Service Manual

SiUS041638E

Table of Contents ii

1. Safety Cautions........................................................................................... v

1.1 Warnings and Cautions Regarding Safety of Workers................................. v

1.2 Warnings and Cautions Regarding Safety of Users....................................vii

2. Icons Used .................................................................................................. x

Part 1 List of Functions ................................................................... 1

1. Functions.....................................................................................................2

Part 2 Specifications ....................................................................... 3

1. Specifications ..............................................................................................4

1.1 Cooling Only................................................................................................. 4

1.2 Heat Pump ................................................................................................... 5

Part 3 Printed Circuit Board Connector Wiring Diagram ................ 6

1. Indoor Unit...................................................................................................7

1.1 FTX30/36NVJU ............................................................................................ 7

2. Outdoor Unit................................................................................................9

2.1 RK(X)30/36NMVJU ...................................................................................... 9

Part 4 Functions and Control......................................................... 12

1. Main Functions..........................................................................................13

1.1 Temperature Control .................................................................................. 13

1.2 Frequency Principle.................................................................................... 13

1.3 Airflow Direction Control............................................................................. 15

1.4 Fan Speed Control for Indoor Unit ............................................................. 16

1.5 Program Dry Operation .............................................................................. 17

1.6 Automatic Operation................................................................................... 18

1.7 Thermostat Control..................................................................................... 19

1.8 NIGHT SET Mode ...................................................................................... 20

1.9 ECONO Operation ..................................................................................... 20

1.10 INTELLIGENT EYE Operation ................................................................... 21

1.11 POWERFUL Operation .............................................................................. 22

1.12 Clock Setting .............................................................................................. 23

1.13 WEEKLY TIMER Operation ....................................................................... 24

1.14 Other Functions.......................................................................................... 30

2. Thermistor Functions ................................................................................31

3. Control Specification .................................................................................33

3.1 Mode Hierarchy .......................................................................................... 33

3.2 Frequency Control...................................................................................... 34

3.3 Controls at Mode Changing/Start-up.......................................................... 36

3.4 Discharge Pipe Temperature Control......................................................... 38

3.5 Input Current Control.................................................................................. 39

3.6 Freeze-up Protection Control ..................................................................... 40

3.7 Heating Peak-cut Control ........................................................................... 40

3.8 Outdoor Fan Control................................................................................... 41