Panasonic CU-2E18NBU service manual Cooling overload control Cool, Heating overload control Heat

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13.5 Cooling overload control (Cool)

šThis control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation.

13.6 Heating overload control (Heat)

šThis control detect indoor pipe temperature and perform the compressor frequency restriction during heating operation.

šThis control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.

13.7 Extreme Low Temperature Compressor low pressure protection control (Heat)

šThis control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to improve the compressor reliability.

šDuring heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated. Compressor frequency restriction will be based on outdoor piping temperature.

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Contents CU-2E18NBU Disassembly and Assembly Instructions Safety Precautions Page Specifications CU-2E18NBUš Multi split combination possibility Volume Dimensions Refrigeration Cycle Diagram Block Diagram Wiring Connection Diagram Electronic Circuit Diagram Printed Circuit Board Main Printed Circuit BoardPage Installation Information Check PointsInstallation Instruction Select The Best LocationOutdoor Unit Install The Outdoor Unit Connect the PipingEvacuation of the Equipment Cutting and Flaring the PipingConnect The Cable To The Outdoor Unit Heat InsulationOperation Control Cooling OperationOutdoor fan control Annual Cooling controlPowerful Operation Heating OperationOperation mode priority control Simultaneous Operation ControlElectronic Parts Temperature Rise Protection 1 Cool Electronic Parts Temperature Rise Protection 2 CoolProtection Control Freeze Prevention control CoolCooling overload control Cool Heating overload control HeatTime Delay Safety Control Restart Control IPM power transistor Protection ControlDeice Control 13.10 30 seconds Force OperationCompressor Protection Control Gas leak detection control Valve close detection controlCompressor discharge high pressure protection control Servicing Mode 14.1 CU-2E18NBUPump down operation SW1 Test Run operationWiring Error check Power Save ModeMode priority function Cooling only functionTroubleshooting Guide Self Diagnosis FunctionPage Page Disassembly and Assembly Instructions Outdoor Unit Removal ProcedureRemoving the Cabinet Top Plate and Cabinet Front Plate Remove the Control Board Cover and Particular PlatesRemoving the Control P.C. Board Removing the Propeller Fan and Fan MotorPage Technical Data Operation CharacteristicsOne Indoor Unit Operation 133.000 128.000 100 105 110 115 Outdoor Air Temperature F š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Heating Characteristic š Heating Characteristic š Piping Length Characteristic Heating š Piping Length Characteristic Heating Two Indoor Unit Operation CapacitykW š Cooling Characteristic š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Heating Characteristic š Heating Characteristic š Heating Characteristic š Piping Length Characteristic Heating š Piping Length Characteristic Heating š Piping Length Characteristic Heating Exploded View and Replacement Parts List REF. no Description & Name ’TY CU-2E18NBU Remark Accessory CO. Drain Elbow

CU-2E18NBU specifications

The Panasonic CU-2E18NBU is a highly efficient outdoor unit designed for residential and commercial applications, providing reliable heating and cooling year-round. This unit is part of Panasonic's extensive range of HVAC solutions, known for their innovation and energy efficiency.

One of the standout features of the CU-2E18NBU is its advanced inverter technology. This technology allows the system to adjust the compressor speed based on the temperature demand, resulting in reduced energy consumption and enhanced comfort. By continuously varying the output, the inverter system maintains a consistent indoor climate without the frequent on/off cycles typical of conventional systems. This not only saves energy but also extends the lifespan of the unit.

The CU-2E18NBU is designed to operate efficiently in a wide range of conditions, showcasing excellent performance in harsh climates. With a capacity of 18,000 BTU, it can efficiently cool or heat spaces effectively, making it suitable for medium-sized rooms or multiple areas when paired with compatible indoor units.

Another significant characteristic of this Panasonic model is its environmentally friendly refrigerant, R32. This refrigerant has a lower impact on global warming and ozone depletion compared to older options, making the CU-2E18NBU a smart choice for eco-conscious consumers. R32 also enhances the system's efficiency, further contributing to lower energy costs.

The unit features a robust construction, allowing it to withstand outdoor conditions while promoting durability. Its compact design allows for flexible installation options, making it easier to fit in various environments without compromising aesthetic appeal.

Moreover, the CU-2E18NBU incorporates advanced air filtration and purification technologies, improving indoor air quality. The filters are designed to capture dust, allergens, and other particulates, ensuring cleaner, healthier air.

In summary, the Panasonic CU-2E18NBU stands out for its efficient inverter technology, environmentally friendly refrigerant, and compact, durable design. With its ability to provide consistent temperature control and improve indoor air quality, this unit is a reliable solution for anyone looking to enhance their heating and cooling systems.