10
EN
ELECTRONICS OPERATION ALGORITHM
The TT PRO T fan activates upon control voltage application to an LT input terminal by an external switch
(e.g. indoor light switch). After the control voltage is off, the fan continues to operate within the set time
period adjustable from 2 to 30 min by the timer. To adjust the fan turn-off delay time, turn the control knob T
clockwise to increase and counter-clockwise to decrease the turn-off delay time respectively (Fig. 30).
WARNING!
The timer circuit is live! Disconnect the fan from power supply prior to any adjustment operations. The fan
delivery set includes a specially designed plastic screwdriver for fan settings adjustments. Use it to change
the turn-off delay time and the humidity set point. Do not use a metal screwdriver, knife, etc. for adjustment
operations not to damage the circuit board.
The TT PRO U (U1) fan (Fig. 32) is equipped with an electronic module TSC (speed controller with an electronic
thermostat) for automatic motor speed control (air flow) depending on the air temperature.
The terminal compartment incorporates 2 control knobs:
• motor speed preset button
• electric thermostat control knob
The LED indicator is placed at the front panel of the fan to show the thermostat operating status.
To set the thermostat threshold, rotate the thermostat control knob clockwise to increase or counter-clockwise
to decrease the temperature set point accordingly.
To set the fan speed (air capacity) rotate the speed control knob in the same way.
The fan operating logic may be based on temperature or timer indications:
Temperature-based operating logic (TT PRO U) is used to keep air temperature to within 2 °C (fan speed
switching will be rare). The fan switches to maximum speed as the temperature reaches the temperature
