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air for motor cooling can be freely supplied and exhausted from the motor housing,
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earthing and protecting connections are correct,
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the designed fan rotary speed would not be exceeded (see the unit specifications),
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all bolts, support elements and electric connections are tightened,
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supply cables inside the fan section are away from all movable drive parts and fixed with
adequate holders to electric wires,
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all dampers on ventilating duct system are arranged as designed,
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direction of rotor rotation is compatible with the arrow on the fan housing,
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impulse-activate the fan, in case of reverse rotation direction replace any two phases in the
motor terminal box or change rotation direction on the frequency converter,
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after all the above inspection procedures have been completed, carefully close all inspection
panels on the device,
Do not operate the device if any inspection panel is opened.
14. START-UP AND ADJUSTMENT
Start-up is intended to assess whether the unit conforms with the design and is suitable for use.
The start-up procedure and adjustments of ventilation and air conditioning systems can only be
performed by a qualified crew of personnel competent in start-up, and equipped with a set of basic
measuring instruments. Once the procedure described in “Preparing for start-up” chapter has been
completed, it is possible to approach the first start-up. It is advised to perform the start-up without
the F7 secondary filter cartridges on.
The fan should be started at reduced load and run to reach parameters as near the assumed
operating point as possible. Reduced load can be achieved by decreasing rotational speed thus
using the frequency adjustment on the frequency converter (for AC motors). While increasing the
load, pay attention to constantly control level of the current drawn by the motor.
Make sure that for the design air parameters, the fan motor supplying current is within
its rating.
It is recommended, in the automatic equipment system, to ensure that dampers are pre-
opened on the unit inlet before the fan is started. This has an effect on damper durability
and operation.
Failure to follow the recommendations for the first start-up may lead to the fan motor overload and
its serious damage. Once started check whether:
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there are no alarming noises and unnatural mechanical sounds,
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there are no vibrations of the unit that can be considered to be excessive.
Let the unit operate for about 30 min. Then turn it on and inspect individual sections. Pay special
attention to:
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filters (for damages),
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efficiency of condensate drainage,
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fan unit.
Once the start-up is complete, replace or clean primary filters. To achieve the presumed effects,
among others make sure to carry out adjustments and control measurements.
