Panasonic CS-KE12NB41, CU-KE12NK1 Charging Additional Refrigerant, Retro-Fitting Existing Systems

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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.

CAUTION

Never charge additional refrigerant if refrigerant is leaking from the unit. Follow instructions given in "11-6. In Case Refrigerant is Leaking" and completely carry 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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Contents Outdoor Model No. Product Code No 852 361Safety Precautions Prohibit Table of Contents CS-KE12NB41 & CZ-18BT1U + CU-KE12NK1 CZ-RD515UTemperature Indoor Air Intake Temp Outdoor Air Intake Temp Operating RangeSpecifications Unit SpecificationsIndoor Unit CS-KE12NB41 & CZ-18BT1UDimensions & Weight Indoor Unit Dimensions & Weight Outdoor UnitCU-KE18NKU 230VCU-KE18NKU 208V CZ-KE18NB4UW & CZ-18BT1U Major Component Specifications Indoor UnitIndoor Unit Body CS-KE12NB41 Indoor Unit Panel CZ-18BT1UIndoor Unit Body CS-KE18NB4UW CB-CS-KE18NB4UOutdoor Unit Outdoor Unit CU-KE12NK1Compressor External FinishOutdoor Unit CU-KE18NKU Other Component Specifications Indoor Unit CS-KE12NB41 & CZ-18BT1UIndoor air temp sensor ModelKTEC-35-S98 Outdoor air temp sensorDimensional Data Unit inch mmUnit inch mm 852-0-0010-12700-0 Unit inch mm 852-0-0010-13200-0 Outdoor unit Refrigerant Flow DiagramRefrigerant Flow Diagram Outdoor unit Indoor Unit CS-KE12NB41 & CZ-18BT1U Outdoor Unit CU-KE12NK1 Temperature ChartsPerformance Data High pressure performance chart Indoor Unit CS-KE18NB4UW & CZ-18BT1U Outdoor Unit CU-KE18NKU At wide Pressure CU-KE12NK1 Power Supply 115V Single Phase 60Hz Cooling CapacityCooling Capacity Power Supply 230V Single Phase 60Hz Cooling Capacity CS-KE18NB4UW & CZ-18BT1UCooling Capacity Low Ambient 740 11,860 800 24.4 TH Total Heating Capacity BTU/h Power Supply 115V Single Phase 60Hz Heating CapacityHeating Capacity Power Supply 230V Single Phase 60Hz Heating Capacity Electrical Characteristics Electrical DataCooling HeatingVoltage230V Cooling Voltage208V Cooling8FA2-5250-46900-2 CS-KE12NB4118BT1U Outdoor Unit CU-KE12NK1 8FA2-5251-12200-2 Controller Maintenance Address Setting of the Remote ControllerHow to Disconnect How to ConnectRemove the air intake grill Disassembly ProcedureDisconnect the connectors in the control box Remove the ceiling panel Remove the indoor air temperature sensor Remove the power box and control boxScrew Ground cable CN07 CN03 CN09 CN06 Remove the main body lower section Remove the drain pump and float switch Remove the heat exchanger sensorRemove the turbo fan and fan motor Remove the heat exchangerFunctions Operation FunctionsEmergency operation Auto cooling/heating operationTimer backup Lamp colorsCompressor discharge temperature control Protective FunctionsOverload prevention during heating Freeze preventionReverse-Cycle Defrosting Defrost detection and releaseCT Peak current cut-off control Method of Self-Diagnostics Troubleshooting Before Calling for ServicePrecautions before Performing Inspection or Repair Self-diagnostics Lamps Indoor UnitUsing the TEST/T-RUN terminals Checking the Indoor and Outdoor UnitsReplace the controller Replace the circuit board or the fuseSerial Communication Error Identification Procedure Off Blinking IlluminatedBefore the Operation Condition E01From the previous page a Condition E12 Trouble Diagnosis of Fan Motor Indoor Fan MotorOutdoor Fan Motor Noise Malfunction and Electromagnetic Interference Noise malfunctionElectromagnetic interference Locations most susceptible to noise Trouble CorrectionPower Supply Cord Checking Electrical ComponentsMeasurement of Insulation Resistance Measurement of Insulation Resistance for Electrical PartsChecking Continuity of Fuse on PCB Assy Refrigerant R410A Special Precautions When Servicing Unit Characteristics of New Refrigerant R410AWhat is New Refrigerant R410A? CharacteristicsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionConfiguration and characteristics of cylinders Amount in the charging cylinder is less than 20%Example To prevent the compositionRecharging Case Refrigerant is LeakingWelding leaking points When Tubes are Extended Charging Additional RefrigerantRetro-Fitting Existing Systems Use of Existing Units
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CZ-18BT1U, CS-KE12NB41, CS-KE18NB4UW, CU-KE18NKU, CU-KE12NK1 specifications

The Panasonic CS-KE18NB4UW and CU-KE12NK1, along with the CS-KE12NB41, CZ-18BT1U, and CU-KE18NKU, represent a suite of advanced air conditioning solutions built with cutting-edge technologies designed to provide optimal comfort, energy efficiency, and air quality in various settings.

One of the standout features of this lineup is the inverter technology. Inverter air conditioners adjust the compressor speed to maintain the desired temperature efficiently. This leads to significant energy savings compared to traditional air conditioners, which tend to frequently cycle on and off, consuming more power. By continuously regulating the temperature, the Panasonic units not only save electricity but also prolong the lifespan of the compressor.

Another noteworthy characteristic is the nanoe™ technology integrated into some of these models. Nanoe™ technology uses hydroxyl radicals to purify the air, minimizing harmful bacteria and allergens. This makes the Panasonic units particularly suitable for users with allergies or respiratory issues, providing a cleaner and healthier indoor environment.

In terms of design, these models are sleek and compact, allowing them to fit seamlessly into any room decor, whether in a home, office, or commercial space. The quiet operation is another advantage, making them ideal for bedrooms and study areas where minimal noise is essential.

Furthermore, the CS-KE18NB4UW and CU-KE12NK1 offer a range of powerful cooling and heating capacities, making them versatile solutions for various climate conditions. The cold climate performance ensures consistent heating in colder regions, while the robust cooling capabilities make them perfect for hot summer months.

The user-friendly features include a smart remote control system, allowing users to adjust settings with ease from a distance. Some models are equipped with Wi-Fi capability, enabling integration with smart home systems for enhanced control and programmability.

In conclusion, the Panasonic CS-KE18NB4UW, CU-KE12NK1, CS-KE12NB41, CZ-18BT1U, and CU-KE18NKU air conditioning units exemplify innovation and efficiency. With their inverter technology, air purification features, compact designs, and smart functionalities, they stand out as ideal choices for maintaining comfortable and healthy indoor environments throughout the year.