Supplementary Actions; Sequential Mode With Thresholds - Carel pRack pR300T Mode D'emploi

ENG
As well as the activation of heat recovery, other actions are implemented to increase the availability of heat
that can be recovered:
•
increase the minimum set point for HPV valve control (pressure in the GC);
•
increase the minimum gas cooler set point (reduce fan speed);
•
complete or partial bypass of the gas cooler.
prack pR300T offers the possibility to increment the two set points simultaneously or independently. This is
set on screen Eeab25, under parameter
SIMULTANEOUS, as per screen
SEQUENTIAL
Moreover, completion of the previous action can be verified (available only for SW versions > 4.0.0) by setting
the "Verify end step" parameter to YES or executing them at the same time, giving priority to the gas cooler
pressure. As per screen.
The increment set point actions are performed after a settable delay from activation of heat recovery, default 120s.

3.1 Sequential mode with thresholds

If choosing to activate the supplementary actions sequentially, each action can be configured separately
using a specific set of parameters. The actions are applied prior to increasing the minimum set point for the
HPV valve; subsequently, the gas cooler set point is increased. The minimum set point for the HPV valve is
increased based on the parameters configured on screen Eeab28 and described in the table below.
cod. +030220595 - 1.2 - 13.08.2020
3.

SUPPLEMENTARY ACTIONS

"Azioni su setpoint valvola HPV e ventil. Gas cooler in
Setp.Min% (barg)
Setp.100% (barg)
Time at min setp (s)
Ric.RC max setp. (%)
Incr. step (barg)
Time betw. incr. (s)
Min. HPV valve set point con with minimum heat
recovery demand
Min. HPV valve set point con with maximum heat
recovery demand
Tim to increase set point from current value to new
min.
Heat recovery request value corresponding to the
maximum HPV valve set point
Step value to increase set point by
Time between successive set point increases
16
modo":