Daikin VRV 5 REYA8A7Y1B, Installer And User Manual, Page: 3 / 180

Table of contents
Installer and user reference guide
3
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
10.2.7 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 45
10.2.8 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 45
10.2.9 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 45
10.2.10 Symptom: Noise of air conditioners (Outdoor unit)...................................................................................... 45
10.2.11 Symptom: Dust comes out of the unit........................................................................................................... 45
10.2.12 Symptom: The units can give off odours ....................................................................................................... 45
10.2.13 Symptom: The outdoor unit fan does not spin.............................................................................................. 46
10.2.14 Symptom: The display shows "88"................................................................................................................. 46
10.2.15 Symptom: The compressor in the outdoor unit does not stop after a short heating operation ................. 46
10.2.16 Symptom: The inside of an outdoor unit is warm even when the unit has stopped.................................... 46
10.2.17 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 46
11 Relocation 47
12 Disposal 48
13 Technical data 49
13.1 Eco Design requirements................................................................................................................................................ 49
For the installer 50
14 About the box 51
14.1 To unpack the outdoor unit............................................................................................................................................ 52
14.2 To remove the accessories from the outdoor unit ........................................................................................................ 52
14.3 Accessory pipes: Diameters............................................................................................................................................ 53
14.4 To remove the transportation stay (only for 5~12 HP).................................................................................................. 53
15 About the units and options 55
15.1 Identification label: Outdoor unit................................................................................................................................... 55
15.2 About the outdoor unit................................................................................................................................................... 55
15.3 System layout.................................................................................................................................................................. 56
15.4 Combining units and options.......................................................................................................................................... 57
15.4.1
About combining units and options............................................................................................................... 57
15.4.2 Possible combinations of indoor units........................................................................................................... 57
15.4.3 Possible combinations of outdoor units ........................................................................................................ 57
15.4.4 Possible options for the outdoor unit ............................................................................................................ 58
16 Special requirements for R32 units 60
16.1 Installation space requirements ..................................................................................................................................... 60
16.2 System layout requirements........................................................................................................................................... 60
16.3 About the charge limit .................................................................................................................................................... 64
16.4 To determine the charge limit........................................................................................................................................ 64
17 Unit installation 72
17.1 Preparing the installation site......................................................................................................................................... 72
17.1.1
Installation site requirements of the outdoor unit........................................................................................ 72
17.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 75
17.2 Opening the unit ............................................................................................................................................................. 76
17.2.1
About opening the units................................................................................................................................. 76
17.2.2 To open the outdoor unit............................................................................................................................... 77
17.2.3 To open the electrical component box of the outdoor unit ......................................................................... 77
17.3 Mounting the outdoor unit............................................................................................................................................. 78
17.3.1
To provide the installation structure ............................................................................................................. 78
17.3.2 To install the outdoor unit ............................................................................................................................. 79
18 Piping installation 80
18.1 Preparing refrigerant piping ........................................................................................................................................... 80
18.1.1
Refrigerant piping requirements.................................................................................................................... 80
18.1.2 Refrigerant piping material ............................................................................................................................ 80
18.1.3 Refrigerant piping insulation.......................................................................................................................... 81
18.1.4 To select the piping size ................................................................................................................................. 81
18.1.5 To select refrigerant branch kits .................................................................................................................... 83
18.1.6 Installation limitations.................................................................................................................................... 84
18.1.7 About the piping length.................................................................................................................................. 85
18.1.8 Single outdoor units and standard multi-outdoor-unit combinations >20 HP ............................................. 87
18.1.9 Standard multi-outdoor-unit combinations ≤20 HP and free multi-outdoor-unit combinations ................ 88
18.1.10 Multiple outdoor units: Possible layouts ....................................................................................................... 89
18.2 Connecting the refrigerant piping .................................................................................................................................. 91
18.2.1
About connecting the refrigerant piping ....................................................................................................... 91
18.2.2 Precautions when connecting the refrigerant piping.................................................................................... 91