Table of contents
Installer and user reference guide
3
FXFQ20~125BVEB
VRV system air conditioner
4P561452-1B – 2021.07
8.3 Checklist before commissioning..................................................................................................................................... 43
8.4 To perform a test run...................................................................................................................................................... 43
8.5 Error codes when performing a test run........................................................................................................................ 45
9 Hand-over to the user 46
10 Disposal 47
11 Technical data 48
11.1 Piping diagram: Indoor unit ............................................................................................................................................ 48
11.2 Wiring diagram................................................................................................................................................................ 48
11.2.1 Unified wiring diagram legend ....................................................................................................................... 48
For the user 52
12 About the system 53
12.1 System layout.................................................................................................................................................................. 53
12.2 Information requirements for fan coil units................................................................................................................... 54
13 User interface 55
14 Before operation 56
15 Operation 57
15.1 Operating the system ..................................................................................................................................................... 57
15.1.1 About operating the system........................................................................................................................... 57
15.1.2 About cooling, heating, fan only, and automatic operation ......................................................................... 57
15.1.3 About the heating operation.......................................................................................................................... 57
15.1.4 To operate the system ................................................................................................................................... 58
15.2 Using the dry program .................................................................................................................................................... 58
15.2.1 About the dry program................................................................................................................................... 58
15.2.2 To use the dry program.................................................................................................................................. 58
15.3 Adjusting the air flow direction ...................................................................................................................................... 58
15.3.1 About the air flow flap.................................................................................................................................... 58
15.4 Active circulation airflow ................................................................................................................................................ 59
15.4.1 To start the active circulation airflow ............................................................................................................ 59
16 Energy saving and optimum operation 61
17 Maintenance and service 62
17.1 Precautions for maintenance and service...................................................................................................................... 62
17.2 Cleaning the air filter, suction grille, air outlet and outside panels............................................................................... 62
17.2.1 To clean the air filter ...................................................................................................................................... 63
17.2.2 To clean the suction grille .............................................................................................................................. 64
17.2.3 To clean the air outlet and outside panels .................................................................................................... 65
17.3 Maintenance after a long stop period............................................................................................................................ 65
17.4 Maintenance before a long stop period......................................................................................................................... 66
17.5 About the refrigerant...................................................................................................................................................... 66
17.6 After-sales service and warranty .................................................................................................................................... 66
17.6.1 Warranty period ............................................................................................................................................. 66
17.6.2 Recommended maintenance and inspection................................................................................................ 66
17.6.3 Recommended maintenance and inspection cycles ..................................................................................... 67
17.6.4 Shortened maintenance and replacement cycles ......................................................................................... 68
18 Troubleshooting 69
18.1 Symptoms that are NOT system malfunctions............................................................................................................... 70
18.1.1 Symptom: The system does not operate....................................................................................................... 70
18.1.2 Symptom: The fan speed does not correspond to the setting...................................................................... 70
18.1.3 Symptom: The fan direction does not correspond to the setting................................................................. 70
18.1.4 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 70
18.1.5 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 70
18.1.6 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 71
18.1.7 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 71
18.1.8 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 71
18.1.9 Symptom: Noise of air conditioners (Outdoor unit)...................................................................................... 71
18.1.10 Symptom: Dust comes out of the unit........................................................................................................... 71
18.1.11 Symptom: The units can give off odours ....................................................................................................... 71
18.1.12 Symptom: The outdoor unit fan does not spin.............................................................................................. 71
18.1.13 Symptom: The display shows "88"................................................................................................................. 71
18.1.14 Symptom: The compressor in the outdoor unit does not stop after a short heating operation ................. 72
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