Vertiv | Liebert® DM | User Manual 94
System Operation and Maintenance
7.2.2. Fan
The monthly inspection particulars of the fan kit include: motor operation status, impeller status, fan kit fixation and
clearance between fan and impeller. Inspect the motor bearings and impeller monthly; and replace it if any damaged found in
impeller. Check that the impeller is tightly mounted on the rotor of the motor and does not obstruct against its neighboring
metal components during rotation. Since the fan kit operates 24 hours every day continuously, any unusual airflow
obstruction must be cleared in time to avoid damage to the cooling system. This unusual airflow obstruction can also aect
other system components due to reduction in air volume.
7.2.3. Drain Pipe
Inspect water pan periodically for normal operation of the drain pipe. Ensure that no foreign matter or leakage exists in the
drain pipe.
7.2.4. Electrical Heater
If the optional electrical heater is used, it should be maintained periodically. Ensure that no dust or foreign matter deposits
on its surface; the heater is fixed reliably and the cable connection is firm. The heating elements will heat continuously in
normal operation conditions, hence inspect the heater in every six months for its normal operation. Figure 7-4 and Figure
7-5 show the location of the electrical heater; if the heater needs to be replaced, please contact the Vertiv representative for
maintenance support.
The electrical heater cable must be routed through the thimble socket, then connected to the heater.
DM 07 kW/12 kW Upflow Unit DM 17 kW Upflow Unit
No. Description
1 Location of Electrical Heater
Figure 7-4 Location of Electrical Heater (07 kW, 12 kW, and 17 kW)
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