Daikin VRV IV User Manual (English)

Other manuals for Daikin VRV IV

Questions and Answers:

R
Rebecca SpenceJul 25, 2025
Why is my Daikin Air Conditioner not cooling or heating enough?
- C
  Christine MeyersJul 25, 2025
  Insufficient cooling or heating can occur for several reasons. Make sure that the air inlet or outlet of the outdoor or indoor unit is not blocked by obstacles, and remove any obstructions to ensure free airflow. Also, check if the air filter is clogged. Verify the temperature and fan speed settings on the user interface. Ensure doors and windows are closed to prevent drafts. Consider if there are too many people in the room or excessive heat sources. Direct sunlight can also affect performance, so use curtains or blinds. Lastly, check if the airflow angle is properly adjusted.
P
Patrick PierceAug 2, 2025
What to do if my Daikin VRV IV Air Conditioner does not turn on?
- N
  Nicholas JimenezAug 2, 2025
  First, check if there is a power failure and wait until power is restored. Note that if a power failure occurs during operation, the system will automatically restart immediately after power is restored. Next, check if a fuse has blown or a breaker is activated. If necessary, change the fuse or reset the breaker.
Y
ysilvaAug 9, 2025
Why does my Daikin VRV IV Air Conditioner only blow air and stop when set to cool or heat?
- M
  melendezkimberlyAug 9, 2025
  This issue can occur if the air inlet or outlet of the outdoor or indoor unit is blocked by obstacles. Remove any obstacles to ensure free airflow. Additionally, check if the user interface display indicates it's time to clean the air filter.
E
evanskathrynAug 17, 2025
What to do if my Daikin VRV IV displays a malfunction code?
- C
  Christopher PayneAug 17, 2025
  Notify your installer and report the malfunction code.

Daikin VRV IV Specifications

General

Type	Variable Refrigerant Volume (VRV)
Series	VRV IV
Refrigerant	R410A
Energy Efficiency	High
Operating Temperature Range (Cooling)	-5°C to 46°C
Operating Temperature Range (Heating)	-20°C to 15.5°C
Installation	Professional installation required
Control	Centralized control system
Indoor Unit Options	Various types including ceiling cassette, wall-mounted, ducted, and floor-standing
Power Supply	380-415V, 3-phase, 50Hz

Summary

1 About the Documentation

1.1 About this document

Provides an overview of the manual's purpose, scope, and target audience.

1.2 Meaning of warnings and symbols

Explains the different warning symbols and their significance for safety.

2 General Safety Precautions

2.1 For the Installer

Safety measures and precautions specifically for installation personnel.

2.1.1 General

Basic safety advice applicable to all installer tasks and general warnings.

2.1.2 Installation Site

Guidelines for selecting a safe and suitable location for unit installation.

2.1.3 Refrigerant — In Case of R410A or R32

Safety precautions related to handling R410A or R32 refrigerants.

2.1.4 Electrical

Critical safety measures concerning electrical work during installation.

3 Specific Installer Safety Instructions

4 User Safety Instructions

4.1 General

General safety guidelines and warnings for the end-user.

4.2 Instructions for Safe Operation

Guidance on operating the system safely and avoiding hazards.

5 About the System

5.1 System Layout

Diagram and explanation of how system components are connected.

6 User Interface

7 Before Operation

8 Operation

8.1 Operation Range

Defines the environmental conditions for safe and effective system operation.

8.2 Operating the System

Instructions on how to start, run, and control the system.

8.2.1 About Operating the System

General information regarding system operation procedures.

8.2.2 About Cooling, Heating, Fan Only, and Automatic Operation

Explains the different operational modes available for the system.

8.2.3 About the Heating Operation

Specific details and considerations for heating mode.

8.2.4 To Operate the System (WITHOUT Cool/Heat Changeover Remote Control Switch)

Operation steps when no changeover switch is present.

8.2.5 To Operate the System (WITH Cool/Heat Changeover Remote Control Switch)

Operation steps when a changeover switch is installed.

8.3 Using the Dry Program

Instructions on how to use the dehumidification (dry) mode.

8.3.1 About the Dry Program

Explanation of the dry program's function and operation.

8.3.2 To Use the Dry Program (WITHOUT Cool/Heat Changeover Remote Control Switch)

Using dry mode without a changeover switch.

8.3.3 To Use the Dry Program (WITH Cool/Heat Changeover Remote Control Switch)

Using dry mode with a changeover switch.

8.4 Adjusting the Air Flow Direction

How to control and adjust the direction of air flow.

8.4.1 About the Air Flow Flap

Details on the function and adjustment of the air flow flap.

8.5 Setting the Master User Interface

Procedures for setting up the primary user interface for system control.

8.5.1 About Setting the Master User Interface

General information on designating a master user interface.

8.5.2 To Designate the Master User Interface (VRV DX and Hydrobox)

Specific master interface designation for VRV DX and Hydrobox units.

8.6 About Control Systems

Explanation of different system control configurations.

9 Energy Saving and Optimum Operation

9.1 Available Main Operation Methods

Describes different operating modes to enhance energy efficiency.

9.2 Available Comfort Settings

Options for adjusting comfort levels and energy consumption.

10 Maintenance and Service

10.1 Maintenance After a Long Stop Period

Procedures for unit maintenance after extended periods of non-use.

10.2 Maintenance Before a Long Stop Period

Steps to prepare the unit for a long period of inactivity.

10.3 About the Refrigerant

Information regarding the refrigerant type and its properties.

10.4 After-sales Service and Warranty

Details concerning service, repairs, and warranty coverage.

10.4.1 Warranty Period

Information about the duration and terms of the product warranty.

10.4.2 Recommended Maintenance and Inspection

Recommendations for regular maintenance and inspection tasks.

10.4.3 Recommended Maintenance and Inspection Cycles

Schedule outlining recommended intervals for maintenance and inspection.

10.4.4 Shortened Maintenance and Replacement Cycles

Factors that may require shorter maintenance or replacement intervals.

11 Troubleshooting

11.1 Error Codes: Overview

Explanation of error codes displayed by the system and their meanings.

11.2 Symptoms That Are NOT System Malfunctions

Common symptoms that do not indicate actual system malfunctions.

11.2.1 Symptom: The System Does Not Operate

Troubleshooting steps when the system fails to start.

11.2.2 Symptom: Cool/Heat Cannot Be Changed Over

Addressing issues with switching between cooling and heating modes.

11.2.3 Symptom: Fan Operation Is Possible, But Cooling and Heating Do Not Work

Troubleshooting when fan operates but temperature control fails.

11.2.4 Symptom: The Fan Speed Does Not Correspond to the Setting

Resolving fan speed discrepancies with control settings.

11.2.5 Symptom: The Fan Direction Does Not Correspond to the Setting

Addressing issues with the fan direction control.

11.2.6 Symptom: White Mist Comes Out of a Unit (Indoor Unit)

Explanation for white mist appearing from the indoor unit.

11.2.7 Symptom: White Mist Comes Out of a Unit (Indoor Unit, Outdoor Unit)

Explanation for white mist appearing from both indoor and outdoor units.

11.2.8 Symptom: The User Interface Reads "U4" or "U5" and Stops, But Then Restarts After a Few Minutes

Troubleshooting UI error codes U4/U5 and intermittent restarts.

11.2.9 Symptom: Noise of Air Conditioners (Indoor Unit)

Identifying common noises originating from the indoor unit.

11.2.10 Symptom: Noise of Air Conditioners (Indoor Unit, Outdoor Unit)

Identifying common noises originating from both indoor and outdoor units.

11.2.11 Symptom: Noise of Air Conditioners (Outdoor Unit)

Identifying common noises originating from the outdoor unit.

11.2.12 Symptom: Dust Comes Out of the Unit

Explanation for dust emission from the unit, especially when first used.

11.2.13 Symptom: The Units Can Give Off Odours

Explains the potential causes of odors emitted by the units.

11.2.14 Symptom: The Outdoor Unit Fan Does Not Spin

Troubleshooting when the outdoor unit fan fails to operate.

11.2.15 Symptom: The Display Shows "88"

Meaning of the "88" display code, typically seen after power-on.

11.2.16 Symptom: The Compressor in the Outdoor Unit Does Not Stop After a Short Heating Operation

Addressing the compressor staying active after heating operation.

11.2.17 Symptom: The Inside of an Outdoor Unit Is Warm Even When the Unit Has Stopped

Explanation for a warm outdoor unit when it is not operating.

11.2.18 Symptom: Hot Air Can Be Felt When the Indoor Unit Is Stopped

Explains why warm air might be felt from an indoor unit when stopped.

12 Relocation

13 Disposal

14 Technical Data

14.1 Information Requirements for Eco Design

Instructions on how to access energy efficiency and eco design data.

15 About the Box

15.1 About LOOP BY DAIKIN

Information on Daikin's refrigerant circular economy initiative.

15.2 Overview: About the Box

What to do after the outdoor unit box is delivered on-site.

15.3 To Unpack the Outdoor Unit

Steps for safely removing packaging materials from the outdoor unit.

15.4 To Remove the Accessories From the Outdoor Unit

Procedure to access and remove accessories packed with the unit.

15.5 Accessory Pipes: Diameters

Specifications for the diameters of accessory piping.

15.6 To Remove the Transportation Stay

Instructions for removing transit protection before installation.

16 About the Units and Options

16.1 Overview: About the Units and Options

Introduction to the different units and available options.

16.2 Identification Label: Outdoor Unit

How to read and interpret the outdoor unit's identification label.

16.3 About the Outdoor Unit

Details on the outdoor unit models, their specifications and capabilities.

16.4 System Layout

Diagram illustrating the system configuration and component connections.

16.5 Combining Units and Options

Information on allowed combinations of indoor and outdoor units and options.

16.5.1 About Combining Units and Options

General guidelines and rules for combining system components.

16.5.2 Possible Combinations of Indoor Units

Lists the compatible indoor units for various system configurations.

16.5.3 Possible Combinations of Outdoor Units

Lists the compatible outdoor unit configurations.

16.5.4 Possible Options for the Outdoor Unit

Details on available optional accessories for the outdoor unit.

17 Unit Installation

17.1 Preparing the Installation Site

Site selection criteria and preparation steps for outdoor unit installation.

17.1.1 Installation Site Requirements of the Outdoor Unit

Specific requirements for the outdoor unit's installation location.

17.1.2 Additional Installation Site Requirements of the Outdoor Unit in Cold Climates

Special installation considerations for cold weather environments.

17.1.3 Securing Safety Against Refrigerant Leaks

Measures and precautions to ensure safety concerning refrigerant leaks.

17.2 Opening the Unit

Procedures for safely opening unit panels to access internal components.

17.2.1 About Opening the Units

General guidance on accessing the unit's interior.

17.2.2 To Open the Outdoor Unit

Specific steps for opening the outdoor unit.

17.2.3 To Open the Electrical Component Box of the Outdoor Unit

Procedure to access the electrical component compartment.

17.3 Mounting the Outdoor Unit

Instructions for securely mounting the outdoor unit in place.

17.3.1 To Provide the Installation Structure

Details on creating the necessary structural support for unit mounting.

18 Piping Installation

18.1 Preparing Refrigerant Piping

Initial steps and requirements for preparing refrigerant piping.

18.1.1 Refrigerant Piping Requirements

Standards for refrigerant piping materials, cleanliness, and tightness.

18.1.2 Refrigerant Piping Insulation

Guidelines for selecting and applying insulation for refrigerant pipes.

18.1.3 To Select the Piping Size

Methods for determining the correct pipe sizes based on capacity.

18.1.4 To Select Refrigerant Branch Kits

Guidance on choosing the appropriate refrigerant branch kits.

18.1.5 About the Piping Length

Rules and limitations for pipe lengths and level differences.

18.1.6 Piping Length: VRV DX Only

Specific piping length limitations for VRV DX systems.

18.1.7 Piping Length: VRV DX and Hydrobox

Piping length limitations for systems combining VRV DX and Hydrobox units.

18.1.8 Piping Length: VRV DX and RA DX

Piping length limitations for systems combining VRV DX and RA DX units.

18.1.9 Multiple Outdoor Units: Possible Layouts

Configurations and piping layouts for systems with multiple outdoor units.

18.2 Connecting the Refrigerant Piping

Step-by-step procedures for connecting refrigerant pipes.

18.2.1 About Connecting the Refrigerant Piping

General information and considerations before connecting refrigerant pipes.

18.2.2 Precautions When Connecting the Refrigerant Piping

Safety measures and precautions during refrigerant pipe connection.

18.2.3 Multiple Outdoor Units: Knockout Holes

Procedure for removing knockout holes for connections on multiple units.

18.2.4 To Route the Refrigerant Piping

Guidelines for routing refrigerant piping to connection points.

18.2.5 To Connect the Refrigerant Piping to the Outdoor Unit

Final steps for connecting refrigerant piping to the outdoor unit.

18.2.6 To Connect the Multi Connection Piping Kit

Instructions for connecting multi connection piping kits.

18.2.7 To Connect the Refrigerant Branching Kit

Procedures for connecting refrigerant branching kits.

18.2.8 To Protect Against Contamination

Methods to prevent dirt, liquid, or dust from entering piping.

18.2.9 To Braze the Pipe End

Techniques and precautions for brazing pipe ends.

18.2.10 Using the Stop Valve and Service Port

How to properly operate stop valves and service ports.

18.2.11 To Remove the Spun Pipes

Procedure for safely removing spun pipe sections.

18.3 Checking the Refrigerant Piping

Procedures for verifying the integrity of the refrigerant piping.

18.3.1 About Checking the Refrigerant Piping

General overview and importance of checking refrigerant piping.

18.3.2 Checking Refrigerant Piping: General Guidelines

Best practices and guidelines for inspecting refrigerant piping.

18.3.3 Checking Refrigerant Piping: Setup

Steps and equipment required for setting up refrigerant piping checks.

18.3.4 To Perform a Leak Test

Methods and procedures for conducting refrigerant leak tests.

18.3.5 To Perform Vacuum Drying

Process for removing moisture and air from the refrigerant piping.

18.3.6 To Insulate the Refrigerant Piping

Guidelines for proper insulation of refrigerant piping.

18.4 Charging Refrigerant

Procedures and precautions for adding refrigerant to the system.

18.4.1 Precautions When Charging Refrigerant

Essential safety measures to follow during refrigerant charging.

18.4.2 About Charging Refrigerant

General information on the refrigerant charging process.

18.4.3 To Determine the Additional Refrigerant Amount

Method for calculating the amount of refrigerant to be added.

18.4.4 To Charge Refrigerant: Flow Chart

Visual guide outlining the steps for refrigerant charging.

18.4.5 To Charge Refrigerant

Detailed steps for performing refrigerant charging.

18.4.6 Step 6: To Manually Charge Refrigerant

Procedure for manually charging the system with refrigerant.

18.4.7 Checks After Charging Refrigerant

Verification steps to perform after refrigerant has been charged.

18.4.8 To Fix the Fluorinated Greenhouse Gases Label

Instructions for correctly applying the refrigerant labeling.

19 Electrical Installation

19.1 About Connecting the Electrical Wiring

Fundamental procedures and considerations for electrical wiring.

19.1.1 Precautions When Connecting the Electrical Wiring

Essential safety measures during electrical wiring connections.

19.1.2 Field Wiring: Overview

Summary of external wiring requirements and components.

19.1.3 About the Electrical Wiring

General information and best practices for electrical wiring.

19.1.4 Guidelines When Knocking Out Knockout Holes

Procedures for creating and preparing wire entry points (knockout holes).

19.1.5 About Electrical Compliance

Information on electrical standards and compliance requirements.

19.1.6 Safety Device Requirements

Mandatory protective devices for electrical circuits.

19.2 To Route and Fix the Transmission Wiring

How to lay out and secure transmission wiring within the unit.

19.3 To Connect the Transmission Wiring

Steps for connecting transmission wiring to the unit's PCB.

19.4 To Finish the Transmission Wiring

Finalizing the installation of transmission wiring.

19.5 To Route and Fix the Power Supply

How to lay out and secure the main power supply cables.

19.6 To Connect the Power Supply

Steps for connecting the main power supply to the unit.

19.7 To Check the Insulation Resistance of the Compressor

Procedure for testing the compressor's insulation resistance.

20 Configuration

20.1 Overview: Configuration

Introduction to the system configuration process.

20.2 Making Field Settings

Process of configuring system parameters after installation.

20.2.1 About Making Field Settings

General information on how to perform field settings.

20.2.2 Field Setting Components

Identification of the physical controls used for field settings.

20.2.3 To Access the Field Setting Components

Steps to gain access to the setting controls on the unit.

20.2.4 To Access Mode 1 or 2

How to switch between monitoring and field setting modes.

20.2.5 To Use Mode 1

Instructions for operating the system in monitoring mode.

20.2.6 To Use Mode 2

Instructions for operating the system in field setting mode.

20.2.7 Mode 1: Monitoring Settings

Details on parameters and status that can be monitored.

20.2.8 Mode 2: Field Settings

Detailed explanation of available field settings and their values.

20.2.9 To Connect the PC Configurator to the Outdoor Unit

Procedure for connecting a PC to the unit for configuration.

20.3 Energy Saving and Optimum Operation

Methods to optimize system performance for energy efficiency and comfort.

20.3.1 Available Main Operation Methods

Describes different operational strategies for energy saving.

20.3.2 Available Comfort Settings

Options for adjusting comfort levels, balancing with energy use.

20.3.3 Example: Automatic Mode During Cooling

Illustrates automatic mode operation behavior during cooling.

20.3.4 Example: Automatic Mode During Heating

Illustrates automatic mode operation behavior during heating.

21 Commissioning

21.1 Overview: Commissioning

Introduction to the system verification and testing process.

21.2 Precautions When Commissioning

Essential safety guidelines to follow during commissioning.

21.3 Checklist Before Commissioning

A checklist of tasks to complete before starting system verification.

21.4 About the Test Run

Explanation of the system test run procedure and objectives.

21.5 To Perform a Test Run

Step-by-step guide for executing the system test run.

21.6 Correcting After Abnormal Completion of the Test Run

Procedures for resolving issues identified during the test run.

21.7 Operating the Unit

Final steps to start system operation after commissioning.

22 Hand-over to the User

23 Maintenance and Service

23.1 Maintenance Safety Precautions

Safety rules and precautions for performing maintenance tasks.

23.1.1 To Prevent Electrical Hazards

Specific safety measures to prevent electrical hazards during maintenance.

23.2 About Service Mode Operation

How to utilize special service modes for maintenance.

23.2.1 To Use Vacuum Mode

Procedure for operating the unit in vacuum mode for service.

23.2.2 To Recover Refrigerant

Steps for safely recovering refrigerant from the system.

24 Troubleshooting

24.1 Solving Problems Based on Error Codes

Guidance on resolving issues indicated by system error codes.

24.2 Error Codes: Overview

A comprehensive list and explanation of system error codes.

25 Disposal

26 Technical Data

26.1 Service Space: Outdoor Unit

Required clearances around the outdoor unit for servicing.

26.2 Piping Diagram: Outdoor Unit

Schematic diagram illustrating the outdoor unit's piping.

26.3 Wiring Diagram: Outdoor Unit

Schematic diagram showing the outdoor unit's electrical connections.

27 Glossary

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