Panasonic CU-2E18NBU service manual Wiring Error check, Power Save Mode, Mode priority function

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14.1.3Wiring Error check

šThe unit capable to correct the wiring error automatically by following procedures. o Confirm the valve on the liquid side and gas side is open.

o Press WIRING CHECK button (SW3) on the Service PCB inside the outdoor unit for more than 10 seconds to start wiring check operation.

o Wiring check process will complete in approximately 10 minutes. However, wiring check operation will not start within 3 minutes after compressor is stopped. When outdoor air temperature is less than 41°F or unit has abnormality, wiring check will not start. (See NOTE 2)

šThe LED 2 to LED 6 in Service PCB inside the outdoor unit indicate the possibility of the correction as shown in the table below:

LED

2

 

3

 

4

 

5

 

6

Message

 

 

 

 

 

 

 

 

 

 

 

Room

A

 

B

 

-

 

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

All flashing

 

Automatic correction impossible

 

 

 

Status

LED2, 4, 6 and LED 3, 5

Wiring check in progress

alternatively flashing

 

 

Flashing one after

 

Automatic correction completed

 

 

 

 

another

 

 

 

 

 

 

 

 

 

 

 

 

 

Other than above

 

Unit has abnormality (NOTE 4)

 

 

 

 

 

 

 

 

 

 

 

šIf automatic correct is impossible, check the indoor unit wiring and piping manually.

NOTE:

1For two rooms connection, LED 4 and 5 are not illuminated after wiring operation complete.

2If the outdoor air temperature is less than 41°F or unit has abnormality, wiring operation will not start.

3After wiring check operation is complete, LED indication will illuminated until normal operation starts.

4Follow the product diagnosis procedure.

5When LED 1 only illuminate, indicates that outdoor unit is operating normally.

14.1.4Power Save Mode

šPower Save Mode can be enabled by pushing POWER SAVE switch (SW4) to ON before power supply ON.

šWhen Power Save Mode is ON, the unit can be operate at lower running current where the breaker capacity not achieve the requirement.

14.1.5Mode priority function

šMode priority function can be enabled by pushing MODE PRIORITY switch (SW5) to ON before power supply ON.

šWhen Mode Priority Function is ON, the mode priority is given to higher capacity indoor units.

14.1.6Cooling only function

šThe unit capable to limit the operation mode to Cooling Mode only (Heating mode disabled) by cutting JP1 (COOL ONLY) before power supply ON.

šThis function prevent wrong operation during the unit installed in server room.

šThis function could be disabled again by short the JP1 (COOL ONLY) before power supply ON.

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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 PointsSelect The Best Location Installation InstructionOutdoor 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 OperationValve close detection control Compressor Protection Control Gas leak 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 Operation Characteristics Technical DataOne 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.
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