Carel pRack pR300T Mode D'emploi page 40

ENG
Caution: if the probes used for the calculation are faulty or not connected, the function is disabled and the
corresponding alarm message is shown. In this case, heat recovery is activated based on the request.
When there is a request for heat recovery, the discharge temperature control function is bypassed for a
certain time (start-up time), even if active and with a difference below the threshold; this allows the system
to stabilise after heat recovery is activated.
After the start-up time has elapsed, if the temperature difference remains below the threshold for the
evaluation time, heat recovery is deactivated.
When heat recovery is deactivated due to a low temperature delta, it remains off for a minimum settable OFF
time, after which heat recovery is reactivated, in accordance with the times described above.
The behaviour of the function is illustrated in the figure
HR request
Delta Temp
Min
Delta T. check
HR ON
cod. +030220595 - 1.2 - 13.08.2020
Bypass time Eval time Eval time Min time off Bypass time
Fig. 2.e
14
Time
Eval time