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Panasonic CU-2S18NBU-1 - User Manual

Panasonic CU-2S18NBU-1
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© Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011.
Unauthorized copying and distribution is a violation of law.
Order No: PHAAM1111121A1
Outdoor Unit
CU-2S18NBU-1
Please file and use this manual together with the service manual for Model No. CS-S9NKUW-1, CS-S12NKUW-1 Order No. PHAAM1111084C1
TABLE OF CONTENTS
1. Safety Precautions.............................................3
2. Specification.......................................................5
3. Dimensions.........................................................7
4. Refrigeration Cycle Diagram.............................8
5. Block Diagram....................................................9
6. Wiring Connection Diagram............................10
7. Electronic Circuit Diagram..............................11
8. Printed Circuit Board.......................................12
8.1 Main Printed Circuit Board .........................12
8.2 Noise Filter Printed Circuit Board...............13
9. Installation Information ...................................14
9.1 Check Points ..............................................14
10. Installation Instruction.....................................15
10.1 SELECT THE BEST LOCATION ...............15
10.2 INSTALL THE OUTDOOR UNIT................17
10.3 CONNECT THE PIPING............................17
10.4 EVACUATION OF THE EQUIPMENT.......18
10.5 CONNECT THE CABLE TO THE
OUTDOOR UNIT........................................18
10.6 HEAT INSULATION ...................................19
11. Operation Control.............................................20
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerantion circuit.
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Table of Contents

Questions and Answers

  • A
    Anna SmallSep 4, 2025
    What does outdoor current transformer (CT) abnormality mean for my Panasonic CU-2S18NBU-1 Air Conditioner?
    • C
      chadmartinSep 4, 2025
      If your Panasonic Air Conditioner displays an outdoor current transformer (CT) abnormality, this could be due to a faulty current transformer or compressor. Check the outdoor PCB and the compressor for faults.
  • R
    Rachel SmithSep 18, 2025
    What to do if my Panasonic CU-2S18NBU-1 Air Conditioner shows indoor/outdoor misconnection abnormality?
    • S
      stacybassSep 18, 2025
      If your Panasonic Air Conditioner displays an indoor/outdoor misconnection abnormality, this may be because the indoor and outdoor rated voltage are different. Check the indoor and outdoor units.
  • W
    Willie WebbSep 16, 2025
    What does outdoor high pressure sensor abnormality mean on my Panasonic Air Conditioner?
    • M
      Marvin ScottSep 16, 2025
      If your Panasonic Air Conditioner displays an outdoor high pressure sensor abnormality, it's likely due to a high pressure sensor open circuit during compressor stop. Check the high pressure sensor, its lead wire, and the connector.
  • J
    Janet MillerSep 14, 2025
    What causes outdoor heat exchanger temperature sensor 2 abnormality in a Panasonic CU-2S18NBU-1 Air Conditioner?
    • E
      Eric FreemanSep 14, 2025
      If your Panasonic Air Conditioner displays an outdoor heat exchanger temperature sensor 2 abnormality, it's likely due to an open or short circuit in the sensor. Check the outdoor heat exchanger temperature sensor 2 lead wire and connector.
  • A
    Alan SmithSep 12, 2025
    How to fix outdoor heat exchanger temperature sensor 1 abnormality on a Panasonic Air Conditioner?
    • N
      nkruegerSep 13, 2025
      If your Panasonic Air Conditioner displays an outdoor heat exchanger temperature sensor 1 abnormality, it's likely due to an open or short circuit in the sensor. Check the outdoor heat exchanger temperature sensor 1 lead wire and connector.
  • K
    Karl DeanSep 12, 2025
    What to do if my Panasonic Air Conditioner shows outdoor liquid pipe temperature sensor abnormality?
    • A
      Amber JonesSep 12, 2025
      If your Panasonic Air Conditioner displays an outdoor liquid pipe temperature sensor abnormality, it's likely due to an open or short circuit in the outdoor liquid pipe temperature sensor. Check the outdoor liquid pipe temperature sensor lead wire and connector.
  • J
    Jason RobinsonSep 9, 2025
    How do I fix an outdoor gas pipe temperature sensor abnormality in my Panasonic Air Conditioner?
    • M
      Maria StricklandSep 9, 2025
      If your Panasonic Air Conditioner displays an outdoor gas pipe temperature sensor abnormality, it's likely due to an open or short circuit in the outdoor gas pipe temperature sensor. Check the outdoor gas pipe temperature sensor lead wire and connector.
  • K
    kennedyericaSep 7, 2025
    What causes outdoor air temperature sensor abnormality in a Panasonic CU-2S18NBU-1?
    • J
      Joseph GreenSep 7, 2025
      If your Panasonic Air Conditioner displays an outdoor air temperature sensor abnormality, it's likely due to an open or short circuit in the outdoor air temperature sensor. Check the outdoor air temperature sensor lead wire and connector.
  • L
    Laura HernandezSep 5, 2025
    How to troubleshoot compressor temperature sensor abnormality on a Panasonic CU-2S18NBU-1?
    • K
      Kelly BakerSep 6, 2025
      If you're experiencing a compressor temperature sensor abnormality with your Panasonic Air Conditioner, the cause might be an open or short circuit in the compressor temperature sensor. Check the compressor temperature sensor lead wire and connector.
  • M
    Michelle StephensAug 20, 2025
    How to fix an outdoor fan motor mechanism lock on a Panasonic Air Conditioner?
    • A
      Anthony SmithAug 21, 2025
      If your Panasonic Air Conditioner displays an outdoor fan motor mechanism lock, this could be due to the outdoor fan motor being locked or having abnormal feedback. Check the outdoor fan motor lead wire and connector, and inspect for any fan motor lock or blockage.

Summary

Safety Precautions and Warnings

General Safety Warnings

Critical safety warnings and cautions for handling the equipment.

Prohibited Actions Symbols

Explanation of symbols indicating actions that must not be performed.

Specifications Overview

Unit Dimensions

Refrigeration Cycle Diagram

Block Diagram Explanation

Wiring Connection Diagram

Electronic Circuit Diagram

Printed Circuit Board Details

Main Printed Circuit Board

Details the layout and components of the main PCB.

Noise Filter Printed Circuit Board

Details the noise filter printed circuit board.

Installation Information

Installation Check Points

Key points to verify before and during installation.

Installation Instructions

Select Best Location

Guidance on choosing an optimal location for the outdoor unit.

Install Outdoor Unit

Steps for physically mounting and securing the outdoor unit.

Connect Piping

Instructions for connecting refrigerant pipes to the outdoor unit.

Evacuate Equipment

Procedure for removing air and moisture from the system.

Connect Cable to Outdoor Unit

Steps for wiring the outdoor unit to the power supply and indoor units.

Heat Insulation

Guidelines for applying heat insulation to refrigerant pipes.

Operation Control

Cooling Operation Modes

Details on cooling mode operations and controls.

Protection Controls

Freeze and Dew Prevention

Control logic for preventing freezing and dew formation during cooling.

Electronic Parts Temperature Rise Protection

Protection against electronic parts overheating during cooling/dry operation.

Cooling Overload & Timing Controls

Manages cooling overload, current, and restart timing.

IPM Protection Controls

Protection for IPM module against overheating and peak currents.

Compressor Protection

Protects compressor from gas leaks, high pressure, and valve issues.

Servicing Modes

Pump Down, Test, and Wiring Checks

Procedures for pump down, test operations, and wiring error checks.

Power Save and Mode Priority

Enables energy saving and mode prioritization functions.

Troubleshooting Guide

Self Diagnosis Function

Using self-diagnosis features to identify problems and locations.

Disassembly and Assembly

Outdoor Unit Removal Procedure

Steps for safely removing the outdoor unit components.

Technical Data

Operation Characteristics

Performance data and characteristics of the unit across various conditions.

Exploded View and Parts List

Panasonic CU-2S18NBU-1 Specifications

General IconGeneral
BrandPanasonic
ModelCU-2S18NBU-1
CategoryAir Conditioner
LanguageEnglish

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