Daikin VRV Inverter K Series User Manual

SiE-05C
Table of Contents i
Inverter K Series
Series
1. Introduction . ..........................................................................................ix
1.1 Safety Cautions .......................................................................................ix
1.2 PREFACE. ............................................................................................ xiii
Part1 General Information
Inverter K Series . ..............................................................1
1. Series Introduction . ................................................................................2
1.1 NOMENCLATURE . ................................................................................ 2
1.2 Indoor/Outdoor Unit Combinations. ........................................................ 4
2. Outline of System. ..................................................................................5
2.1 Easily Recognizable Features of the “K” Series...................................... 5
2.2 Changes in K Series Functions / Parts. .................................................. 6
2.3 Compatibility of Old and New VRV System Inverter................................ 9
Part2 Functions
Inverter K Series ..............................................................11
1. Functions...............................................................................................12
1.1 Outdoor Unit Refrigerant System Diagram............................................ 12
1.2 Function of Thermistors and Pressure Sensors .................................... 26
1.3 List of Safety Devices and Functinal Parts Setting Values.................... 27
1.4 Safety for Restart. ................................................................................. 28
1.5 Equalized Oil Level Operation
(Equalized Oil Level between Twin Compressors)................................ 30
1.6 Oil Return Operation. ............................................................................ 31
1.7 Defrost. ................................................................................................. 32
1.8 Heating Pump Down Residual Operation.............................................. 33
1.9 Step Down / Safety Control → Standby (Forced Thermostat OFF)
→ Stop Due to Malfunction. .................................................................. 35
1.10 Control During Low Outdoor Air Temperature Cooling. ........................ 37
1.11 Low Noise Control . ............................................................................... 39
1.12 Demand Control . .................................................................................. 40
1.13 Compressor Capacity Control . ............................................................. 41
1.14 Te / Tc Setting . ..................................................................................... 43
1.15 Gas Depletion Alarm . ........................................................................... 44
1.16 Drain Pump Control. ............................................................................. 45
1.17 Oil Temperature Sensor (8 and 10 Hp only). ........................................ 47
1.18 Louver Control for Preventing Ceiling Dirt. ........................................... 48
1.19 Thermostat Sensor in Remote Controller. ............................................ 49
1.20 Freeze Prevention . ............................................................................... 51
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Daikin VRV Inverter K Series Specifications

General

Refrigerant	R410A
Operating Temperature (Cooling)	-5°C to 46°C
Series	K Series
Power Supply	3-phase, 380-415V, 50Hz
Indoor Unit Options	Cassette, Duct, Wall Mounted
Energy Efficiency Ratio (Cooling)	Varies by model
Coefficient of Performance (Heating)	Varies by model

Summary

Part 2 Functions

Inverter K Series Functions

Detailed explanation of the functions of the Inverter K Series.

Part 3 Test Operation

Inverter K Series Test Operation

Procedures and guidelines for testing the Inverter K Series.

1. Introduction

1.1 Safety Cautions

Critical safety instructions for handling and repair.

1.1.1 Caution in Repair

Specific cautions to be observed during repair work.

1.1.2 Cautions Regarding Products after Repair

Safety guidelines to follow after repair work is completed.

1.1.3 Inspection after Repair

Procedures for inspecting the system after repair.

Part 6 Functions

PLUS Series Functions

Explains the functions specific to the PLUS Series.

1. Outdoor Unit Refrigerant System Diagrams

1.1 Function Unit Refrigerant System Diagram

1.2 Outdoor Unit Refrigerant System Diagram

2. Function of Thermistors and Pressure Sensors

2.1 Function of Thermistors and Pressure Sensors

Explains the roles of various thermistors and pressure sensors.

3. List of Safety Devices and Functional Parts Setting Values

3.1 Outdoor Unit Safety Devices and Functional Parts

Lists safety devices and functional parts with settings for outdoor units.

3.2 Function Unit Safety Devices and Functional Parts

4. Outline of Control

4.1 Starting Control

4.1.1 Soft Start

Details the soft start process to protect the compressor.

4.1.2 Cooling Start Following Layup

4.1.3 Heating Pump Down Start (For Heat Pump System)

4.1.4 Heating Power on Start (For Heat Pump System)

4.2 Pressure Equalizing Control Before Starting

4.3 Oil Return Control

Outlines the conditions required for executing oil return control.

4.4 Defrost (For Heat Pump System)

Specifies the conditions that trigger defrost operation.

4.5 Oil Equalization Control

4.5.2 When Heating

4.6 Heating Pump Down Residual Operation (For Heat Pump System)

4.7 Compressor Oil Temperature Protection Control

Explains compressor oil temperature protection mechanisms.

4.8 Low Pressure Protection Control Step

Details the steps for low pressure protection control.

4.11 Cooling Overload Control

Explains control measures for cooling overload.

4.9 High Pressure Control Step

Details the steps for controlling high pressure.

4.10 Discharge Temperature Protection Control

Protection control for discharge temperature for both unit types.

4.12 Inverter Protection Control

4.12.2 Step Down Control by Inverter Fin

4.14 Low Outdoor Temperature Control When Cooling

4.15.2 Demand Control

4.17 Backup Operation

Explains how the system operates when a unit is faulty.

4.18 Emergency Operation

Details the first type of emergency operation when an outdoor unit malfunctions.

4.18.2 Emergency Operation 2

Explains the second type of emergency operation for faulty outdoor units.

4.19 Pump Down Operation

4.19.2 In Case of Cooling Only System

5. Flow of Refrigerant in Each Operating Mode

5.1 Heat Pump Model Refrigerant Flow

5.1.11 Emergency Operation for Inverter Failure (Cooling) Refrigerant Flow

5.1.12 Emergency Operation for Inverter Failure (Heating) Refrigerant Flow

5.2 Cooling Only Model Refrigerant Flow

5.2.5 Emergency Operation for Inverter Failure (Cooling) Refrigerant Flow

Part 8 Troubleshooting

PLUS Series Troubleshooting

Troubleshooting guide for the PLUS Series.

1. Troubleshooting for VRV PLUS Series

1.1 Troubleshooting for VRV PLUS Series

General troubleshooting steps for VRV PLUS Series.

2. Diagnosis by Malfunction Code

2.1 Diagnosis by Malfunction Code

Lists malfunction codes, their contents, and corresponding pages.

3. Troubleshooting

3.1 Outdoor Unit: Actuation of Safety Device

Troubleshooting steps for outdoor unit safety device actuation.

3.2 Outdoor Unit: PC Board Defect

Troubleshooting for defective outdoor unit PC boards.

3.3 Outdoor Unit: Acturation of High Pressure Switch

Troubleshooting steps for outdoor unit high pressure switch actuation.

3.4 Outdoor Unit: Actuation of Low Pressure Switch

Troubleshooting steps for outdoor unit low pressure switch actuation.

3.5 Outdoor Unit: Malfunction of Moving Part of Electronic Expansion Valve (Y1E)

Troubleshooting for electronic expansion valve moving part malfunctions.

3.6 Outdoor Unit: Abnormal Discharge Pipe Temperture

Troubleshooting steps for abnormal discharge pipe temperatures.

3.7 Outdoor Unit: Defect of Pressure Switch for High Pressure Control

3.8 Outdoor Unit: Defect of Pressure Switch for Low Pressure Control

3.9 Outdoor Unit: Malfunction of Thermistor for Outdoor Air (R1T)

3.10 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R3T)

3.11 Outdoor Unit: Malfunction of Thermistor (R4T) for Suction Pipe

3.12 Outdoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger

3.13 Outdoor Unit: Malfunction of Thermistor (R6T) for Header

3.14 Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor

3.15 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor

3.16 Outdoor Unit: Malfunction of Oil Temperature Thermistor (R5T)

3.17 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure

Troubleshooting for low pressure issues related to refrigerant or EEV.

3.18 Negative Phase, Open Phase

3.19 Malfunction of Transmission Between Indoor Units

Troubleshooting steps for transmission malfunctions between indoor units.

3.20 Malfunction of Transmission Between Outdoor Units

Troubleshooting for transmission malfunctions between outdoor units.

3.21 Malfunction of Transmission Between Master and Slave Remote Controllers

Troubleshooting steps for master/slave remote controller communication issues.

3.22 Malfunction of Transmission Between Indoor and Outdoor Units in the Same System

Troubleshooting for transmission malfunctions within the same system.

3.24 Address Duplication of Central Remote Controller

Troubleshooting steps for duplicate addresses in central remote controllers.

3.25 Refrigerant System not set, Incompatible Wiring/Piping

Troubleshooting for issues where the refrigerant system is not set or wiring/piping is incompatible.

3.26 Malfunction of System, Refrigerant System Address Undefined

4. Failure Diagnosis for Inverter System

4.1 Points of Diagnosis

Key points for diagnosing inverter system failures.

4.2 How to use the Monitor Switch on the Inverter PC Board

Guide on using the monitor switch on the inverter PC board for diagnostics.

4.2 How to Use The Monitor Switch On The Inverter PC Board

Guide on using the monitor switch on the inverter PC board for diagnostics.

5. Troubleshooting (Inverter)

5.1 Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise

Troubleshooting steps for inverter radiating fin temperature rise issues.

5.2 Outdoor Unit: Inverter Instantaneous Over-Current

Troubleshooting steps for inverter instantaneous over-current faults.

5.3 Outdoor Unit: Inverter Thermostat Sensor, Compressor Overload

Troubleshooting for inverter thermostat sensor and compressor overload issues.

5.4 Outdoor Unit: Inverter Stall Prevention, Compressor Lock

Troubleshooting steps for inverter stall prevention and compressor lock.

5.5 Outdor Unit: Malfunction of Transmission between Inverter and Control PC Board

Troubleshooting for transmission malfunctions between inverter and control PC boards.

5.5 Malfunction of Connection Between The Inverter Unit and Outdoor Unit PC Board

Troubleshooting for connection issues between inverter and outdoor PC boards.

5.6 Power Supply Insufficient or Instantaneous Failure

Troubleshooting steps for insufficient power supply or instantaneous failures.

5.7 Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise Sensor

Troubleshooting for malfunctions related to the inverter radiating fin temperature sensor.

5.8 Outdoor Unit: Inverter Over-Ripple Protection

Troubleshooting steps for inverter over-ripple protection.

5.8 Open Phase

5.9 Defect of Radiator Fin Temperature Sensor

Troubleshooting steps for defects in the radiator fin temperature sensor.

Part 9 Special Service Mode

PLUS Series Special Service Mode

1. Backup and Emergency Operation

1.1 Backup and Emergency Operation

Details on backup and emergency operation features.

1.1.1 Backup Operation

Explains the backup operation when a constant speed outdoor unit malfunctions.

1.1.2 Emergency Operation

Details emergency operation procedures when an outdoor unit malfunctions.

2. Pump Down Operation when Replacing The Compressor

2.1 Pump Down Operation when Replacing The Compressor

Procedures for pump down operation during compressor replacement.

2.1.1 Method for Pump Down Operation

Step-by-step method for performing pump down operation.

1. Features of the VRV PLUS Series

1.1 Improved Piping System

1.2 Improved Piping System

1.3 Dramatic Reduction of Wiring Saves Time and Labor When Installing

1.3.1 Less Wiring

3. Indoor / Outdoor Unit Combinations

3.1 Indoor/Outdoor Unit Combinations

Part 7 Test Operation

PLUS Series Test Operation

Test operation procedures specific to the PLUS Series.

1. Test Operation

1.1 Procedure and Outline

Outlines the general procedure and sequence for test operation.

1.1.1 Check The Following Before Turning Power On.

Pre-checks to perform before turning on power for test operation.

1.1.2 Turn Power On.

Steps for turning on the power for test operation.

1.2 Operation When Power is Turned On

Explains system behavior and settings after power is turned on.

1.3 Outdoor Unit PC Board Ass’y

1.5.1 Setting Mode 1

1.5.2 Setting Mode 2

1.5.3 Monitor Mode

1.7.1 Cool/Heat Mode Unified Selection

1.8 Cool/Heat Mode Switching (*Except for Cooling Only System)

1.10 Demand Control

1.11 Wiring Check Operation

6. Troubleshooting (OP: Central Remote Controller)

6.1 Malfunction of Transmission between Central Remote Controller and Indoor Unit

Troubleshooting communication issues between central remote controller and indoor units.

6.2 PC Board Defect

6.3 Malfunction of Transmission between Optional Controllers for Centralized Control

6.4 Improper Combination of Optional Controllers for Centralized Control

6.5 Address Duplication, Improper Setting

7. Troubleshooting (OP: Schedule Timer)

7.1 Malfunction of Transmission between Central Remote Controller and Indoor Unit

7.2 PC Board Defect

7.3 Malfunction of Transmission between Optional Controllers for Centralized Control

7.5 Address Duplication, Improper Setting

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

8.1 Operation Lamp Blinks

8.2 Display “Under Host Computer Integrate Control” Blinks (Repeats Single Blink)

8.3 Display “Under Host Computer Integrate Control” Blinks (Repeats Double Blink)

3. Characteristics

3.1 Thermistor Resistance / Temperature Characteristics

3.2 Pressure Sensor Voltage Output / Detected Pressure Characteristics

4. Method of Replacing The Inverter’s Power Transistors and Diode Modules

4.1 Method of Replacing The Inverter’s Power Transistors and Diode Modules

Step-by-step guide for replacing inverter power transistors and diode modules.