Table Of Contents - Daikin FTX20K(2)V1B Service Manual

1. Safety Cautions...................................................................................... vi
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
2. Outdoor Unit..........................................................................................12
Part 4 - Functions and Control ..................................................... 14
1. Main Functions......................................................................................15
2. Thermistor Functions ............................................................................25
3. Control Specification .............................................................................26
iii
1.1 Warnings and Cautions Regarding Safety of Workers............................ vi
1.2 Warnings and Cautions Regarding Safety of Users.............................. viii
1.1 20/25/35 Class .........................................................................................7
1.2 50/60/71 Class .........................................................................................9
2.1 20/25/35 Class .......................................................................................12
2.2 50/60/71 class ........................................................................................13
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
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
SiBE041525F

Table of Contents