Panasonic CS-KE12NB41, CS-KE18NB4UW, CU-KE12NK1, CU-KE18NKU, CZ-18BT1U 4. REFRIGERANT FLOW DIAGRAM

Compressor

Accumulator

Wide tube

service

valve

Wide tube

Narrow

tube

service

valve

Narrow tube

Heat exchanger

Muffler

Capillary

tube for

split flow

Cooling cycle

(Defrosting cycle)

Heating cycle

Indoor unit Outdoor unit

Electric

expansion

valve

Strainer

M

Muffler

O.D.

3/8"

(9.52 mm)

O.D.

1/4"

(6.35 mm)

4-way

valve

High pressure

switch

H.P.

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1

Contents

Main TECHNICAL & SERVICE MANUAL CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CS-KE18NB4UW & CZ-18BT1U + CU-KE18NKU Indoor Unit DC INVERTER SPLIT SYSTEM AIR CONDITIONER Outdoor Unit SAFETY PRECAUTIONS Warning Caution Table of Contents Page 1. OPERATING RANGE 2. SPECIFICATIONS 2-1. Unit Specifications Indoor Unit CS-KE12NB41 & CZ-18BT1U 2-1-1. Indoor Unit CS-KE12NB41 & CZ-18BT1U Cooling: Indoor air temperature 80 F DB / 67 F WB < 230V > 2-1-2. < 230V > Cooling: Indoor air temperature 80 F DB / 67 F WB Outdoor Unit CU-KE18NKU < 208V > 2-1-3. < 208V > Cooling: Indoor air temperature 80 F DB / 67 F WB Indoor Unit (Body) CS-KE12NB41 Indoor Unit (Panel) CZ-18BT1U 2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit (Body) CS-KE18NB4UW Indoor Unit (Panel) CZ-18BT1U 2-2-2. Outdoor Unit Page 2-3. Other Component Specifications 3. DIMENSIONAL DATA Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U A View 24-19/32 (625) Center of Outdoor Unit CU-KE12NK1 Unit : inch (mm) (852-0-0010-12700-0) ID:23/32 4-ID:15/16 Outdoor Unit CU-KE18NKU Unit : inch (mm) (852-0-0010-13200-0) Compressor Heat exchanger Heat exchanger Indoor unit Outdoor unit 4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Indoor unit Outdoor unit M Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 115V) (1) Low pressure performance chart 5. PERFORMANCE DATA 5-1. Temperature Charts 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 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) (1) Low pressure performance chart 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 5-2. Cooling Capacity < Cooling Capacity > Above data does not take Freeze Prevention Protection during cooling operation into account. Power Supply : 230V Single Phase 60Hz < Cooling Capacity > Above data does not take Freeze Prevention Protection during cooling operation into account. 5-3. Cooling Capacity (Low Ambient) < Cooling Capacity (Low Ambient) > 1. 2. Above data represents the value when the operation frequency of a compressor is fixed. Above data does not take Freeze Prevention Protection during cooling operation into account. Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > 1. 2. Above data represents the value when the operation frequency of a compressor is fixed. Above data does not take Freeze Prevention Protection during cooling operation into account. 5-4. Heating Capacity < Heating Capacity > TH : Total Heating Capacity (BTU/h) Power Supply : 230V Single Phase 60Hz < Heating Capacity > TH : Total Heating Capacity (BTU/h) 6. ELECTRICAL DATA 6-1. Electrical Characteristics Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit Indoor Unit CZ-KE18NB4U & CZ-18BT1U Outdoor Unit 230V < > < (1) Voltage:230V 6-2. Electric Wiring Diagrams Indoor Unit CS-KE12NB41 & CZ-18BT1U CS-KE18NB4UW & CZ-18BT1U 2 3 1 8FA2-5250-46900-2 Page 8FA2-5251-11900-2 Outdoor Unit CU-KE18NKU * CONTROLLER S RT CM 7. MAINTENANCE 7-1. Address Setting of the Remote Controller 7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit 7-3. Disassembly Procedure 7-3-1. Remove the air intake grill. 7-3-2. Disconnect the connectors in the control box. 7-3-3. Remove the ceiling panel. 7-3-4. Remove the indoor air temperature sensor. 7-3-5. Remove the power box and control box. Page 7-3-6. Remove the main body lower section. 7-3-7. Remove the heat exchanger sensor. 7-3-8. Remove the drain pump and float switch. 7-3-9. Remove the turbo fan and fan motor. 7-3-10. Remove the heat exchanger. Emergency operation SENSOR DRY AUTO cooling/heating operation PAM- control 8. FUNCTIONS 8-1. Operation Functions HIGH POWER NIGHT SETBACK Lamp colors Timer backup Overload prevention during heating Cold-air prevention during heating 8-2. Protective Functions CT (Peak current cut-off control) Reverse-Cycle Defrosting Heating operation Frost sensing Releasing of defrosting Reverse-cycle defrosting operation 9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 9-1. Precautions before Performing Inspection or Repair NOTE 9-2. Method of Self-Diagnostics Follow the procedure below to perform detailed trouble diagnostics. (1) Self-diagnostics Lamps INDOOR UNIT 9-3. Checking the Indoor and Outdoor Units (3) Serial Communication Error Identification Procedure Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure. CAUTION < Before the Operation > (3-1) Condition: E01 Page (3-2) Condition: E12 9-4. Trouble Diagnosis of Fan Motor 9-4-1. Indoor Fan Motor 9-4-2. Outdoor Fan Motor 9-5. Noise Malfunction and Electromagnetic Interference (1) Noise malfunction (2) Electromagnetic interference 10. CHECKING ELECTRICAL COMPONENTS 10-1. Measurement of Insulation Resistance 10-1-1. Power Supply Cord 10-1-2. Indoor Unit 10-1-3. Outdoor Unit Page 11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A 11-1-1. What is New Refrigerant R410A? 11-1-2. Components (mixing proportions) 11-1-3. Characteristics 11-2. Checklist before Servicing 11-3. Tools Specifically for R410A 11-4. Tubing Installation Procedures 11-5. In Case of Compressor Malfunction 11-5-1. Procedure for Replacing Compressor NO! 11-6. In Case Refrigerant is Leaking 11-7. Charging Additional Refrigerant 11-8. Retro-Fitting Existing Systems Page Page Split System Air Conditioner Operating Instructions 2 FEATURES CONTENTS PRODUCT INFORMATION SAFETY PRECAUTIONS 3 INSTALLATION LOCATION NOTICE Avoid: ELECTRICAL REQUIREMENTS SAFETY INSTRUCTIONS NAMES OF PARTS REMOTE CONTROL receiver UNIT DISPLAY AND OPERATION BUTTON Air Intake Air Outlet REMOTE CONTROLLER (DISPLAY) Page 7 (A UT O) (HEA T) (DR Y) (COOL) (F AN) 8 USING THE REMOTE CONTROLLER Hole ACL button HOW TO INSTALL BATTERIES 1. OPERATION WITH THE REMOTE CONTROLLER 1. Automatic Operation When the remote controllers S/M switch is at the S (Single) position When the remote controllers S/M switch is at the M (Multiple) position 2. Manual Operation 3. Adjusting the Fan Speed A. Automatic fan speed B. Manual fan speed 4. Fan Only 5. Night Setback Mode SPECIAL REMARKS How it works? Remote Controller Clicking Sound Power failure during operation 2. How to set the OFF time 3. How to set the ON time 4. How to set daily ON/OFF repeat timer 1. 2. USING THE 1-HOUR OFF TIMER 1. 1-Hour OFF Timer 2. Operation together with the daily ON/OFF repeat timer TIPS FOR ENERGY SAVING Avoid OPERATION WITHOUT THE When the air conditioner is not running CARE AND CLEANING Ceiling panel (Indoor Unit) Cleaning the flaps Page 16 TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) OPERATING RANGE The air conditioner is operable within the temperature ranges as listed below: WIRED REMOTE CONTROLLER Temperature Indoor air temperature SPECIFICATIONS For Single use SPECIFICATIONS (CONTINUED) For Multiple use Page Page This air conditioner uses the refrigerant R410A. External diameter of service port R410A: 5/16" Split System Air Conditioner INSTALLATION INSTRUCTIONS Contents IMPORTANT! Please Read Before Starting If Necessary, Get Help In Case of Improper Installation SPECIAL PRECAUTIONS When Wiring When Servicing Others NOTE 1. General 2. Installation Site Selection NO 3. How to Install the Indoor Unit Page Indoor unit NO Page Page Page * Page 4. How to Install the Outdoor Unit 5. Refrigerant Tubing Page 6. Air Purging Page Page Page 7. Remote Controller Installation Position 8. Address Switch Page Page 2 FEATURES CONTENTS PRODUCT INFORMATION SAFETY PRECAUTIONS 3 INSTALLATION LOCATION NOTICE Avoid: ELECTRICAL REQUIREMENTS SAFETY INSTRUCTIONS Page 5 (A UT O) (HEA T) (DR Y) (COOL) (F AN) REMOTE CONTROLLER (DISPLAY) OPERATION WITH THE REMOTE CONTROLLER 1. Automatic Operation (only for COOL/DRY/HEAT Model) 2. Manual Operation STEP 3 STEP 4 STEP 5 SPECIAL REMARKS STEP 3 Power failure during operation 9 SETTING THE TIMER ON TIME 1. How to set the present time 2. How to set the OFF time 3. How to set the ON time USING THE 1-HOUR OFF TIMER 1. 1-Hour OFF Timer 2. Operation together with the daily ON/OFF repeat timer ADJUSTING THE AIRFLOW DIRECTION Page Page Parts supplied with the remote controller Remote controller installation guidelines How to install the remote controller Wired Remote Controller INSTALLATION INSTRUCTIONS Page How to wire the remote controller How to Test Run the Air Conditioner

Panasonic 4. REFRIGERANT FLOW DIAGRAM

Models: CS-KE12NB41 CS-KE18NB4UW CU-KE12NK1 CU-KE18NKU CZ-18BT1U

Compressor

Heat exchanger

Heat exchanger

Indoor unit Outdoor unit

Electric

expansion

valve

Strainer

M

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1