Custom" Refrigerants; Introduction; Confi Guration - Carel pRack pR300 Manual De Instrucciones

1.1 Introduction

The pRack structure features the possibility to
confi gure one refrigerant for each suction line and
each condenser line. In version 3.2, a new "CUSTOM"
refrigerant has been introduced.
This refrigerant is confi gured using 12 integer
parameters for the DEW point curve and 12 for
the BUBBLE point curvend 12 for the BUBBLE
temperature-pressure curve (introduced starting in
version 4.0.1).
The parameters are distributed and validated by CAREL
in the same way as for the MPXPRO. To identify the
refrigerant and verify that the data is entered correctly,
ID and 4 CRCs (DEW, BUBBLE
CAREL distributes an
(temperature), BUBBLE (pressure) and GLOBAL),
which need to be entered in the controller, together
with the coeffi cient parameters. The function of the
CRCs is to prevent incorrect data entry or unwanted
modifi cations to the data by the manufacturer. If the
CRC entered by the user does not correspond to the
one generated by the parameters, a serious alarm is
signalled and the rack is prevented from starting.
The refrigerant is unique for all lines; it is not possible
to select gas-custom on diff erent lines and set with
diff erent coecents.
The coeffi cient parameters are available on KSA section
"Gas custom management" at the following path:
Software & support --> Confi guration & Updating
Software --> parametric controller software --> pRack
--> pRack Standard --> Gas custom management.
The custom gas can be confi gured using the
coefficients described above on the pGD terminal,
screens Ffa01...Ffa04 (for versions prior to 4.0.1, screens
Cag16...Cag18) and on the supervisor, only via Modbus
protocol (using registers 300 and 5301...5340) and
starting from version 3.2 of pRack pR300.
1.

"CUSTOM" REFRIGERANTS

1.2 Confi guration
The CUSTOM refrigerant can be assigned to the
suction and condenser lines using the wizard:
or subsequently, on screens Caf04, Cbf04, Daf04 and
Dbf04.
The confi guration screens for setting the refrigerant
parameter are available under Settings -> Custom
Gas (for versions prior to 4.0.1 under Compressors
-> Line 1 -> Advanced).
Screen Ffa01 is used to enter the coeffi cients for DEW
point conversion:
Note
: R448A refrigerant was used in this confi guration
example
Screen Ffa02 is used to enter the coeffi cients for
BUBBLE point conversion:
5
"Gas custom management " +040010030 - 1.2 - 26.06.2019
ENG