TERMISTAT-3-AL is a microclimate controller that controls work of fans and heaters depending on temperature and time (function of periodical ventilation). It has got one electronic control output with fluent power control (Section 1).

The mode of operation and other crucial parameters of control are set by means of eight micro-switches located inside the controller’s housing. Other parameters (settings) are stored in the memory of the controller. Their selection is made during the controller’s operation by means of buttons.

The temperature is measured by means of digital temperature sensors.

The controller has got two relay alarm outputs and it indicates alarms e.g. when the set temperature thresholds are exceeded (temperature is too low or too high), in case of power supply failure, temperature measurement line damage etc.

Wiring diagram of the TERMISTAT-3-AL controller with sensors and modules control:

Characteristics:

• temperature measurement is made by means of digital sensors, the possibility of connection up to 4 sensors TEMP-201, one sensor is included in the set,

• one built-in ‘fluent’ control output – it enables the multistage (100 stages) control of single-phase fans or infrared illuminators with current up to 3A,

• large, easy to read three-digit LED display,

• a relay alarm output (NO, NC and COM contacts), 24V, 200mA,

Functions:

• choice of the mode of outputs operation (ventilation/heating),

• change of the stage of section operation and thermal alarms by means of one parameter: preset temperature,

• defining the minimum and maximum control of the fluent section,

• a 'forbidden range' – elimination of the part of the fluent section control range that is energy-intensive and adverse for work of fans,

• periodical ventilation: setting the cycles and levels of ventilation, bandwidth of ventilation (shortening the time of ventilation together with lowering below preset temperature in the building),

• alarm function i.a. when temperature thresholds are exceeded (temperature is too low or too high), when the control process has been stopped, in case of power supply failure, temperature measurement line damage etc.,

• the possibility of declaring the sensor of outside temperature (i.a. in order to correct an alarm threshold or when temperature is too high).