(2)If the self-diagnostics function fails to operate

Check the indoor unit.

Is the fuse blown?

Normal

Replace the controller.

•No indicators illuminate and the indoor fan does not rotate.

•Check the power voltage.

Blown

Replace the circuit board or the fuse.

9-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

No.

Control

Check items (unit operation)

 

 

 

1

Use the remote controller to operate the

• The rated voltage must be present between inter-unit wirings 1 and 2.

 

unit in "TEST run" mode. To determine

• Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the

 

whether the mode is currently in

voltage at both ends is measured, approximately 12 to 15V DC must

 

"TEST run" mode, check the 3 indicator

be output and the multimeter pointer must bounce once every 8

 

lamps on the unit. If all 3 are blinking,

seconds.

 

the current mode is "TEST run."

Or instead of measuring the voltage, you can insert an LED jig and

 

 

check that the LED flickers once every 8 seconds.

 

 

 

If there are no problems with the above, then check the outdoor unit.

For the "Test run" procedure, refer to the Appendix B "Installation Instructions".

(2) Checking the outdoor unit

No.

Control

Check items (unit operation)

 

 

 

 

 

 

 

1

Apply the rated voltage between outdoor

• The control panel LED (red) must illuminate.

 

unit terminals L and N.

 

 

 

 

 

 

 

 

 

 

 

 

2

Short-circuit the outdoor unit COM terminal

• The compressor, fan motor and 4-way valve must all turn on.

 

to the T-RUN terminal.

 

 

 

 

 

 

 

 

 

 

 

 

If there are no problems with the above, then check the indoor unit.

 

Using the TEST/T-RUN terminals

 

 

TEST/T-RUN terminals

 

 

 

 

 

 

 

 

 

 

 

 

 

T-RUN : Test run (compressor and fan motor turn ON).

TEST/MV : Compresses time to 1/60th (accelerates operation by 60 times faster than normal).

(TEST)/MV

T-RUN

COM

53

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Panasonic CZ-18BT1U + CU-KS12NK1A, CS-KS12NB41, CS-KS18NB4UW Checking the Indoor and Outdoor Units, Replace the controller
Page 52 Page 54

CZ-18BT1U + CU-KS18NKU, CZ-18BT1U + CU-KS12NK1A, CZ-18BT1U + CU-KS18NKUA, CS-KS18NB4UW, CS-KS12NB41 specifications

The Panasonic CZ-18BT1U indoor unit, when paired with the appropriate outdoor units like CU-KS18NKU, CU-KS18NKUA, CU-KS12NK1A, CS-KS18NB4UW, and CS-KS12NB41, offers a robust solution for maintaining optimal indoor climates. These units are designed for residential and commercial applications, ensuring reliable heating and cooling performance.

One of the standout features of the Panasonic CZ-18BT1U is its energy efficiency. This model boasts a high Seasonal Energy Efficiency Ratio (SEER), enabling users to enjoy a comfortable environment without incurring excessive energy costs. This is further complemented by advanced inverter technology, which allows for variable speed operation, adjusting the compressor activity based on the cooling or heating needs of the space. This feature not only enhances comfort but also minimizes energy consumption.

The outdoor unit options, CU-KS18NKU, CU-KS18NKUA, and CU-KS12NK1A, support this efficiency with high-performance compressors designed for reduced noise levels. They are built to withstand varied weather conditions, ensuring durability and longevity. The outdoor units also feature high-efficiency heat exchangers that improve thermal performance, enhancing overall system efficiency.

Noise reduction is a critical consideration in HVAC systems, and the Panasonic CS-KS18NB4UW and CS-KS12NB41 outdoor units are engineered with this in mind. They operate at low decibel levels, making them ideal for residential areas where noise can be a concern. Additionally, these units come equipped with a wide range of operational modes, such as cooling, heating, and dehumidification, providing users with year-round comfort.

Flexibility and installation convenience are enhanced by the compact design of both the indoor and outdoor units. This versatility allows for various placement options, making them suitable for different room layouts.

Moreover, these systems incorporate air purification technologies, which help to improve indoor air quality by filtering out pollutants. This feature is especially beneficial for users with allergies or respiratory conditions, ensuring a healthier living environment.

In summary, the Panasonic CZ-18BT1U paired with CU-KS18NKU, CU-KS18NKUA, CU-KS12NK1A, CS-KS18NB4UW, and CS-KS12NB41 units offer an efficient and quiet HVAC solution. With advanced technologies, energy-saving features, and health-oriented design, they are a smart investment for maintaining comfort and improving air quality in any indoor space.
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