Table of contents
Installer and user reference guide
2
LREN8~12A + LRNUN5A
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1C – 2024.12
Table of contents
1 About the documentation 5
1.1 About this document...................................................................................................................................................... 5
2 General safety precautions 6
2.1 About the documentation.............................................................................................................................................. 6
2.1.1 Meaning of warnings and symbols................................................................................................................ 6
2.2 For the installer .............................................................................................................................................................. 7
2.2.1 General........................................................................................................................................................... 7
2.2.2 Installation site............................................................................................................................................... 8
2.2.3 Refrigerant — in case of R744....................................................................................................................... 9
2.2.4 Electrical......................................................................................................................................................... 11
3 Specific installer safety instructions 13
For the user 22
4 User safety instructions 23
4.1 General ........................................................................................................................................................................... 23
4.2 Instructions for safe operation ...................................................................................................................................... 24
5 About the system 29
5.1 System layout ................................................................................................................................................................. 30
6 Operation 31
6.1 Operation modes............................................................................................................................................................ 31
6.2 Operation range ............................................................................................................................................................. 31
6.3 Field piping pressure ...................................................................................................................................................... 31
7 Energy saving and optimum operation 32
8 Maintenance and service 33
8.1 Maintenance before a long stop period ........................................................................................................................ 33
8.2 Maintenance after a long stop period ........................................................................................................................... 33
8.3 About the refrigerant ..................................................................................................................................................... 34
8.4 Recommended maintenance and inspection................................................................................................................ 34
9 Troubleshooting 35
9.1 Error codes: Overview.................................................................................................................................................... 36
10 Relocation 38
11 Disposal 39
For the installer 40
12 About the box 41
12.1 Outdoor unit................................................................................................................................................................... 41
12.1.1 To transport the pallet................................................................................................................................... 41
12.1.2 To unpack the outdoor unit........................................................................................................................... 42
12.1.3 To handle the outdoor unit ........................................................................................................................... 43
12.1.4 To remove the accessories from the outdoor unit ....................................................................................... 44
13 About the units and options 46
13.1 Identification .................................................................................................................................................................. 46
13.1.1 Identification label: Outdoor unit.................................................................................................................. 46
13.2 About the outdoor unit .................................................................................................................................................. 47
13.2.1 Labels on outdoor unit .................................................................................................................................. 48
13.3 System layout ................................................................................................................................................................. 54
13.4 Combining units and options ......................................................................................................................................... 54
13.4.1 Possible options for the outdoor unit ........................................................................................................... 54
13.5 Indoor unit constraints................................................................................................................................................... 55
13.5.1 Constraints for refrigeration.......................................................................................................................... 55
14 Unit installation 57
14.1 Preparing the installation site ........................................................................................................................................ 58
14.1.1 Installation site requirements of the outdoor unit ....................................................................................... 58
