Dell MP2000 User Manual

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Brand: Dell

Category: Air Conditioner

Type: Operation & user’s manual for Dell MP2000

Pages: 182 (1.12 Mb)

Download Dell MP2000 Operation & user’s manual

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RC GROUP - 149_ItEn.0102
MP2000 AIR CONDITIONERS
Software per condizionatori d'aria a pompa di calore e Roof Top EPROM CPX....
Software for heat pump air conditioners and Roof Top
LOGICA DI SBRINAMENTO PER POMPA
DI CALORE
Configurazione DXA (con "Condenser type" = AIR).
Durante il funzionamento invernale, in heating mode, a
seconda delle condizioni ambientali esterne , può rendersi
necessario lo sbrinamento dello scambiatore esterno.
Lo sbrinamento ha lo scopo di rimuovere il ghiaccio o la
brina formatasi sullo scambiatore durante il funzionamento
per ripristinarne le condizioni ottimali di scambio termico.
Il sistema MP2000 prevede due tipi di sbrinamento, secon-
do le condizioni dellaria esterna e le impostazione di alcuni
set di funzionamento. Si può avere sbrinamento ad aria
con sola ventilazione dello scambiatore esterno e sbrina-
mento per inversione di ciclo.
I parametri utilizzati (modificabili in "Program sets") sono
i seguenti:
Defrosting limit (5
o
C)
Valore di temperatura aria esterna che de-
termina il tipo di sbrinamento.
Defrosting cycle (15 minuti)
Definisce lintervallo di tempo minimo tra
uno sbrinamento e laltro quando, in partico-
lari condizioni, il microprocessore non può
determinarlo (es. sonde guaste).
Defrosting time (6 minuti)
Definisce la durata massima del ciclo di
sbrinamento.
Pressure defrost stop (2000 kPa)
Valore di pressione di condensazione oltre-
passato il quale, nel caso di sbrinamento a
gas, si ha la fine del ciclo di sbrinamento.
Defrost with main fan on (Y)
Con questo parametro è possibile disabilitare
il funzionamento del ventilatore di tratta-
mento durante lo sbrinamento a gas. Nel
caso di sbrinamento ad aria questo set è
ininfluente e il ventilatore rimane acceso.
Type of refrigerant (R22)
Mediante questo parametro selezionabile
nei "General Parameters" è possibile sele-
zionare il tipo di gas refrigerante utilizzato
nellunità.
CONDIZIONI PER LO SBRINAMENTO.
Il sistema MP2000 controlla costantemente i principali
parametri di funzionamento della macchina (pressione di
aspirazione e di mandata, temperatura aria esterna ecc.).
Una particolare routine di calcolo gestisce gli sbrinamenti
in modo ottimale con modalità che permettono un aumento
dellefficienza globale dellimpianto.
Gli sbrinamenti possono avvenire solo se il valore
della pressione di aspirazione è inferiore a 350 kPa.
Il tempo tra uno sbrinamento e il successivo (dello stesso
circuito frigorifero) non può essere inferiore al set
"Defrosting cycle".
Durante questo periodo, se la pressione di aspirazione
scende sotto il valore di 50kPa, viene effettuato uno sbrina-
mento (30 secondi dopo che la pressione è scesa sotto i 50
kPa).
Se questa situazione si ripresenta 3 volte in 45 minuti, il
compressore/i del relativo circuito frigorifero viene/vengo-
no bloccato/i in allarme di bassa pressione (AL07 / AL20).
DEFROSTING LOGIC FOR THE HEAT
PUMP UNITS
Configuration DXA (with "Condenser type" = AIR)
In winter, when run in heating mode and based on outdoor
environmental conditions, some defrosting cycles may be
necessary for the external exchanger.
The function of defrost is to remove ice and hoarfrost that
could form on the exchanger while running, in order to reset
optimum thermal exchange conditions.
The MP2000 system provides two types of defrost, based
on the external air conditions and the setting of some
operating sets: an air defrost, using only the external
exchanger ventilation, and defrost through a reverse cycle.
The used parameters (that can be modified in the "Pro-
gram sets) are the following:
Defrosting limit (5
°
C)
External air temperature value, determining
the type of defrost.
Defrosting cycle (15 minutes)
Defines the minimum time interval between
a defrosting and the following one when, in
particular conditions, the microprocessor in
not able to work in automatic mode (eg.
sensors failure).
Defrosting time (6 minutes)
Defines the maximum defrosting cycle dura-
tion.
Pressure defrost stop (2000 kPa)
Condensation pressure value: if exceeded,
in the situation of a gas defrost, the defrost-
ing cycle is stopped.
Defrost with main fan on (Y)
Through this parameter, it is possible to
deactivate the main fan during a gas defrost
cycle. In the situation of air defrost, this
setting is negligible and the fan remains
always ON.
Type of refrigerant (R22)
Through this parameter (selectable in the
"General Parameters") it is possible to se-
lect the type of refrigerant used for the unit.
DEFROSTING CONDITIONS
The MP2000 system constantly controls the main running
parameters of the machine (suction and delivery pressure,
external air temperature etc.).
A particular calculation routine handles defrosting properly,
through some modes that allow an increase in the global
plant efficiency.
Defrosting can be carried out only if the suction pres-
sure value is below 350 kPa.
The time interval between a defrosting and the following
one (on the same cooling circuit) may not be lower than the
"Defrosting cycle" set.
During this period, if the suction pressure drops below
50kPa, a defrosting is carried out (30 seconds after pres-
sure has dropped below 50kPa).
If this situation occurs three times in 45 minutes, the relative
cooling circuit compressor(s) is/are blocked by a low pres-
sure alarm (AL07/AL20).