Panasonic CU-S12NKU-1 Low Pressure Protection Control Gas Leakage Detection, 12.4.2 S18NK, S22NK

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12.4.2S18NK, S22NK

Overheating Prevention Control

o When the IPM temperature rises to 212°F, compressor operation will stop immediately. o Compressor operation restarts after 3 minutes the temperature decreases to 203°F.

DC Peak Current Control

o When electric current to IPM exceeds set value of 29.9A, the compressor will stop operate. Then, operation will restart after 3 minutes.

o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will restart after 2 minute.

o If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart after 1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off.

12.5Compressor Overheating Prevention Control (For S18, S22NK only)

Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below.

If compressor discharge temperature exceeds 233.6°F, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking. “F97” is indicated.

12.6Low Pressure Protection Control (Gas Leakage Detection)

Control start conditions

o For 5 minutes, the compressor continously operates and outdoor total current is between 0.66A and 1.25A (S9NK and S12NK) or 0.81A and 1.23A (S18NK and S22NK).

o During Cooling and Soft Dry operation:

Indoor suction temperature – indoor piping temperature is below 39.2°F

Control contents

o Compressor stops (and restart after 3 minutes).

o If the conditions above happened 2 times within 20 minutes, the unit will:

ƒStop operation

ƒTimer LED blinks and “F91” indicated.

12.7Low Frequency Protection Control 1

When the compressor operates at frequency lower than 26Hz continued for 20 minutes, the operation frequency will be changed to 25Hz for 2 minutes. (For S9NK and S12NK)

When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency will be change to 24Hz for 2 minutes. (For S18NK and S22NK)

12.8Low Frequency Protection Control 2

When all below conditions comply, minimum limit of compressor frequency will be set.

Temperature, T, for:

Cooling / Soft Dry

S9NK and S12NK

S18NK and S22NK

 

 

 

 

Indoor intake air (°F)

T < 59 or T ≥ 86

T < 57.2 or ≥ 86

Outdoor air (°F)

T < 60.8 or T ≥ 100.4

T < 55.4 or T ≥ 100.4

Indoor heat exchanger (°F)

T < 86

T < 86

 

 

 

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Contents CS-S18NKU-1 CU-S18NKU-1 CS-S22NKU-1 CU-S22NKU-1 Indoor Unit Outdoor UnitCU-S12NKU-1 Table of Contents Items to be followed are classified by the symbols Safety PrecautionsPage CU-S9NKU-1 CU-S12NKU-1 ARI SpecificationDRY Bulb WET Bulb CS-S18NKU-1 CS-S22NKU-1 Piping Location of Controls and Components Indoor Unit Outdoor Unit Remote ControlCS-S9NKUW-1 CS-S12NKUW-1 DimensionsIndoor Unit 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 Main Printed Circuit Board Printed Circuit BoardPower Printed Circuit Board Indicator Printed Circuit Board CU-S9NKU-1 CU-S12NKU-1 CU-S18NKU-1 CU-S22NKU-1 Indoor/Outdoor Unit Installation Diagram Installation Instruction10.1 S9NKUW-1 S12NKUW-1 Select the Best LocationIndoor Unit How to Fix Installation PlateThis can be used for left rear piping and bottom piping also Connect the Cable to the Indoor Unit Page Outdoor Unit Install the 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 Operation Control Internal Setting TemperatureBasic Function Cooling OperationOutdoor Fan Motor Operation For S9NK and S12NK Indoor Fan Motor OperationOutdoor Fan Motor Operation For S18NK and S22NK Airflow DirectionHorizontal Airflow Quiet Operation Cooling Mode/Cooling Area of Dry Mode11.5.1 Vertical Airflow Timer Control Powerful Mode OperationOn Timer Control OFF Timer ControlIndication Panel LED Power Timer Quiet PowerfulIPM Power Transistor Prevention Control Restart Control Time Delay Safety ControlProtection Control 12.2 30 Seconds Forced Operation12.4.2 S18NK, S22NK Low Pressure Protection Control Gas Leakage DetectionLow Frequency Protection Control Cooling Overload Control Outdoor Air Temperature ControlFreeze Prevention Control Dew Prevention ControlAuto Off/On Button Servicing ModeReset RC Remote Control ButtonReset AC TimerRefrigeration Cycle System Troubleshooting GuideCondition Cooling Mode Air conditioner Breakdown Self Diagnosis Function To Display Memorized Error Code Protective OperationSelf Diagnosis Function Three Digits Alphanumeric Code To Make a DiagnosisAbnormality / Protection control Error Code Table14.4.1 H11 Indoor/Outdoor Abnormal Communication Troubleshooting Flowchart14.4.2 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 To remove front grille Disassembly and Assembly InstructionsTo remove discharge grille Page Page CS-S9NKUW-1 CU-S9NKU-1 Technical DataOperation Characteristics 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.

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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.