Instruction Manual ZHK
108/140
V07-21.0
Resonance at fans
The operation of fans at the resonant frequency (and multiples of it) must be avoided, in order to
prevent high vibration loads. The resonant frequency must be determined at the AHU on site.
shows a typical vibration curve.
Figure 208:
Typical vibration curve
The following generally applies:
-
Avoid dropping below the minimum speed
-
Pass through the point of resonance quickly on start-up
-
No operation in speed ranges of increased vibrations (resonance)
During partial load operations, it could be that the operating point may coincide with the resonant
range. In such situations, this operation must be prevented on site through small adjustments to
the control.
If a frequency converter is used for running the fan, then the resonant range can be
suppressed directly there.
At AHUs with EUROCLIMA control, the resonant range can be suppressed. For that purpose, the
appropriate setting of the software must be done at the commissioning process.
9 Maintenance
EUROCLIMA AHUs are built mostly maintenance free and are easy to maintain when required.
The maintenance intervals (see
) are indicative for normal operating conditions. Widely
differing 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 opera-
tion and functionality of the AHU.
The entire AHU and all components must be checked regularly for pollution, corrosion, damage
and fixing. If necessary, they must be checked, 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
Summary of Contents for ZHK
Page 1: ...ZHK INSTRUCTION MANUAL...
