WARNING

Be sure to comply with local codes on running the wire from the indoor unit to the outdoor unit (size of wire and wiring method, etc.).

Each wire must be firmly connected.

No wire should be allowed to touch refrigerant tubing, the compressor, or any moving part.

Be sure to connect power wires correctly match- ing up numbers on terminals of the outdoor unit and respective indoor units A – D.

CAUTION

Be sure to connect the power supply line to the outdoor unit as shown in the wiring diagram. The indoor unit draws its power from the outdoor unit.

Do not run wiring for antenna, signal, or power lines of television, radio, stereo, telephone, secu- rity system, or intercom any closer than 3'4" (1 m) from the power cable and wires between the indoor and outdoor units. Electrical noise may affect the operation.

5-3. Wiring System Diagram

3 indoor units with CU-3KE19NBU

*Disconnectswitch

 

 

 

Field

supply

 

 

 

 

 

 

 

 

INDOORUNIT

 

1

 

230/208V

 

OUTDOOR UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

Terminal

2

 

230/208V

(B)

Terminal(9P)

 

 

 

(A)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

230/208V

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

Grounding

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Disconnect

 

Field supply

 

(B)

 

 

 

230/208VACphase-Single60HZ

 

 

 

switch

 

 

 

 

 

 

 

 

INDOORUNIT

 

 

 

230/208V

 

(B)

 

 

 

 

 

 

1

 

 

 

4

 

 

 

 

 

 

 

 

 

UNITCB

supply

 

 

Terminal

3

 

230/208V

(C)

(B)

6

 

 

 

 

 

 

 

 

(B)

 

 

2

 

 

 

 

5

 

 

 

 

 

 

 

 

230/208V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grounding

 

 

 

 

 

 

 

*switchDisconnect

 

 

 

line

7

 

 

 

 

 

 

Field supply

230/208V

 

 

 

 

 

UNITINDOOR

Terminal

1

 

(B)

230/208V

8

UNIT

L1Power

L2

lineGrounding

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

(C)

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

230/208V

(B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grounding

 

 

 

1

 

 

 

 

 

 

 

 

line

 

 

Terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(2P)

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(A)

 

 

Fig. 25a

WARNING

To avoid the risk of electric shock, each air conditioner unit must be grounded.

For the installation of a grounding device, please observe local electrical codes.

Grounding is necessary, especially for units using inverter circuits, in order to release charged electricity and electrical noise caused by high tension. Otherwise, electrical shock may occur.

Place a dedicated ground more than 7' (2 m) away from other grounds and do not have it shared with other electric appliances.

*NOTE

Disconnect switch may be required by national or local codes.

CAUTION

Always comply with national and local code requirements.

4 indoor units with CU-4KE24NBU, CU-4KE31NBU

 

 

 

*Disconnect

 

 

 

 

 

 

 

 

 

 

 

switch

Field supply

 

 

 

 

 

 

 

INDOORUNIT

 

1

 

 

 

230/208V

OUTDOOR UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Terminal

2

 

switch

230/208V

Terminal(12P)

 

 

 

(A)

(C)

 

(B)

3

AUNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

230/208V

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grounding line

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

*Disconnect

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNITINDOOR

 

 

 

Field

supply

(B)

 

 

 

 

 

 

Terminal

1

 

 

6

BUNIT

 

 

 

 

 

 

 

 

(B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

230/208V

4

 

 

 

 

(B)

 

 

(C)

 

 

 

 

 

 

 

 

 

 

3

 

 

230/208V

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

230/208V

 

 

 

 

 

 

 

 

 

 

 

 

 

(B)

 

 

 

60HZ

 

 

 

 

 

Grounding

line

 

 

 

 

 

 

 

 

 

 

*Disconnect

switch

 

 

 

 

 

UNITINDOOR

Terminal

 

(Inter-unit)

 

Field

supply

 

CUNIT

supply

230/208VACphase-Single

 

 

 

 

 

(B)

 

 

 

 

 

1

power line

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

230/208V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(C)

 

 

2

230/208V

(C)

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

9

 

 

 

 

 

 

 

230/208V

 

 

(B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grounding

 

 

 

 

 

 

 

 

 

 

 

line

 

 

230/208V

10

 

L1Power

 

 

 

UNITINDOOR

Terminal

*Disconnect

switch

 

 

 

DUNIT

L2

lineGrounding

 

 

 

 

Terminal (2P)

 

 

 

Field

supply

 

 

 

11

 

 

 

 

 

 

 

1

 

 

 

 

(B)

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

230/208V

 

 

 

 

 

 

(D)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

230/208V

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

(C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grounding

 

(B)

 

2

 

 

 

 

 

 

 

line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(A)

 

 

Fig. 25b

23

Page 119
Image 119
Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU service manual Disconnect switch may be required by national or local codes

CU-3KE19NBU, CU-4KE24NBU, CU-4KE31NBU specifications

The Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are high-efficiency air conditioning units that represent Panasonic's commitment to innovative climate control solutions. These models integrate advanced technologies to deliver superior performance, energy savings, and user comfort, making them ideal for both residential and commercial applications.

The CU-4KE24NBU, a part of the ECOi series, is designed for medium-sized spaces. It boasts an impressive cooling capacity, ensuring optimal temperature regulation. Its inverter technology adjusts the compressor speed according to the needs of the environment, resulting in reduced energy consumption and consistent comfort levels. The unit operates quietly, making it suitable for bedrooms, offices, or other noise-sensitive environments. Additionally, it features a robust air filtration system that improves indoor air quality by removing dust and allergens.

The CU-4KE31NBU offers a slightly higher capacity, making it perfect for larger areas. Like its counterpart, it utilizes inverter technology, which not only enhances energy efficiency but also minimizes wear and tear on the components, leading to a longer lifespan. Its multi-split capability allows for the connection of multiple indoor units to a single outdoor unit, providing flexibility in installation. The CU-4KE31NBU also integrates smart technology that allows users to control the system remotely via smartphones, giving them greater convenience and control over their environment.

For applications requiring a more compact option, the CU-3KE19NBU is an excellent choice. This model balances size and power, offering a competitive cooling capacity that can easily service small to medium-sized rooms. The unit is designed for easy installation and maintenance, featuring a lightweight construction that simplifies handling by technicians. The efficient inverter technology ensures that users benefit from lower energy bills while maintaining a consistent indoor climate.

All three models are equipped with Panasonic’s advanced refrigerants, which contribute to their eco-friendly performance. These refrigerants help reduce greenhouse gas emissions while maintaining high efficiency. Moreover, the units come with built-in diagnostic capabilities, allowing for quick detection of any issues, thus ensuring that the systems operate at peak efficiency throughout their lifespan.

In summary, the Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are exemplary air conditioning solutions that combine cutting-edge technology with user-friendly features, ensuring that they meet the varying needs of today's consumers while promoting energy efficiency and sustainability.