Vertiv Liebert PEX+ Series - 7.2. Routine Maintenance Inspection Items (Semi-Annual)

Vertiv | Liebert PEX+ Chilled Water | User Manual 90
System Operation and Maintenance
• Before fastening the connection of any mechanical parts or cables, ensure that the power supply of the
control unit has been disconnected.
• Do not use the water detection sensor adjacent to flammable liquid or use it to detect flammable liquid.
7.6. Filter Maintenance Guide
The eiciency of the filter in the unit is 30%, which complies with US ASHRAE52-76 and Eurovent 4/5 standards,
and the dust resistance value is 90% (EU4 standards). To ensure eicient operation, the dust filter must be
checked once a month, and replaced as required. The filter clogging switch and pressure dierence switch are
located as shown in Figure 7-1 and Figure 7-2.
No. Description No. Description
1 Airflow loss switch 2 Filter clogging switch
Figure 7-1 Filter Clogging Switch and Alrflow Loss Switch (Upflow Unit)