34 VERTIV™ - Liebert
®
EFC - UM - 10040805MAN_ENG - 30.03.2023
or installation and that are free from dirt or other foreign matters.
For evaporative systems spraying nozzles, check that water jet of
each nozzle is regular and clean those ones that appear to be clogged.
For conductivimeter, they are calibrated in factory; double check
the calibration with portable calibrated instrument and, in case of
needs, re-calibrate using the solution provided within the unit.
Calibration check should be done at least quarterly (see Chapter 3.2).
Set water feeding valve speed to limit water hammering (only in
case of solenoid valve mounted) (see Chapter 3.2).
Chapter 3.2,
tables 3.1 and 3.2
For manually operated dampers, check that operation is smooth
and it is possible to block damper in the desired position easily and
For motorized dampers ensure there are no slowdowns or stopping
in the damper movement along the entire sector. Instructions on
electric connections are given by the control manufacturer and
supplied with the unit.
After checking that all connections and installations work, comprising
check and verify the protection degree IP2x (protection against
The following preliminary checks are essential before proceeding
1. The provided safety systems are present and activated;
2. No foreign matters or dirt should be left close to rotating parts
or in the unit sections;
3. All drains should be free and adequately trapped;
4. Hydraulic circuits should be regularly fed;
5. Coil circuits should be fed and valves open.
unit shall be de-energized as soon as safety devices show their
a. Check for the correct rotating direction of fans, which must be
the one shown on the fan housing by an arrow.
b. Verify the actual current input and compare it with nominal
value (indicated on the unit plate); in case it is higher, it is
necessary to check that:
• Motor-fan group rotates freely by hand
• Fan speed is the prescribed one
• Electric supply is correct.
c. Ensure also that all protective guards on rotating parts are
held in strong position.
If the unit is not operated for long periods before installation,
the following requirements must be observed to preserve fans
operational life:
• If the fans are not operated for long periods in a dry atmosphere,
they are to be started-up and operated at full speed for at least
hour every .
• If the fans are not operated for long periods in a damp
environment (e.g. outdoors), they are to be started-up and
operated at full speed for at least two hours to
move the bearings and allow any condensate that may have
ingressed to evaporate.
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