Control: Water Temperature; Control: Digital Input; Control: External Signal - Carel pRack pR300T Mode D'emploi

2.1 Control: water temperature

If control is based on the heat exchanger water outlet temperature, the value THRnO is compared against
the specified set point, applying PI control. Screen Eeeab07 can be used to set the proportional coefficient
Kp, expressed as a percentage of demand for each degree difference from the set point, and the value of the
integral factor in seconds.
This PI control thus generates a demand output between 0 and 100%.

2.2 Control: digital input

If control is set to be managed via digital input:
The status of the input associated with the function on screen Eeaa02 will determine either 0% or 100%
demand.

2.3 Control: external signal

An input signal to pRack can also be used to generate a modulating demand output, from 0% to 100%.
Note: whichever of the three modes is selected, heat recovery will be based on the percentage of demand
generated, as described in the following paragraphs.
This screen is used to configure the scheduler.
The function can be activated based on:
•
the heat exchanger water outlet temperature
•
a digital input
•
an external signal.
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ENG
cod. +030220595 - 1.2 - 13.08.2020