MP2000 AIR CONDITIONERS

Sistema di controllo a microprocessore per condizionatori d'aria • Air conditioners microprocessor control system

AL20 - Bassa Pressione Compressore 2

Programma condizionatori

Scheda Board B ingresso ID 3 da pressostato on/off. Compressore fermo: l’allarme interviene se l’ingresso ri- mane aperto consecutivamente per il tempo impostato nel parametro "Low press. alarm delay time".

Compressore in funzione: l’allarme interviene quando la somma dei tempi (anche non consecutivi) in cui il contatto rimane aperto raggiunge il tempo impostato nel parametro "Low press. alarm delay time".

Il conteggio viene azzerato se il compressore si ferma e l’ingresso è chiuso, oppure se l’ingresso rimane chiuso per un tempo superiore a 3 minuti consecutivi.

Programma Pompa di calore

Scheda Board A ingresso analogico B 8 da sonda bassa pressione.

Funzionamento in raffreddamento:

La logica è la stessa precedentemente descritta per il programma condizionatori, ma, invece dell’ingresso digita- le viene utilizzato l’ingresso analogico B 8 (pressione di aspirazione).

L’equivalente dell’apertura del contatto si ha se il valore della pressione di aspirazione scende al di sotto del set "Alarm low pressure (cool pos)", mentre la richiusura si ha quando la pressione risale di 50 kPa (valore fisso).

Funzionamento in riscaldamento:

Configurazione DXA (con "Fan condenser" = AIR): Compressore fermo: l’allarme interviene se il valore della pressione di aspirazione scende al di sotto di 50kPa (fissi), con un differenziale di 50kPa, per il tempo impostato nel parametro "Low press. alarm delay time".

Compressore in funzione: l’allarme interviene quando il valore della pressione di aspirazione scende al di sotto di 50kPa (fissi), con un differenziale di 50kPa, per un tempo di 60 secondi (fissi).

3 interventi in un periodo di 45 minuti determinano il blocco del Compressore.

Funzionamento in riscaldamento:

Configurazione DXW (con "Fan condenser" = WATER): Compressore fermo: l’allarme interviene se il valore della pressione di aspirazione scende al di sotto di 50kPa (fissi), con un differenziale di 50kPa, per il tempo impostato nel parametro "Low press. alarm delay time".

Compressore in funzione: l’allarme interviene quando il valore della pressione di aspirazione scende al di sotto di 350kPa (fissi), con un differenziale di 50kPa, per un tempo di 60 secondi (fissi).

3 interventi in un periodo di 45 minuti determinano il blocco del Compressore.

Viene fermato il Compressore 2.

Remotizzazione allarme con contatto pulito su scheda Board B uscita C6.

Ripristino Manuale.

AL21 - Sonda Umidità Guasta

Scheda Board A ingresso analogico B 5 (Con Probe Room humidity = Y).

L’allarme interviene quando il valore rilevato dalla sonda di umidità ambiente è al di fuori del campo di misura da 0/ 100% rH, con un ritardo di intervento fisso di 60 secondi. Vengono inibite tutte le funzioni di controllo dell’umidità.

Ripristino automatico.

AL20 – Compressor 2 Low Pressure

Air Conditioner Program

Board B, input ID 3 from on/off pressure switch. Compressor stopped: the alarm is activated if the input remains open consecutively for the time set in the "Low press. alarm delay time" parameter.

Compressor running: the alarm is activated when the sum of the periods of time (also nonconsecutive) during which the contact remains open reaches the time set in the "Low press. alarm delay time" parameter.

The count is reset if the compressor stops and the input is closed, or if the input remains closed for a period exceeding 3 consecutive minutes.

Heat Pump Program

Board A, analog input B 8 from low pressure sensor. Running during cooling:

The logic is the same as the one described above for the air conditioner program but, analog input B8 (suction pres- sure) is used instead of the digital input.

To obtain the equivalent of the contact opening, the suction pressure value shall drop below the "Alarm low pressure (cool pos) set", while closing requires a rise in pressure of 50kPa (fixed value).

Running during heating:

DXA Configuration (with "Condenser type"= AIR): Compressor stopped: the alarm is activated if the suction pressure value drops below 50 kPa (fixed), with a differen- tial of 50kPa, for the time set in the "Low press. alarm delay time" parameter.

Compressor running: the alarm is activated when the suction pressure value drops below 50 kPa (fixed), with a differential of 50kPa, for 60 seconds (fixed).

The compressor is blocked if three activation occur in 45 minutes.

Running during heating:

DXW Configuration (with "Condenser type" = WATER): Compressor stopped: the alarm is activated if the suction pressure value drops below 50 kPa (fixed), with a differen- tial of 50kPa, for the time set in the "Low press. alarm delay time" parameter.

Compressor running: the alarm is activated if the suction pressure value drops below 350 kPa (fixed), with a differ- ential of 50kPa, for 60 seconds (fixed).

The compressor is blocked if three activation occur in 45 minutes.

Compressor 2 is stopped.

Alarm remotization with voltage free contact on Board B, output C6.

Manual reset.

AL 21 – Failure of the Humidity Probe

Board A, analog input B5 (with Probe Room Humidity = Y) The alarm is activated when the value measured by the room humidity probe is out of range (0/100 % r.H.), with a fixed delay of activation of 60 seconds.

All of the humidity control functions are inhibited. Automatic reset.

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Dell MP2000 manual AL20 Bassa Pressione Compressore Programma condizionatori, AL21 Sonda Umidità Guasta

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