Daikin Inverter FLKS25BVMB User manual

Inverter Pair
Floor / Ceiling Suspended Dual Type
B-Series
[Applied Models]
zInverter Pair : Cooling Only
zInverter Pair : Heat Pump
SiBE05 - 513A

SiBE05-513A
Table of Contents i
Inverter Pair
B-Series
zCooling Only
Indoor Unit
FLKS25BVMB FLKS25BAVMB
FLKS35BVMB FLKS35BAVMB
Outdoor Unit
RKS25DVMB RKS25D2VMB RKS25D3VMB
RKS35DVMB RKS35D2VMB RKS35D3VMB
zHeat Pump
Indoor Unit
FLXS25BVMB FLXS25BAVMB
FLXS35BVMB FLXS35BAVMB
Outdoor Unit
RXS25DVMB RXS25D2VMB RXS25D3VMB
RXS35DVMB RXS35D2VMB RXS35D3VMB

SiBE05-513A
ii Table of Contents
1. Introduction .............................................................................................v
1.1 Safety Cautions ........................................................................................v
Part 1 List of Functions ................................................................ 1
1. List of Functions ......................................................................................2
Part 2 Specifications .................................................................... 5
1. Specifications ..........................................................................................6
1.1 Cooling Only.............................................................................................6
1.2 Heat Pump ...............................................................................................8
Part 3 Printed Circuit Board Connector Wiring Diagram ...........11
1. Printed Circuit Board Connector Wiring Diagram..................................12
1.1 Indoor Unit..............................................................................................12
1.2 Outdoor Unit ...........................................................................................14
Part 4 Function and Control....................................................... 17
1. Main Functions......................................................................................18
1.1 Frequency Principle................................................................................18
1.2 Auto-Swing .............................................................................................20
1.3 Fan Speed Control for Indoor Units........................................................21
1.4 Programme Dry Function .......................................................................22
1.5 Automatic Operation...............................................................................23
1.6 Thermostat Control.................................................................................24
1.7 NIGHT SET Mode ..................................................................................25
1.8 HOME LEAVE Operation .......................................................................26
1.9 Inverter POWERFUL Operation .............................................................27
1.10 Other Functions......................................................................................28
2. Function of Thermistor ..........................................................................29
2.1 Heat Pump Model...................................................................................29
2.2 Cooling Only Model ................................................................................30
3. Control Specification .............................................................................31
3.1 Mode Hierarchy ......................................................................................31
3.2 Frequency Control..................................................................................32
3.3 Controls at Mode Changing / Start-up....................................................34
3.4 Discharge Pipe Control ..........................................................................35
3.5 Input Current Control..............................................................................36
3.6 Freeze-up Protection Control .................................................................37
3.7 Heating Peak-cut Control .......................................................................37
3.8 Fan Control.............................................................................................38
3.9 Liquid Compression Protection Function 2.............................................38
3.10 Defrost Control .......................................................................................39
3.11 Electronic Expansion Valve Control .......................................................40
3.12 Malfunctions ...........................................................................................43
3.13 Forced Operation Mode .........................................................................44
3.14 Additional Function.................................................................................44
3.15 Facility Setting Jumper (cooling at low outdoor temperature) ................45

SiBE05-513A
Table of Contents iii
Part 5 System Configuration....................................................... 47
1. System Configuration............................................................................48
2. Instruction..............................................................................................49
2.1 Safety precautions..................................................................................49
2.2 Names of parts .......................................................................................51
2.3 Preparation before Operation.................................................................54
2.4 AUTO · DRY · COOL · HEAT · FAN Operation ......................................57
2.5 Adjusting the Air Flow Direction .............................................................59
2.6 POWERFUL Operation ..........................................................................61
2.7 OUTDOOR UNIT SILENT Operation .....................................................62
2.8 HOME LEAVE Operation .......................................................................63
2.9 TIMER Operation ...................................................................................65
2.10 Care and Cleaning .................................................................................67
2.11 Troubleshooting......................................................................................70
Part 6 Service Diagnosis............................................................. 75
1. Caution for Diagnosis............................................................................76
2. Problem Symptoms and Measures .......................................................77
3. Service Check Function ........................................................................78
4. Troubleshooting ....................................................................................81
4.1 Error Codes and Description ..................................................................81
4.2 Indoor Unit PCB Abnormality .................................................................82
4.3 Freeze-up Protection Control or High Pressure Control.........................83
4.4 Fan Motor (AC Motor) or Related Abnormality.......................................85
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................86
4.6 Signal Transmission Error (between Indoor and Outdoor Unit) .............87
4.7 Unspecified Voltage (between Indoor and Outdoor Units) .....................88
4.8 Outdoor Unit PCB Abnormality...............................................................89
4.9 OL Activation (Compressor Overload) ...................................................90
4.10 Compressor Lock ...................................................................................91
4.11 DC Fan Lock ..........................................................................................92
4.12 Input Over Current Detection .................................................................93
4.13 Four Way Valve Abnormality..................................................................94
4.14 Discharge Pipe Temperature Control.....................................................96
4.15 High Pressure Control in Cooling ...........................................................97
4.16 Compressor System Sensor Abnormality ..............................................99
4.17 Position Sensor Abnormality ................................................................100
4.18 DC Voltage / Current Sensor Abnormality............................................101
4.19 Thermistor or Related Abnormality (Outdoor Unit)...............................102
4.20 Electrical Box Temperature Rise..........................................................104
4.21 Radiation Fin Temperature Rise ..........................................................106
4.22 Output Over Current Detection.............................................................108
4.23 Insufficient Gas.....................................................................................110
4.24 Over-voltage Detection.........................................................................112
5. Check ..................................................................................................113
5.1 How to Check .......................................................................................113

SiBE05-513A
iv Table of Contents
Part 7 Removal Procedure ........................................................ 121
1. Indoor Unit...........................................................................................122
1.1 Removal of the Air Filter / Front Grille ..................................................122
1.2 Removal of the Front Panel..................................................................125
1.3 Removal of the Horizontal Blade..........................................................127
1.4 Removal of the Signal Receiver Unit / Swing Motor.............................128
1.5 Removal of the Discharge Grille...........................................................129
1.6 Removal of the Drain Pan ....................................................................130
1.7 Removal of the Electrical Box / PCB ....................................................131
1.8 Removal of the Fan Rotor / Fan Motor.................................................134
1.9 Removal of the Heat Exchanger ..........................................................136
2. Outdoor Unit........................................................................................138
2.1 Removal of Panels and Fan Motor.......................................................138
2.2 Removal of Electrical Box ....................................................................145
2.3 Removal of Reactor and Partition Plate ...............................................147
2.4 Removal of Sound Blanket...................................................................149
2.5 Removal of Four Way Valve.................................................................151
2.6 Removal of Compressor.......................................................................153
2.7 Removal of PCB...................................................................................155
Part 8 Others ............................................................................. 159
1. Others .................................................................................................160
1.1 Test Run from the Remote Controller ..................................................160
1.2 Jumper Settings ...................................................................................161
Part 9 Appendix......................................................................... 163
1. Piping Diagrams..................................................................................164
1.1 Indoor Units ..........................................................................................164
1.2 Outdoor Units .......................................................................................165
2. Wiring Diagrams..................................................................................167
2.1 Indoor Units ..........................................................................................167
2.2 Outdoor Units .......................................................................................167
Index ............................................................................................. i
Drawings & Flow Charts ................................................................ v