Table of contents
Installer and user reference guide
2
FXFA20~125A2VEB
VRV system air conditioner
4P599624-1C – 2020.12
Table of contents
1 About the documentation 4
1.1 About this document ...................................................................................................................................................... 4
2 General safety precautions 5
2.1 About the documentation .............................................................................................................................................. 5
2.1.1 Meaning of warnings and symbols ................................................................................................................ 5
2.2 For the installer............................................................................................................................................................... 6
2.2.1 General ........................................................................................................................................................... 6
2.2.2 Installation site ............................................................................................................................................... 7
2.2.3 Refrigerant — in case of R410A or R32.......................................................................................................... 7
2.2.4 Electrical ......................................................................................................................................................... 9
3 Specific installer safety instructions 12
3.1 Instructions for equipment using R32 refrigerant ......................................................................................................... 14
3.1.1 Installation space requirements..................................................................................................................... 15
For the user 16
4 User safety instructions 17
4.1 General............................................................................................................................................................................ 17
4.2 Instructions for safe operation ....................................................................................................................................... 18
5 About the system 23
5.1 System layout.................................................................................................................................................................. 23
5.2 Information requirements for fan coil units................................................................................................................... 24
6 User interface 25
7 Before operation 26
8 Operation 27
8.1 Operation range.............................................................................................................................................................. 27
8.2 About operation modes.................................................................................................................................................. 27
8.2.1 Basic operation modes................................................................................................................................... 27
8.2.2 Special heating operation modes................................................................................................................... 28
8.2.3 Adjusting the airflow direction....................................................................................................................... 28
8.2.4 Active circulation airflow................................................................................................................................ 29
8.3 To operate the system.................................................................................................................................................... 29
9 Energy saving and optimum operation 30
10 Maintenance and service 31
10.1 Precautions for maintenance and service...................................................................................................................... 31
10.2 Cleaning the air filter, suction grille, air outlet and outside panels............................................................................... 32
10.2.1 To clean the air filter ...................................................................................................................................... 32
10.2.2 To clean the suction grille .............................................................................................................................. 33
10.2.3 To clean the air outlet and outside panels .................................................................................................... 34
10.3 Maintenance before a long stop period......................................................................................................................... 35
10.4 Maintenance after a long stop period............................................................................................................................ 35
10.5 About the refrigerant...................................................................................................................................................... 35
10.5.1 About the refrigerant leakage sensor ............................................................................................................ 36
11 Troubleshooting 38
11.1 Symptoms that are NOT system malfunctions............................................................................................................... 39
11.1.1 Symptom: The system does not operate....................................................................................................... 39
11.1.2 Symptom: The fan speed does not correspond to the setting...................................................................... 39
11.1.3 Symptom: The fan direction does not correspond to the setting................................................................. 39
11.1.4 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 40
11.1.5 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 40
11.1.6 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 40
11.1.7 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 40
11.1.8 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 40
11.1.9 Symptom: Dust comes out of the unit........................................................................................................... 40
11.1.10 Symptom: The units can give off odours ....................................................................................................... 40
12 Relocation 41
