Vents VKM 100, User Manual, Page: 8 / 12

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VKM
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Fig. 4
CONTROL
The VKM P fans with a built-in electronic module
The electronic module is designed for smooth control of fan impeller rotation speed (air flow). The speed is controlled with the speed
control knob 9 (Fig. 1).
The VKM Un fans with a temperature and speed controller
(see Fig. 1).
The controller is designed for air temperature control and fan speed control depending on ambient air temperature 10. The speed
is controlled with the speed control knob 9 and the temperature control knob 10. The VKM Un fans are equipped with an external
temperature sensor fixed on a 4 m cable.
The cover of the terminal box incorporates the following controls:
• fan speed control knob 9
• thermostat control knob 10 to set the thermostat temperature threshold
• on/off LED light indicator 11
• thermostat LED light indicator 12
Operation algorithm of VKM Un fans
Set the thermostat temperature threshold with a thermostat control knob 10. Switch on the fan, then set the fan speed with the speed
control knob 9. The fan on/off light indicator 11 lights up. The controller switches the fan to the maximum speed (maximum air flow)
as the temperature rises and crosses the thermostat setpoint. The thermostat light indicator 12 glows if the temperature is above the
thermostat setpoint. If the temperature falls 2 °C below the thermostat setpoint, the fan reverts to the preset lower speed. This prevents
frequent speed changeovers during operation with the temperature close to the threshold value. This control logic enables tracking
temperature fluctuations and respond to the temperature change with accuracy up to 2 °C. The rate of the speed switching depends
exclusively on the air temperature fluctuations.
TECHNICAL MAINTENANCE
DISCONNECT THE UNIT FROM POWER SUPPLY BEFORE
ANY MAINTENANCE OPERATIONS!
The technical maintenance includes periodic cleaning of the surfaces from accumulated dust and dirt. Use a soft dry brush or a vacuum
cleaner to remove dust.
The impeller blades require thorough cleaning once in 6 months.
To do this, unscrew the self-tapping screws 3 and remove the cover 2 (Fig. 1).
Clean the impeller blades with a soft cloth wetted in mild water detergent solution. Avoid liquid dripping on the motor.