Table of Contents
Installer and user reference guide
3
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
10.2.7 Symptom: White mist comes out of a unit (Indoor unit, heat exchanger unit)............................................ 43
10.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 43
10.2.9 Symptom: Noise of air conditioners (Indoor unit, heat exchanger unit) ...................................................... 43
10.2.10 Symptom: Noise of air conditioners (Indoor unit, compressor unit, heat exchanger unit) ......................... 43
10.2.11 Symptom: Noise of air conditioners (compressor unit, heat exchanger unit).............................................. 43
10.2.12 Symptom: Dust comes out of the heat exchanger unit................................................................................. 43
10.2.13 Symptom: The units can give off odours ....................................................................................................... 43
10.2.14 Symptom: The heat exchanger unit fan does not spin.................................................................................. 44
10.2.15 Symptom: The display shows "88"................................................................................................................. 44
10.2.16 Symptom: The compressor in the compressor unit does not stop after a short heating operation ........... 44
10.2.17 Symptom: The inside of an compressor unit is warm even when the unit has stopped.............................. 44
10.2.18 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 44
11 Relocation 45
12 Disposal 46
For the installer 47
13 About the box 48
13.1 Overview: About the box ................................................................................................................................................ 48
13.2 Compressor unit.............................................................................................................................................................. 48
13.2.1 To unpack the compressor unit ..................................................................................................................... 48
13.2.2 To handle the compressor unit...................................................................................................................... 49
13.2.3 To remove the accessories from the compressor unit.................................................................................. 49
13.2.4 To remove the transportation stay................................................................................................................ 50
13.2.5 To remove the transportation EPS................................................................................................................. 50
13.3 Heat exchanger unit........................................................................................................................................................ 51
13.3.1 To unpack the heat exchanger unit ............................................................................................................... 51
13.3.2 To handle the heat exchanger unit ................................................................................................................ 51
13.3.3 To remove the accessories from the heat exchanger unit............................................................................ 52
13.3.4 To remove the transportation sheet.............................................................................................................. 52
14 About the units and options 53
14.1 Overview: About the units and options.......................................................................................................................... 53
14.2 Identification ................................................................................................................................................................... 53
14.2.1 Identification label: Compressor unit............................................................................................................. 53
14.2.2 Identification label: Heat exchanger unit....................................................................................................... 54
14.3 About the compressor unit and heat exchanger unit.................................................................................................... 54
14.4 System layout.................................................................................................................................................................. 55
14.5 Combining units and options.......................................................................................................................................... 55
14.5.1 About combining units and options............................................................................................................... 56
14.5.2 Possible combinations of indoor units........................................................................................................... 56
14.5.3 Possible options for the compressor unit and heat exchanger unit ............................................................. 56
15 Unit installation 60
15.1 Preparing the installation site......................................................................................................................................... 60
15.1.1 Installation site requirements of the compressor unit.................................................................................. 60
15.1.2 Installation site requirements of the heat exchanger unit............................................................................ 62
15.2 Opening the unit ............................................................................................................................................................. 63
15.2.1 About opening the units................................................................................................................................. 63
15.2.2 To open the compressor unit......................................................................................................................... 63
15.2.3 To open the switch box cover of the heat exchanger unit............................................................................ 64
15.3 Mounting the compressor unit....................................................................................................................................... 64
15.3.1 Precautions when mounting the compressor unit........................................................................................ 64
15.3.2 Guidelines when installing the compressor unit ........................................................................................... 64
15.4 Mounting the heat exchanger unit................................................................................................................................. 65
15.4.1 Precautions when mounting the heat exchanger unit .................................................................................. 65
15.4.2 Guidelines when installing the heat exchanger unit ..................................................................................... 65
16 Piping installation 66
16.1 Preparing refrigerant piping ........................................................................................................................................... 66
16.1.1 Refrigerant piping requirements.................................................................................................................... 66
16.1.2 Refrigerant piping material ............................................................................................................................ 67
16.1.3 To select the piping size ................................................................................................................................. 67
16.1.4 To select refrigerant branch kits .................................................................................................................... 69
16.1.5 Refrigerant piping length and height difference ........................................................................................... 69
16.2 Connecting the refrigerant piping .................................................................................................................................. 71
16.2.1 About connecting the refrigerant piping ....................................................................................................... 71
16.2.2 Precautions when connecting the refrigerant piping.................................................................................... 71
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