Installation and Operating Manual
Page
57
Printed: 02/2015
For maintenance and cleaning work on ATEX units, observe the following:
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Use only tools that conform to EN 1127-1.
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Avoid all ignition sources (see section 1.2.).
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To prevent electrostatic charging, always clean the unit with a damp cloth.
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All work on the de-energized unit must be performed by authorised specialist
technicians in accordance with the German Industrial Health and Safety Ordinance.
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Never perform any work on the unit under explosive atmosphere conditions.
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Avoid all ignition sources.
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To prevent electrostatic charging, wear electrically conductive footwear (conforming to
BGR 132).
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First shut down the unit mechanically and then de-energize it (i.e. disconnect it from all
power sources). Secure the unit against inadvertent restart and then open the housing.
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During standstill, the concentration levels of the processed atmosphere inside the unit
might be elevated, causing an increased risk of explosion.
7.11. Test run
After all work on the air handling unit and before switching it on, the operator in charge of the
unit must ensure that there are no persons standing inside the unit or in its danger area. After
all checks are completed and the unit is ready for operation, perform a test run.
During the test run, the unit must be connected to the overall system. Close all unit doors
and open the dampers. Do not operate the fan against closed dampers.
During the test run, check the following:
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Direction of rotation of fan
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Actual current consumption of all motor phases; compare the actual values with the
values on the rating plate.
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If the measured current consumption is too high, there is a wiring fault. Immediately
shut down the unit.
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Measure the volumetric flow rate and the differential pressure.
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If the air flow rate does not correspond to the unit rating, proceed as follows:
a) Insufficient volumetric air flow
Increase the fan speed by changing the belt pulleys, or increasing-the inverter output
frequency (Hz).
When increasing the fan speed, do not exceed the rated current of the motor. Risk of
damage to motor!
If it is not possible to reach the required volumetric air flow without exceeding the rated
current of the motor, replace the motor with a more powerful one.
Summary of Contents for DIWER EVO DP80 Series
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