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EN
OPERATION GUIDELINES
The fan is designed for connection to AC single phase 220...240 V, 50/60 Hz power mains. The fans
models VK 315 / VKS 315 are designed for connection to 220...240 V, 50 Hz power mains.
The fan is designed for continuous operation always connected to power mains.
Air flow direction in the system must match the pointer direction on the fan casing.
Ingress protection rating against access to hazardous parts and water ingress IP X4.
The fan is rated for operation at the ambient temperature ranging from +1 °C up to +45 °C.
Transported air temperature:
VK 100/ VK 100 Q/ VK 125/ VK 125 Q/ VK 150: from 25 °C up to +55 °C;
VK 200/ VK 250/ VK 250 Q/ VK 315: from 25 °C up to +50 °C;
VKS 200/ VKS 315: from 25°C up to +45 °C.
The fan requires no grounding.
ELECTRONICS OPERATING LOGIC
The VK U (U1) model, fig. 11 is equipped with an electronic speed controller with electronic thermostat
TSC for automatic speed control (air flow regulation) depending on air temperature.
The terminal compartment incorporates 2 control knobs:
for setting the motor speed;
for setting the electronic thermostat set point.
The thermostat operation light indicator is located on the fan cover.
To set the thermostat threshold rotate the thermostat control knob clockwise to increase or counter
clockwise to decrease the temperature set point.
To set the fan speed (air capacity) rotate the speed control knob in the same way.
The fan has a temperature based and timer based control logic.
temperature based control logic (VK U): to maintain air temperature with accuracy to within 2 °C. The fan
changes its speed rarely. As air temperature rises up to the set thermostat point, the fan switches to high
speed. As air temperature drops down 2 °C below the set thermostat point or if the initial air temperature is
4
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