MP2000 AIR CONDITIONERS

Software per condizionatori d'aria • EPROM CZX.... • Software for air conditioners

FUNZIONE FREE-COOLING (sistema FC)

Disponibile solo per unità DXW/FC (eprom CZX).

La funzione Free-cooling esclude la possibilità di in- stallare la sonda di temperatura aria esterna.

Per abilitare la funzione è necessario quanto segue:

- installare la sonda di temperatura ingresso acqua sull'in- gresso J2 - B4 della Board "A".

-da "Unit configuration" selezionare "Probe selection" ed abilitare l'ingresso "Inlet water temp. Y".

-sempre da "Unit configuration" selezionare "Analog output 1" ed impostare "Cooling+freecooling".

-impostare i nuovi set relativi ai compressori (xdz) come indicato precedentemente.

Il sistema free-cooling funziona parallelamente ai com- pressori; in questo modo è possibile effettuare sia un preraffreddamento dell'aria, utilizzando i compressori solo per fornire la capacità frigorifera necessaria al totale bilan- ciamento del carico (free-cooling parziale), o un raffredda- mento totale con i compressori esclusi (free-cooling totale). Il sistema si attiva quando c'è richiesta di raffreddamento e la differenza (DT) tra la temperatura ambiente e la tempe- ratura dell'acqua in ingresso all'unità è uguale o superiore a 2°C (valore fisso).

In questa condizione il sistema chiude il contatto J6 - C12 della Board "A" che abilita l'avviamento delle pompe del gruppo di pompaggio. Parallelamente il segnale proporzio- nale P1 apre la valvola di Free-cooling.

Il segnale P1 si attiva al 40% del valore e ricade al 30%. Il sistema Free-cooling viene disabilitato quando la diffe- renza tra la temperatura dell'acqua in ingresso all'unità e la temperatura ambiente è di 1,5°C (valore fisso).

FREE-COOLING FUNCTION (FC system)

Available only for DXW/FC units (eprom CZX).

The free-cooling function excludes the possibility of the outdoor air temperature sensor installation.

To enable the function follows these instructions:

-install the water inlet temperature sensor on input J2 - B4 of Board "A".

-from "Unit configuration" select "Probe selection" and enable the inlet "Inlet water temp. Y".

-from "Unit configuration" select "Analog output 1" and enable "Cooling+Freecooling".

-Set the new compressors values (xdz) as indicated in the previous page.

The Free-cooling system running is parallel to the com- pressors working; in this way it is possible to make a pre- cooling of the handled air, activating the compressors only to provide the cooling capacity necessary for the full bal- ance of the load (partial free-cooling), or a total cooling without compressors (total free-cooling).

The system activates when there is cooling request and the difference (DT) between the room temperature and the water inlet temperature is equal or higher than 2°C (fixed value).

In this condition the system closes the contact J6 - C12 of the Board "A" for the remote pumping group water pump enabling.

In the same time, the P1 cooling proportional signal opens the free-cooling valve.

The P1 signal is active at 40% of the value and deactivates at 30%.

The free-cooling system is deactivated when the difference between the water inlet temperature and the room tem- perature is 1,5°C (fixed value).

FREE COOLING ON

FREE COOLING OFF

-2 -1 0 1

Fig.47

LOGICA DI FUNZIONAMENTO SISTEMA FC

L'integrazione del sistema FREE-COOLING con il circuito acqua delle unità PEGASUS DXW e il collegamento ad un dissipatore esterno (CVE/H) con l'interposizione del grup- po di pompaggio (PWU) permette di realizzare un circuito free-cooling.

Il sistema è gestito dal controllo a microprocessore MP2000 (14) incorporato nell'unità.

La sonda (5) fornisce all'MP2000 la temperatura della miscela glicolata in arrivo dal dissipatore esterno (3) per permettere il continuo confronto con la temperatura del- l'aria di ritorno.

Quando la temperatura dell'aria di ritorno risulta di 2°C più alta di quella della miscela glicolata, il sistema MP2000 attiva la valvola (6) che modula la quantità d'acqua nella batteria (1) per realizzare un raffreddamento gratuito com- pleto o parziale.

80

2

3

4 DT x (°C)

FC SYSTEM WORKING LOGIC

This working mode can be obtained by integrating the FREE-COOLING system with the water circuit of the PEGASUS DXW units and connecting them to an external dissipation system (dry cooler CVE/H) and to a pumping group (PWU).

The system is fully managed by the MP2000 microproces- sor control system (14) installed as standard on the unit. The sensor (5) transmits the temperature of the glycol solution coming from the external dry cooler (3) to the MP2000 allowing continuous comparison with the return air temperature.

Whit a return air temperature 2°C higher than the glycol solution one, the MP2000 system activates the valve (6) to modulate the quantity of water passing through the coil (1) achieving a total or partial free cooling of the air being handled .

RC GROUP - 149_ItEn.0102

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Dell MP2000 manual Logica DI Funzionamento Sistema FC, FC System Working Logic
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