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Daikin REYQ8-48PY1B User Manual

Daikin REYQ8-48PY1B
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Service
Manual
REYQ8-48PY1B
R-410A Heat Recovery 50Hz
SiBE37-701_B

Table of Contents

Questions and Answers:

Daikin REYQ8-48PY1B Specifications

General IconGeneral
BrandDaikin
ModelREYQ8-48PY1B
CategoryHeater
LanguageEnglish

Summary

Introduction

1.1 Safety Cautions

Provides essential safety guidelines and pictograms for repair work. Emphasizes warnings for potential death or injury.

1.2 PREFACE

Introduces the service manual for Daikin's VRVIII series Heat Recovery System.

Part 1 General Information

1. Model Names of Indoor/Outdoor Units

Lists the model names for indoor and outdoor units, including series and power supply information.

2. External Appearance

Provides visual representations of various indoor and outdoor units.

3. Combination of Outdoor Units

Details the possible combinations of indoor and outdoor units based on system capacity.

4. Model Selection

Guides the selection of models based on connectable indoor units and total capacity.

Part 2 Specifications

1. Specifications

Contains detailed specifications for the VRV III Heat Recovery Series outdoor units.

1.1 Outdoor Units

Lists technical specifications for various outdoor units, including capacity, dimensions, and components.

1.2 Indoor Units

Provides technical specifications for various indoor unit types.

1.3 BS Units

Lists specifications for BS Units, including connection range and power supply.

Part 3 Refrigerant Circuit

1. Refrigerant Circuit

Details the refrigerant circuit for different outdoor unit models and capacities.

1.1 REYQ8P, 10P, 12P

Lists the symbols and major functions of components in the refrigerant circuit for REYQ8P, 10P, and 12P models.

1.2 REYQ14P, 16P

Lists the symbols and major functions of components in the refrigerant circuit for REYQ14P and 16P models.

1.3 REMQ8P (Multi 8HP)

Lists the symbols and major functions of components in the refrigerant circuit for REMQ8P.

1.4 REMQ10P, 12P (Multi 10, 12HP)

Lists the symbols and major functions of components in the refrigerant circuit for REMQ10P and 12P.

1.5 REMQ14P, 16P (Multi 14, 16HP)

Lists the symbols and major functions of components in the refrigerant circuit for REMQ14P and 16P.

1.6 BS Unit Functional Parts

Lists functional parts specific to the BS Unit.

1.7 Indoor Units

Lists the symbols and functions of components within indoor units.

2. Functional Parts Layout

Illustrates the layout of functional parts within the outdoor units.

2.1 REYQ8P, 10P, 12P

Shows the functional parts layout for REYQ8P, 10P, and 12P outdoor units.

2.2 REYQ14P, 16P

Shows the functional parts layout for REYQ14P and 16P outdoor units.

2.3 REMQ8P

Shows the functional parts layout for REMQ8P outdoor units.

2.4 REMQ10P, 12P

Shows the functional parts layout for REMQ10P and 12P outdoor units.

2.5 REMQ14P, 16P

Shows the functional parts layout for REMQ14P and 16P outdoor units.

3. Refrigerant Flow for Each Operation Mode

Illustrates refrigerant flow diagrams for various operational modes like cooling and heating.

Part 4 Function

1. Function General

Provides a general overview of system functions, including symbols and operational modes.

1.1 Symbol

Explains the various symbols used in the document and their meanings.

1.2 Operation Mode

Details the different operation modes of the system, including normal and standby.

2. Basic Control

Describes fundamental control functions like normal operation and PI control.

2.1 Normal Operation

Explains the standard operating procedures and component functions.

2.3 Electronic Expansion Valve PI Control

Details the PI control mechanism for the electronic expansion valve.

2.5 Outdoor Unit Fan Control in Cooling Operation

Explains the fan control logic for the outdoor unit during cooling operation.

2.6 Heat Exchanger Control

Describes how the heat exchanger is controlled to ensure optimal performance.

3. Special Control

Covers special control functions such as startup, oil return, and defrost operations.

3.1 Startup Control

Details the control procedures for starting the compressor and system.

3.3 Oil Return Operation

Explains the function for recovering refrigerant oil to prevent compressor issues.

3.4 Defrost Operation

Describes the defrost operation and its start conditions.

4. Protection Control

Outlines the various protection controls to prevent system damage.

4.1 High Pressure Protection Control

Details the control logic to prevent abnormal high pressure and protect compressors.

4.2 Low Pressure Protection Control

Describes the control logic to protect compressors against transient low pressure decrease.

4.3 Discharge Pipe Protection Control

Explains the control to protect compressor internal temperature against malfunction.

4.4 Inverter Protection Control

Covers inverter current and fin temperature controls to prevent tripping.

4.5 STD Compressor Overload Protection

Details the control to prevent abnormal heating due to overcurrent to STD compressors.

5. Other Control

Covers miscellaneous control functions like backup and demand operations.

5.1 Backup Operation

Describes emergency operation procedures when compressors or outdoor units malfunction.

5.2 Demand Operation

Explains how to save power by limiting outdoor unit capacity through Demand 1 or 2 settings.

5.3 Heating Operation Prohibition

Specifies the condition under which heating operation is prohibited (outdoor air temperature).

6. Outline of Control (Indoor Unit)

Provides an overview of the control logic for indoor units.

6.1 Operation Flow Chart

Visual representation of the indoor unit's operational flow and logic.

6.2 Thermostat Control

Explains temperature control using remote controller and indoor unit suction air thermistors.

6.3 Drain Pump Control

Details the control logic for the drain pump based on float switch and thermostat status.

6.4 Control of Electronic Expansion Valve

Explains how electronic expansion valves control superheated and subcooled degrees.

6.5 Freeze Prevention

Describes the operation to prevent freezing of the indoor unit heat exchanger.

Part 5 Test Operation

1. Test Operation

Covers the overall test operation procedures after installation.

1.1 Installation Process

Outlines the sequence of installation steps.

1.2 Procedure and Outline

Details the procedure for initial test operation after installation.

1.2.1 Check Work Prior to Turn Power Supply On

Lists critical checks to perform before turning on the power supply.

1.2.2 Turn Power On

Describes the procedure for turning on the power for outdoor and indoor units.

1.2.5 Additional Refrigerant Charge and Check Operation

Details procedures for adding refrigerant and performing check operations.

1.2.5.2 Procedure of Adding Refrigerant Charging and Check Operation

Provides a step-by-step guide for adding refrigerant and conducting checks.

1.2.5.2.2 Procedure of check operation

Outlines the procedure for performing the check operation after installation.

1.2.5.2.3 TEST RUN

Describes the final test run procedure to confirm proper operation.

3. Field Setting

Explains how to perform field settings for the system.

3.1 Field Setting from Remote Controller

Details how to adjust settings using the wired remote controller.

3.2 Field Setting from Outdoor Unit

Describes field setting procedures using switches on the outdoor unit PCB.

Part 6 Troubleshooting

1. Symptom-based Troubleshooting

Lists troubleshooting steps based on observed system symptoms and supposed causes.

2. Troubleshooting by Remote Controller

Provides troubleshooting methods using the remote controller's functions.

2.1 The INSPECTION / TEST Button

Explains how to use the Inspection/Test button to access various modes.

2.2 Self-diagnosis by Wired Remote Controller

Describes how to perform self-diagnosis using a wired remote controller.

2.3 Self-diagnosis by Wireless Remote Controller

Details the self-diagnosis procedure for wireless remote controllers.

2.4 Inspection Mode

Explains how to enter and use the inspection mode for checking codes and data.

2.5 Remote Controller Service Mode

Provides instructions for accessing the service mode on the remote controller.

2.6 Test Run Mode

Describes how to set and operate the system in test run mode.

2.7 Remote Controller Self-Diagnosis Function

Explains the self-diagnosis function of the remote controller for malfunctions.

3. Troubleshooting by Indication on the Remote Controller

Lists malfunction codes displayed on the remote controller and their troubleshooting steps.

3.1 “A0” Indoor Unit: Error of External Protection Device

Troubleshooting steps for 'A0' error related to external protection devices.

3.2 “A1” Indoor Unit: PCB Defect

Troubleshooting steps for 'A1' error indicating a defect in the indoor unit PCB.

3.3 “A3” Indoor Unit: Malfunction of Drain Level Control System (S1L)

Troubleshooting steps for 'A3' error related to the drain level control system.

3.4 “A6” Indoor Unit: Fan Motor (M1F) Lock, Overload

Troubleshooting steps for 'A6' error related to fan motor lock or overload.

3.5 “A7” Indoor Unit: Malfunction of Swing Flap Motor (M1S)

Troubleshooting steps for 'A7' error related to swing flap motor malfunction.

3.6 “A8” Abnormal Power Supply Voltage

Troubleshooting steps for 'A8' error indicating abnormal power supply voltage.

3.7 “A9” Electronic Expansion Valve Malfunction / Dust Clogging

Troubleshooting steps for 'A9' error related to electronic expansion valve malfunction.

3.7 “A9” Indoor Unit: Malfunction of Electronic Expansion Valve Coil

Troubleshooting steps for 'A9' error related to electronic expansion valve coil.

3.8 “AF” Indoor Unit: Drain Level above Limit

Troubleshooting steps for 'AF' error indicating drain level is above limit.

3.10 “C1” Indoor Unit: Failure of Transmission (Between Indoor unit PCB and Fan PCB)

Troubleshooting steps for 'C1' error indicating transmission failure between PCBs.

3.11 “C4” Indoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger

Troubleshooting steps for 'C4' error related to heat exchanger thermistor malfunction.

3.12 “C5” Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes

Troubleshooting steps for 'C5' error related to gas pipe thermistor malfunction.

3.14 “C9” Indoor Unit: Malfunction of Thermistor (R1T) for Suction Air

Troubleshooting steps for 'C9' error related to suction air thermistor malfunction.

3.16 “E1” Outdoor Unit: PCB Defect

Troubleshooting steps for 'E1' error indicating a defect in the outdoor unit PCB.

3.17 “E3” Outdoor Unit: Actuation of High Pressure Switch

Troubleshooting steps for 'E3' error related to high pressure switch actuation.

3.18 “E4” Outdoor Unit: Actuation of Low Pressure Sensor

Troubleshooting steps for 'E4' error related to low pressure sensor actuation.

3.19 “E5” Outdoor Unit: Inverter Compressor Motor Lock

Troubleshooting steps for 'E5' error indicating inverter compressor motor lock.

3.20 “E6” Outdoor Unit: STD Compressor Motor Overcurrent/Lock

Troubleshooting steps for 'E6' error related to STD compressor overload or lock.

3.21 “E7” Outdoor Unit: Malfunction of Outdoor Unit Fan Motor

Troubleshooting steps for 'E7' error related to outdoor unit fan motor malfunction.

3.22 “E9” Outdoor Unit: Malfunction of Electronic Expansion Valve Coil (Y1E~Y5E)

Troubleshooting steps for 'E9' error related to electronic expansion valve coil malfunction.

3.23 “F3” Outdoor Unit: Abnormal Discharge Pipe Temperature

Troubleshooting steps for 'F3' error related to abnormal discharge pipe temperature.

3.24 “F6” Outdoor Unit: Refrigerant Overcharged

Troubleshooting steps for 'F6' error indicating refrigerant overcharge.

3.25 “F9” Outdoor Unit : Malfunction of BS Unit Electronic Expansion Valve

Troubleshooting steps for 'F9' error related to BS unit electronic expansion valve.

3.26 “H7” Outdoor Unit: Abnormal Outdoor Fan Motor Signal

Troubleshooting steps for 'H7' error related to abnormal outdoor fan motor signal.

3.27 “H9” Outdoor Unit: Malfunction of Thermistor (R1T) for Outdoor Air

Troubleshooting steps for 'H9' error related to outdoor air thermistor malfunction.

3.28 “J2” Outdoor Unit: Current Sensor Malfunction

Troubleshooting steps for 'J2' error related to current sensor malfunction.

3.29 “J3” Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R31T, R32T, R33T)

Troubleshooting steps for 'J3' error related to discharge pipe thermistor malfunction.

3.30 “J4” Outdoor Unit: Malfunction of Temperature Sensor for Heat Exchanger Gas (R2T or R11T)

Troubleshooting steps for 'J4' error related to heat exchanger gas sensor malfunction.

3.31 “J5” Outdoor Unit: Malfunction of Thermistor (R8T or R10T) for Suction Pipe

Troubleshooting steps for 'J5' error related to suction pipe thermistor malfunction.

3.32 “J6” Outdoor Unit: Malfunction of Thermistor (R4T or R12T) for Outdoor Unit Heat Exchanger

Troubleshooting steps for 'J6' error related to outdoor unit heat exchanger thermistor malfunction.

3.33 “J7” Outdoor Unit: Malfunction of Liquid Pipe Thermistor 1 (R6T, R9T or R14T)

Troubleshooting steps for 'J7' error related to liquid pipe thermistor 1 malfunction.

3.34 “J8” Outdoor Unit: Malfunction of Liquid Pipe Thermistor 2 (R7T or R15T)

Troubleshooting steps for 'J8' error related to liquid pipe thermistor 2 malfunction.

3.35 “J9” Outdoor Unit: Malfunction of Subcooling Heat Exchanger Gas Pipe Thermistor (R5T or R13T)

Troubleshooting steps for 'J9' error related to subcooling heat exchanger gas pipe thermistor.

3.36 “JA” Outdoor Unit: Malfunction of High Pressure Sensor

Troubleshooting steps for 'JA' error related to high pressure sensor malfunction.

3.37 “JC” Outdoor Unit: Malfunction of Low Pressure Sensor

Troubleshooting steps for 'JC' error related to low pressure sensor malfunction.

3.38 “L1” Outdoor Unit: Malfunction of Inverter PCB

Troubleshooting steps for 'L1' error related to inverter PCB malfunction.

3.39 “L4” Outdoor Unit: Malfunction of Inverter Radiation Fin Temperature Rise

Troubleshooting steps for 'L4' error related to inverter radiation fin temperature rise.

3.40 “L5” Outdoor Unit: Momentary Overcurrent of Inverter Compressor

Troubleshooting steps for 'L5' error related to momentary overcurrent of inverter compressor.

3.41 “L8” Outdoor Unit: Momentary Overcurrent of Inverter Compressor

Troubleshooting steps for 'L8' error related to momentary overcurrent of inverter compressor.

3.42 “L9” Outdoor Unit: Inverter Compressor Starting Failure

Troubleshooting steps for 'L9' error related to inverter compressor starting failure.

3.43 “LC” Outdoor Unit: Malfunction of Transmission between Inverter and Control PCB

Troubleshooting steps for 'LC' error related to transmission failure between PCBs.

3.44 “P1” Outdoor Unit: Inverter Over-Ripple Protection

Troubleshooting steps for 'P1' error related to inverter over-ripple protection.

3.45 “P4” Outdoor Unit: Malfunction of Inverter Radiation Fin Temperature Rise Sensor

Troubleshooting steps for 'P4' error related to inverter radiation fin temperature sensor.

3.46 “PJ” Outdoor Unit: Faulty Field Setting after Replacing Main PCB or Faulty Combination of PCB

Troubleshooting steps for 'PJ' error related to incorrect field settings or PCB combination.

3.47 “U0” Outdoor Unit: Refrigerant Shortage Alert

Troubleshooting steps for 'U0' error related to refrigerant shortage.

3.48 “U1” Reverse Phase, Open Phase

Troubleshooting steps for 'U1' error related to power supply phase issues.

3.49 “U2” Outdoor Unit: Power Supply Insufficient or Instantaneous Failure

Troubleshooting steps for 'U2' error related to insufficient or failed power supply.

3.50 “U3” Outdoor Unit: Check Operation is not Executed

Troubleshooting steps for 'U3' error when check operation is not executed.

3.51 “U4” Malfunction of Transmission between Indoor Units and Outdoor Units

Troubleshooting steps for 'U4' error regarding transmission between indoor and outdoor units.

3.52 “U5” Indoor Unit: Malfunction of Transmission between Remote Controller and Indoor Unit

Troubleshooting steps for 'U5' error regarding transmission between remote and indoor units.

3.53 “U7” Outdoor Unit: Transmission Failure (Across Outdoor Units)

Troubleshooting steps for 'U7' error related to transmission failure between outdoor units.

3.54 “U8” Indoor Unit: Malfunction of Transmission between Main and Sub Remote Controllers

Troubleshooting steps for 'U8' error regarding transmission between main and sub remote controllers.

3.55 “U9” Indoor Unit: Malfunction of Transmission between Indoor and Outdoor Units in the Same System

Troubleshooting steps for 'U9' error regarding transmission within the same system.

3.56 “UA” Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller

Troubleshooting steps for 'UA' error related to improper unit combinations.

3.57 “UC” Address Duplication of Centralized Controller

Troubleshooting steps for 'UC' error related to centralized controller address duplication.

3.58 “UE” Malfunction of Transmission between Centralized Controller and Indoor Unit

Troubleshooting steps for 'UE' error regarding transmission between centralized controller and indoor unit.

3.59 “UF” System is not Set yet

Troubleshooting steps for 'UF' error when the system is not set up.

3.60 “UH” Malfunction of System, Refrigerant System Address Undefined

Troubleshooting steps for 'UH' error related to system malfunction or undefined address.

4. Troubleshooting (OP: Centralized Remote Controller)

Troubleshooting specific to centralized remote controller operations.

4.1 “M1” PCB Defect

Troubleshooting steps for 'M1' error indicating a defect in the centralized controller PCB.

4.2 “M8” Malfunction of Transmission between Optional Controllers for Centralized Control

Troubleshooting steps for 'M8' error related to transmission between optional controllers.

4.3 “MA” Improper Combination of Optional Controllers for Centralized Control

Troubleshooting steps for 'MA' error related to improper combination of optional controllers.

4.4 “MC” Address Duplication, Improper Setting

Troubleshooting steps for 'MC' error related to address duplication or improper setting.

5. Troubleshooting (OP: Unified ON/OFF Controller)

Troubleshooting for systems using the unified ON/OFF controller.

5.1 Operation Lamp Blinks

Troubleshooting for blinking operation lamp on the unified ON/OFF controller.

5.2 Display “Under Centralized Control” Blinks (Repeats Single Blink)

Troubleshooting for single blink display of 'Under Centralized Control'.

5.3 Display “Under Centralized Control” Blinks (Repeats Double Blink)

Troubleshooting for double blink display of 'Under Centralized Control'.

Part 7 Appendix

1. Piping Diagrams

Provides diagrams illustrating the refrigerant piping for outdoor and indoor units.

1.1 Outdoor Unit

Piping diagrams for various outdoor unit models.

1.2 Indoor Unit

Piping diagrams for various indoor unit models.

1.3 BS Unit

Piping diagrams specific to the BS Unit.

2. Wiring Diagrams for Reference

Provides wiring diagrams for outdoor, indoor, and BS units.

2.1 Outdoor Unit

Wiring diagrams for outdoor units.

2.2 Field Wiring

Details field wiring connections for system components.

2.3 Indoor Unit

Wiring diagrams for various indoor unit models.

2.4 BS Unit

Wiring diagrams specific to the BS Unit.

3. List of Electrical and Functional Parts

Lists electrical and functional parts for outdoor and indoor units.

3.1 Outdoor Unit

Lists electrical and functional parts for outdoor units.

3.2 Indoor Side

Lists electrical and functional parts for indoor units.

4. Option List

Lists available optional accessories for the system.

4.1 Option List of Controllers

Lists optional accessories related to controllers.

4.2 Option Lists (Outdoor Unit)

Lists optional accessories applicable to outdoor units.

5. Piping Installation Point

Provides guidelines for correct piping installation points.

5.1 Piping Installation Point

Details specific points for piping installation.

5.2 The Example of a Wrong Pattern

Illustrates common mistakes in piping installation and their consequences.

6. Example of connection

Provides examples of system connections, including piping and unit configurations.

7. Thermistor Resistance / Temperature Characteristics

Provides data on thermistor resistance values at different temperatures.

9. Method of Checking the Inverter’s Power Transistors and Diode Modules

Details the procedure for checking inverter power transistors and diode modules.

Part 8 Precautions for New Refrigerant (R-410A)

1. Precautions for New Refrigerant (R-410A)

Provides essential precautions for handling and using R-410A refrigerant.

1.1 Outline

Gives a general overview of R-410A refrigerant characteristics.

1.2 Refrigerant Cylinders

Provides information on the handling and safety of R-410A refrigerant cylinders.

1.3 Service Tools

Lists the dedicated tools and devices required for R-410A systems.

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