Panasonic CU-2E18NBU service manual

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Order No: PHAAM1111120A1

Outdoor Unit

CU-2E18NBU

Please file and use this manual together with the service manual for Model No. CS-E9NKUAW CS-E12NKUAW, Order No. PHAAM1111087C1.

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

PRECAUTION OF LOW TEMPERATURE

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

TABLE OF CONTENTS

1.

Safety Precautions

3

2.

Specifications

5

 

2.1

CU-2E18NBU

5

3.

Dimensions

8

4.

Refrigeration Cycle Diagram

9

5.

Block Diagram

10

6.

Wiring Connection Diagram

11

7.

Electronic Circuit Diagram

12

8.

Printed Circuit Board

13

 

8.1

Main Printed Circuit Board

13

 

8.2

Noise Filter Printed Circuit Board

14

 

8.3

Display Printed Circuit Board

14

9.

Installation Information

15

 

9.1

Check Points

15

10. Installation Instruction

16

10.1

Select The Best Location

16

10.2

Install The Outdoor Unit

17

10.3

Connect the Piping

17

10.4

Evacuation of the Equipment

18

10.5Connect The Cable To The Outdoor

 

 

Unit

19

10.6

Heat Insulation

19

11.

Operation Control

20

11.1

Cooling Operation

20

11.2

Heating Operation

21

12.

Simultaneous Operation Control

22

13.

Protection Control

23

13.1

Freeze Prevention control (Cool)

23

13.2

Dew Prevention control (Cool)

23

13.3Electronic Parts Temperature Rise

Protection 1 (Cool)

23

© Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011. Unauthorized copying and distribution is a violation of law.

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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 InformationSelect The Best Location Installation InstructionOutdoor 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 OperationValve close detection control Compressor Protection Control Gas leak 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 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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