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CONTENTS

4. CONTROL AND FUNCTIONS

1. Compressor frequency control..................................................................04-1

1-1. Cooling operation ...........................................................................................................04-1

1-2. Heating operation ...........................................................................................................04-3

1-3. Dry operation..................................................................................................................04-4

1-4. Compressor frequency at normal start-up ......................................................................04-5

1-5. Compressor frequency limitation by outdoor temperature ..............................................04-6

2. Auto changeover operation........................................................................04-8

3. Fan control.................................................................................................04-10

3-1. Indoor fan control..........................................................................................................04-10

3-2. Outdoor fan control.......................................................................................................04-13

4. Timer operation control ............................................................................04-16

4-1. →ireless remote control................................................................................................04-16

4-2. →ired remote control ....................................................................................................04-18

5. Defrost operation control .........................................................................04-21

5-1. Defrost operation in heating operation stopped ............................................................04-22

6. Various control..........................................................................................04-23

6-1. Auto restart...................................................................................................................04-23

6-2. MIN. HEAT operation ...................................................................................................04-23

6-3. ECONOMY operation ...................................................................................................04-23

6-4. Fresh air control............................................................................................................04-23

6-5. Compressor preheating ................................................................................................04-24

6-6. External electrical heater control ..................................................................................04-24

6-7. Electronic expansion valve control ...............................................................................04-24

6-8. Drain pump control .......................................................................................................04-25

6-9. Prevention to restart for 3 minutes (3 minutes st) .........................................................04-26

6-10. 4-way valve control.....................................................................................................04-26

6-11. Unit status monitoring and the detected value indication............................................04-27

7. Various protections...................................................................................04-29

7-1. Discharge gas temperature over-rise prevention control ..............................................04-29

7-2. Anti-freezing control (cooling and dry mode) ................................................................04-29

7-3. Current release control .................................................................................................04-30

7-4. Indoor unit fan motor over temperature protection........................................................04-31

7-5. Compressor temperature protection (For 12/18 model)................................................04-31

7-6. Low outdoor temperature protection.............................................................................04-31

7-7. High temperature and high pressure release control....................................................04-32

Fujitsu ADUH18LUAS1 Service Manual

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