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Installer and user reference guide

VRV IV system air conditioner

RXMLQ8T7Y1B*

RXYLQ10T7Y1B*

RXYLQ12T7Y1B*

RXYLQ14T7Y1B*

Table of contents

Installer and user reference guide

RXMLQ8 + RXYLQ10~14T7Y1B*

VRV IV system air conditioner

4P543427-1C – 2025.01

Table of contents

1 About the documentation 6

1.1 About this document...................................................................................................................................................... 6

1.2 Meaning of warnings and symbols ................................................................................................................................ 6

2 General safety precautions 8

2.1 For the installer .............................................................................................................................................................. 8

2.1.1 General........................................................................................................................................................... 8

2.1.2 Installation site............................................................................................................................................... 9

2.1.3 Refrigerant — in case of R410A or R32......................................................................................................... 9

2.1.4 Electrical......................................................................................................................................................... 11

3 Specific installer safety instructions 13

For the user 16

4 User safety instructions 17

4.1 General ........................................................................................................................................................................... 17

4.2 Instructions for safe operation ...................................................................................................................................... 18

5 About the system 21

5.1 System layout ................................................................................................................................................................. 22

6 User interface 23

7 Operation 24

7.1 Before operation ............................................................................................................................................................ 24

7.2 Operation range ............................................................................................................................................................. 24

7.3 Operating the system..................................................................................................................................................... 25

7.3.1 About operating the system.......................................................................................................................... 25

7.3.2 About cooling, heating, fan only, and automatic operation......................................................................... 25

7.3.3 About the heating operation......................................................................................................................... 25

7.3.4 To operate the system (WITHOUT cool/heat changeover remote control switch)..................................... 26

7.3.5 To operate the system (WITH cool/heat changeover remote control switch) ............................................ 26

7.4 Using the dry program ................................................................................................................................................... 27

7.4.1 About the dry program.................................................................................................................................. 27

7.4.2 To use the dry program (WITHOUT cool/heat changeover remote control switch) ................................... 27

7.4.3 To use the dry program (WITH cool/heat changeover remote control switch)........................................... 28

7.5 Adjusting the air flow direction...................................................................................................................................... 28

7.5.1 About the air flow flap................................................................................................................................... 28

7.6 Setting the master user interface .................................................................................................................................. 29

7.6.1 About setting the master user interface....................................................................................................... 29

7.6.2 To designate the master user interface (VRV DX and Hydrobox)................................................................. 30

7.7 About control systems ................................................................................................................................................... 30

8 Energy saving and optimum operation 31

8.1 Available main operation methods................................................................................................................................ 31

8.2 Available comfort settings.............................................................................................................................................. 32

9 Maintenance and service 33

9.1 Maintenance after a long stop period ........................................................................................................................... 33

9.2 Maintenance before a long stop period ........................................................................................................................ 34

9.3 About the refrigerant ..................................................................................................................................................... 34

9.4 After-sales service and warranty ................................................................................................................................... 34

9.4.1 Warranty period ............................................................................................................................................ 34

9.4.2 Recommended maintenance and inspection ............................................................................................... 34

9.4.3 Recommended maintenance and inspection cycles..................................................................................... 35

9.4.4 Shortened maintenance and replacement cycles......................................................................................... 36

10 Troubleshooting 37

10.1 Error codes: Overview.................................................................................................................................................... 38

10.2 Symptoms that are NOT system malfunctions .............................................................................................................. 40

10.2.1 Symptom: The system does not operate ...................................................................................................... 41

10.2.2 Symptom: Cool/Heat cannot be changed over............................................................................................. 41

10.2.3 Symptom: Fan operation is possible, but cooling and heating do not work................................................ 41

10.2.4 Symptom: The fan speed does not correspond to the setting..................................................................... 41

10.2.5 Symptom: The fan direction does not correspond to the setting ................................................................ 41