Daikin REYQ-TA Series User Manual

Daikin REYQ-TA Series

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Service

Manual

SiUS371614E

REYQ72-456TAYDU

REYQ72-456TATJU

Heat Recovery 60 Hz

Table of Contents

Questions and Answers:

H
hmillerAug 3, 2025
Why is my Daikin REYQ-TA not cooling or heating air well?
- E
  Elizabeth HuntAug 3, 2025
  If your Daikin Heat Pump isn't cooling or heating air effectively, check for these potential causes: * Obstructions blocking the air inlet or outlet of either the indoor or outdoor unit. Remove any obstacles. * Clogged air filters. Clean the air filters. * An enclosed outdoor unit. Remove the enclosure. * Improper temperature settings. Adjust the temperature to a suitable level. * Low airflow rate. Increase it to a proper setting. * Incorrect air diffusion direction. Adjust it to the correct direction. * Open windows or doors. Ensure they are tightly shut. * Direct sunlight exposure. Use curtains or shades on windows. * Too many people in the room. Ensure the model is appropriate for the air conditioning load.
L
logan44Aug 8, 2025
Why does my Daikin REYQ-TA Heat Pump make intermittent stops?
- I
  ichenAug 9, 2025
  If your Daikin Heat Pump system makes intermittent stops, it could be due to electrical noises from other equipment interfering with communication between the units. Try to eliminate the sources of electrical noise. Once these causes are removed, the system should automatically restart.
A
Andrew ValentineAug 15, 2025
How to fix a Daikin REYQ-TA that does not start at all?
- K
  Kimberly TaylorAug 15, 2025
  If your Daikin Heat Pump system isn't starting, consider the following: * Blown fuse(s): Turn off the power supply and replace the fuse(s). * Tripped breaker(s): If a breaker knob is in the OFF position, turn the power supply ON. If a breaker knob is tripped, do not turn the power supply ON. * Power failure: After the power is restored, restart the system. * Loose or unplugged connector: Turn off the power supply to verify the connector's connection.
C
cindy76Aug 21, 2025
What to do if Daikin REYQ-TA Heat Pump does not cool air well?
- C
  csummersAug 21, 2025
  If your Daikin Heat Pump isn't cooling air effectively, it might be in dry operation. Change the system to cooling operation.
S
Samantha KingAug 27, 2025
What to do if my Daikin Heat Pump starts operation but makes an immediate stop?
- A
  Angela GreerAug 28, 2025
  If your Daikin Heat Pump starts and then immediately stops, it might be due to: * A blocked air inlet or outlet on either the indoor or outdoor unit. Remove any obstructions. * Clogged air filters. Clean the air filters.

Daikin REYQ-TA Series Specifications

General

Brand	Daikin
Model	REYQ-TA Series
Category	Heat Pump
Language	English

Summary

2. External Appearance

2.1 Indoor Unit

Shows the visual designs of different indoor unit types.

2.2 DOAS Unit

2.3 Outdoor Unit

2.4 Air Treatment Equipment

2.5 Branch Selector Unit

3. Combination of Outdoor Units

1. Safety Cautions

1.1 Warnings and Cautions Regarding Safety of Workers

Provides critical safety warnings and precautions for personnel working on the equipment.

1.2 Warnings and Cautions Regarding Safety of Users

Outlines essential safety cautions and warnings for end-users of the product.

2. Icons Used

1. Model Names of Indoor/Outdoor Units

Indoor/Outdoor Unit Model Names

Lists model names for indoor units, DOAS units, and outdoor units.

Air Treatment and Branch Selector Unit Models

Lists model names for air treatment equipment and branch selector units.

4. Capacity Range

2. Functional Parts Layout

Functional Parts Layout for Outdoor Units

Details the layout of functional components for various outdoor unit models.

3. Refrigerant Flow for Each Operation Mode

1. Applicable Models

2. Names and Functions

BRC1E73 Wired Remote Controller

Details the names and functions of the BRC1E73 wired remote controller.

Wireless Remote Controller

3. MAIN/SUB Setting

MAIN/SUB Setting for Wired and Wireless Controllers

Details the MAIN/SUB setting procedure for both wired and wireless controllers.

4. Centralized Control Group No. Setting

Group Number Settings for Centralized Control

Describes how to set group numbers for centralized control using the remote controller.

5. Service Mode

Service Mode for BRC1E73

Details the procedure for accessing and using the service mode with the BRC1E73 controller.

1. Operation Flowchart (Outdoor Unit)

2. Stop Control

3. Standby Control

4. Startup Control

5. Basic Control

6. Protection Control

Protection Control Mechanisms

Covers high pressure, low pressure, discharge pipe, compressor, and inverter protection.

7. Special Control

Special Control Operations

Covers special operations including pump down, oil return, defrost, and mode switching.

8. Other Control

Other Control Functions

Details backup operations, demand operation, and heating prohibition.

9. Outline of Control (Indoor Unit)

Indoor Unit Control Logic and Flowcharts

Details indoor unit control logic, including operation flowcharts, temperature settings, and sensor functions.

1. Field Setting from Remote Controller

Remote Controller Field Settings

Covers field settings for wired, wireless, and simplified remote controllers.

2. Field Setting from Outdoor Unit

Outdoor Unit Field Settings and Monitoring

Covers accessing BS buttons, operating switches, PC connection, and monitoring functions.

3. Test Operation

Test Operation Procedures and Checkpoints

Details checks before test operation and essential checkpoints for proper execution.

1. Symptom-based Troubleshooting

Indoor Unit Troubleshooting by Symptom

Troubleshooting steps for common indoor unit issues.

Optional Infrared Presence/Floor Sensor Troubleshooting

Troubleshooting specific to systems with optional infrared presence or floor sensors.

2. Service Check Function

Service Check Functions for Remote Controllers

Details service check procedures for wired and wireless remote controllers.

Error Codes and Descriptions

Lists and describes error codes and their corresponding reference pages.

3. Troubleshooting by Error Code

Indoor Unit Errors

Covers abnormalities related to indoor unit PCBs, fan motors, and sensors.

Outdoor Unit Errors

Details errors related to outdoor PCBs, sensors, motors, and compressor protection.

System Errors

Addresses system-level errors such as refrigerant issues, phase problems, and communication failures.

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