Vertiv | Liebert AHU | User Manual
4
Safety Precautions and Measures
The important safety precautions and measures that should be followed during the installation and maintenance are
described in the following sections.
Read the manual prior to installation and operation of the unit. Only qualified personnel should move, install, or service
this equipment.
Before working on the equipment, the user reads and considers all precautions, compliance and safety measures. The
unit control must be used exclusively for the purpose which it is intended for; the manufacturer takes no liability for
incorrect use or a modification to the unit control.
Adhere to all the Warnings and Cautionary measures included in the manual.
Please read this manual carefully before installing, maintaining and troubleshooting; especially the
Warning/Danger/Caution information in the User Guide. Apart from the User Guide, also pay attention to
the warning labels on the unit and its components.
This manual is retained for the entire service life of the unit. The user must read all the precautions, dangers, warnings,
and cautionary measures mentioned in the manual prior to carrying out any operations on the unit. Each unit is equipped
with electric insulation which allows the users to work in safe conditions. The main switch is positioned on the electrical
panel cover; to access it, open the right door. Before any maintenance operation, switch off the unit with this electrical
insulation device to eliminate risks such as electrical shocks, burns, automatic restarting, moving parts, and remote
control. The panel key, supplied along with the unit, must be kept by the personnel responsible for the maintenance. The
protective covers can be removed after the electric power has been cut off by opening the main switch.
In the following sections, notice the various cautionary measures and warnings that need to be read carefully prior to
installing or operating the system.
Disconnect the local and remote power supplies prior to working with the unit.
Prior to the installation process, read all the instructions, verify if all the parts are in place, and check the nameplate to
ensure the voltage matches the available utility power for the unit.
The controller doesn’t isolate power from the unit even in the Off mode, and some internal components still require and
receive power during the Off mode.
If the unit door is open while the fans are operating, the airflow may result in abrupt slamming of the door resulting in
injury. Another aspect is the presence of small objects in the fan’s bay that can result in object ejection during the fan
start-up and there is a probable risk of being hit by these objects resulting in grievous injury and causing equipment
damage.
The unit contains fluids and gases under high pressure. Therefore, the pressure should be relieved before working with
the piping.
Various components such as compressors, refrigerant discharge lines, and humidifiers are extremely hot during the unit
operation (if applicable). Therefore, allow sufficient time for the unit to cool down before working with the unit cabinet.
Handle the unit with extreme caution and wear safety equipment such as protective gloves, safety shoes, and arm
protection while working with the hot compressors, discharge lines, and reheats.
There is a risk of water leaking that can damage both the equipment and the building. Effective water drain connections
and facilities should be available. Installation should be precise. Implementation of the application and service practices
should be appropriate and fault-free. Failure to comply with these norms will result in water leakage from the unit. Water
leakage can lead to massive damage and loss of critical equipment in the hosting ecosystem. Therefore, care should be
taken to ensure that the unit is not located directly above any equipment that could sustain damage due to water and
excessive moisture. Use of a leak detection system for the unit and system supply lines are recommended by Vertiv.
