Manuals / Panasonic / Household Appliance / Air Conditioner

Panasonic CU-2E18NBU service manual Cooling overload control Cool, Heating overload control Heat

Models: CU-2E18NBU

1 57

Download 57 pages 29.38 Kb

Page 24

Image 24

13.5 Cooling overload control (Cool)

This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation.

13.6 Heating overload control (Heat)

This control detect indoor pipe temperature and perform the compressor frequency restriction during heating operation.

This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.

13.7 Extreme Low Temperature Compressor low pressure protection control (Heat)

This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to improve the compressor reliability.

During heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated. Compressor frequency restriction will be based on outdoor piping temperature.

Page 24

Image 24

Panasonic CU-2E18NBU service manual Cooling overload control Cool, Heating overload control Heat

Contents

TABLE OF CONTENTS Outdoor Unit CU-2E18NBU16. Disassembly and Assembly Instructions 18. Exploded View and Replacement PartsList 1. Safety Precautions 7.Power supply connection to the air conditioner 2. Specifications 2.1CU-2E18NBUUnit OUTDOOR UNITšMulti split combination possibility UnitOUTDOOR UNIT Indoor unit combination 3. Dimensions 4. Refrigeration Cycle Diagram 5. Block Diagram 6. Wiring Connection Diagram 7. Electronic Circuit Diagram 8. Printed Circuit Board 8.1Main Printed Circuit Board8.2Noise Filter Printed Circuit Board 8.3Display Printed Circuit Board9. Installation Information 9.1Check Points68.6 - 65.6 ft x 0.2 oz/ft = 0.6 oz 10. Installation Instruction 10.1 Select The Best Location10.2 Install The Outdoor Unit 10.3 Connect the PipingOutdoor Unit Installation Guidelines Gas Leak Checking10.4 Evacuation of the Equipment CUTTING AND FLARING THE PIPING10.5 Connect The Cable To The Outdoor Unit 10.6 Heat Insulation11. Operation Control 11.1 Cooling Operation11.2 Heating Operation 11.2.2Powerful Operation11.2.3Powerful Operation 11.2.1Outdoor fan control12.Simultaneous Operation Control 13. Protection Control 13.1 Freeze Prevention control Cool13.2 Dew Prevention control Cool 13.5 Cooling overload control Cool 13.6 Heating overload control Heat13.9 Time Delay Safety Control Restart Control 13.12 IPM power transistor Protection Control13.8 Deice Control 13.10 30 seconds Force Operation13.15 Valve close detection control 14. Servicing Mode 14.1 CU-2E18NBU14.1.3Wiring Error check 14.1.4Power Save Mode14.1.5Mode priority function 14.1.6Cooling only function15. Troubleshooting Guide 15.1 Self Diagnosis FunctionPage Page 16. Disassembly and Assembly Instructions 16.1 Outdoor Unit Removal Procedure16.1.3Removing the Control P.C. Board 16.1.4Removing the Propeller Fan and Fan MotorPage 17. Technical Data 17.1 Operation CharacteristicsšCooling Characteristic šCooling Characteristic Compressor Freq FcšPiping Length Characteristic Cooling šPiping Length Characteristic Cooling Condition Room temperature 81F DBT, 66F WBT Operation condition High fan speed Outdoor temperature 95F DBT Compressor Freq FcšHeating Characteristic šHeating Characteristic Condition Room temperature 68F DBT Operation condition High fan speed Piping Length 24.6ft Compressor Freq FhšPiping Length Characteristic Heating šPiping Length Characteristic Heating Condition Room temperature 68F DBT Operation condition High fan speed Outdoor temperature 47F DBT, 43F WBT Compressor Freq FhšCooling Characteristic 17.1.2Two Indoor Unit OperationCompressor Freq Fc šCooling Characteristic Compressor Freq FcšCooling Characteristic Compressor Freq FcšPiping Length Characteristic Cooling Condition Room temperature 81F DBT, 66F WBT Operation condition High fan speed Outdoor temperature 95F DBT Compressor Freq FcšPiping Length Characteristic Cooling Condition Room temperature 81F DBT, 66F WBT Operation condition High fan speed Outdoor temperature 95F DBT Compressor Freq FcšPiping Length Characteristic Cooling Condition Room temperature 81F DBT, 66F WBT Operation condition High fan speed Outdoor temperature 95F DBT Compressor Freq FcšHeating Characteristic Condition Room temperature 68F DBT Operation condition High fan speed Piping Length 24.6ft Compressor Freq FhšHeating Characteristic Condition Room temperature 68F DBT Operation condition High fan speed Piping Length 24.6ft Compressor Freq FhšHeating Characteristic Condition Room temperature 68F DBT Operation condition High fan speed Piping Length 24.6ft Compressor Freq FhšPiping Length Characteristic Heating Condition Room temperature 68F DBT Operation condition High fan speed Outdoor temperature 47F DBT, 43F WBT Compressor Freq FhšPiping Length Characteristic Heating Condition Room temperature 68F DBT Operation condition High fan speed Outdoor temperature 47F DBT, 43F WBT Compressor Freq FhšPiping Length Characteristic Heating Condition Room temperature 68F DBT Operation condition High fan speed Outdoor temperature 47F DBT, 43F WBT Compressor Freq Fh18. Exploded View and Replacement Parts List REF. NO DESCRIPTION & NAMEQ’TY CU-2E18NBU