Basic Terms - TECH ST-450zPID User Manual

ST – 450 z PID
Below we present the results of tests conducted with the use of the Tech
controller with PID control:
and the same controller without PID control:
Any comments concerning the program should be reported to the boiler's
manufacturer.
Each controller should be set individually for personal needs, depending on the
type of fuel used for burning as well as the type of the boiler. The TECH
company shall not be liable for any incorrect settings of the controller.
I.1.

Basic terms

Firing – The cycle starts after the flue gas temperature has reached the defined
value provided that it does not drop below that level for a period of 30 seconds
(factory-set firing time).
Operation – After completion of firing cycle the controller enters the operation
cycle and a message reading "PID:OPERATION" appears on the display. It is
the basic operation status of the controller where the blowing operation and fuel
feeding are performed automatically following the PID algorithm and the
temperature is fluctuating around the temperature preset by the user. Should
the temperature rise unexpectedly 5°C above the pre-set value a so-called
supervision mode is activated.
Supervision mode– It is activated automatically if the temperature exceeds
the pre-set value by more than 5°C in the operation mode. In such a case the
controller changes PID operation to manual settings (according to parameters
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