Panasonic CS-S12NKUW-1, CS-S18NKU-1, CS-S22NKU-1 Troubleshooting Guide, Refrigeration Cycle System

Page 57

14. Troubleshooting Guide

14.1 Refrigeration Cycle System

In order to diagnose malfunctions, ensure the air conditioner is free from electrical problems before inspecting the refrigeration cycle. Such problems include insufficient insulation, problem with the power source, malfunction of a compressor and a fan. The normal outlet air temperature and pressure of the refrigeration cycle depends on various conditions, the standard values for them are shown in the table to the right.

Normal Pressure and Outlet Air Temperature (Standard)

 

Gas Pressure

Outlet air

 

PSI

Temperature

 

(kg/cm2G)

(°F)

Cooling Mode

130.5 ~ 174.0

53.6 ~ 60.8

(9 ~ 12)

 

 

 

 

 

Condition: Indoor fan speed = High

Outdoor temperature = 95°F at cooling mode. Compressor operate at rated frequency

Different in the intake

 

 

 

Measuring the air

and outlet

 

 

Normal

 

 

 

temperature different

air temperatures

More than 46.4°F

 

 

 

 

 

 

 

 

 

 

(15 minutes after an

 

 

 

 

operation is started) at

 

 

 

 

cooling mode.

 

 

 

Less than 46.4°F at the cooling mode

 

 

 

Value of electric current

Higher than specified

Dusty condenser

Measuring electric current

 

 

during operation

 

 

preventing heat radiation

 

during operation

 

 

 

Excessive amount

 

 

 

 

 

of refrigerant

 

 

Lower than specified

 

 

 

 

 

Cooling

High

 

 

 

Gas side

Mode

Inefficient compressor

Measuring gas side

 

 

pressure

 

 

 

 

pressure

 

 

Low

Insufficient refrigerant

 

 

 

 

 

 

 

 

 

Low

Clogged strainer or

 

 

 

 

 

capillary cube

 

 

 

 

 

57

 

 

Image 57
Contents Indoor Unit Outdoor Unit CU-S12NKU-1CS-S18NKU-1 CU-S18NKU-1 CS-S22NKU-1 CU-S22NKU-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 ControlDimensions 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 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 DirectionQuiet Operation Cooling Mode/Cooling Area of Dry Mode 11.5.1 Vertical AirflowHorizontal 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 OperationLow Pressure Protection Control Gas Leakage Detection Low Frequency Protection Control12.4.2 S18NK, S22NK 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 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.