Carel pRack pR300T Manual Del Usuario página 27

If acting on the gas cooler set point, the gas cooler fan temperature set point can be gradually increased until
reaching the maximum allowed limit. This limit is equal to the maximum allowable set point (screen Dab06)
in simultaneous mode, or the value set on screen Eeab29 in sequential mode.
In simultaneous mode, the increase will begin at the same time as the action on the HPV valve set point,
while in sequential mode the increase will begin after having exceeded a settable heat demand percentage
threshold (Eeab29).
If the fl oating condensing function is active (branch D.a.d), this can be disabled when heat recovery is active
(Eeab04), while if this function is not disabled when heat recovery is active, the increase in the gas cooler set
point can be added directly to the outside temperature.
Floating condensing without heat recovery: SP = Text + ΔT (screen Dad06).
Floating condensing during heat recovery (with action on GC): SP=Text + Off set GC, where Off set GC > ΔT.
One fi nal action to maximise heat recovery involves bypassing the gas cooler when the following conditions
are true:
•
bypass is enabled (screen Eeab);
•
percentage of heat demand exceeds a settable threshold (e.g. 90%);
•
the bypassed gas cooler temperature is below a settable threshold (e.g. 20°C).
When these conditions are true, the bypass valve will start modulating according to the calculated bypassed
gas cooler temperature set point, until totally bypassing the gas cooler when this temperature makes it
possible. When heat recovery is deactivated, the HPV valve set point gradually returns to the calculated value
in a set time. The same is true for the gas cooler fan set point.
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ENG
+030220595 - 1.0 - 27.01.2016