Table of contents
Installer reference guide
2
4MWXM-A9
R32 Split series
4P708645-1A – 2022.09
Table of contents
1 About the documentation 4
1.1 About this document ...................................................................................................................................................... 4
1.1.1 Meaning of warnings and symbols ................................................................................................................ 5
2 General safety precautions 7
2.1 For the installer............................................................................................................................................................... 7
2.1.1 General ........................................................................................................................................................... 7
2.1.2 Installation site ............................................................................................................................................... 8
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 11
2.1.4 Electrical ......................................................................................................................................................... 12
3 Specific installer safety instructions 15
4 About the box 20
4.1 Outdoor unit ................................................................................................................................................................... 20
4.1.1 To unpack the outdoor unit ........................................................................................................................... 20
4.1.2 To handle the outdoor unit............................................................................................................................ 20
4.1.3 To remove the accessories from the outdoor unit........................................................................................ 21
5 About the unit 22
5.1 Identification ................................................................................................................................................................... 22
5.1.1 Identification label: Outdoor unit .................................................................................................................. 22
6 Unit installation 23
6.1 Preparing the installation site......................................................................................................................................... 23
6.1.1 Installation site requirements of the outdoor unit........................................................................................ 24
6.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 26
6.2 Opening the unit ............................................................................................................................................................. 27
6.2.1 About opening the unit .................................................................................................................................. 27
6.2.2 To open the outdoor unit............................................................................................................................... 27
6.3 Mounting the outdoor unit............................................................................................................................................. 28
6.3.1 About mounting the outdoor unit ................................................................................................................. 28
6.3.2 Precautions when mounting the outdoor unit.............................................................................................. 28
6.3.3 To provide the installation structure ............................................................................................................. 28
6.3.4 To install the outdoor unit ............................................................................................................................. 29
6.3.5 To provide drainage........................................................................................................................................ 29
6.3.6 To prevent the outdoor unit from falling over .............................................................................................. 30
7 Piping installation 32
7.1 Preparing refrigerant piping ........................................................................................................................................... 32
7.1.1 Refrigerant piping requirements.................................................................................................................... 32
7.1.2 Refrigerant piping insulation.......................................................................................................................... 33
7.1.3 Refrigerant piping length and height difference ........................................................................................... 33
7.2 Connecting the refrigerant piping .................................................................................................................................. 34
7.2.1 About connecting the refrigerant piping ....................................................................................................... 34
7.2.2 Precautions when connecting the refrigerant piping.................................................................................... 34
7.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 36
7.2.4 Pipe bending guidelines ................................................................................................................................. 36
7.2.5 To flare the pipe end ...................................................................................................................................... 36
7.2.6 Connections between outdoor and indoor unit using reducers................................................................... 37
7.2.7 Using the stop valve and service port............................................................................................................ 38
7.2.8 To connect the refrigerant piping to the outdoor unit ................................................................................. 40
7.3 Checking the refrigerant piping...................................................................................................................................... 41
7.3.1 About checking the refrigerant piping........................................................................................................... 41
7.3.2 Precautions when checking the refrigerant piping........................................................................................ 41
7.3.3 To check for leaks ........................................................................................................................................... 41
7.3.4 To perform vacuum drying............................................................................................................................. 42
8 Charging refrigerant 44
8.1 About charging refrigerant ............................................................................................................................................. 44
8.2 About the refrigerant...................................................................................................................................................... 45
8.3 Precautions when charging refrigerant.......................................................................................................................... 46
8.4 To determine the additional refrigerant amount .......................................................................................................... 46
8.5 To determine the complete recharge amount .............................................................................................................. 46
8.6 To charge additional refrigerant..................................................................................................................................... 46
8.7 To fix the fluorinated greenhouse gases label ............................................................................................................... 47
8.8 To check for refrigerant leaks after charging ................................................................................................................. 47
