Table of contents
Installer reference guide
2
CVXM20A + FVXM25~50A
Split system air conditioners
4P625991-1C – 2021.09
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.......................................................................................................... 10
2.2.4 Electrical ......................................................................................................................................................... 12
3 Specific installer safety instructions 15
4 About the box 17
4.1 Indoor unit ...................................................................................................................................................................... 17
4.1.1 To unpack the indoor unit.............................................................................................................................. 17
4.1.2 To remove the accessories from the indoor unit .......................................................................................... 17
5 About the unit 19
5.1 System layout.................................................................................................................................................................. 19
5.2 Operation range.............................................................................................................................................................. 19
5.3 About the wireless LAN................................................................................................................................................... 20
5.3.1 Precautions when using the wireless LAN ..................................................................................................... 20
5.3.2 Basic parameters ............................................................................................................................................ 20
5.3.3 Setting the wireless LAN................................................................................................................................. 21
6 Unit installation 22
6.1 Preparing the installation site......................................................................................................................................... 22
6.1.1 Installation site requirements of the indoor unit .......................................................................................... 22
6.2 Opening the indoor unit ................................................................................................................................................. 24
6.2.1 To remove the front panel ............................................................................................................................. 24
6.2.2 To remove the front grille .............................................................................................................................. 24
6.2.3 To open the terminal block and remove the electrical wiring box cover ..................................................... 25
6.3 Mounting the indoor unit ............................................................................................................................................... 26
6.3.1 To install the indoor unit ................................................................................................................................ 26
6.3.2 To drill a wall hole........................................................................................................................................... 30
6.3.3 To remove the slit portions............................................................................................................................ 30
6.3.4 To provide drainage........................................................................................................................................ 31
6.4 Mounting the user interface........................................................................................................................................... 33
6.4.1 To mount the user interface holder............................................................................................................... 33
7 Piping installation 35
7.1 Preparing refrigerant piping ........................................................................................................................................... 35
7.1.1 Refrigerant piping requirements.................................................................................................................... 35
7.1.2 Refrigerant piping insulation.......................................................................................................................... 36
7.2 Connecting the refrigerant piping .................................................................................................................................. 36
7.2.1 About connecting the refrigerant piping ....................................................................................................... 36
7.2.2 Precautions when connecting the refrigerant piping.................................................................................... 36
7.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 37
7.2.4 Pipe bending guidelines ................................................................................................................................. 38
7.2.5 To flare the pipe end ...................................................................................................................................... 38
7.2.6 To connect the refrigerant piping to the indoor unit .................................................................................... 39
8 Electrical installation 40
8.1 About connecting the electrical wiring .......................................................................................................................... 40
8.1.1 Precautions when connecting the electrical wiring....................................................................................... 40
8.1.2 Guidelines when connecting the electrical wiring......................................................................................... 41
8.1.3 Specifications of standard wiring components.............................................................................................. 42
8.2 To connect the electrical wiring to the indoor unit ....................................................................................................... 42
8.3 To connect optional accessories (wired user interface, central user interface, wireless adapter, etc.) ...................... 43
9 Finishing the indoor unit installation 45
9.1 To finish the indoor unit installation .............................................................................................................................. 45
9.2 To close the indoor unit.................................................................................................................................................. 45
9.2.1 To close the electrical wiring box and close the terminal block.................................................................... 45
9.2.2 To re-install the front grille ............................................................................................................................ 45
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