Panasonic CU-2E18NBU service manual Heating Operation, Powerful Operation

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11.2 Heating Operation

11.2.1Outdoor fan control

šWhen heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below:

šTo improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped capability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will send signal to all thermo-off indoor units to ON fan motor and get room temperature sample.

šTo prevent discharge temperature drop at indoor units which is ON when sampling the room temperature of heating thermo-off units, the outdoor fan speed will be adjusted accordingly.

šHowever, if indoor room temperature is high compare to remote control setting temperature, sampling of corresponding indoor unit will be cancelled.

11.2.2Powerful Operation 1

šDuring cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by temporary stop the capability supply to low load demand indoor units.

šOperation start condition:

o Powerful operation ON for targeted indoor unit

šOperation content:

o If other indoor units (where Powerful operation are OFF) achieve setting temperature continuously for

1 minute after received powerful command from indoor unit, then capability supply to other indoor units are stopped for minimum 3 minutes.

Capability supply stop period follows powerful operation period.

šOperation stops when comply either one of the following conditions:

o When other indoor units (where Powerful operation are OFF) is lower than setting temperature. o When the powerful operation is OFF for all indoor units.

o When Quiet operation received from 1 indoor unit. o When protection control starts.

11.2.3Powerful Operation 2

šDuring cooling / heating operation, this control is to provide fast cooling / heating operation compare to normal operation.

šOperation start if all condition below are complied: o Powerful operation ON for indoor unit.

o Not under Annual Cooling control.

šOperation content:

o Outdoor fan speed will adjust automatically.

o Compressor frequency will adjust automatically.

šOperation stop when comply either one of the follow conditions: o When the powerful operation is OFF for all indoor units.

o When annual cooling control activated.

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Contents CU-2E18NBU Disassembly and Assembly Instructions Safety Precautions Page CU-2E18NBU Specificationsš Multi split combination possibility Volume Dimensions Refrigeration Cycle Diagram Block Diagram Wiring Connection Diagram Electronic Circuit Diagram Main Printed Circuit Board Printed Circuit BoardPage Check Points Installation InformationInstallation Instruction Select The Best LocationOutdoor Unit Connect the Piping Install The Outdoor UnitCutting and Flaring the Piping Evacuation of the EquipmentHeat Insulation Connect The Cable To The Outdoor UnitCooling Operation Operation ControlOutdoor fan control Annual Cooling controlHeating Operation Powerful OperationSimultaneous Operation Control Operation mode priority controlElectronic Parts Temperature Rise Protection 2 Cool Electronic Parts Temperature Rise Protection 1 CoolProtection Control Freeze Prevention control CoolHeating overload control Heat Cooling overload control CoolIPM power transistor Protection Control Time Delay Safety Control Restart ControlDeice Control 13.10 30 seconds Force OperationCompressor Protection Control Gas leak detection control Valve close detection controlCompressor discharge high pressure protection control 14.1 CU-2E18NBU Servicing ModePump down operation SW1 Test Run operationPower Save Mode Wiring Error checkMode priority function Cooling only functionSelf Diagnosis Function Troubleshooting GuidePage Page Outdoor Unit Removal Procedure Disassembly and Assembly InstructionsRemoving the Cabinet Top Plate and Cabinet Front Plate Remove the Control Board Cover and Particular PlatesRemoving the Propeller Fan and Fan Motor Removing the Control P.C. BoardPage 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.