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Installer reference guide

R32 Split series

5MWXM68A2V1B9

5MWXM90A2V1B9

Table of contents

Installer reference guide

5MWXM-A9

R32 Split series

4P766272-3A – 2024.10

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 31

7.1 Preparing refrigerant piping........................................................................................................................................... 31

7.1.1 Refrigerant piping requirements ................................................................................................................... 31

7.1.2 Refrigerant piping insulation ......................................................................................................................... 32

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 ................................................................................... 35

7.2.3 Guidelines when connecting the refrigerant piping ..................................................................................... 36

7.2.4 Pipe bending guidelines................................................................................................................................. 37

7.2.5 To flare the pipe end ..................................................................................................................................... 37

7.2.6 Connections between outdoor and indoor unit using reducers .................................................................. 37

7.2.7 Using the stop valve and service port ........................................................................................................... 40

7.2.8 To connect the refrigerant piping to the outdoor unit................................................................................. 41

7.2.9 To install sound insulation ............................................................................................................................. 42

7.3 Checking the refrigerant piping ..................................................................................................................................... 42

7.3.1 About checking the refrigerant piping .......................................................................................................... 42

7.3.2 Precautions when checking the refrigerant piping....................................................................................... 42

7.3.3 To check for leaks .......................................................................................................................................... 43

7.3.4 To perform vacuum drying ............................................................................................................................ 43

8 Charging refrigerant 45

8.1 About charging refrigerant............................................................................................................................................. 45

8.2 About the refrigerant ..................................................................................................................................................... 46

8.3 Precautions when charging refrigerant ......................................................................................................................... 47

8.4 To determine the additional refrigerant amount.......................................................................................................... 47

8.5 To determine the complete recharge amount.............................................................................................................. 48

8.6 To charge additional refrigerant.................................................................................................................................... 48

8.7 To fix the fluorinated greenhouse gases label............................................................................................................... 48