Carel Hecu CO2 - Functional Diagrams for Hecu CO2 Configurations; Medium Temperature Configuration Details; Low Temperature Configuration Details

16
ENG
Hecu CO
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 con 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
Technology
R
E
C
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 con 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
Technology
Check
valve
P
P
T
By-pass
DIS
DIS
T
SUC
SUC
Technology
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