Hydroponic Fan Speed And Temperature Controller

This Hydroponic Fan Speed And Temperature Controller is equipped with an electronic temperature and speed control unit and automatically changes the

speed (airflow rate) with respect to the temperature in the ventilation duct or in the premises.

The front panel of the controller has the following controls and indicators:

Speed control knob for low speed setting

Temperature control knob for temperature setting

Thermostat operating indicator (LED light)

3m long probe attached

Set the desired air temperature (thermostat set point) by turning the thermostat control knob to the airflow rate desired by turning the speed control knob.

If the air temperature increases above the thermostat set point the fan switches to the high speed (maximum airflow rate). If the temperature decreases below the thermostat set point  the fan switches to the pre-set lower speed.

To avoid frequent motor speed switches when the air temperature in the duct is equal to the set temperature point, the speed switch delay is activated. There are two switch delay patterns for various cases.

The temperature sensor-based feedback delay:

The motor switches to high speed as the air temperature exceeds 2 ° C above the set thermostat set point.

The motor reverts to the pre-set lower speed as the air temperature drops below the thermostat set point. This pattern is used to keep air temperature to within 2 ° C In this case the motor speed switches are rare.

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