8-2. Protective Functions

Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

1.Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 43°F(6°C).

2.Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 46°F(8°C) or above.

Indoor heat exchanger

temperature °F(°C)

46

 

 

C

(8)

 

 

 

43

A

B

 

(6)

 

 

 

36

 

 

 

(2)

 

 

 

*

 

 

 

 

 

a

b

c

d

a.Area: Automatic capacity control

b.When the temperature drops below Point A, the operation frequency is reduced by a certain proportion.

c.Area: Frequency increase is prohibited.

d.When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area.

*When the temperature drops to below 36°F(2°C) (continuously for 2 minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

NOTE (CLxx models only)

The Freeze Prevention Control during the Low Ambient Cooling Mode (outside air temperature:59°F(15°C) or lower) is as follows. The compressor stops when the temperature of indoor heat exchanger becomes less than 36°F(2°C).

The compressor restarts when the temperature of indoor heat exchanger becomes 46°F(8°C) or higher.

Compressor discharge temperature control

This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature.

Compressor discharge temperature °F(°C)

Approx.

A

 

 

214

 

 

 

(101)

 

 

 

Approx.

 

 

B

201

 

 

 

 

 

(94)

 

 

 

a

b

c

d

a.Area: Automatic capacity control.

b.When the temperature rises above Point A, the operation frequency is reduced at a specified rate.

c.Area: Further frequency increase is prohibited.

d.When the temperature falls below Point B, prevention of a rise in frequency is released and the air conditioner operates as in a area.

*The compressor will stop if the temperature of the compressor discharge exceeds 248°F(120°C) due to shortage of gas or other reason.

CT (Peak current cut-off control)

This function prevents the circuit breaker or fuse from operating to open the circuit. This function works when electrical current has increased due to an increase in the cooling load,

or to a decrease in the power supply voltage. In these cases, operation frequency is reduced or operation is interrupted auto- matically to control the electrical current for operation.

When the cause of the increase in electrical current is rectified, the system will resume operation in the original mode.

< CS-KS18NKU >

 

(A)

 

Cooling

Dry

 

 

 

Peak current cut-off trips

17.5

 

Hz down

11.0

 

< CS-KS24NKU >

 

(A)

 

 

 

 

Cooling

Dry

Peak current cut-off trips

22.5

 

Hz down

14.0

 

 

 

 

46

Page 46
Image 46
Panasonic CS-KS24NKU, CU-KS24NKU Protective Functions, Freeze prevention, Compressor discharge temperature control

CU-KS24NKUA, CS-KS24NKU, CU-KS24NKU specifications

The Panasonic CU-KS24NKUA, CU-KS24NKU, and CS-KS24NKU are a part of the company’s advanced air conditioning lineup, known for their efficient performance and user-friendly features. Designed to provide optimal cooling while ensuring energy efficiency, these models cater to both residential and commercial spaces, making them an ideal choice for various settings.

One of the standout features of the Panasonic CU-KS24NKUA and its counterparts is their inverter technology. This innovative approach allows the air conditioning units to adjust their cooling capacity based on the room's temperature, thus ensuring that they operate at peak efficiency. By minimizing energy consumption during low demand, the units not only lower electricity bills but also reduce environmental impact.

The CU-KS24NKU series is equipped with a powerful compressor that delivers high cooling performance, capable of rapidly cooling spaces even in extreme heat conditions. Additionally, with a robust SEER (Seasonal Energy Efficiency Ratio) rating, these models rank among the top in energy savings, making them suitable for energy-conscious consumers.

Continuous airflow is vital for maintaining a comfortable indoor environment, and the CS-KS24NKU includes features that enhance air circulation. Utilizing a multi-directional airflow system, these units ensure that cool air is distributed evenly throughout the room, minimizing hot spots and maximizing comfort.

Another significant characteristic of the Panasonic air conditioners is their silent operation. Designed with low noise levels in mind, these units ensure that cooling does not come at the expense of peace and quiet, making them perfect for bedrooms or offices where a tranquil environment is essential.

In addition to performance, the Panasonic CU-KS24NKUA, CU-KS24NKU, and CS-KS24NKU are also equipped with comprehensive filtration systems. These filters capture dust, allergens, and pollutants, promoting better air quality within indoor spaces. This is particularly beneficial for individuals with allergies or respiratory concerns.

Remote control and smart capabilities are also integral features, allowing users to operate and schedule their air conditioner from anywhere within the home. This convenience adds a layer of flexibility to managing indoor climates, especially in today's fast-paced world.

In summary, the Panasonic CU-KS24NKUA, CU-KS24NKU, and CS-KS24NKU air conditioning units represent a perfect blend of advanced technology, energy efficiency, and user comfort. Their inverter technology, effective air distribution, quiet operation, and enhanced air filtration make them a valuable addition for those seeking reliable climate control while prioritizing sustainability and comfort.