Daikin RXYQ8U7Y1B - User Manual

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Installation and operation manual

VRV IV+ heat pump

English

Installation and operation manual

VRV IV+ heat pump

RYYQ8U7Y1B*

RYYQ10U7Y1B*

RYYQ12U7Y1B*

RYYQ14U7Y1B*

RYYQ16U7Y1B*

RYYQ18U7Y1B*

RYYQ20U7Y1B*

RYMQ8U7Y1B*

RYMQ10U7Y1B*

RYMQ12U7Y1B*

RYMQ14U7Y1B*

RYMQ16U7Y1B*

RYMQ18U7Y1B*

RYMQ20U7Y1B*

RXYQ8U7Y1B*

RXYQ10U7Y1B*

RXYQ12U7Y1B*

RXYQ14U7Y1B*

RXYQ16U7Y1B*

RXYQ18U7Y1B*

RXYQ20U7Y1B*

Table of Contents

Other manuals for Daikin RXYQ8U7Y1B

Service Manual200 pages

Questions and Answers

G
George ChaneyAug 10, 2025
Why is my Daikin RXYQ8U7Y1B Heat Pump system operating, but the cooling or heating is insufficient?
- L
  Luis MillerAug 10, 2025
  There are several potential reasons why your Daikin Heat Pump might be running but not cooling or heating effectively. Here are some things you can check: * Ensure that neither the air inlet nor the outlet of the outdoor or indoor unit is blocked by obstacles. Clear any obstructions to allow free airflow. * Make sure the air filter is clean. * Verify that the temperature setting is correct. * Confirm the fan speed setting is appropriate on your user interface. * Check for any open doors or windows and close them to prevent drafts. * Assess if there are too many people in the room or excessive heat sources. * See if direct sunlight is entering the room and use curtains or blinds to block it. * Ensure the airflow angle is properly adjusted.
O
Olivia WalkerAug 19, 2025
What to do if my Daikin RXYQ8U7Y1B Heat Pump system does not operate at all?
- R
  rcoxAug 19, 2025
  If your Daikin Heat Pump isn't operating, here are a couple of things you can check: * First, verify that there is no power failure and wait for the power to be restored. The system should restart automatically after power is restored. * Second, check if a fuse has blown or a breaker has been activated. If so, replace the fuse or reset the breaker.
V
Victoria MeyerAug 28, 2025
Why does my Daikin RXYQ8U7Y1B Heat Pump go into fan-only operation and then stop when heating or cooling is activated?
- D
  Dalton RoseAug 29, 2025
  If your Daikin Heat Pump switches to fan-only mode and then stops when heating or cooling is initiated, check the following: * Ensure that the air inlet or outlet of the outdoor or indoor unit is not blocked. Remove any obstructions to allow free air flow. * Check if the user interface displays a message indicating it's time to clean the air filter.

Summary

Specific installer safety instructions

Installer Safety Precautions and Warnings

Essential safety guidelines, warnings, and precautions for installers.

User safety instructions

General User Safety Guidelines

General safety warnings and user responsibilities.

Safe Operation Instructions and Precautions

Guidelines for safe appliance operation and user precautions.

Operation

Operating the System Basics

System Operation Modes Details

Heating Operation Specifics

Maintenance and service

Refrigerant Information and Safety

Troubleshooting

Service, Warranty, and Maintenance Information

Troubleshooting Overview and Error Codes

General troubleshooting steps and error code interpretation.

Hand-over to the user

User Hand-over Procedures and Training

Troubleshooting

Solving Problems Based on Error Codes

How to address problems using the error code table.

Error Codes Overview and Interpretation

Summary of main and sub error codes and their causes.

Troubleshooting: Malfunctions and Solutions Table

Detailed table of malfunctions and corresponding solutions.

Troubleshooting: Wiring and Unit Combination Issues

Troubleshooting for wiring and unit compatibility problems.

Unit installation

Installation Site Requirements

Guidelines for selecting an appropriate installation site.

Outdoor Unit Mounting Structure Instructions

Instructions for mounting the outdoor unit and providing installation structure.

Piping installation

Refrigerant Piping Requirements and Standards

Essential requirements for refrigerant piping installation.

Piping Size Selection Guide

Guidance on selecting appropriate piping sizes.

Piping Size Selection and Branch Kits Details

Further details on selecting piping sizes and branch kits.

Multiple Outdoor Unit Piping Layouts

Connecting Refrigerant Piping Steps

Connecting Refrigerant Piping (Continued)

Using Stop Valves and Service Ports

Handling Stop Valves and Service Ports (Detailed)

Checking Refrigerant Piping Integrity

Steps for checking refrigerant piping integrity.

Leak Test and Vacuum Drying Procedures

Procedures for performing leak tests and vacuum drying.

Performing Leak Tests (Vacuum and Pressure)

Detailed steps for vacuum and pressure leak tests.

Performing Vacuum Drying Process

Procedure to remove moisture from the system.

14.4 Charging refrigerant

Procedures for charging refrigerant into the system.

Refrigerant Charging Precautions and Safety

Important safety precautions before charging refrigerant.

Determining Additional Refrigerant Amount

How to calculate the required additional refrigerant amount.

Refrigerant Charging Flow Chart

Automatic and Manual Charging Procedures

Pre-charging Refrigerant Steps

Automatic Refrigerant Charging Details and Limits

Manual Refrigerant Charging Process

Refrigerant Charging Error Codes and Solutions

Common error codes and their solutions during charging.

Post-Charging Checks and Labeling

Electrical installation

Electrical Compliance and Safety Devices

Compliance standards and requirements for safety devices.

Wiring and Fuse Capacity Calculations

Connecting Transmission Wiring to PCBs

Connecting Power Supply Procedure

Configuration

Checking Compressor Insulation Resistance

Making Field Settings Overview

Overview of field settings and PC configurator usage.

Accessing Field Setting Components and Modes

Using Mode 1: Monitoring Settings

Using Mode 2: Field Settings

How to use Mode 2 for changing field settings.

Mode 2 Field Settings Details

Field Settings: Temperatures and Height Differences

Field Settings: Refrigerant Charge and Master Interface

Commissioning

Leak Detection Function Usage

Commissioning Checklist and Precautions

Checklist of items to verify and precautions before commissioning.

Precautions Before Commissioning Tests

About the System Test Run

Information and procedure for conducting the system test run.

Performing a System Test Run

Step-by-step guide to perform the system test run.

Technical data

Outdoor Unit Piping Diagrams

Daikin RXYQ8U7Y1B Specifications

General

Model	RXYQ8U7Y1B
Category	Heat Pump
Cooling Capacity	8.0 kW
Refrigerant	R-32
Power Supply	50Hz
Noise Level (Outdoor Unit)	56 dB

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