Daikin VRV K User Manual

Si-95
Table of Contents i
Inverter K Series
Series
1. Introduction .............................................................................................v
1.1 Safety Cautions ....................................................................................... v
1.2 PREFACE................................................................................................ix
Part1 General Information Inverter K Series ..............................1
1. Outline.....................................................................................................2
1.1 System Outline ........................................................................................ 2
1.2 Allowed Range of Indoor Unit and BS Unit Connection .......................... 3
Part2 Functions Inverter K Series...............................................5
1. Functions.................................................................................................6
1.1 Outdoor Unit Refrigerant Diagrams......................................................... 6
1.2 List of Safety Devices and Functional Parts Setting Values.................... 9
1.3 Flow of Refrigerant in Each Operation Mode ........................................ 10
1.4 Outline of Control................................................................................... 15
1.5 Safety for Restart................................................................................... 17
1.6 Equalized Oil Level Operation
(Equalized Oil Level between Twin Compressors)................................ 19
1.7 Oil Return Operation.............................................................................. 20
1.8 Defrost................................................................................................... 21
1.9 Pressure Equalization Control............................................................... 23
1.10 Frequency Limit Control by Pressure Equalization................................ 24
1.11 BS Changeover Control......................................................................... 25
1.12 Pump Down Residual Operation ........................................................... 26
1.13 Step Down / Safety Control → Standby (Forced Thermostat OFF) →
Stop Due to Malfunction ........................................................................ 27
1.14 Low Noise Control ................................................................................. 29
1.15 Demand Control .................................................................................... 30
1.16 Compressor Capacity Control ............................................................... 31
1.17 Te / Tc Setting ....................................................................................... 32
1.18 Gas Depletion Alarm ............................................................................. 33
1.19 Drain Pump Control ............................................................................... 34
1.20 Louver Control for Preventing Ceiling Dirt ............................................. 36
1.21 Thermostat Sensor in Remote Controller .............................................. 37
1.22 Freeze Prevention ................................................................................. 39
Part3 Test Operation Inverter K Series.....................................41
1. Test Operation ......................................................................................42
1.1 When Power is Turned On .................................................................... 42
1.2 Outdoor Unit PC Board Ass’y................................................................ 43
1.3 Setting Modes........................................................................................ 45
1.4 Sequential Start..................................................................................... 51
1.5 External Control Adaptor for Outdoor Units (DTA104A61 DTA104A62)52
Si-95TOC.fm Page i Tuesday, April 11, 2000 2:19 PM

Daikin VRV K Specifications

General

Category	Inverter
Refrigerant	R410A
Coefficient of Performance (COP)	Up to 4.5 (depending on model and configuration)
Indoor Units Compatibility	Wall Mounted, Floor Standing
Operating Temperature Range (Cooling)	-5°C to 46°C

Summary

Part 1 General Information Inverter K Series

1. Outline

System overview, including unit capabilities and refrigerant piping limits.

1.1 System Outline

Details individual unit control, capacity variation, and flexible piping specifications.

1.2 Allowed Range of Indoor Unit and BS Unit Connection

Specifies conditions for connecting indoor and BS units to outdoor units based on capacity.

Part 2 Functions Inverter K Series

1. Functions

Covers refrigerant diagrams, safety devices, and operational control outlines.

1.1 Outdoor Unit Refrigerant Diagrams

Illustrates refrigerant flow and components within the outdoor unit for various models.

1.2 List of Safety Devices and Functional Parts Setting Values

Details safety devices and functional parts with their corresponding setting values.

1.3 Flow of Refrigerant in Each Operation Mode

Diagrams show refrigerant path during cooling, heating, and simultaneous operations.

1.4 Outline of Control

Explains PI control for compressors, heat exchangers, and motorized valves.

1.5 Safety for Restart

Covers restart safety timers and soft start procedures for compressor protection.

1.6 Equalized Oil Level Operation

Describes the process for equalizing oil levels between twin compressors.

1.7 Oil Return Operation

Details the procedure for collecting and returning refrigeration oil from the piping.

1.8 Defrost

Explains conditions and methods for melting frost on outdoor heat exchangers.

1.9 Pressure Equalization Control

Describes control to balance pressure during BS unit solenoid switching.

1.10 Frequency Limit Control by Pressure Equalization

Limits compressor capacity to prevent abnormal noise during equalizing operations.

1.11 BS Changeover Control

Explains solenoid valve switching based on indoor unit operating conditions.

1.12 Pump Down Residual Operation

Details pump-down operation to discharge refrigerant from the low-pressure side.

1.13 Step Down / Safety Control → Standby (Forced Thermostat OFF) → Stop Due to Malfunction

Covers controls for high pressure, low pressure, discharge pipe temp., and inverter current.

1.14 Low Noise Control

Describes reducing outdoor unit noise by lowering fan and compressor speeds.

1.15 Demand Control

Explains demand operation modes for controlling power consumption.

1.16 Compressor Capacity Control

Details the 20-stage capacity control for inverter and standard compressors.

1.17 Te / Tc Setting

Allows adjustment of target Te/Tc values for compressor capacity control.

1.18 Gas Depletion Alarm

Details the U0 alarm for severe gas depletion, indicated during operation.

1.19 Drain Pump Control

Explains drain pump control via ON/OFF buttons and float switch operation.

1.20 Louver Control for Preventing Ceiling Dirt

Allows air direction adjustment to prevent ceiling dirt on cassette units.

1.21 Thermostat Sensor in Remote Controller

Describes temperature control using remote and indoor unit sensors.

1.22 Freeze Prevention

Explains freeze prevention operation when indoor heat exchanger temperature drops.

Part 3 Test Operation Inverter K Series

1. Test Operation

Covers procedures for initial power-on, setup, and unit extension/replacement.

1.1 When Power is Turned On

Details initial operation, LED indicators, and automatic setting procedures.

1.2 Outdoor Unit PC Board Ass’y

Diagram and identification of components on the outdoor unit PC board.

1.3 Setting Modes

Explains navigation of Setting Mode 1, Setting Mode 2, and Monitor Mode.

1.4 Sequential Start

Describes separating compressor start timing to prevent over-current.

1.5 External Control Adaptor for Outdoor Units (DTA104A61 DTA104A62)

Explains use of external control adaptor for demand and low noise control.

1.6 Cool/Heat Mode Switching

Details three methods for setting cool/heat modes for BS unit systems.

1.7 Low Noise Operation

Describes connecting external input to lower operating noise and save power.

1.8 Demand Control

Explains connecting external input for controlling compressor operation for reduced power.

1.9 Wiring Check Operation

Provides procedure to check transmission wiring between indoor and outdoor units.

1.10 Indoor Field Setting

Covers field settings for indoor units using wired or wireless remote controllers.

1.11 Centralized Control Group No. Setting

Explains setting group numbers for centralized control using remote controllers.

1.12 Setting of Master Remote Controller

Details setting one remote controller as master for operation mode selection.

1.13 Remote Controller Self-Diagnosis Function

Explains remote controller self-diagnosis for identifying malfunctions.

1.14 Operation of the Remote Controller’s Inspection / Test Operation Button

Describes using the inspection/test button for checking unit status and codes.

1.15 Remote Controller Service Mode

Guides on entering and operating the remote controller's service mode.

Part 4 Troubleshooting Inverter K Series

1. Diagnosis by Malfunction Code

Lists malfunction codes, their contents, and fan operation status.

1.1 Diagnosis by Malfunction Code

Table correlating malfunction codes with descriptions and page references.

1.2 Failure Diagnosis

Categorizes failures for inverter systems and optional controllers.

2. Troubleshooting

Detailed troubleshooting for various indoor and outdoor unit malfunctions.

2.1 Indoor Unit: Error of External Protection Device

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

2.2 Indoor Unit: PC Board Defect

Steps for diagnosing and fixing 'A1' error indicating PC board defect.

2.3 Indoor Unit: Malfunction of Drain Level Control System (33H)

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

2.4 Indoor Unit: Fan Motor (M1F) Lock, Overload

Diagnosing and fixing 'A6' error for fan motor lock or overload.

2.5 Indoor Unit: Malfunction of Swing Flap Motor (M1S)

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

2.6 Indoor Unit: Malfunction of Moving Part of Electronic Expansion Valve (Y1E)

Troubleshooting for 'A9' error concerning electronic expansion valve.

2.7 Indoor Unit: Drain Level above Limit

Resolving 'AF' error indicating drain level is above the limit.

2.8 Indoor Unit: Malfunction of Capacity Determination Device

Troubleshooting for 'AJ' error related to capacity determination device.

2.9 Indoor Unit: Malfunction of Thermistor (R2T) for Liquid Pipe

Diagnosing and fixing 'C4' error for faulty liquid pipe thermistor.

2.10 Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes

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

2.11 Indoor Unit: Malfunction of Thermistor (R1T) for Air Inlet

Troubleshooting for 'C9' error concerning air inlet thermistor.

2.12 Indoor Unit: Malfunction of Thermostat Sensor in Remote Controller

Resolving 'CJ' error for faulty thermostat sensor in remote controller.

2.13 Outdoor Unit: Actuation of Safety Device

Troubleshooting for 'E0' error indicating actuation of outdoor unit safety device.

2.14 Outdoor Unit: PC Board Defect

Diagnosing and fixing 'E1' error indicating outdoor unit PC board defect.

2.15 Outdoor Unit: Actuation of High Pressure Switch

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

2.16 Outdoor Unit: Actuation of Low Pressure Sensor

Details troubleshooting for 'E4' error indicating actuation of low pressure sensor.

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

Troubleshooting for 'E9' error concerning electronic expansion valve.

2.18 Outdoor Unit: Abnormal Discharge Pipe Temperature

Guides on resolving 'F3' error related to abnormal discharge pipe temperature.

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

Troubleshooting for 'H9' error concerning outdoor air thermistor.

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

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

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

Guides on diagnosing and fixing 'J5' error for faulty suction pipe thermistor.

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

Troubleshooting for 'J6' error related to heat exchanger thermistor.

2.23 Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor

Troubleshooting for 'JA' error concerning discharge pipe pressure sensor.

2.24 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor

Guides on resolving 'JC' error related to suction pipe pressure sensor.

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

Troubleshooting for 'JH' error concerning oil temperature thermistor.

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

Troubleshooting for 'U0' error related to low pressure drop.

2.27 Negative Phase, Open Phase

Diagnosing and fixing 'U1' errors for negative or open power supply phases.

2.28 Malfunction of Transmission Between Indoor Units

Troubleshooting for 'U4' error concerning transmission issues between indoor units.

2.29 Malfunction of Transmission Between Remote Controller and Indoor Unit

Troubleshooting for 'U5' error related to transmission between remote and indoor units.

2.30 Malfunction of Transmission Between Outdoor Units

Guides on resolving 'U7' error concerning transmission issues between outdoor units.

2.31 Malfunction of Transmission Between MAIN and SUB Remote Controllers

Troubleshooting for 'U8' error related to transmission between main and sub remote controllers.

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

Troubleshooting for 'U9' error concerning transmission between indoor/outdoor units in the same system.

2.33 Excessive Number of Indoor Units

Guides on resolving 'UA' error indicating an excessive number of connected indoor units.

2.34 Address Duplication of Central Remote Controller

Troubleshooting for 'UC' error related to address duplication of the central remote controller.

2.35 Refrigerant System not set, Incompatible Wiring/Piping

Troubleshooting for 'UF' error indicating an unset refrigerant system or incorrect wiring/piping.

2.36 Malfunction of System, Refrigerant System Address Undefined

Guides on resolving 'UH' error concerning system malfunction or undefined refrigerant system address.

Part 5 Appendix

1. Characteristics

Provides characteristic data for thermistors and pressure sensors.

1.1 Thermistor Resistance / Temperature Characteristics

Lists resistance values for thermistors at various temperature points.

1.2 Pressure Sensor Voltage Output / Detected Pressure Characteristics

Shows the relationship between pressure sensor output voltage and detected pressure.

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

Details replacing power transistors and diode modules on the inverter PC board.

3. Precaution

Offers precautions for PC board replacement and remote controller mode numbers.

4. Typical Wiring Mistakes

Illustrates common wiring errors and their resulting operational issues.