Euroclima ZHK Series, Instruction Manual, Page: 101 / 131

Instruction Manual ZHK
100/129 V07-19.0
Figure 198:
Typical vibration curve
The following generally applies:
-
Avoid dropping below minimum speed
-
Pass through the point of resonance quickly on start-up
In partial load, operation it could be that the operating point may coincide with the resonant range.
In such situations, this operation must be prevented on site by small adjustments to the control.
If a
frequency converter is used for running the fan, then the resonant range can be suppressed di-
rectly there.
At AHUs with EUROCLIMA control, the resonant range can be suppressed. For that purpose, the
appropriate setting in the software must be done at the commissioning process.
Permanent operation of fans at inadmissible high vibrations can lead to severe
damage at the AHU and subsequently to damages to property or personnel.
9 Maintenance
EUROCLIMA AHUs are built mostly maintenance free and easy to maintain when required. The
maintenance intervals (see
Table 17
) are indicative for normal operating conditions. Widely differ-
ing applications may require different intervals, ask EUROCLIMA for details. The execution of the
described checks and maintenance needs are necessary to ensure a permanent safety operation
and functionality of the AHU.
The entire AHU and all components must be checked regularly for pollution, corrosion, damage
and fixing and, if necessary, they must be cleaned or repaired.
Depending on the material used and the environmental conditions, it can lead to a superficial cor-
rosion on components. For example, motor, fan shafts, pulleys, bushings, sheet metal cutting
edges etc. The resulting corrosion layer protects the underlying material from further corroding and
does not represent a deficiency of the component or the device. The removal of surface corrosion