Supplementary Actions; Sequential Mode With Thresholds - Carel pRack pR300T Manual Del Usuario

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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.
These supplementary actions can be implemented in sequential mode independently, or simultaneously,
giving priority to gas cooler pressure. The actions are performed after a settable delay from activation of heat
recovery.

3.1 Sequential mode with thresholds

If choosing to activate the supplementary actions sequentially, each action can be confi gured separately
using a specifi c 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 confi gured on screen Eeab28
and described in the table below.
+030220595 - 1.0 - 27.01.2016
3.

SUPPLEMENTARY ACTIONS

Setp.Min% (barg)
Setp.100% (barg)
Time at min setp (s)
Incr. step (barg)
Time betw. incr. (s)
Minimum HPV valve set point con with
minimum heat recovery demand
Minimum HPV valve set point con with
maximum heat recovery demand
Tim to increase set point from current
value to new minimum
Step value to increase set point by
Time between successive set point
increases
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