Daikin FTX25JAV1NB Service Manual

Si18-201
J Series
[Applied Models]
!
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!Super Multi Plus : Cooling Only
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!Super Multi Plus : Heat Pump
Service
Manual

Daikin FTX25JAV1NB Specifications

General

Category	Heat Pump
Model	FTX25JAV1NB
Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Weight (Indoor Unit)	9 kg
Indoor Unit Weight	9 kg
Power Supply	220-240V / 50Hz

Summary

Part 3 Printed Circuit Board Connector Wiring Diagram and Name

1. Printed Circuit Board Connector Wiring Diagram and Name

1.1 Branch Provider Unit BPMK928B42, B43

Details PCB connectors for Branch Provider units BPMK928B42 and B43.

1.2 Outdoor Unit RMK (X) 140JVMT (C) 9 (8), RMK140JAVM, RMX140JVMB, RMK (X) 140JZVMA (B)

Wiring diagrams for various outdoor unit models.

1.3 FTK25 / 35J Series, FTX25 / 35J Series, FTXD25 / 35K Series, FVX25 / 35K Series

Wiring diagrams for specific FTK, FTX, FTXD, and FVX series.

1.4 FTK50~60HV Series, FTKD50~71JV Series, FTX50~60HV Series, FTXD50~71JV Series

Wiring diagrams for FTK, FTKD, FTX, and FTXD series.

1.5 CDX25~60HAV Series, CDK25~60HAV Series

Wiring diagrams for CDX and CDK HAV series indoor units.

1.6 FLK25~60HV Series, FLX25~60HV Series, FLK50 / 60JV Series, FLX50 / 60JV Series

Wiring diagrams for FLK and FLX series indoor units.

1.7 FHYC35~71KV Series

Wiring diagrams for FHYC KV series indoor units.

1.8 FDYM60FA, FDYM03FA Series

Wiring diagrams for FDYM series indoor units.

Part 5 Main Functions Outdoor Unit / BP Unit

1. Refrigerant System and Function of Functional Parts of Outdoor Unit

Details the refrigerant system and components of outdoor units.

1.1 Refrigerant System and Function of Functional Parts of Outdoor Unit

Explains the refrigerant circuit and functional parts of outdoor units.

1.2 Major Functional Parts

1.3 Protective Devices, Thermistors, Sensors

Lists and explains protective devices, thermistors, and sensors.

2. Protection Device

2.1 Outdoor Unit

2.2 BP Unit

3. System control

Overview of the system's control logic and operations.

3.1 Outline of System Control

Provides a summary of the overall system control strategy.

3.2 Mode Configuration

3.3 Standby Control at Power ON

Explains standby control procedures when power is applied.

3.4 Cooling / Heating Standby Operation at Startup

Describes standby operations during cooling and heating startup.

3.5 Equalizing Control

Details the equalizing control process for system stability.

3.6 Determination of Initial Frequency

Explains how the initial operating frequency is determined.

3.7 Oil Return Operation

Describes the procedure for oil return operations.

3.8 Defrost Operation

Details the defrost operation cycle and conditions.

3.9 Pre-Equalization Standby Operation

Explains the pre-equalization standby operation process.

3.10 Equalizing Control

Provides details on the equalizing control process.

3.11 Capacity Control

Explains the system's capacity control mechanisms.

3.12 Peak Cut Control

Details the peak cut control function to prevent high pressure.

3.13 Freeze-Up Prevention

Describes the freeze-up prevention control for indoor heat exchangers.

3.14 Gas Shortage Malfunction

Explains how gas shortage malfunctions are detected and handled.

3.15 Discharge Pipe Control

Details the control logic for discharge pipe temperature.

3.16 Input Current Control

Explains the input current control mechanisms.

3.17 Wet Protection Control I

Details the wet protection control function.

3.18 Electric Parts Cooling and Electric Parts / Fin Temperature Control

Describes cooling for electric parts and fin temperature control.

3.19 Differential Pressure Control

Explains the differential pressure control for fan speed.

3.20 Year-Round Cooling-Only Function

Details the function for year-round cooling operation.

3.21 Nighttime Low Noise Control

Describes the nighttime low noise control features.

3.22 PI Control

Explains the PI control mechanism for frequency adjustment.

3.23 Warm-Up Function

Details the warm-up function for compressor startup.

3.24 Compressor Protection Control

Explains compressor protection controls during startup.

3.25 Fan Control

Describes fan control strategies under various conditions.

3.26 Motorized Valve Control of Outdoor Unit

Details the control of motorized valves in the outdoor unit.

3.27 Cooling Outdoor Unit SC Control

Explains the subcooling control for outdoor units during cooling.

3.28 BP Unit Motorized Valve Control

Details the control of motorized valves for BP units.

3.29 Gas Pipe Isothermal Control in Cooling Operation

Explains isothermal control for gas pipes during cooling.

3.30 SH Control in Cooling Operation

Details the SH control for cooling operations.

3.31 SC Control in Heating Operation

Explains the SC control for heating operations.

3.32 Heat Exchanger Isothermal Control in Heating Operation

Describes isothermal control for heat exchangers in heating mode.

3.33 BP Unit Motorized Valve Control in High Discharge Pipe Temperature

Details BP unit valve control for high discharge pipe temperature.

3.34 Inter-BP Units Heating Heat Exchanger Isothermal Control

Explains isothermal control for heat exchangers between BP units in heating.

3.35 Inter-BP Units Gas Pipe Isothermal Control

Describes isothermal control for gas pipes between BP units.

3.36 BP Unit Motorized Valve Control by Target Discharge Pipe Temperature

Details BP unit valve control based on target discharge pipe temperature.

3.37 4-Way Valve Operation

Explains the operation and security of the 4-way valve.

3.38 JIS Mode

3.39 Pump Down Operation

Details the pump down operation procedure.

3.40 Protection Control of SkyAir Indoor Units

Part 7 Operations

1.1 Wireless Remote Controller

Part 8 Operating Test

1. Operating Test

1.1 Operating Test

1.2 Test Operation Switch

1.3 Pump Down Operation Switch

2. Method of Field Set

2.1 Field Setting

2.2 Group Number Setting for Central Remote Control

2.4 Precautions: For RMK140J / RMX140J Outdoor Unit Users

Part 9 Service Diagnosis

1. Troubleshooting - Split Type Indoor Unit

1.1 Troubleshooting with the Operation Lamp

1.2 Service Check Function

1.3 Code Indication on the Remote Controller

1.4 Troubleshooting

1.5 Troubleshooting Detail

2. Troubleshooting - SkyAir Indoor Unit

2.1 The INSPECTION/TEST Button

2.2 Self-Diagnosis by Wired Remote Controller

2.3 Fault Diagnosis by Wireless Remote Controller

2.4 Troubleshooting by LED on the Indoor Unit’s

2.5 Troubleshooting by Remote Controller Display / LED Display

2.6 Troubleshooting Detail

3. Troubleshooting - Outdoor Unit Related

3.1 The Unit Runs but Doesn’t Cool (Heat) the Room

3.2 7 Seg. Display on the Outdoor P. C. Board

3.3 Troubleshooting Detail

3.4 How to Check

4. BP Unit Trouble Diagnosis

4.1 PCB Parts Layout

4.2 LED On Branch Provider Unit (Diagnosis LEDs)

Part 10 Removal Procedure

1. For BPMK928B42 · 43

1.2 Opening of Electrical Box Cover and Removal of PCB Mount

1.3 Removal of Motorized Valve

1.4 Removal of Thermistor

2. Outdoor Unit

2.1 Removal of Outer Panels

2.2 Removal of PCB and Electrical Box

2.3 Removal of Propeller Fans and Fan Motors

2.4 Removal of Thermistor

2.5 Removal of Motorized Valve

2.6 Removal of Sound Insulation

2.7 Removal of Compressor

2.8 Removal of 4-way Valve

3. Indoor Unit

3.1 Refer following table for indoor unit removal procedure

Part 11 Cautions before Operation

1. Installation

1.1 Outdoor Unit

1.2 BP Unit

2. Wiring

2.1 Outdoor Unit

2.2 BP Unit

2.3 Outdoor Unit Rotary Switch Setting

Part 12 Appendix

1.1 Outdoor Units

1.2 BP Units

1.3 Indoor Units

2.1 Outdoor Units

2.2 BP Units

2.3 Indoor Units