
Tube Diameter inch (mm)1/4 (6.35)
3/8 (9.52) ft (m) Max. allowable tubing length at shipmentFlare Type
25 (7.5) 34 / 32 / 31
4735 / 34 / 32
49 R410A / 2.43 (1,100)
Electric Expansion ValveWashable, Anti-Mold
DC Rotary (Inverter)-
Auto Timer
Indoor / Outdoor Fan Speeds 
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Airflow Direction (Indoor) Horizontal Controls / Temperature Control
Control UnitMicroprocessor / I.C. Thermister
Wireless Remote Control Unit
Features
Compressor Locked Rotor AmperesBTU/h
Performance
% Power Factor 87
A20 Voltage Rating
BTU/hkW Total Capacity
BTU/h
SEER BTU/Wh 16
235(399) / 206(350) / 194(330) Air Circulation  (Hi/Me/Lo) ft3/min (m3/h)
4.2613,600
4.0( 3,000 to 13,600 )
( 0.9 to 4.0 )Heating
-
-
268(455) / 247(420) / 224(381)
- Moisture Removal (High) Pints/h
HSPF BTU/Wh -
COP W/W -
EER BTU/h/W 9.44
Fuse or Circuit Breaker Capacity A 2014.6
1,460( 2.5 to 14.6 )
( 250 to 1,460 )
87
-
8.5 2.74-
Wired Remote Controller (Option) CZ-RD515U
7 
						

							Indoor UnitCS-KE12NB41 & CZ-18BT1U
Outdoor UnitCU-KE12NK1
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 WBHeating: Indoor air temperature 70 °F DB
Outdoor air temperature 47 °F DB / 43 °F WB
Shipping VolumeNet
Shipping Weight Ib. (kg)
Ib. (kg)
cu.ft (m3) inch (mm) Dimensions & Weight (Indoor Unit)
Unit Dimensions Height
Width
Depth
-
-22-5/8 (575)
35.3 (16)Individual Unit
Body
(CS-KE12NB41)
Panel
(CZ-18BT1U) Indoor Unit
(CS-KE12NB41 & CZ-18BT1U)
inch (mm) (313)12-5/16
(625) 24-19/32
(625) 24-19/32
(18.7) 41.311-5/32 (283)
inch (mm) 22-5/8 (575)
inch (mm) Package Dimensions Height
Width
Depth28-1/8 (714) inch (mm) -
-
-11-13/32 (290)
inch (mm) 24-13/16 (630)
41.9 (19)
4.59 (0.13)24-19/32 (625)
6.0 (2.7) 1-9/16 (40)
24-19/32 (625)
26-11/16 (678)4-1/8 (105)
26-3/16 (665)
7.7 (3.5)
1.65 (0.04)
Shipping VolumeNet
Shipping Weight Ib. (kg)
Ib. (kg)
cu.ft (m3) inch (mm) Dimensions & Weight (Outdoor Unit)
Unit Dimensions Height
Width
DepthOutdoor Unit
(CU-KE12NK1)
inch (mm) (548)21-9/16
(720) 28-11/32
(265) 10-7/16
(596) 23-15/32
(866) 34-3/32
(368) 14-1/2
(35.0) 77.2
(38.0) 83.8
(0.18) 6.35
inch (mm)
inch (mm) Package Dimensions Height
Width
Depthinch (mm)
inch (mm)
8 
						

							< 230V > Indoor UnitCS-KE18NB4UW & CZ-18BT1U
Outdoor UnitCU-KE18NKU
2-1-2.
Vertical
dB-A
dB-A Indoor : Hi/Me/Lo
Outdoor : Hi Air Filter
Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Refrigerant Control8.3
1,860( 1.2 to 8.3 )
( 250 to 1,860 ) 17,500
5.15( 4,000 to 17,500 )
( 1.2 to 5.15 )Cooling
10,600
6,900230V Single-Phase 60Hz
187 to 253
Refrigerant Tubing  Connections Operation Sound
Electrical Rating
Sensible Capacity
Latent Capacity
W Power InputV
A Available Voltage  Range
Running Amperes
Narrow tube
Wide tube Refrigerant inch (mm)
Tube Diameter inch (mm)1/4 (6.35)
1/2 (12.7) ft (m) Max. allowable tubing length at shipmentFlare Type
25 (7.5) 44 / 40 / 36
5144 / 40 / 36
52 R410A / 2.87 (1,300)
Electric Expansion ValveWashable, Anti-Mold
DC Twin  Rotary  (Inverter)-
Auto Timer
Indoor / Outdoor Fan Speeds 
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Airflow Direction (Indoor) Horizontal Controls / Temperature Control
Control UnitMicroprocessor / I.C. Thermister
Wireless Remote Control Unit
Features
Compressor Locked Rotor AmperesBTU/h
Performance
% Power Factor 97
A 17.5 Voltage Rating
BTU/hkW Total Capacity
BTU/h
SEER BTU/Wh 16
341(579) / 294(500) / 253(430) Air Circulation  (Hi/Me/Lo) ft3/min (m3/h)
4.8920,400
6.0( 4,400 to 20,400 )
( 1.3 to 6.0 )Heating
-
-
383(651) / 324(551) / 265(450)
- Moisture Removal (High) Pints/h
HSPF BTU/Wh -
COP W/W -
EER BTU/h/W 9.41
Fuse or Circuit Breaker Capacity A 1510.5
2,340( 1.3 to 10.5 )
( 270 to 2,340 )
97
-
8.5 2.56-
Wired Remote Controller (Option) CZ-RD515U
9 
						

							Indoor UnitCS-KE18NB4UW & CZ-18BT1U
Outdoor UnitCU-KE18NKU
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Shipping VolumeNet
Shipping Weight Ib. (kg)
Ib. (kg)
cu.ft (m3) inch (mm) Dimensions & Weight (Indoor Unit)
Unit Dimensions Height
Width
DepthIndividual Unit
Body
(CS-KE18NB4UW)
Panel
(CZ-18BT1U) Indoor Unit(CS-KE18NB4UW & CZ-18BT1U)
inch (mm)
inch (mm)
inch (mm) Package Dimensions Height
Width
Depthinch (mm)
inch (mm)
Shipping VolumeNet
Shipping Weight Ib. (kg)
Ib. (kg)
cu.ft (m3) inch (mm) Dimensions & Weight (Outdoor Unit)
Unit Dimensions Height
Width
DepthOutdoor Unit
(CU-KE18NKU)
inch (mm) (670)26-3/8
(880) 34-21/32
(285) 11-7/32
(733) 28-27/32
(1,012) 39-27/32
(379) 14-29/32
(44.0) 97.0
(48.0) 105.8
(0.28) 9.88
inch (mm)
inch (mm) Package Dimensions Height
Width
Depthinch (mm)
inch (mm)
< 230V >
-
-(313) 12-5/16
(625) 24-19/32
(625) 24-19/32
(18.7) 41.3-
-
-22-5/8 (575)
35.3 (16) 11-5/32 (283)
22-5/8 (575)
28-1/8 (714) 11-13/32 (290)
24-13/16 (630)
41.9 (19)
4.59 (0.13)24-19/32 (625)
6.0 (2.7) 1-9/16 (40)
24-19/32 (625)
26-11/16 (678)4-1/8 (105)
26-3/16 (665)
7.7 (3.5)
1.65 (0.04)
Remarks:Rating conditions are:
Cooling: Indoor air temperature 80 °F DB / 67 °F WB
Outdoor air temperature 95 °F DB / 75 °F WBHeating: Indoor air temperature 70 °F DB
Outdoor air temperature 47 °F DB / 43 °F WB
10