34 | © Munters AB, 2019
7. OPERATION
WARNING
Moving parts, disconnect power before servicing.
1. INITIAL START-UP: With electrical power off, verify that the fan propeller turns freely and that all fasteners are
secure. Turn on electrical power and confirm that the fan operates smoothly.
2. ADJUSTMENTS: Set the fan control to the temperature shown on your ventilation system drawing, or to a value
which will provide the desired environmental conditions.
WARNING
Some models of our fans allow to adjust the number of revolutions through inverter (also called
VFD). In case of adjustment made by VFD the installer has to pay particular attention to the following aspects:
• it is necessary that the resistance of the ground line to which the equipment are connected has a very low values
(about 15-20 ohm) in order to avoid high currents that can flow through the motor bearings and damage them.
• It is necessary to install the proper line filters, to avoid interference and allow proper operation of the equipment.
• The minimum frequency of operation of the engines in the case of absence of a forced external ventilation is 30
Hz. In the case of an operating frequency below 30 Hz is necessary to provide an external forced ventilation to
the engine.
It is absolutely normal for the damper door not to open completely. The air flow is calculated in the configuration with the
two doors not completely open but with an angle of 20° between them.
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