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Daikin FTYN20CVMB9 - User Manual

Daikin FTYN20CVMB9
246 pages
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Ser vice
Manual
Inverter Pair
Wall Mounted Type C-Series
D-Series
[Applied Models]
zInverter Pair : Cooling Only
zInverter Pair : Heat Pump
SiENBE04-401A

Table of Contents

Questions and Answers

  • S
    Susan WilsonAug 19, 2025
    Why is my Daikin FTYN20CVMB9 Air Conditioner outdoor unit leaking water?
    • K
      Kristen AllenAug 19, 2025
      In HEAT mode, the frost on the outdoor unit melts into water or steam during defrost operation. In COOL or DRY mode, moisture in the air condenses into water on the cool surface of the outdoor unit piping and drips.
  • T
    Tracy LeeAug 21, 2025
    Why does my Daikin FTYN20CVMB9 smell?
    • R
      Rebecca MorrisonAug 21, 2025
      The Daikin Air Conditioner may emit odors because smells from the room, furniture, or cigarettes have been absorbed into the unit and are being discharged with the airflow. It is recommended to have the indoor unit cleaned by a technician. Consult the service shop where you bought the air conditioner.
  • M
    Mr. Anthony CarsonAug 23, 2025
    What to do if my Daikin FTYN20CVMB9 Air Conditioner heating stops suddenly?
    • M
      Maria HillAug 23, 2025
      The system is likely removing frost from the outdoor unit. You should wait for about 3 to 8 minutes.
  • W
    Wesley BirdAug 26, 2025
    Why doesn't hot air come out immediately from my Daikin Air Conditioner when heating?
    • J
      Joshua JonesAug 27, 2025
      You should wait for 1 to 4 minutes. The system is designed to start discharging air only after it has reached a certain temperature.
  • S
    Sabrina MorenoAug 28, 2025
    Why is the cooling or heating effect poor in my Daikin Air Conditioner?
    • B
      Bill CampbellAug 28, 2025
      If your Daikin Air Conditioner isn't cooling or heating well, check these: * Ensure the air filters are clean. * Remove any obstructions blocking the air inlet or outlet of the indoor and outdoor units. * Verify the temperature setting is correct. * Make sure all windows and doors are closed. * Confirm the airflow rate and direction are appropriately set. * Check if the unit is set to INTELLIGENT EYE mode.
  • W
    wendy69Aug 30, 2025
    What to do if my Daikin Air Conditioner's heating stops suddenly and I hear a flowing sound?
    • C
      Cesar MoranAug 30, 2025
      If the heating operation of your Daikin Air Conditioner stops suddenly and you hear a flowing sound, wait for about 3 to 8 minutes.
  • G
    Gregory TranSep 1, 2025
    Why my Daikin FTYN20CVMB9 Air Conditioner does not start immediately?
    • C
      Christopher BishopSep 1, 2025
      If the ON/OFF button was pressed soon after operation was stopped, or if the mode was reselected, you should wait for about 3 minutes.
  • S
    Sara GriffinSep 3, 2025
    What to do if my Daikin FTYN20CVMB9 operation stopped suddenly?
    • M
      mooreelizabethSep 3, 2025
      For system protection, the air conditioner may stop operating due to a sudden large voltage fluctuation. It will automatically resume operation in about 3 minutes.
  • D
    davidcarterSep 5, 2025
    Why is the Daikin FTYN20CVMB9 Air Conditioner outdoor fan running when it's off?
    • J
      James LopezSep 5, 2025
      After operation is stopped, the outdoor fan may continue rotating for another 60 seconds for system protection. Also, when the outdoor temperature is very high, the outdoor fan might start rotating for system protection even when the air conditioner is not in operation.
  • S
    Sara SpencerSep 7, 2025
    Why does mist come out of my Daikin Air Conditioner?
    • D
      Danny BakerSep 7, 2025
      This happens when the air in the room is cooled into mist by the cold air flow during cooling operation.

Summary

Service Manual

Product Series Identification

Identifies the product series and type.

Applied Air Conditioner Models

Lists the available model types for cooling and heating.

Part 1 List of Functions

Comprehensive Function List

Lists all available functions for the air conditioner models.

High Grade Model Functions

Details functions specific to high-grade models.

Standard Grade Model Functions

Details functions specific to standard-grade models.

Non-Inverter Model Functions

Details functions specific to non-inverter models.

Part 2 Specifications

General Unit Specifications

Provides an overview of the technical specifications for the units.

Cooling Only Specifications

Details specifications for cooling-only operation.

Heat Pump Specifications

Details specifications for heat pump operation.

Part 4 Function and Control

Core Operational Functions

Explains the primary operational functions of the air conditioner.

Frequency Control Principle

Explains the inverter's frequency control principle.

Airflow Management Features

Describes airflow control features like flaps and louvers.

Indoor Unit Fan Speed Control

Details how fan speed is controlled for indoor units.

Programme Dry Function Operation

Explains the function for humidity removal.

Automatic Operation Mode

Describes the automatic mode for cooling/heating.

NIGHT SET Mode Functionality

Explains the night-time energy-saving mode.

INTELLIGENT EYE Sensor Operation

Describes the sensor for detecting human presence.

HOME LEAVE Operation Function

Explains the function for remote home operation.

Inverter POWERFUL Operation Mode

Details the mode for maximizing cooling/heating capacity.

Main Structural Part Functions

Explains the roles of key structural components.

Thermistor Component Functionality

Details the function of thermistors in the system.

Operational Control Specifications

Outlines the control specifications for various operations.

Operating Mode Hierarchy

Describes the hierarchy of operating modes.

Inverter Frequency Control Logic

Explains how frequency is controlled for the inverter.

Mode Change and Start-up Controls

Details controls during mode changes and startup.

Discharge Pipe Temperature Regulation

Explains control based on discharge pipe temperature.

Input Current Control for Protection

Details control based on input current for protection.

Freeze-up Protection Control Mechanism

Explains the control to prevent freezing.

Heating Peak Load Management Control

Describes control for managing peak heating load.

Fan Operation Control Logic

Details the priority and logic for fan control.

Compressor Protection Functionality

Explains a protection function for the compressor.

Defrost Control Procedure

Details the defrost control process.

Electronic Expansion Valve Control

Explains the control of the electronic expansion valve.

System Malfunction Identification

Lists and explains system malfunctions.

Forced Operation Mode Details

Details the forced cooling operation mode.

Facility Setting Jumper for Low-Temp Cooling

Explains jumper settings for low-temperature cooling.

Part 6 Service Diagnosis

Diagnostic Safety Precautions

Provides cautions to follow before starting diagnostic procedures.

Problem Symptoms and Resolution Measures

Lists symptoms and corresponding measures for troubleshooting.

Service Check Functionality

Explains how to use the service check function.

Troubleshooting Guide

Provides a comprehensive troubleshooting guide.

Error Codes and Descriptions

Lists and describes error codes indicated on the remote.

Indoor Unit PCB Malfunction Diagnosis

Details troubleshooting steps for indoor unit PCB issues.

Freeze-up or High Pressure Control Troubleshooting

Explains troubleshooting for freeze-up or high-pressure conditions.

Fan Motor Abnormality Troubleshooting

Details troubleshooting for fan motor issues.

Indoor Unit Thermistor Abnormality Diagnosis

Details troubleshooting for indoor unit thermistor issues.

Signal Transmission Error Troubleshooting

Explains troubleshooting for communication errors.

Compressor Overload Troubleshooting

Details troubleshooting for compressor overload.

Compressor Lock Troubleshooting Steps

Details troubleshooting for compressor lock issues.

DC Fan Lock Troubleshooting

Details troubleshooting for DC fan motor lock.

Input Over Current Detection Troubleshooting

Details troubleshooting for input over-current.

Four Way Valve Abnormality Troubleshooting

Details troubleshooting for four-way valve issues.

Discharge Pipe Temperature Control Troubleshooting

Details troubleshooting for discharge pipe temperature control.

High Pressure Control in Cooling Troubleshooting

Details troubleshooting for high pressure in cooling.

Position Sensor Abnormality Diagnosis

Details troubleshooting for position sensor abnormalities.

DC Sensor Abnormality Troubleshooting

Details troubleshooting for DC sensor abnormalities.

Outdoor Unit Thermistor Abnormality Diagnosis

Details troubleshooting for outdoor unit thermistor issues.

Electrical Box Temperature Rise Troubleshooting

Details troubleshooting for electrical box temperature rise.

Radiation Fin Temperature Rise Troubleshooting

Details troubleshooting for radiation fin temperature rise.

Output Over Current Detection Troubleshooting

Details troubleshooting for output over-current.

Insufficient Gas Troubleshooting Guide

Details troubleshooting for insufficient gas conditions.

Over-voltage Detection Troubleshooting

Details troubleshooting for over-voltage detection.

Diagnostic Checks Procedure

Outlines specific checks to perform for diagnosis.

How to Perform Diagnostic Checks

Provides a guide on how to perform diagnostic checks.

Electronic Expansion Valve Check Procedure

Details the procedure for checking the electronic expansion valve.

Four Way Valve Performance Check Procedure

Details how to check the four-way valve performance.

Thermistor Resistance Check Procedure

Details how to check thermistor resistance.

Installation Condition Check Procedure

Details how to check installation conditions.

Discharge Pressure Check Procedure

Details how to check discharge pressure.

Outdoor Unit Fan System Check Procedure

Details how to check the outdoor unit fan system.

Power Supply Waveforms Check Procedure

Details how to check power supply waveforms.

Inverter Units Refrigerant System Check

Details how to check the inverter units refrigerant system.

Power Transistor Check Procedure

Details how to check the power transistor.

Outdoor PCB Speed Pulse Input Check

Details checking speed pulse input on the outdoor PCB.

Hall IC Check Procedure

Details the procedure for checking the Hall IC.

Part 7 Removal Procedure

Indoor Unit Disassembly

Provides steps for disassembling the indoor unit components.

Air Filter Removal Procedure

Details the procedure for removing the air filter.

Front Grille Removal Procedure

Details the procedure for removing the front grille.

Airflow Blade Removal Procedure

Details removing airflow direction blades.

Electrical Box, PCB, and Swing Motor Removal

Details removing electrical components and motors.

Heat Exchanger Removal Procedure

Details the procedure for removing the heat exchanger.

Fan Rotor and Fan Motor Removal

Details removing the fan rotor and motor.

Outdoor Unit RK(X)S-C, ARK(X)S-C Disassembly

Provides steps for disassembling outdoor unit models RK(X)S-C, ARK(X)S-C.

Outdoor Unit Panel and Fan Motor Removal

Details removing outdoor unit panels and fan motor.

Outdoor Electrical Box Removal

Details removing the outdoor electrical box.

Reactor and Partition Plate Removal

Details removing reactor and partition plate.

Four Way Valve Removal Procedure

Details removing the four-way valve.

Compressor Removal Procedure

Details removing the compressor.

PCB Removal Procedure

Details removing the printed circuit board.

Outdoor Unit RK(X)H-C, ARK(X)H-C, R(Y)N-C Disassembly

Provides steps for disassembling outdoor unit models RK(X)H-C, ARK(X)H-C, R(Y)N-C.

External Panel Removal Procedure

Details removing external panels of the outdoor unit.

Bell Mouth Removal Procedure

Details removing the bell mouth.

PCB and Electrical Box Removal

Details removing PCB and electrical box.

Propeller Fan and Fan Motor Removal

Details removing propeller fan and fan motor.

Partition Plate and Reactor Removal

Details removing partition plate and reactor.

Expansion Valve and Four Way Valve Removal

Details removing expansion valve and four-way valve.

Compressor Removal from Outdoor Unit

Details removing the compressor.

Part 8 Miscellaneous Topics

General Miscellaneous Information

Covers miscellaneous topics not fitting other categories.

Remote Control Trial Operation

Explains how to perform a test run using the remote control.

Jumper Setting Configurations

Details jumper settings for various functions.

Part 9 Appendix

Refrigerant Piping Diagrams

Provides diagrams illustrating refrigerant piping.

Indoor Unit Piping Diagrams

Shows piping diagrams for indoor units.

Outdoor Unit Piping Diagrams

Shows piping diagrams for outdoor units.

Electrical Wiring Diagrams

Provides diagrams illustrating electrical wiring.

Indoor Unit Wiring Diagrams

Shows wiring diagrams for indoor units.

Outdoor Unit Wiring Diagrams

Shows wiring diagrams for outdoor units.

Daikin FTYN20CVMB9 Specifications

General IconGeneral
BrandDaikin
ModelFTYN20CVMB9
CategoryAir Conditioner
LanguageEnglish

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