Daikin FTX20K2V1B, Service Manual

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SiBE041525F
iii Table of Contents
1. Safety Cautions...................................................................................... vi
1.1 Warnings and Cautions Regarding Safety of Workers............................ vi
1.2 Warnings and Cautions Regarding Safety of Users.............................. viii
2. Icons Used ..............................................................................................x
Part 1 - List of Functions................................................................1
1. Functions.................................................................................................2
Part 2 - Specifications.................................................................... 4
1. Specifications ..........................................................................................5
Part 3 - Printed Circuit Board Connector Wiring Diagram.............6
1. Indoor Unit...............................................................................................7
1.1 20/25/35 Class .........................................................................................7
1.2 50/60/71 Class .........................................................................................9
2. Outdoor Unit..........................................................................................12
2.1 20/25/35 Class .......................................................................................12
2.2 50/60/71 class ........................................................................................13
Part 4 - Functions and Control .....................................................14
1. Main Functions......................................................................................15
1.1 Temperature Control ..............................................................................15
1.2 Frequency Principle................................................................................15
1.3 Airflow Direction Control.........................................................................17
1.4 Fan Speed Control for Indoor Unit .........................................................18
1.5 Program Dry Operation ..........................................................................19
1.6 Automatic Operation...............................................................................20
1.7 Thermostat Control.................................................................................21
1.8 NIGHT SET Mode ..................................................................................22
1.9 ECONO Operation .................................................................................22
1.10 Inverter POWERFUL Operation .............................................................23
1.11 Other Functions......................................................................................24
2. Thermistor Functions ............................................................................25
3. Control Specification .............................................................................26
3.1 Mode Hierarchy ......................................................................................26
3.2 Frequency Control..................................................................................27
3.3 Controls at Mode Changing / Start-up....................................................29
3.4 Discharge Pipe Temperature Control.....................................................31
3.5 Input Current Control..............................................................................32
3.6 Freeze-up Protection Control .................................................................33
3.7 Heating Peak-cut Control .......................................................................33
3.8 Outdoor Fan Control...............................................................................34
3.9 Liquid Compression Protection Function................................................34
3.10 Defrost Control .......................................................................................35
3.11 Electronic Expansion Valve Control .......................................................36
3.12 Malfunctions ...........................................................................................39