Panasonic CU-2E18NBU service manual Compressor Protection Control Gas leak detection control

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13.13 Compressor Protection Control (Gas leak detection control 1)

šControl start conditions

o For 5 minutes, the compressor continuously operates and total current is low. o During Cooling or Soft Dry operation:

Indoor intake temperature — indoor piping temperature is below 39.2°F. o During Heating operation:

Indoor pipe temperature — indoor intake temperature is below 37.4°F. o Not during deice control.

o Compressor ON with maximum frequency.

šControl content

o Compressor stops (and restart after 3 minutes)

o If the conditions above happen 4 times within 60 minutes, the unit will stop operation (“F91” is indicated).

13.14 Compressor Protection Control (Gas leak detection control 2)

šThis control detect gas leakage condition to prevent compressor damage.

šControl start condition

o All connected indoor units capability supply ON. o Compressor ON with maximum frequency.

o Not during annual cooling.

o Compressor discharge temperature high.

šControl content

o Compressor OFF during this control (“F91” is memorized in EEPROM)

o If the above conditions happen 2 times within 60 minutes, indoor units’ Timer LED will blinks (“F91” is indicated at all indoor units)

13.15 Valve close detection control

šThis control detects 3-way valve close condition to prevent damage to refrigerant cycle.

šStart conditions:

o For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between 28.4°F and 35.6°F continuously for 5 minutes after compressor ON at first cooling operation.

o The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation or after pump down.

šControl content

o During this control, compressor stop, indoor units’ Timer LED will blink. (“F91” is indicated at indoor units)

šError reset can be done by power supply reset or reset by using remote control.

13.16 Compressor discharge high pressure protection control

šThis control protect by using high pressure switch during operation.

šStart conditions

o High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or heating during compressor running.

šControl 1 content

o Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this condition happen 4 times within 30 minutes, “F94” is indicated.

o After 30 minutes, counter is reset if this condition does not happen for 4 times.

šControl 1 stop conditions o Power supply reset

o Reset by using remote control

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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 PointsOutdoor Unit Installation InstructionSelect The Best Location Install The Outdoor Unit Connect the PipingEvacuation of the Equipment Cutting and Flaring the PipingConnect The Cable To The Outdoor Unit Heat InsulationOutdoor fan control Operation ControlCooling Operation Annual Cooling controlPowerful Operation Heating OperationOperation mode priority control Simultaneous Operation ControlProtection Control Electronic Parts Temperature Rise Protection 1 CoolElectronic Parts Temperature Rise Protection 2 Cool Freeze Prevention control CoolCooling overload control Cool Heating overload control HeatDeice Control Time Delay Safety Control Restart ControlIPM power transistor Protection Control 13.10 30 seconds Force OperationCompressor discharge high pressure protection control Compressor Protection Control Gas leak detection controlValve close detection control Pump down operation SW1 Servicing Mode14.1 CU-2E18NBU Test Run operationMode priority function Wiring Error checkPower Save Mode Cooling only functionTroubleshooting Guide Self Diagnosis FunctionPage Page Removing the Cabinet Top Plate and Cabinet Front Plate Disassembly and Assembly InstructionsOutdoor Unit Removal Procedure Remove the Control Board Cover and Particular PlatesRemoving the Control P.C. Board Removing the Propeller Fan and Fan MotorPage One Indoor Unit Operation Technical DataOperation Characteristics 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.