It is possible to monitor the temperature of a source and determine if it is unable to supply the required energy; when this occurs, the source is considered degraded; when a source is in this state, it is possible to choose whether to leave it on or switch it off, but the source (or sources) that come after it in order of priority are also activated (see SOURCES PRIORITY).
This makes it possible to support a source that fail to satisfy the system.
For degraded source monitoring function, it is necessary that
The source is equipped with a probe, set to “to control activation”
The source set point settings are correct
To determine whether a source is degraded, the system relies on both temperature and time:
A source is considered “degraded” when for the time set by the Degradation Time, the measured temperature is lower (in heating)/higher (in cooling) than the desired set point by the Delta parameter.
PHOTO TBD
The drop-down menu next to the Degradation Time (expressed in seconds):
INCL WIN/INCL SUM = inclusive in winter and in summer (the degraded source is not removed from the request)
EXCL WIN/INCL SUM = exclusive in winter and inclusive in summer (the request is removed from the degraded source in winter and kept in summer)
EXCL WIN/EXCL SUM = exclusive in winter and in summer (the request is removed from the degraded source)
INCL WIN/EXCL SUM = inclusive in winter and exclusive in summer (the request is kept in winter and removed in summer from the degraded source)
Allows you to choose whether the degraded source can remain switched on or not.
The following diagram illustrates the criteria:
PHOTO TBD
Quando una sorgente è dichiarata "degradata" il sistema:
spegne o lascia accesa la sorgente in base a quanto selezionato
abilita la sorgente (o le sorgenti) che seguono nella scala di priorità (anche queste devono avere i set point impostati con criterio perchè si attivino una volta abilitate)
Lo stato di "degradato" viene rimosso quando la temperatura di sorgente ritorna al setpoint richiesto più il valore di isteresi.
Attenzione
Se il parametro Tempo Degradata è impostato su zero la funzione di determinazione della sorgente degradata è disattivata.
Una volta partito il countdown (Timer degrado), che si può vedere nella sezione “Stato Sorgenti”, non è possibile modificarlo. Se si è messo 600 secondi e si è arrivati a 400 ad esempio e ci si rende conto che sono troppi, mettendo 100 il countdown non passa a 100, ma continua a scendere da 400 secondi.
Se si vuole cambiare bisogna spegnere l’impianto (o quanto meno la richiesta alla sorgente), cambiare il tempo degradata e poi riaccendere.
Nota
Opentherm come sorgente non può degradare, nè come ACS, nè come Riscaldamento/Raffrescamento. Solo le sorgenti 1, 2 e 3 possono degradare tra di loro e con la sorgente Opentherm.
When a source is declared “degraded”, the system:
· Switches the source off or leaves it on according to what has been selected
· Enables the source (or sources) following in the priority scale (these must also have their set points critically set for them to be activated once enabled)
The “degraded” status is removed when the source temperature returns to the required setpoint plus the hysteresis value.
Warning
If the Degradation Time parameter is set to zero, the degraded source determination function is deactivated.
Once the countdown (Degradation Timer) has started, which can be seen in the “Source Status” section, it cannot be changed. For example, if you put in 600 seconds and got to 400, and realise that this is too much, putting in 100 will not change the countdown to 100, but will decrease from 400 seconds.
If you want to change, you have to switch off the system (or at least the request to the source), change the degradation time and then switch back on.
Note
Opentherm as a source cannot degrade, neither as DHW nor as Heating/Cooling. Only sources 1, 2, and 3 can degrade with each other and with the Opentherm source.