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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

Table of contents

Installer reference guide

5MWXM-A9

R32 Split series

4P766272-3A – 2024.10

8.8 To check refrigerant piping joints for leaks after charging refrigerant......................................................................... 49

9 Electrical installation 50

9.1 About connecting the electrical wiring.......................................................................................................................... 50

9.1.1 Precautions when connecting the electrical wiring...................................................................................... 50

9.1.2 Guidelines when connecting the electrical wiring........................................................................................ 52

9.1.3 Specifications of standard wiring components............................................................................................. 53

9.2 To connect the electrical wiring to the outdoor unit .................................................................................................... 54

10 Finishing the outdoor unit installation 56

10.1 To finish the outdoor unit installation ........................................................................................................................... 56

10.2 To close the outdoor unit............................................................................................................................................... 56

11 Configuration 57

11.1 About standby electricity saving function ..................................................................................................................... 57

11.1.1 To turn ON standby electricity saving function............................................................................................. 57

11.2 About priority room function......................................................................................................................................... 58

11.2.1 To set the priority room function.................................................................................................................. 58

11.3 About night quiet mode................................................................................................................................................. 58

11.3.1 To turn ON the night quiet mode.................................................................................................................. 58

11.4 About heat mode lock.................................................................................................................................................... 59

11.4.1 To turn ON heat mode lock ........................................................................................................................... 59

12 Commissioning 60

12.1 Overview: Commissioning.............................................................................................................................................. 60

12.2 Precautions when commissioning ................................................................................................................................. 60

12.3 Checklist before commissioning .................................................................................................................................... 61

12.4 Checklist during commissioning..................................................................................................................................... 62

12.5 Trial operation and testing............................................................................................................................................. 62

12.5.1 About wiring error check............................................................................................................................... 62

12.5.2 To perform a test run .................................................................................................................................... 63

12.6 Starting up the outdoor unit .......................................................................................................................................... 64

13 Hand-over to the user 65

14 Maintenance and service 66

14.1 Overview: Maintenance and service.............................................................................................................................. 66

14.2 Maintenance safety precautions ................................................................................................................................... 66

14.3 Checklist for yearly maintenance of the outdoor unit .................................................................................................. 67

14.4 About the compressor ................................................................................................................................................... 67

15 Troubleshooting 68

15.1 Overview: Troubleshooting............................................................................................................................................ 68

15.2 Precautions when troubleshooting................................................................................................................................ 68

15.3 Solving problems based on symptoms .......................................................................................................................... 68

15.3.1 Symptom: Indoor units fall, vibrate or make noise....................................................................................... 68

15.3.2 Symptom: The unit is NOT heating or cooling as expected.......................................................................... 69

15.3.3 Symptom: Water leakage .............................................................................................................................. 69

15.3.4 Symptom: Electrical leakage.......................................................................................................................... 69

15.3.5 Symptom: Priority room setting does NOT function .................................................................................... 69

15.3.6 Symptom: Unit does NOT function or burn damage .................................................................................... 69

15.4 Solving problems based on LED behaviour.................................................................................................................... 69

15.4.1 Fault diagnosis using LED on outdoor unit PCB ............................................................................................ 69

16 Disposal 71

16.1 Overview: Disposal ......................................................................................................................................................... 71

16.2 To pump down ............................................................................................................................................................... 71

16.3 To start and stop forced cooling .................................................................................................................................... 72

17 Technical data 73

17.1 Wiring diagram ............................................................................................................................................................... 73

17.1.1 Unified wiring diagram legend ...................................................................................................................... 73

17.2 Piping diagram: Outdoor unit ........................................................................................................................................ 75

18 Glossary 78