Vents VENTS TT Series, User Manual, Page: 10 / 28

10
EN
CONTROL LOGIC
TT XXX T
fan starts running after the external switch supplies control signal to the LT input terminal (for
example, during turning the light on).
After removal of the control signal the fan continues to run within the set time (adjustable with the turn-off
delay timer from 2 to 30 minutes).
To adjust the fan turn-off delay time, rotate the control knob T clockwise to increase and counter-clockwise to
decrease the turn-off delay time respectively (Fig. 31).
Warning!
The timer circuit is under mains voltage. Disconnect the fan from power supply prior to any
adjustment operations. The fan delivery set includes a specially designed plastic screwdriver for adjustment of
the fan parameters. Use exclusively the delivered plastic screwdriver to adjust the turn-off delay time. Do not
use a metal screwdriver, knife, etc. for adjustment operations not to damage the circuit board.
The
TT XXX U (U1)
fan is equipped with an electronic TSC control unit (speed controller with electronic
thermostat) for automatic speed control (air flow control) depending on the air temperature (Fig. 33).
The terminal box cover incorporates 2 control knobs:
• for setting the fan speed;
• for setting the thermostat set point.
The thermostat LED light is located on the fan casing.
The thermostat LED glows as air temperature exceeds the set point.
To set the thermostat set point rotate the temperature control knob clockwise to increase or counter-clockwise
to decrease the temperature set point accordingly.
To set the fan speed (air flow) rotate the speed control knob in the same way.