Daikin F-Series Service Manual
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Daikin F-Series Service Manual

Inverter multi f-series
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See also: Service Manual , Technical Manual
Service
Manual
Inverter Multi
F-Series
[Applied Models]
!Inverter Multi: Cooling only
!Inverter Multi: Heat Pump
SiEN12-710A

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Table of Contents

Troubleshooting

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Summary of Contents for Daikin F-Series

  • Page 1 SiEN12-710A Service Manual Inverter Multi F-Series [Applied Models] !Inverter Multi: Cooling only !Inverter Multi: Heat Pump...
  • Page 2 SiEN12-710A Inverter Multi F-Series !Cooling Only Outdoor Unit Indoor Unit 2MKS40FV1B FTKS25DVM FDKS25CAVMB FTKS35DVM FDKS35CAVMB FDKS25EAVMB FDKS35EAVMB !Heat Pump Outdoor Unit Indoor Unit 2MXS50FV1B FTXS25EVMA FDXS25CVMA FTXS35EVMA FDXS35CVMA CDXS25EAVMA CDXS35EAVMA Table of Contents...

  • Page 3: Table Of Contents

    SiEN12-710A 1. Introduction .....................v 1.1 Safety Cautions ..................v 1.2 Used Icons ....................ix Part 1 List of Functions ..............1 1. Cooling Only....................2 2. Heat Pump ....................4 Part 2 Specifications ..............7 1. Cooling Only....................8 1.1 Indoor Units ....................8 1.2 Outdoor Units ..................10 2.
  • Page 4 SiEN12-710A 2.12 Malfunctions ...................56 2.13 Forced Operation Mode .................57 2.14 Additional Function.................58 Part 5 Operation Manual ............. 59 1. System Configuration................60 1.1 Operation Instructions ................60 2. Instruction....................61 2.1 Manual Contents and Reference Page ..........61 2.2 Safety Precautions .................62 2.3 Names of Parts..................64 2.4 Preparation Before Operation ..............70 2.5 AUTO·DRY·COOL·HEAT·FAN Operation ..........73 2.6 Adjusting the Air Flow Direction .............75...
  • Page 5 SiEN12-710A 4.19 Radiation Fin Temperature Rise ............135 4.20 Output Over Current Detection.............137 4.21 Insufficient Gas..................139 4.22 Over-voltage Detection / Low-voltage Detection ........141 4.23 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) ............142 4.24 Outdoor Unit PCB Abnormality or Signal Transmission Circuit Abnormality..........143 5.

  • Page 6: Introduction

    SiEN12-710A Introduction 1. Introduction Safety Cautions Cautions and " Be sure to read the following safety cautions before conducting repair work. Warnings " The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely.
  • Page 7 Introduction SiEN12-710A Warning Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2m). Insufficient safety measures may cause a fall accident. In case of R410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R410A refrigerant.
  • Page 8 SiEN12-710A Introduction 1.1.2 Cautions Regarding Safety of Users Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire.
  • Page 9 Introduction SiEN12-710A Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard For unitary type installation frame.

  • Page 10: Used Icons

    SiEN12-710A Introduction Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause the water to enter the room and wet the furniture and floor.
  • Page 11 Introduction SiEN12-710A...

  • Page 12: Part 1 List Of Functions

    SiEN12-710A Part 1 List of Functions 1. Cooling Only....................2 2. Heat Pump ....................4 List of Functions...

  • Page 13: Cooling Only

    Cooling Only SiEN12-710A 1. Cooling Only Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Air Purifying Filter — — Function Clean Photocatalytic Deodorizing Filter — — Operation Limit for Cooling (°CDB) — — Air Purifying Filter with Photocatalytic —...
  • Page 14 SiEN12-710A Cooling Only Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Function Clean Air Purifying Filter — — Operation Limit for Cooling (°CDB) — Operation Limit for Heating (°CWB) — — Photocatalytic Deodorizing Filter — — Air Purifying Filter with Photocatalytic PAM Control —...

  • Page 15: Heat Pump

    Heat Pump SiEN12-710A 2. Heat Pump Category Functions Category Functions Basic Health & Inverter (with Inverter Power Control) Air Purifying Filter — — Function Clean Photocatalytic Deodorizing Filter — — Operation Limit for Cooling (°CDB) — — Air Purifying Filter with Photocatalytic —...
  • Page 16 SiEN12-710A Heat Pump Category Functions Category Functions Basic Inverter (with Inverter Power Control) Health & Function Clean Air Purifying Filter — — Operation Limit for Cooling (°CDB) — –15 Operation Limit for Heating (°CWB) — Photocatalytic Deodorizing Filter — — ~15.5 Air Purifying Filter with Photocatalytic PAM Control...
  • Page 17 Heat Pump SiEN12-710A List of Functions...

  • Page 18: Part 2 Specifications

    SiEN12-710A Part 2 Specifications 1. Cooling Only....................8 1.1 Indoor Units ....................8 1.2 Outdoor Units ..................10 2. Heat Pump ....................11 2.1 Indoor Units ....................11 2.2 Outdoor Units ..................13 Specifications...

  • Page 19: Cooling Only

    Cooling Only SiEN12-710A 1. Cooling Only Indoor Units Wall Mounted Type 50Hz 230V Model FTKS25DVM FTKS35DVM Rated Capacity 2.5kW Class 3.5kW Class Front Panel Color White White 8.7 (307) 8.9 (314) 6.7 (237) 6.9 (242) m³/min Air Flow Rates (cfm) 4.7 (166) 4.8 (169) 3.9 (138)

  • Page 20: Specifications

    SiEN12-710A Cooling Only 50Hz 230V Model FDKS25EAVMB FDKS35EAVMB Rated Capacity 2.5kW Class 3.5kW Class — — Front Panel Color 8.7 (307) 8.7 (307) 8.0 (282) 8.0 (282) m³/min Air Flow Rates (cfm) 7.3 (258) 7.3 (258) 6.2 (219) 6.2 (219) Type Sirocco Fan Sirocco Fan...

  • Page 21: Outdoor Units

    Cooling Only SiEN12-710A Outdoor Units 50Hz 230V Model 2MKS40FV1B Cooling Capacity — Power Consumption — Running Current — Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 1YC23ABXD Motor Output Model FVC50K Refrigerant Charge 0.45 Type R-410A Refrigerant Charge 1.20 m³/min...

  • Page 22: Heat Pump

    SiEN12-710A Heat Pump 2. Heat Pump Indoor Units Wall Mounted Type 50Hz 220-230-240V FTXS25EVMA FTXS35EVMA Model Cooling Heating Cooling Heating Rated Capacity 2.5kW Class 3.5kW Class Front Panel Color White White 8.7 (307) 9.4 (332) 8.9 (314) 9.7 (342) 6.7 (237) 7.6 (268) 6.9 (242) 7.9 (297)
  • Page 23 Heat Pump SiEN12-710A 50Hz 220-230-240V CDXS25EAVMA CDXS35EAVMA Model Cooling Heating Cooling Heating Rated Capacity 2.5kW Class 3.5kW Class Front Panel Color — — External Static Pressure 8.7 (307) 8.7 (307) 8.7 (307) 8.7 (307) 8.0 (282) 8.0 (282) 8.0 (282) 8.0 (282) m³/min Air Flow Rate...

  • Page 24: Outdoor Units

    SiEN12-710A Heat Pump Outdoor Units 50Hz 220-230-240V 2MXS50FV1B Model Cooling Heating — Capacity — Power Consumption — Running Current Casing Color Ivory White Type Hermetically Sealed Swing Type Compressor Model 2YC36BXD Motor Output 1,100 Model FVC50K Refrigerant Oil Charge 0.65 Type R-410A Refrigerant...
  • Page 25 Heat Pump SiEN12-710A Specifications...

  • Page 26: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiEN12-710A Part 3 Printed Circuit Board Connector Wiring Diagram 1. Printed Circuit Board Connector Wiring Diagram........16 1.1 Wall Mounted Type ................16 1.2 Duct Connected Type................18 1.3 Outdoor Unit ...................20 Printed Circuit Board Connector Wiring Diagram...

  • Page 27: Printed Circuit Board Connector Wiring Diagram

    Printed Circuit Board Connector Wiring Diagram SiEN12-710A 1. Printed Circuit Board Connector Wiring Diagram Wall Mounted Type Connectors PCB(1) (Control PCB) Connector for fan motor Connector for swing motor (horizontal blades) Connector for centralized control Connector for display PCB Connector for signal receiver PCB Connector for heat exchanger thermistor Connector for INTELLIGENT EYE sensor PCB PCB(2) (Signal Receiver PCB)
  • Page 28 SiEN12-710A Printed Circuit Board Connector Wiring Diagram PCB Detail PCB(1): Control PCB (indoor unit) +12V LED A (R6039) PCB(2): PCB(3): Signal Receiver PCB Display PCB LED1 LED2 LED3 RTH1 (R5234) (R4290) PCB(4): INTELLIGENT EYE sensor PCB (R4291) Printed Circuit Board Connector Wiring Diagram...

  • Page 29: Duct Connected Type

    Printed Circuit Board Connector Wiring Diagram SiEN12-710A Duct Connected Type Connectors PCB(1) (Control PCB) Connector for AC fan motor Connector for AC fan motor Connector for to 5 rooms centralized control Connector for display PCB Connector for heat exchanger thermistor PCB(2) (Display PCB) Connector for control PCB Note:...
  • Page 30 SiEN12-710A Printed Circuit Board Connector Wiring Diagram PCB Detail PCB (1): Control PCB (indoor unit) 2P131149 LED A PCB (2): Display PCB LED3 LED2 RTH1 LED1 2P084375 Printed Circuit Board Connector Wiring Diagram...

  • Page 31: Outdoor Unit

    Printed Circuit Board Connector Wiring Diagram SiEN12-710A Outdoor Unit Connectors PCB (1) (Control PCB) Connector for electronic expansion valve coil A port Connector for electronic expansion valve coil B port Connector for overload protector Connector for terminal strip Connector for fan motor Connector for four way valve coil Connector for thermistor (outdoor air, condenser, and discharge pipe)
  • Page 32 SiEN12-710A Printed Circuit Board Connector Wiring Diagram PCB (1): Control PCB (50 class) LED A 2P197402 Printed Circuit Board Connector Wiring Diagram...
  • Page 33 Printed Circuit Board Connector Wiring Diagram SiEN12-710A Printed Circuit Board Connector Wiring Diagram...

  • Page 34: Part 4 Function And Control

    Si12-710A Part 4 Function and Control 1. Main Functions..................24 1.1 Frequency Principle................24 1.2 Power-Airflow Dual Flaps, Wide-Angle Louvers and Auto-Swing ..26 1.3 Fan Speed Control for Indoor Units............27 1.4 Programme Dry Function ...............28 1.5 Automatic Operation................29 1.6 Thermostat Control.................30 1.7 Night Set Mode..................31 1.8 ECONO Mode ..................32 1.9 INTELLIGENT EYE ................33 1.10 HOME LEAVE Operation ...............35...

  • Page 35: Main Functions

    Main Functions SiEN12-710A 1. Main Functions Note: See the list of functions for the functions applicable to different models. Frequency Principle Main Control The compressor is frequency-controlled during normal operation. The target frequency is set by Parameters the following 2 parameters coming from the operating indoor unit: "...
  • Page 36 SiEN12-710A Main Functions Inverter Features The inverter provides the following features: " The regulating capacity can be changed according to the changes in the outdoor air temperature and cooling / heating load. " Quick heating and quick cooling The compressor rotational speed is increased when starting the heating (or cooling). This enables a quick set temperature.

  • Page 37: Power-Airflow Dual Flaps, Wide-Angle Louvers And Auto-Swing

    Main Functions SiEN12-710A Power-Airflow Dual Flaps, Wide-Angle Louvers and Auto-Swing Power-airflow The large flaps send a large volume of air downwards to the floor. The flap provides an optimum Dual Flaps control area in cooling, heating and dry mode. Heating Mode During heating mode, the large flap enables direct warm air straight downwards.

  • Page 38: Fan Speed Control For Indoor Units

    SiEN12-710A Main Functions Fan Speed Control for Indoor Units Control Mode The airflow rate can be automatically controlled depending on the difference between the set temperature and the room temperature. This is done through phase control and Hall IC control. For more information about Hall IC, refer to the troubleshooting for fan motor on page 112.

  • Page 39: Programme Dry Function

    Main Functions SiEN12-710A Programme Dry Function Programme dry function removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and air flow volume, the temperature adjustment and fan adjustment buttons are inoperable in this mode. In Case of The microcomputer automatically sets the temperature and fan settings.

  • Page 40: Automatic Operation

    SiEN12-710A Main Functions Automatic Operation Automatic Cooling / Heating Function (Heat Pump Only) When the AUTO mode is selected with the remote control, the microcomputer automatically determines the operation mode from cooling and heating according to the room temperature and setting temperature at the time of the operation startup, and automatically operates in that mode.

  • Page 41: Thermostat Control

    Main Functions SiEN12-710A Thermostat Control Thermostat control is based on the difference between the room temperature and the setpoint. Thermostat OFF Condition $ The temperature difference is in the zone A. Thermostat ON Condition $ The temperature difference is above the zone C after being in the zone A. $ The system resumes from defrost control in any zones except A.

  • Page 42: Night Set Mode

    SiEN12-710A Main Functions Night Set Mode When the OFF timer is set, the Night Set circuit automatically activates. The Night Set circuit maintains the airflow setting made by users. The Night Set The Night Set circuit continues heating or cooling the room at the set temperature for the first Circuit one hour, then automatically raises the temperature setting slightly in the case of cooling, or lowers it slightly in the case of heating, for economical operations.

  • Page 43: Econo Mode

    Main Functions SiEN12-710A ECONO Mode Outline FTKS25/35D, FTXS25/35E The "ECONO mode" reduces the maximum operating current and power consumption by approx. 30% during start up etc.. This mode is particularly convenient for energy-saving-oriented users. It is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners.

  • Page 44: Intelligent Eye

    SiEN12-710A Main Functions INTELLIGENT EYE This is the function that detects existence of humans in the room by a human motion sensor (INTELLIGENT EYE) and reduces the capacity when there is no human in the room in order to save electricity. Processing 1.
  • Page 45 Main Functions SiEN12-710A " Since the set temperature is shifted by 2°C higher for 40 minutes, compressor speed becomes low and can realize energy saving operation. But as thermostat is prone to be off by the fact that the set temperature has been shifted, the thermostat-off action is prohibited in 40 minutes so as to prevent this phenomena.

  • Page 46: Home Leave Operation

    SiEN12-710A Main Functions 1.10 HOME LEAVE Operation Outline In order to respond to the customer's need for immediate heating and cooling of the room after returning home or for house care, a measure to switch the temperature and air volume from that for normal time over to outing time by one touch is provided.

  • Page 47: Inverter Powerful Operation

    Main Functions SiEN12-710A 1.11 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Details of the When POWERFUL button is pushed in each operation mode, the fan speed / setting Control temperature will be converted to the following states in a period of 20 minutes.

  • Page 48: Other Functions

    SiEN12-710A Main Functions 1.12 Other Functions 1.12.1 Hot-Start Function Heat Pump Only In order to prevent the cold air blast that normally comes when heating is started, the temperature of the heat exchanger of the indoor unit is detected, and either the air flow is stopped or is made very weak thereby carrying out comfortable heating of the room.
  • Page 49 Main Functions SiEN12-710A 1.12.6 Self-Diagnosis Digital Display The microcomputer continuously monitors main operating conditions of the indoor unit, outdoor unit and the entire system. When an abnormality occur, the LCD remote control displays error code. These indications allow prompt maintenance operations. 1.12.7 Auto-restart Function Even if a power failure (including one for just a moment) occurs during the operation, the operation restarts in the condition before power failure automatically when power is restored.

  • Page 50: Function Of Thermistor

    SiEN12-710A Main Functions 1.13 Function of Thermistor 1.13.1 Heat Pump Model Expansion valve Four way valve (R7042) Compressor A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger The system sets a target discharge temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the Thermistor target discharge temperature can be obtained.
  • Page 51 Main Functions SiEN12-710A D Indoor Heat 1. The indoor heat exchanger thermistors are used for controlling target discharge temperature. Exchanger The system sets a target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that Thermistor the target discharge temperature can be obtained.

  • Page 52: Cooling Only Model

    SiEN12-710A Main Functions 1.13.2 Cooling Only Model Expansion valve Compressor (R4688) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger The system sets a target discharge temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the Thermistor target discharge temperature can be obtained.

  • Page 53: Control Specification

    Control Specification SiEN12-710A 2. Control Specification Mode Hierarchy Outline There are two modes; the mode selected in user’s place (normal air conditioning mode) and forced operation mode for installation and providing service. Detail 1. For heat pump model There are following modes; stop, cooling (includes drying), heating (include defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)

  • Page 54: Frequency Control

    SiEN12-710A Control Specification Frequency Control Outline Frequency that corresponds to each room’s capacity will be determined according to the difference in the temperature of each room and the temperature that is set by the remote control. The function is explained as follows. 1.
  • Page 55 Control Specification SiEN12-710A For Cooling Only Model 1. Determine command frequency $ Command frequency will be determined in the following order of priority. 1.1 Limiting frequency by drooping function $ Input current, discharge pipes, freeze prevention, dew prevention, fin thermistor temperature.
  • Page 56 SiEN12-710A Control Specification 3. Limit of frequency variation width When the difference between input current and input current drooping value is less than 1 A, the frequency increase width must be limited. 4. Frequency management when other controls are functioning $ When each frequency is drooping;...

  • Page 57: Controls At Mode Changing / Start-Up

    Control Specification SiEN12-710A Controls at Mode Changing / Start-up 2.3.1 Preheating Operation Outline Operate the inverter in the open phase operation with the conditions including the preheating command from the indoor, the outdoor air temperature and discharge pipe temperature. Detail Preheating ON Condition $ When outdoor air temperature is below 10.5ºC and discharge pipe temperature is below 10.5ºC, inverter in open phase operation starts.

  • Page 58: Compressor Protection Function

    SiEN12-710A Control Specification 2.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows. (The function must not be used when defrosting (only for heat pump model).) 40 class 50 class Frequency FCG 3 FCG3...

  • Page 59: Discharge Pipe Temperature Control

    Control Specification SiEN12-710A Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the compressor's internal temperature. If the discharge pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this temperature from going up further. Detail Divide the Zone Stop zone...

  • Page 60: Freeze-Up Protection Control

    SiEN12-710A Control Specification Freeze-up Protection Control Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from the indoor unit must be divided into the zones as the followings. Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature after 2 sec from...

  • Page 61: Fan Control

    Control Specification SiEN12-710A Fan Control Outline Fan control is carried out according to the following conditions. 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. ON/OFF control when cooling operation 5.

  • Page 62: Defrost Control

    SiEN12-710A Control Specification 2.10 Defrost Control Outline Heat Pump Only Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than its fixed value when finishing. Detail Conditions for Starting Defrost The starting conditions must be made with the outdoor air temperature and heat exchanger temperature.

  • Page 63: Electronic Expansion Valve Control

    Control Specification SiEN12-710A 2.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Room Distribution Control 1.
  • Page 64 SiEN12-710A Control Specification Detail The followings are the examples of control which function in each mode by the electronic expansion valve control. Operation pattern : function × : not function When power is turned ON × × × × × ×...
  • Page 65 Control Specification SiEN12-710A 2.11.1 Fully Closing with Power On Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 2.11.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
  • Page 66 SiEN12-710A Control Specification Detail Detect Disconnection If a 780-second timer for open control becomes over, the following adjustment must be made. 1. When the operation mode is cooling When the discharge pipe temperature is lower than the outdoor heat exchanger temperature, the discharge pipe thermistor disconnection must be ascertained.

  • Page 67: Malfunctions

    Control Specification SiEN12-710A 2.12 Malfunctions 2.12.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Fin thermistor 4. Gas pipe thermistor 5.

  • Page 68: Forced Operation Mode

    SiEN12-710A Control Specification Detail Judgment by Input Current When an output frequency is exceeds 51 Hz (40 class) or 48 Hz (50 class) and the input current is less than specified value, the adjustment is made for insufficient gas. Judgment by Discharge Pipe Temperature When discharge pipe temperature is higher than 101°C, the electronic expansion value opening is 450 plus (max.) and the adjustment is made for insufficient gas.

  • Page 69: Additional Function

    Control Specification SiEN12-710A 2.14 Additional Function 2.14.1 POWERFUL Operation Mode Compressor operating frequency and outdoor unit airflow rate are increased. 2.14.2 Voltage Detection Function Power supply voltage is detected each time equipment operation starts. Function and Control...

  • Page 70: Part 5 Operation Manual

    SiEN12-710A Part 5 Operation Manual 1. System Configuration................60 1.1 Operation Instructions ................60 2. Instruction....................61 2.1 Manual Contents and Reference Page ..........61 2.2 Safety Precautions .................62 2.3 Names of Parts..................64 2.4 Preparation Before Operation ..............70 2.5 AUTO·DRY·COOL·HEAT·FAN Operation ..........73 2.6 Adjusting the Air Flow Direction .............75 2.7 POWERFUL Operation ................77 2.8 OUTDOOR UNIT QUIET Operation............78 2.9 ECONO Operation .................79...

  • Page 71: System Configuration

    System Configuration SiEN12-710A 1. System Configuration Operation Instructions After the installation and test operation of the room air conditioner have been completed, it should be operated and handled as described below. Every user would like to know the correct method of operation of the room air conditioner, to check if it is capable of cooling (or heating) well, and to know a clever method of using it.

  • Page 72: Instruction

    SiEN12-710A Instruction 2. Instruction Manual Contents and Reference Page Wall Mounted Type Model Series FTKS25/35D FTXS25/35E Read Before Operation Safety Precautions Names of Parts Preparation Before Operation H Operation AUTO, DRY, COOL, HEAT, FAN Operation H Adjusting the Air Flow Direction POWERFUL Operation H OUTDOOR UNIT QUIET Operation H ECONO Operation...

  • Page 73: Safety Precautions

    Do not attempt to repair, relocate, modify or reinstall the air conditioner by yourself. Incorrect work will cause electric shocks, fire etc. For repairs and reinstallation, consult your Daikin dealer for advice and information. • The refrigerant used in the air conditioner is safe. Although leaks should not occur, if for some reason any refrigerant happens to leak into the room, make sure it does not come in contact with any flame as of gas heaters, kerosene heaters or gas range.

  • Page 74: Installation Site

    SiEN12-710A Instruction • Do not place appliances which produce open fire in places exposed to the air flow from the unit or under the indoor unit. It may cause incomplete combustion or deformation of the unit due to the heat. •...

  • Page 75: Names Of Parts

    Instruction SiEN12-710A Names of Parts FTKS 25/35 D, FTXS 25/35 E " Indoor unit Operation Manual...
  • Page 76 SiEN12-710A Instruction " Outdoor unit " Indoor Unit 1. Air filter 12. Indoor Unit ON/OFF switch: 2. Titanium Apatite Photocatalytic • Push this switch once to start operation. Air-Purifying Filter: Push once again to stop it. • These filters are attached to the inside of •...

  • Page 77: Remote Control

    Instruction SiEN12-710A " Remote control ECONO ON/OFF TEMP POWERFUL MODE SWING QUIET MOLD PROOF SENSOR CANCEL TIMER <ARC433B46, B47> 1. Signal transmitter: 8. QUIET button: • It sends signals to the indoor unit. OUTDOOR UNIT QUIET OPERATION 2. Display: 9. FAN setting button: •...
  • Page 78 SiEN12-710A Instruction FDK(X)S 25/35 C, FDKS 25/35 E, CDXS 25/35 E " Indoor unit Operation Manual...
  • Page 79 Instruction SiEN12-710A " Outdoor Unit " Indoor Unit 1. Air outlet 10. Indoor Unit ON/OFF switch: 2. Air outlet grille: (Field supply) • Push this switch once to start operation. • Appearance of the Air outlet grille and Air Push once again to stop it. inlet grille may differ with some models.
  • Page 80 SiEN12-710A Instruction " Remote control 〈 ARC433B69, B76 〉 1. Signal transmitter: 7. MODE selector button: • It sends signals to the indoor unit. • It selects the operation mode. 2. Display: (AUTO/DRY/COOL/HEAT/FAN) • It displays the current settings; 8. QUIET button: OUTDOOR UNIT QUIET (In this illustration, each section is shown operation with all its displays ON for the purpose of...

  • Page 81: Preparation Before Operation

    Instruction SiEN12-710A Preparation Before Operation " To set the batteries 1. Slide the front cover to take it off. 2. Set two dry batteries (AAA). Position 3. Set the front cover as before. correctly! ATTENTION " About batteries • When replacing the batteries, use batteries of the same type, and replace the two old batteries together. •...
  • Page 82 SiEN12-710A Instruction " To operate the remote control • To use the remote control, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote control, such as a curtain, the unit will not operate. •...

  • Page 83: To Set The Clock

    Instruction SiEN12-710A " To set the clock 1. Press “CLOCK button”. 0:00 is displayed. blinks. 2. Press “TIMER setting button” to set the clock to the present time. Holding down “ ” or “ ” button rapidly increases or decreases the time display. 3.

  • Page 84: Auto·dry·cool·heat·fan Operation

    SiEN12-710A Instruction AUTO·DRY·COOL·HEAT·FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. " To start operation 1. Press “MODE selector button” and select a operation mode.

  • Page 85: To Change The Air Flow Rate Setting

    Instruction SiEN12-710A " To change the air flow rate setting 5. Press “FAN setting button”. DRY mode AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ “ to “ ” plus “ ”...

  • Page 86: Adjusting The Air Flow Direction

    SiEN12-710A Instruction Adjusting the Air Flow Direction FTKS 25/35 D, FTXS 25/35 E You can adjust the air flow direction to increase your comfort. " To adjust the horizontal blades (flaps) 1. Press “SWING button”. • “ “ is displayed on the LCD and the flaps will begin to swing.
  • Page 87 Instruction SiEN12-710A " To adjust the vertical blades (louvers) Hold the knob and move the louvers. (You will find a knob on the left-side and the right-side blades.) • When the unit is installed in the corner of a room, the direction of the louvers should be facing away from the wall.If they face the wall, the wall will block off the wind, causing the cooling (or heating) efficiency to drop...

  • Page 88: Powerful Operation

    SiEN12-710A Instruction POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. " To start POWERFUL operation 1. Press “POWERFUL button”. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the settings which were used before POWERFUL operation.

  • Page 89: Outdoor Unit Quiet Operation

    Instruction SiEN12-710A OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. " To start OUTDOOR UNIT QUIET operation 1.

  • Page 90: Econo Operation

    SiEN12-710A Instruction ECONO Operation ECONO operation is a function which enables efficient operation by lowering the maximum power consumption value. " To start ECONO operation 1. Press “ECONO button” . • “ ” is displayed on the LCD. " To cancel ECONO operation 2.

  • Page 91: Home Leave Operation

    Instruction SiEN12-710A 2.10 HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and air flow rate settings. " To start HOME LEAVE operation 1. Press “HOME LEAVE button” . • “ ” is displayed on the LCD. •...
  • Page 92 SiEN12-710A Instruction " What’s the HOME LEAVE operation Is there a set temperature and air flow rate which is most comfortable, a set temperature and air flow rate which you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and air flow rate.

  • Page 93: Mold Proof Operation

    Instruction SiEN12-710A 2.11 MOLD PROOF Operation MOLD PROOF operation is a function which reduces the spread of mold by using Fan mode to lower the humidity inside the indoor unit. " To start MOLD PROOF operation 1. Press and hold the “MOLD PROOF button”...

  • Page 94: Intelligent Eye Operation

    SiEN12-710A Instruction 2.12 INTELLIGENT EYE Operation “INTELLIGENT EYE” is the infrared sensor which detects the human movement. " To start INTELLIGENT EYE operation 1. Press “SENSOR button”. • “ ” is displayed on the LCD. " To cancel the INTELLIGENT EYE operation 2.
  • Page 95 Instruction SiEN12-710A “INTELLIGENT EYE” is useful for Energy Saving " Energy saving operation • Change the temperature –2°C in heating / +2°C in cooling / +2°C in dry mode from set temperature. • Decrease the air flow rate slightly in fan operation. (In FAN mode only) Notes on “INTELLIGENT EYE”...

  • Page 96: Timer Operation

    SiEN12-710A Instruction 2.13 TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. " To use OFF TIMER operation •...

  • Page 97: To Use On Timer Operation

    Instruction SiEN12-710A " To use ON TIMER operation • Check that the clock is correct.If not, set the clock to the present time. 1. Press “ON TIMER button”. 6:00 is displayed. blinks. 2. Press “TIMER Setting button” until the time setting reaches the point you like. •...

  • Page 98: Note For Multi System

    SiEN12-710A Instruction 2.14 Note for Multi System << What is a “Multi System”? >> This system has one outdoor unit connected to multiple indoor units. " Selecting the Operation Mode 1. With the Priority Room Setting present but inactive or not present When more than one indoor unit is operating, priority is given to the first room unit that was turned on.

  • Page 99: Priority Room Setting

    Instruction SiEN12-710A " Priority Room Setting The Priority Room Setting requires initial programming during installation. Please consult your retailer or dealer for assistance. The room designated as the Priority Room takes priority in the following situations; 1. Operation Mode Priority. As the operation mode of the Priority Room takes precedence, the user can select a different operation mode from other rooms.

  • Page 100: Care And Cleaning

    SiEN12-710A Instruction 2.15 Care and cleaning FTKS 25/35 D, FTXS 25/35 E CAUTION Before cleaning, be sure to stop the operation and turn the breaker OFF. UNITS " Indoor unit, Outdoor unit and Remote control 1.Wipe them with dry soft cloth. "...

  • Page 101: Air Filter

    Instruction SiEN12-710A FILTERS 1. Open the front panel. 2. Pull out the air filters. • Push a little upwards the tab at the center of each air filter, then pull it down. 3. Take off the Titanium Apatite Photocatalytic Air-Purifying Filter . Titanium Apatite •...

  • Page 102: Before A Long Idle Period

    SiEN12-710A Instruction NOTE • Operation with dirty filters : (1) cannot deodorize the air. (2) cannot clean the air. (3) results in poor heating or cooling. (4) may cause odour. • To order Titanium Apatite Photocatalytic Air-Purifying Filter contact to the service shop there you bought the air conditioner.

  • Page 103: Cleaning The Air Filter

    Instruction SiEN12-710A FDK(X)S 25/35 C, FDKS 25/35 E CAUTION Only a qualified service person is allowed to perform maintenance. Before cleaning, be sure to stop the operation and turn the breaker OFF. " Cleaning the air filter 1. Removing the air filter •...
  • Page 104 • Clean the drain pan periodically, or drain piping may be clogged with dust and may result in water leakage.Ask your DAIKIN dealer to clean them. • Prepare a cover locally to prevent any dust in the air around the indoor unit from getting in the drain pan, if there is a great deal of dust present.
  • Page 105 Instruction SiEN12-710A CDXS 25/35 E CAUTION • Only a qualified service person is allowed to perform maintenance. • Before cleaning, be sure to stop the operation and turn the breaker OFF. " Cleaning the air filter 1. Removing the air filter •...
  • Page 106 Do not use water or air of 50°C or higher for cleaning air filters and outside panels. • Ask your DAIKIN dealer how to clean it. Check Check that the base, stand and other fittings of the outdoor unit are not decayed or corroded.

  • Page 107: Troubleshooting

    Instruction SiEN12-710A 2.16 Troubleshooting These cases are not troubles. The following cases are not air conditioner troubles but have some reasons. You may just continue using it. Case Explanation Operation does not start soon. • This is to protect the air conditioner. •...

  • Page 108: Check Again

    SiEN12-710A Instruction Check again. Please check again before calling a repair person. Case Check The air conditioner does not operate. • Hasn’t a breaker turned OFF or a fuse blown? (OPERATION lamp is off) • Isn’t it a power failure? •...
  • Page 109 Instruction SiEN12-710A Call the service shop immediately. WARNING " When an abnormality (such as a burning smell) occurs, stop operation and turn the breaker OFF. Continued operation in an abnormal condition may result in troubles, electric shocks or fire. Consult the service shop where you bought the air conditioner. "...

  • Page 110: Fault Diagnosis

    SiEN12-710A Instruction Fault diagnosis FAULT DIAGNOSIS BY REMOTE CONTROL In the ARC433A series, the temperature display sections on the main unit indicate corresponding codes. 1. When the TIMER CANCEL button is held down for 5 seconds, a “00” indication flashes on the temperature display section.
  • Page 111 Instruction SiEN12-710A Operation Manual...

  • Page 112: Part 6 Service Diagnosis

    SiEN12-710A Part 6 Service Diagnosis 1. Caution for Diagnosis................102 2. Problem Symptoms and Measures .............104 3. Service Check Function ..............105 3.1 Check Method 1 ...................105 3.2 Check Method 2 ...................106 4. Troubleshooting ..................108 4.1 Error Codes and Description ..............108 4.2 Indoor Unit PCB Abnormality ...............109 4.3 Freeze-up Protection Control or High Pressure Control.......110 4.4 Fan Motor or Related Abnormality ............112 4.5 Thermistor or Related Abnormality (Indoor Unit)........115...

  • Page 113: Caution For Diagnosis

    Caution for Diagnosis SiEN12-710A 1. Caution for Diagnosis The operation lamp flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.
  • Page 114 SiEN12-710A Caution for Diagnosis Troubleshooting Outdoor Unit with the LED There is a green LED on the PCB. The flashing green LED indicates normal equipment Indication condition. (Troubleshooting with the green LED) The LED A of the outdoor unit indicate microcomputer operation condition. Even after the error is cancelled and the equipment operates in normal condition, the LED indication remains.

  • Page 115: Problem Symptoms And Measures

    Problem Symptoms and Measures SiEN12-710A 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page None of the Units Check the power supply. Check to make sure that the rated voltage is — Operates. supplied. Check the type of the indoor units. Check to make sure that the indoor unit type is —...

  • Page 116: Service Check Function

    SiEN12-710A Service Check Function 3. Service Check Function Check Method 1 The temperature display sections on the main unit indicate corresponding codes. ARC433 Series 1. When the timer cancel button is held down for 5 seconds, a “00” indication flashes on the temperature display section.

  • Page 117: Check Method 2

    Service Check Function SiEN12-710A Check Method 2 1. Enter the diagnosis mode. Press the 3 buttons (TEMP s ,TEMP t , MODE) simultaneously. (R4272) The digit of the number of tens blinks. HTry again from the start when the digit does not blink. (R4273) 2.
  • Page 118 SiEN12-710A Service Check Function 5. Press the TEMP button. Press TEMP s or TEMP t and change the digit until you hear the sound of “beep”. (R4277) 6. Diagnose by the sound. H“pi” : The both numbers of tens and units do not accord with the error code. H“pi pi”...

  • Page 119: Troubleshooting

    Troubleshooting SiEN12-710A 4. Troubleshooting Error Codes and Description Reference Code Indication Description Page System Normal — Insufficient gas Over-voltage detection / low-voltage detection Outdoor unit PCB abnormality or signal transmission circuit abnormality Unspecified voltage (between indoor and outdoor units) Anti-icing function in other rooms Indoor Indoor unit PCB abnormality Unit...

  • Page 120: Indoor Unit Pcb Abnormality

    SiEN12-710A Troubleshooting Indoor Unit PCB Abnormality Remote Control Display Method of Evaluation of zero-cross detection of power supply by indoor unit. Malfunction Detection Malfunction When there is no zero-cross detection in approximately 10 continuous seconds. Decision Conditions Supposed " Faulty indoor unit PCB Causes "...

  • Page 121: Freeze-Up Protection Control Or High Pressure Control

    Troubleshooting SiEN12-710A Freeze-up Protection Control or High Pressure Control Remote Control Display Method of " High pressure control (heat pump model only) Malfunction During heating operations, the temperature detected by the indoor heat exchanger thermistor is used for the high pressure control (stop, outdoor fan stop, etc.) Detection "...
  • Page 122 SiEN12-710A Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Check the air passage. Refer to P.149 Is there any short-circuit? Provide sufficient air passage. Check the intake air filter. Is it very dirty? Clean the air filter.

  • Page 123: Fan Motor Or Related Abnormality

    Troubleshooting SiEN12-710A Fan Motor or Related Abnormality 4.4.1 AC Motor Remote Control Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction When the detected rotation speed does not reach the demanded rotation speed of the target Decision tap, and is less than 50% of the maximum fan motor rotation speed.

  • Page 124: Dc Motor

    SiEN12-710A Troubleshooting 4.4.2 DC Motor Remote Control Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation. Detection Malfunction When the detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
  • Page 125 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.01 Turn off power supply and rotate fan by hand. Refer to P.146 Does fan rotate smoothly? Replace fan motor.

  • Page 126: Thermistor Or Related Abnormality (Indoor Unit)

    SiEN12-710A Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4, C9 Remote Control Display Method of The temperatures detected by the thermistors are used to determine thermistor errors. Malfunction Detection Malfunction When the thermistor input is more than 4.96 V or less than 0.04 V during compressor Decision operation∗.

  • Page 127: Front Panel Open / Close Fault

    Troubleshooting SiEN12-710A Front Panel Open / Close Fault Remote Control Display Method of Malfunction Detection Malfunction " The system will be shut down when the error occurs twice. Decision Conditions Supposed " Malfunction of the reduction motor Causes " Malfunction or deterioration of the front panel mechanism "...

  • Page 128: Freeze-Up Protection Control

    SiEN12-710A Troubleshooting Freeze-up Protection Control Remote Control Display Method of Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by the indoor unit heat exchanger thermistor and room temperature thermistor that are located in a Malfunction shut-down room.
  • Page 129 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Check the wiring and piping Refer to P.146 Check No.06 Correct the wiring or piping Wiring or piping out of spec? error.

  • Page 130: Ol Activation (Compressor Overload)

    SiEN12-710A Troubleshooting OL Activation (Compressor Overload) Remote Control Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction " If the compressor OL is activated twice, the system will be shut down. Decision " The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

  • Page 131: Compressor Lock

    Troubleshooting SiEN12-710A Compressor Lock Remote Control Display Method of Judging from current waveform generated when high-frequency voltage is applied to the Malfunction compressor. Detection Malfunction " The system will be shut down if the error occurs 16 times. Decision " Clearing condition: Continuous run for about 11 minutes (normal) Conditions Supposed "...

  • Page 132: Dc Fan Lock

    SiEN12-710A Troubleshooting 4.10 DC Fan Lock Remote Control Display Method of A fan motor or related error is detected by checking the high-voltage fan motor rpm being Malfunction detected by the Hall IC. Detection Malfunction " The fan does not start in 60 seconds even when the fan motor is running. Decision "...

  • Page 133: Input Over Current Detection

    Troubleshooting SiEN12-710A 4.11 Input Over Current Detection Remote Control Display Method of An input over-current is detected by checking the power consumption value of outdoor unit with Malfunction the compressor running. Detection Malfunction " The following input value (calculated from power consumption of outdoor unit) with the Decision compressor running continues for 2.5 seconds.
  • Page 134 SiEN12-710A Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.07 * An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, Refer to P.150 check the wires again.

  • Page 135: Discharge Pipe Temperature Control

    Troubleshooting SiEN12-710A 4.12 Discharge Pipe Temperature Control Remote Control Display Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the Malfunction temperature being detected by the discharge pipe thermistor. Detection Malfunction If the temperature being detected by the discharge pipe thermistor rises, the compressor will Decision stop.

  • Page 136: High Pressure Control In Cooling

    SiEN12-710A Troubleshooting 4.13 High Pressure Control in Cooling Remote Control Display Method of High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the Malfunction temperature being sensed by the heat exchanger thermistor exceeds the limit. Detection Malfunction "...
  • Page 137 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.146 Check the installation space. Check No.06 Check No. 07 Abnormal Check the installation Change the air outlet grille Refer to P.149 condition.

  • Page 138: Compressor Sensor System Abnormality

    SiEN12-710A Troubleshooting 4.14 Compressor Sensor System Abnormality Remote Control Display Method of Fault condition is identified by DC current which is detected before compressor startup. Malfunction Detection Malfunction " When the DC current before compressor startup is other than 0.5 to 4.5 V (detected by Decision converting the sensor output to voltage), or the DC voltage is 50 V or less.

  • Page 139: Position Sensor Abnormality

    Troubleshooting SiEN12-710A 4.15 Position Sensor Abnormality Remote Control Display Method of A compressor startup failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection Malfunction " The compressor is not running in about 15 seconds after the compressor run command Decision signal is sent.
  • Page 140 SiEN12-710A Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.08 Check the power supply Refer to P.151 Check No. 08 Check No.13 Check the discharge pressure. Refer to P.153 Abnormal Judgement...

  • Page 141: Dc Voltage / Dc Current Sensor Abnormality

    Troubleshooting SiEN12-710A 4.16 DC Voltage / DC Current Sensor Abnormality Remote Control Display Method of DC voltage or DC current sensor system fault is identified based on the compressor operation Malfunction frequency and the input current detected by the product of DC current and DC voltage. Detection Malfunction When the compressor operation frequency is more than 52 Hz...

  • Page 142: Thermistor Or Related Abnormality (Outdoor Unit)

    SiEN12-710A Troubleshooting 4.17 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, J8, J9, H9 Remote Control Display Method of This type of error is detected by checking the thermistor input voltage to the microcomputer. Malfunction [A thermistor error is detected by checking the temperature.] Detection Malfunction The thermistor input is above 4.98 V or below 0.02 V with the power on for 5 seconds.
  • Page 143 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 Turn on the power again. Refer to P.149 Error displayed again on Reconnect. remote control? Connector or thermistor Reconnect.

  • Page 144: Electrical Box Temperature Rise

    SiEN12-710A Troubleshooting 4.18 Electrical Box Temperature Rise Remote Control Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction " With the compressor off, the radiation fin temperature is above 80°C. Decision "...
  • Page 145 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.06 (Precaution before turning on the power again) Refer to P.149 Make sure the power has been off for at least 30 seconds. WARNING Turn off the power and turn it on again.

  • Page 146: Radiation Fin Temperature Rise

    SiEN12-710A Troubleshooting 4.19 Radiation Fin Temperature Rise Remote Control Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is above 93°C, Decision "...
  • Page 147 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before WARNING Caution connect or disconnect connector, or Check No.06 To cool down the electricals, the parts damage may be occurred. outdoor unit fan gets started when Refer to P.149 (Precaution before turning on the power again) the radiation fin temperature rises Make sure the power has been off...

  • Page 148: Output Over Current Detection

    SiEN12-710A Troubleshooting 4.20 Output Over Current Detection Remote Control Display Method of An output over-current is detected by checking the current that flows in the inverter DC section. Malfunction Detection Malfunction " A position signal error occurs while the compressor is running. Decision "...
  • Page 149 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and Check No.07 reconnected for part replacement, for example, and the system is interrupted by an input over-current, Refer to P.150 check the wires again.

  • Page 150: Insufficient Gas

    SiEN12-710A Troubleshooting 4.21 Insufficient Gas Remote Control Display Method of Gas shortage detection I : Malfunction A gas shortage is detected by checking the power consumption value and the compressor running frequency. Detection Malfunction Gas shortage detection I : Decision Power consumption <...
  • Page 151 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.04 Refer to P.146 Any thermistor disconnected? Replace in position. * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.06 * Outdoor air thermistor...

  • Page 152: Over-Voltage Detection / Low-Voltage Detection

    SiEN12-710A Troubleshooting 4.22 Over-voltage Detection / Low-voltage Detection Remote Control Display Method of An abnormal voltage rise (or drop) is detected by checking the detection circuit or DC voltage Malfunction detection circuit. Detection Malfunction " An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or Decision the voltage being detected by the DC voltage detection circuit is judged to be below 150V for 0.1 second.

  • Page 153: Anti-Icing Function In Other Rooms / Unspecified Voltage (Between Indoor And Outdoor Units)

    Troubleshooting SiEN12-710A 4.23 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) UA, UH Remote Control Display Method of A wrong connection is detected by checking the combination of indoor and outdoor units on the Malfunction microcomputer.

  • Page 154: Outdoor Unit Pcb Abnormality Or Signal Transmission Circuit Abnormality

    SiEN12-710A Troubleshooting 4.24 Outdoor Unit PCB Abnormality or Signal Transmission Circuit Abnormality Remote Control Display Method of 1. Detect within the programme of the microcomputer that the programme is operating Malfunction normally. 2. When indoor-outdoor unit signal transmission can not be performed for more than 15 sec. Detection 3.
  • Page 155 Troubleshooting SiEN12-710A Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check indoor unit also, because a comunication circuit fault may be caused by the problem related to the indoor unit. Check supply voltage Rated voltage? Rectify the power supply.
  • Page 156 SiEN12-710A Troubleshooting Continued from the previous page Check No.10 Refer to P.151 Does LED A turn off? Check grounding Grounded? Carry out grounding work. The cause seems to be an Check No. 10 external factor other than Check the power supply failure of the outdoor unit waveform.

  • Page 157: Check

    Check SiEN12-710A 5. Check How to Check 5.1.1 Fan Motor Connector Output Check Check No.01 1. Check connector connection. 2. Check motor power supply voltage output (pins 4-7). 3. Check motor control voltage (pins 4-3). 4. Check rotation command voltage output (pins 4-2). 5.
  • Page 158 SiEN12-710A Check Valve Body Condition (Symptom) Check Method / Measure (1) Valve body catches at fully opened or half Reset power supply and conduct cooling opened position. operation unit by unit. (Symptom) Cooling: Check the liquid pipe temperature "Water leakage at the no-operation unit of no-operation unit.

  • Page 159: Four Way Valve Performance Check

    Check SiEN12-710A 5.1.4 Four Way Valve Performance Check Check No.05 Turn off the power and turn it on again. * Four way valve coil Start the heating-mode run. Cooling / dry : No continuity Heating : Continuity S80 voltage at DC 220-240 V with Replace the outdoor unit compressor on? (Fig.

  • Page 160: Thermistor Resistance Check

    SiEN12-710A Check 5.1.5 Thermistor Resistance Check Check No.06 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below.

  • Page 161: Installation Condition Check

    Check SiEN12-710A 5.1.6 Installation Condition Check Check No.07 Installation condition check Check the allowable dimensions Abnormal Change the position of the air of the air suction and discharge discharge grille or the area. installation location. Normal Does the discharged air from other outdoor Change the position of the air unit cause an increase of the discharge grille or the...

  • Page 162: Discharge Pressure Check

    SiEN12-710A Check 5.1.7 Discharge Pressure Check Check No.08 Discharge pressure check High Replace compessor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the pipe installed at deformed? the site. Dirty Are the heat exchanger and Clean.

  • Page 163: Capacitor Voltage Check

    Check SiEN12-710A 5.1.10 Inverter Units Refrigerant System Check Check No.11 Refrigerant system check Is the discharge Correct the problem. thermister disconnected from the Is the temperature of the four way valve suction Four way valve defective. pipe abnormaly Replace the four way valve. high? Is any moisture found in sight...

  • Page 164: Power Transistor Check

    SiEN12-710A Check 5.1.12 Power Transistor Check Check No.13 " Checking the power transistor ! Never touch any live parts for at least 10 minutes after turning off the circuit breaker. ! If unavoidably necessary to touch a live part, make sure the power transistor's supply voltage is below 50 V using the tester.

  • Page 165: Hall Ic Check

    Check SiEN12-710A 5.1.14 Turning Speed Pulse Input on the Outdoor Unit PCB Check Check No.15 <Propeller fan motor> Make sure the voltage of 270±30V is being applied. (1) Stop the operation first and then the power, and disconnect the connector S70. (2) Make sure there is about DC 270 V between pins 4 and 7.

  • Page 166: Part 7 Removal Procedure

    SiEN12-710A Part 7 Removal Procedure 1. Outdoor Unit..................156 1.1 Removal of the Panels and Plates ............156 1.2 Removal of the Electrical Box ..............158 1.3 Removal of the PCB................163 1.4 Removal of the Sound Blanket.............168 1.5 Removal of the Propeller Fan / Fan Motor ...........170 1.6 Removal of the Thermistors ..............173 1.7 Removal of the Compressor..............175 1.8 Removal of the Four Way Valve •...

  • Page 167: Outdoor Unit

    Outdoor Unit SiEN12-710A 1. Outdoor Unit Removal of the Panels and Plates Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step External appearance. Handle Manufacturer's label (R7570) φ6.4 Flare connection...
  • Page 168 SiEN12-710A Outdoor Unit Step Procedure Points Loosen the 4 screws " When reassembling, make and remove the sure to fit the 4 hooks. discharge grille. (R7700) Loosen the 2 screws of " The stop valve cover is the stop valve cover united with the shelter.

  • Page 169: Removal Of The Electrical Box

    Outdoor Unit SiEN12-710A Removal of the Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Disconnect the " Fasten the wires with screws connecting wires on the terminal board.
  • Page 170 SiEN12-710A Outdoor Unit Step Procedure Points Disconnect the " For removal procedure of the connector for the fan lead wire for the fan motor, [S70] motor [S70]. refer to “Removal of the PCB”. (R7578) Detach the lead wire for the fan motor. (R7579) Disconnect the [S91] : Gas pipe thermistor...
  • Page 171 Outdoor Unit SiEN12-710A Step Procedure Points Disconnect the [S20] : Electronic expansion connectors [S20], [S21] valve EVA [S20] [S21] [S80] and [S80]. [S21] : Electronic expansion valve EVB [S80] : Four way valve (R7582) Undo the wire clip from " The clip is push-mount type. the electrical box.
  • Page 172 SiEN12-710A Outdoor Unit Step Procedure Points Detach the discharge " Meet the edge of the pipe thermistor. thermistor and the clip. " Be careful not to lose the clip for the discharge pipe Clip for discharge pipe thermistor thermistor. Discharge pipe thermistor (R7586) Disconnect the [S90] : Thermistor ASSY...
  • Page 173 Outdoor Unit SiEN12-710A Step Procedure Points Loosen the screw in front of the electrical box. (R7590) Lift up the electrical box to remove. (R7591) Removal Procedure...

  • Page 174: Removal Of The Pcb

    SiEN12-710A Outdoor Unit Removal of the PCB Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step " Remove the outer panels Preparation Electrical box (cover) and plates such as the top "...
  • Page 175 Outdoor Unit SiEN12-710A Step Procedure Points Loosen the 2 screws and detach the 1 clip to Temperature fuse harness remove the radiation shield plate. Radiation shield plate (2) (R7600) Compressor harness Clip Hole (R7596) " The clip is push mount type. (R7601) Cut off the clamp and disconnect the wire...
  • Page 176 SiEN12-710A Outdoor Unit Step Procedure Points Loosen the 7 screws in total to remove the PCB. (R7598) (R7602) Lift up the back side " Make sure that the hooks of slightly and undo the the electrical box are placed hooks of the front. on the PCB.
  • Page 177 Outdoor Unit SiEN12-710A Step Procedure Points (R7605) Lift up the control PCB to remove. (R7606) Detach the faston " See page 20 for detail. terminals from the [S70] [S40] [S92] [S91] [S20] [S21] temperature fuse and [S90] [S80] each terminal board. (R7607) [S20] : Electronic expansion valve EVA...
  • Page 178 SiEN12-710A Outdoor Unit Step Procedure Points Loosen the 2 screws of the radiation fin. (R7608) (R7609) Removal Procedure...

  • Page 179: Removal Of The Sound Blanket

    Outdoor Unit SiEN12-710A Removal of the Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step " Remove the electrical box 1. Remove the right side panel Loosen the 6 screws to remove the right side...
  • Page 180 SiEN12-710A Outdoor Unit Step Procedure Points 3. Remove the sound blanket Undo the fixing strings, open the sound blanket (body) and pull it out. (R7613) Lift up the sound " Since the piping ports are blanket (top-upper) to torn easily, remove the remove.

  • Page 181: Removal Of The Propeller Fan / Fan Motor

    Outdoor Unit SiEN12-710A Removal of the Propeller Fan / Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Remove the propeller fan Loosen the washer fitted nut (M10) by an open-ended spanner to remove the propeller...
  • Page 182 SiEN12-710A Outdoor Unit Step Procedure Points The figure shows the arrangement of the fan motor lead wire. (R7622) Loosen the 1 screw to " When assembling, make remove the fan motor sure ! mark of the fan motor fixing plate. goes down.
  • Page 183 Outdoor Unit SiEN12-710A Step Procedure Points Turn the fun motor fixing plate backward and undo the 2 fixing hooks of the lead wire. (R7626) Release the fan motor " When assembling, put the lead wire. lead wire through the back of the motor (so as not to be entangled with the propeller fan).

  • Page 184: Removal Of The Thermistors

    SiEN12-710A Outdoor Unit Removal of the Thermistors Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Remove the assembly of " Be careful not to lose the clip thermistor for the discharge pipe thermistor.
  • Page 185 Outdoor Unit SiEN12-710A Step Procedure Points Cut off the clamp. (R7634) Open the putty and remove the each Thermistor (Liquid) thermistor. Room A [S91] : Gas pipe Thermistor (Gas) thermistor Room A Room A (Black) Room B (Gray) [S92] : Liquid pipe thermistor Room A (Black) Room B (Gray)

  • Page 186: Removal Of The Compressor

    SiEN12-710A Outdoor Unit Removal of the Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step Remove the terminal " Be careful so as not to burn Terminal cover cover.
  • Page 187 Outdoor Unit SiEN12-710A Step Procedure Points There is a nut fixing the compressor. Warning Remove the nut with an Since it may happen that open-end spanner. refrigeration oil in the compressor will catch fire, prepare wet cloth so as to extinguish fire immediately.

  • Page 188: Removal Of The Four Way Valve • Electronic Expansion Valve

    SiEN12-710A Outdoor Unit Removal of the Four Way Valve • Electronic Expansion Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step " Remove the sound blanket. Warning Be careful about the four way 1.
  • Page 189 Outdoor Unit SiEN12-710A Step Procedure Points " Before working, make Reassembling precautions sure that the refrigerant is 1. Use non-oxidizing brazing empty in the circuit. method. If nitrogen gas is not " Be sure to apply nitrogen available, braze the parts replacement when speedily.

  • Page 190: Part 8 Others

    SiEN12-710A Part 8 Others 1. Others ....................180 1.1 Test Run from the Remote Control ............180 1.2 Jumper Settings ...................181 1.3 Application of Silicon Grease to a Power Transistor and a Diode Bridge..................182 Others...

  • Page 191: Others

    Others SiEN12-710A 1. Others Test Run from the Remote Control For Heat pump In cooling mode, select the lowest programmable temperature; in heating mode, select the highest programmable temperature. " Trial operation may be disabled in either mode depending on the room temperature. "...

  • Page 192: Jumper Settings

    SiEN12-710A Others Jumper Settings 1.2.1 When Two Units are Installed in One Room When two indoor units are installed in one room, the two infrared remote controls can be set for different addresses. How to set the different addresses " Control PCB of the indoor unit (1) Remove the front panel.

  • Page 193: Application Of Silicon Grease To A Power Transistor And A Diode Bridge

    Others SiEN12-710A Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable All outdoor units using inverter type compressor for room air conditioner. Models When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) is certainly applied to the heat radiation part (the contact point to the heat radiation fin) of the power transistor and diode bridge.

  • Page 194: Part 9 Appendix

    SiEN12-710A Part 9 Appendix 1. Piping Diagrams..................184 1.1 Indoor Units ..................184 1.2 Outdoor Units ..................185 2. Wiring Diagrams..................186 2.1 Indoor Units ..................186 2.2 Outdoor Units ..................187 Appendix...

  • Page 195: Piping Diagrams

    Piping Diagrams SiEN12-710A 1. Piping Diagrams Indoor Units 1.1.1 Wall Mounted Type FTKS25/35DVM FTXS25/35EVMA Indoor unit Indoor unit Maffler Assy Heat exchanger Maffler assy Heat exchanger (7.0CuT) 7.0CuT (6.4CuT) 6.4CuT Thermistor (6.4CuT) Thermistor 6.4CuT on heat exch. on heat exch. (6.4CuT) 6.4CuT Cross flow fan...

  • Page 196: Outdoor Units

    SiEN12-710A Piping Diagrams Outdoor Units 2MKS40FV1B OUTDOOR UNIT OUTDOOR TEMPERATURE MUFFLER MOTOR OPERATED VALVE LIQUID PIPE THERMISTOR LIQUID LINE BRANCH WITH HEAT EXCHANGER MUFFLER THERMISTOR PIPE 7.0CuT STOP VALVE FILTER 6.4CuT 6.4CuT 6.4CuT 6.4CuT ROOM A (6.4 CuT) 7.0CuT BRANCH 6.4CuT FIELD PIPE...

  • Page 197: Wiring Diagrams

    Wiring Diagrams SiEN12-710A 2. Wiring Diagrams Indoor Units 2.1.1 Wall Mounted Type FTKS25/35DVM, FTXS25/35EVMA FIELD WIRING. PCB3 PCB1 RECTIFIER 3.15A LED1 OUTDOOR LED2 CAUTION LED3 TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.

  • Page 198: Outdoor Units

    SiEN12-710A Wiring Diagrams Outdoor Units 2MKS40FV1B indoor PCB1 C100 MRM20 IPM1 ROOM A MRM10 ROOM B 3.15A 3.15A 1C11 MRCW S92 RED S91WHT S20 WHT S21 RED POWER SUPPLY 102°C t° t° t° t° t° t° t° RT1 R2T R3T (ROOM-A) (ROOM-A) (OUTDOOR) (DISCHARGE)
  • Page 199 Wiring Diagrams SiEN12-710A Appendix...

  • Page 200: Index

    SiEN12-710A Index Numerics DC voltage / DC current sensor abnormality ..130 defrost control ............51 3-minute standby ............46 diagnosis mode ........... 106 diode bridge ............182 discharge pipe ............55 A1 .................109 discharge pipe temperature ........55 A5 ..............110, 117 discharge pipe temperature control ....
  • Page 201 SiEN12-710A INTELLIGENT EYE sensor PCB ......17 inverter POWERFUL operation ......36 F3 .................124 inverter units refrigerant system check ....152 F6 .................125 fan control ..............50 fan motor connector output check ......146 J3 ..............20, 131 fan motor or related abnormality J4 ..............
  • Page 202 SiEN12-710A position sensor abnormality .........128 S91 ................ 20 power failure recovery function ....16, 18, 181 S92 ................ 20 power supply waveforms check ......151 safety precautions ..........62 power transistor ............182 SC control ............. 54 power transistor check .........153 self-diagnosis digital display ........38 power-airflow dual flaps .........26 sensor malfunction detection ........
  • Page 203 SiEN12-710A Index...

  • Page 204: Drawings & Flow Charts

    SiEN12-710A Drawings & Flow Charts freeze-up protection control or high pressure control ........110 anti-icing function in other rooms / unspecified frequency control ........... 43 voltage (between indoor and outdoor units) ..142 frequency principle ..........24 ARC433 ..............105 front panel open / close fault ....... 116 automatic air flow control ........27 function of thermistor automatic operation ..........29...
  • Page 205 SiEN12-710A phase steps ............27 piping diagrams duct connected type ........184 outdoor units ..........185 wall mounted type ..........184 position sensor abnormality .........128 power supply waveforms check ......151 power transistor ............182 power transistor check .........153 programme dry function .........28 radiation fin temperature rise .......135 signal receiver PCB ..........17 silicon grease ............182 target discharge pipe temperature control .....55...
  • Page 206 Specifications are subject to change without environment. This challenge demands the eco design prior notice. Daikin Europe N.V. explicitly rejects any liability for any direct or and development of a wide range of products and an indirect damage, In the broadest sense, arising from or related to the use energy management system, resulting in energy and/or interpretation of this publication.

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