Panasonic CU-2S18NBU-1 service manual

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WARNING

During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while

20.compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

21.After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant contacts with fire.

22.Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when the refrigerant contacts with fire.

23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.

24.Must not use other parts except original parts describe in catalog and manual.

25.Using of refrigerant other than the specified type may cause product damage, burst and injury etc.

CAUTION

1.Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire.

2.Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture.

3.Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage.

4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.

5.Select an installation location which is easy for maintenance.

Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use

6.a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C). Pb free solder will tend to splash when heated too high (about 1100°F / 600°C).

Power supply connection to the air conditioner.

Power supply cord shall be UL listed or CSA approved 4 conductors with minimum AWG12 wires.

7.Power supply point should be in an easily accessible place for power disconnection in case of emergency. In some countries, permanent connection of this air conditioner to the power supply is prohibited.

Fix power supply connection to a circuit breaker for the permanent connection.

Use NRTL approved fuse or circuit breaker (rating refers to name plate) for the permanent connection.

8.Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take care of the liquid refrigerant, it may cause frostbite.

9.Installation or servicing work: It may need two people to carry out the installation or servicing work.

10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

11. Do not sit or step on the unit, you may fall down accidentally.

12. Do not touch the sharp aluminum fin, sharp parts may cause injury.

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Contents Table of Contents Disassembly and Assembly Instructions Safety Precautions Items to be followed are classified by the symbolsPage Specification Model Outdoor Unit CU-2S18NBU-1Multi split combination possibility Dimensions Refrigeration Cycle Diagram Block Diagram Wiring Connection Diagram Electronic Circuit Diagram Printed Circuit Board Main Printed Circuit BoardNoise Filter Printed Circuit Board Installation Information Check PointsInstallation Instruction Outdoor Unit Installation DiagramOutdoor Unit Installation Guidelines Connecting the Piping to Outdoor Unit Gas Leak CheckingEvacuation of the Equipment Heat Insulation Powerful Operation Operation ControlCooling Operation Outdoor fan controlElectronic Parts Temperature Rise Protection 1 Cool Electronic Parts Temperature Rise Protection 2 CoolProtection Control Freeze Prevention control CoolTime Delay Safety Control Restart Control IPM power transistor Protection ControlCooling overload control Cool 12.7 30 seconds Force OperationValve close detection control Compressor Protection Control Gas leak detection controlCompressor discharge high pressure protection control Servicing Mode Wiring Error CheckPump Down Operation Test OperationPower Save Mode Mode priority functionTroubleshooting Guide Self Diagnosis FunctionIndoor high Check indoor heat Exchanger Disassembly and Assembly Instructions Outdoor Unit Removal ProcedureRemoving the Cabinet Top Plate and Cabinet Front Plate Remove the Control Board Cover and Particular PlatesRemoving the Control P.C. Board Removing the Propeller Fan and Fan MotorPage 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