Panasonic CU-2S18NBU-1 service manual Heat Insulation

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8.For wire stripping and connection requirement, refer to the diagram below.

9.Secure the power supply cord and connecting cables onto the control board with the holder.

10.Attach the control board cover (metal and resin) and valve cover back to the original position with screw.

10.6 HEAT INSULATION

 

 

Use a material with good heat-resistant properties as the heat insulation for

 

Liquid-side pipes

CAUTION

 

the pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the

 

 

pipes are not adequately insulated, condensation or water leakages may

 

Gas-side pipes

 

occur.

 

 

 

 

 

 

Cutting and Flaring the Piping

1Please cut using pipe cutter and then remove the burrs.

2Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe.

3Please make flare after inserting the flare nut onto the copper pipes.

Material shall

withstand 248°F or

higher

19

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Contents Table of Contents Disassembly and Assembly Instructions Items to be followed are classified by the symbols Safety PrecautionsPage Model Outdoor Unit CU-2S18NBU-1 SpecificationMulti split combination possibility Dimensions Refrigeration Cycle Diagram Block Diagram Wiring Connection Diagram Electronic Circuit Diagram Main Printed Circuit Board Printed Circuit BoardNoise Filter Printed Circuit Board Check Points Installation InformationOutdoor Unit Installation Diagram Installation InstructionOutdoor Unit Installation Guidelines Gas Leak Checking Connecting the Piping to Outdoor UnitEvacuation of the Equipment Heat Insulation Outdoor fan control Powerful OperationOperation Control Cooling OperationFreeze Prevention control Cool Electronic Parts Temperature Rise Protection 1 CoolElectronic Parts Temperature Rise Protection 2 Cool Protection Control12.7 30 seconds Force Operation Time Delay Safety Control Restart ControlIPM power transistor Protection Control Cooling overload control CoolValve close detection control Compressor Protection Control Gas leak detection controlCompressor discharge high pressure protection control Test Operation Servicing ModeWiring Error Check Pump Down OperationMode priority function Power Save ModeSelf Diagnosis Function Troubleshooting GuideIndoor high Check indoor heat Exchanger Remove the Control Board Cover and Particular Plates Disassembly and Assembly InstructionsOutdoor Unit Removal Procedure Removing the Cabinet Top Plate and Cabinet Front PlateRemoving the Propeller Fan and Fan Motor Removing the Control P.C. BoardPage Operation Characteristics Technical DataCS-S9NKUW-1 CU-2S18NBU-1 Page CS-S9NKUW-1x2 CU-2S18NBU-1 Page CS-S12NKUW-1 CU-2S18NBU-1 Page CS-S12NKUW-1x2 CU-2S18NBU-1 Page CS-S12NKUW-1+CS-S9NKUW-1 CU-2S18NBU-1 Page Exploded View and Replacement Parts List REF. no Description & Name QTY Shock Absorber Left