16
ENG
Hecu
C
O
2
+0300085EN rel. 2.2 - 07.05.2019
2.9 Functional
diagrams
There are two confi gurations, one for medium temperature applications
and one for low temperature applications. The main diff erence involves
the double suction line required for low temperature applications; in this
case, the RPRV (fl ash gas) valve is optional.
There are other alternative confi gurations that require a system to inject
oil via an EEV (using an external driver) or capillary tube.
1. Medium temperature confi guration
The confi guration defi ned for medium temperature applications involves
Hecu CO2 managing a DC compressor, with up to 2 on-off fans, an
electronic expansion valve for gas cooler pressure control (HPV) and an
electronic expansion valve for managing receiver pressure (RPRV). The
serial network allows monitoring and interaction with up to 5 evaporators
equipped with MPXPRO or UltraCella controllers, and a CAREL EEV
electronic expansion valve.
P
P
T
HPV
RPRV
By-pass
Check
valve
up to 5
35 barg
DIS
GC
T
SUC
T
OUT, GT
SUC
P
REC
2
2
2
2
T e c h n o l o g y
REC
Fig. 2.l
Symbol
Description
TSUC
Suction temperature
PSUC
Suction pressure
TDIS
Discharge temperature
Tout,GC
Gas cooler temperature
PGC
Gas cooler pressure
PREC
Receiver pressure
2. Low temperature confi guration
The confi guration defi ned for low temperature applications involves
Hecu CO2 managing two DC compressors (LT/DC and parallel), with up
to 2 on-off fans, an electronic expansion valve for gas cooler pressure
control (HPV) and an optional electronic expansion valve for managing
receiver pressure (RPRV). It should be noted that in this confi guration, the
RPRV (fl ash gas) valve is optional, as receiver pressure control is managed
by the parallel compressor.
The serial network allows monitoring and interaction with up to 5
evaporators equipped with MPXPRO or UltraCella controllers, and a
CAREL EEV electronic expansion valve.
P
P
T
HPV
L1: PAR
L2: LT
By-pass
Check
valve
up to 5
35 barg
DIS
GC
T
SUC
T
OUT, GT
SUC
2
2
2
T e c h n o l o g y
Check
valve
P
P
T
By-pass
DIS
DIS
T
SUC
SUC
T e c h n o l o g y
P
REC
Fig. 2.m
Symbol
Description
TS,LT
Suction temperature LT
PS,LT
Suction pressure LT
TD,LT
Discharge temperature LT
PD,LT
Discharge pressure LT
TS,PAR
Suction temperature PAR
PS,PAR
Suction pressure PAR
TD,PAR
Discharge temperature PAR
Tout,GC
Gas cooler temperature
PGC
Gas cooler pressure
PREC
Receiver pressure
Содержание Hecu CO2
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