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  1.6 PROGRESSIVE HEATING OF BOILER ELEMENTS

Specifications:

To avoid over-consumption on boiler start-up, the heating elements are heated progressively, and stopped progressively when the boiler is stopped.

This operating principle is shown by the following timing diagram:

An “On” (MA) button authorizes the activation of the first heating element (S1). After a time-delay T, the second element (S2) starts up. After the same time-delay, the third elements starts up (S3), then the fourth element (S4) again after time-delay T. An “Off” (AR) button deactivates S1. The three other elements are progressively deactivated after time-delay T with each deactivation of the preceding element.

Description of the inputs/ouputs:

Model Required:

No specific condition:

SR2 B121 BD (24 V DC) or SR2 B121 JD (12 V DC) for example.

Program Description:

In principle, time delay T is identical for the activation/deactivation of all the heating elements. The program includes three TIMER function blocks. The function to perform according to the specifications requires entering the same time-delay value in the three blocks.

As a result, if the user wants to modify one of them, he/she will have to enter the new selection in the three blocks.