BOILER CONTROLLER ST-28N zPID TECH

The ST-28N PID controller is designed for central heating boilers. It controls the CH water circulation pump, hot water pump DHW and blowing (fan). If the boiler temperature is lower than the set temperature, the regulator is in a duty cycle in which the blowing works all the time. If the boiler temperature is equal to or higher than the set temperature, then the regulator is in the backup cycle, and the controller's operation consists in switching on blow-offs with a frequency depending on the user's settings. The operating time and the breaks of blow-offs in support should be selected according to the type of fuel burned in the boiler.

In case of voltage failure, the thermoregulator stops working. When the power supply reappears, the controller returns to work at previously set parameters thanks to the built-in memory. The lack of voltage does not remove the recorded parameters of the thermoregulator.