Custom" Refrigerants; Introduction; Confi Guration - Carel pRack pR300 Bedienungsanleitung

ENG
1.

"CUSTOM" REFRIGERANTS

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 curve.
The parameters are distributed and validated by CAREL in the same way as for the MPXPRO. To recognise the
refrigerant and verify correct data entry, CAREL distributes an ID and three CRCs (DEW, BUBBLE and GLOBAL)
that 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 the same for all the lines, i.e. a custom gas cannot be set on diff erent lines and confi gured with
diff erent coeffi cients.
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.
Gas custom confi guration , through the above-mentioned coefi ccients, is possible either on the pGD display
(masks Cag16...Cag18) or from the supervisor, via MODBUS protocol only (registers 300 and 5301...5326) starting
from pRack pR300 version 3.2
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 Compressors -> Line 1 ->
Advanced.
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"Gas custom management " +040010030 - 1.0 - 02.12.2015