Panasonic CU-S22NKU-1, CS-S18NKU-1 Outdoor Air Temperature Control, Cooling Overload Control

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12.9Outdoor Air Temperature Control

The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.

This control will begin 1 minute after the compressor starts.

Compressor frequency will adjust based on outdoor air temperature.

100.4°F or 77°F (For S18/22NK)

Free

98.6°F or 71.6°F (For S18/22NK)

Limited Frequency

Outdoor air temperature

12.10 Cooling Overload Control

Pipe temperature limitation / restriction.

o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor operation frequency)

o The compressor stops if outdoor pipe temperature exceeds 141.8°F (for S9NK and S12NK), 145.4°F (for S18NK and S22NK).

o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise protection)

12.11 Freeze Prevention Control

When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops operation.

Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 55.4°F.

At the same time, indoor fan speed will be higher than during its normal operation.

If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its normal operation.

12.12 Freeze Prevention Control 2

Control start conditions

o During Cooling operation and soft dry operation

ƒDuring thermo OFF condition, indoor intake temperature is less than 50°F or

ƒCompressor stops for freeze prevention control

oEither one of the conditions above occurs 5 times in 60 minutes.

Control contents

oOperation stops

oTimer LED blinks and “H99” indicated

12.13 Dew Prevention Control

To prevent dew formation at indoor unit discharge area.

This control will be activated if:

o Cooling mode or Quiet mode is activated.

o Remote control setting temperature is less than 77°F. o Fan Speed is at CLo or QLo.

o Room temperature is constant (±33.8°F) for 30 minutes. o Compressor is continuously running.

Fan speed will be adjusted accordingly in this control.

o Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.

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Contents Indoor Unit Outdoor Unit CU-S12NKU-1CS-S18NKU-1 CU-S18NKU-1 CS-S22NKU-1 CU-S22NKU-1 Table of Contents Safety Precautions Items to be followed are classified by the symbolsPage Specification CU-S9NKU-1 CU-S12NKU-1 ARIDRY Bulb WET Bulb CS-S18NKU-1 CS-S22NKU-1 Piping Indoor Unit Outdoor Unit Remote Control Location of Controls and ComponentsDimensions Indoor UnitCS-S9NKUW-1 CS-S12NKUW-1 CS-S18NKU-1 CS-S22NKU-1 CU-S9NKU-1 CU-S12NKU-1 CU-S18NKU-1 CU-S22NKU-1 Refrigeration Cycle Diagram CS-S18NKU-1 CU-S18NKU-1 CS-S22NKU-1 CU-S22NKU-1 Block Diagram CS-S18NKU-1 CU-S18NKU-1 CS-S22NKU-1 CU-S22NKU-1 Wiring Connection Diagram CS-S18NKU-1 CS-S22NKU-1 CU-S9NKU-1 CU-S12NKU-1 CU-S18NKU-1 CU-S22NKU-1 Electronic Circuit Diagram CS-S18NKU-1 CS-S22NKU-1 Outdoor Unit CU-S18NKU-1 CU-S22NKU-1 Printed Circuit Board Main Printed Circuit BoardPower Printed Circuit Board Indicator Printed Circuit Board CU-S9NKU-1 CU-S12NKU-1 CU-S18NKU-1 CU-S22NKU-1 10.1 S9NKUW-1 S12NKUW-1 Installation InstructionIndoor/Outdoor Unit Installation Diagram Select the Best LocationHow to Fix Installation Plate Indoor UnitThis can be used for left rear piping and bottom piping also Connect the Cable to the Indoor Unit Page Install the Outdoor Unit Outdoor UnitGas leak checking Piping Insulation 10.2 S18NKU-1 S22NKU-1 How to Fix Installation Plate This can be used for left rear piping and bottom piping also Connect the Cable to the Indoor Unit Page Model S18NKU-1 Evacuation of the equipment Piping Insulation Basic Function Internal Setting TemperatureOperation Control Cooling OperationOutdoor Fan Motor Operation For S18NK and S22NK Indoor Fan Motor OperationOutdoor Fan Motor Operation For S9NK and S12NK Airflow DirectionQuiet Operation Cooling Mode/Cooling Area of Dry Mode 11.5.1 Vertical AirflowHorizontal Airflow On Timer Control Powerful Mode OperationTimer Control OFF Timer ControlLED Power Timer Quiet Powerful Indication PanelProtection Control Restart Control Time Delay Safety ControlIPM Power Transistor Prevention Control 12.2 30 Seconds Forced OperationLow Pressure Protection Control Gas Leakage Detection Low Frequency Protection Control12.4.2 S18NK, S22NK Freeze Prevention Control Outdoor Air Temperature ControlCooling Overload Control Dew Prevention ControlServicing Mode Auto Off/On ButtonReset AC Remote Control ButtonReset RC TimerTroubleshooting Guide Refrigeration Cycle SystemCondition Cooling Mode Air conditioner Self Diagnosis Function Three Digits Alphanumeric Code To Display Memorized Error Code Protective OperationBreakdown Self Diagnosis Function To Make a DiagnosisError Code Table Abnormality / Protection controlTroubleshooting Flowchart 14.4.1 H11 Indoor/Outdoor Abnormal Communication14.4.2 H12 Indoor/Outdoor Capacity Rank Mismatched 14.4.3 H14 Indoor Intake Air Temperature Sensor Abnormality 14.4.4 H15 Compressor Temperature Sensor Abnormality 14.4.5 H16 Outdoor Current Transformer Open Circuit 14.4.6 H19 Indoor Fan Motor DC Motor Mechanism Locked 14.4.7 H23 Indoor Pipe Temperature Sensor Abnormality 14.4.8 H27 Outdoor Air Temperature Sensor Abnormality 14.4.9 H28 Outdoor Pipe Temperature Sensor Abnormality Malfunction Decision Conditions 14.4.11 H33 Unspecified Voltage between Indoor and Outdoor 14.4.12 H97 Outdoor Fan Motor DC Motor Mechanism Locked 14.4.13 H98 Indoor High Pressure Protection Malfunction Decision Conditions 14.4.15 F11 Indoor Pipe Temperature Sensor Abnormality 14.4.16 F90 Power Factor Correction Protection 14.4.17 F91 Refrigeration Cycle Abnormality 14.4.18 F93 Compressor Rotation Failure 14.4.19 F95 Cooling High Pressure Abnormality 14.4.20 F96 IPM Overheating 14.4.21 F97 Compressor Overheating 14.4.22 F98 Input Over Current Detection 14.4.23 F99 Output Over Current Detection Disassembly and Assembly Instructions To remove front grilleTo remove discharge grille Page Page Technical Data Operation CharacteristicsCS-S9NKUW-1 CU-S9NKU-1 Page CS-S12NKUW-1 CU-S12NKU-1 Page CS-S18NKU-1 CU-S18NKU-1 Page CS-S22NKU-1 CU-S22NKU-1 Page Exploded View and Replacement Parts List CS-S12NKUW-1 Remark CS-S18NKU-1 CS-S22NKU-1 CS-S22NKU-1 Remark Outdoor Unit CU-S12NKU-1 Remark CU-S18NKU-1 CU-S22NKU-1 CU-S22NKU-1 Remark
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CS-S9NKUW-1, CS-S22NKU-1, CU-S18NKU-1, CS-S18NKU-1, CS-S12NKUW-1 specifications

Panasonic has long been a leader in the HVAC industry, and its latest range of air conditioning units—including the CU-S9NKU-1, CU-S12NKU-1, CU-S22NKU-1, CS-S12NKUW-1, and CS-S18NKU-1—showcases innovative features and robust technologies designed to enhance home comfort while reducing energy consumption.

The CU-S9NKU-1 model is notable for its compact design, making it ideal for smaller spaces without sacrificing performance. It boasts advanced inverter technology, enabling precise temperature control and energy efficiency. The built-in air purification system ensures that indoor air quality remains high, filtering out allergens and pollutants.

Similarly, the CU-S12NKU-1 variant provides a balance of power and efficiency for medium-sized rooms. This model incorporates a quiet operation feature, making it a perfect choice for bedrooms and living areas where noise levels need to be minimized. The adjustable airflow louvers ensure that air is distributed evenly throughout the space.

For larger spaces, the CU-S22NKU-1 stands out with its high cooling and heating capacity. This model is equipped with a dual inverter compressor that enhances both efficiency and performance, providing rapid cooling or heating when needed. The user-friendly remote control and smart connectivity options allow homeowners to adjust settings conveniently, even when they’re away from home.

The CS-S12NKUW-1 model features a sleek design and additional functionalities like the Eco Mode and Sleep Mode. Eco Mode adjusts the power consumption based on the user’s preferences, while Sleep Mode operates at low noise levels, promoting a restful environment during nighttime hours.

Lastly, the CS-S18NKU-1 combines innovative technology with aesthetic appeal. Its modern design is meant to complement contemporary interiors, and its high seasonal energy efficiency ratio (SEER) indicates strong performance in cooling seasons. Additionally, this model includes several energy-saving modes that adapt to changing thermal loads, ensuring that energy wastage is minimized.

Overall, Panasonic’s CU and CS series air conditioning units offer an impressive blend of technology and design, making them suitable for various needs and spaces while focusing on energy efficiency and user comfort. Whether for residential or light commercial use, these models provide reliable, effective solutions for climate control.