Panasonic CU-2E18NBU service manual Evacuation of the Equipment, Cutting and Flaring the Piping

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CUTTING AND FLARING THE PIPING

1Please cut using pipe cutter and then remove the burrs.

2Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe.

3Please make flare after inserting the flare nut onto the copper pipes.

10.4 Evacuation of the Equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

1Connect a charging hose with a push pin to the Low side of a charging set and the service port of the gas side 3-way valve.

2Connect the micron gauge between vacuum pump and service port of outdoor units.

3Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a value of 500 microns.

4To make sure micron gauge a value

500 microns and close the low side valve of the charging set and turn off the vacuum pump.

5Disconnect the vacuum pump house from the service port of the 3-way valve.

6Tighten the service port caps of gas side

3-way valve at a torque of 13.3 Ibf.ft with a torque wrench.

7Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “Open” using a hexagonal wrench (5/32").

8Mount valve caps onto the 2-way valve and 3-way valve.

o Be sure to check for gas leakage.

šIf micron gauge value does not descend 500 microns, take the following measures:

-If the leak stops when the piping connections are tightened further, continue working from step e.

-If the leak does not stop when the connections are retightened, repair location of leak.

-Do not release refrigerant during piping work for installation and reinstallation.

-Take care when handling the liquid refrigerant, it may cause frostbite.

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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 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 Protection Control Gas leak detection control Valve close detection controlCompressor discharge high pressure protection 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 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.
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