3.5.13 Refrigerant R000
If the refrigerant used cannot be found in the list of refrigerants - see subsection 6.4.4. Plant
– you can select a user defined refrigerant designated R000 (the R000 designation does not
refer to any known refrigerant).
Before selecting R000 in the picture Setup/Configuration/Plant first enter the refrigerant curve
data for the refrigerant used in the picture Setup/Configuration/R000:
Def. Refrigerant R000
Temp.: Press.
(ABS):
-90°C/R 00.00 bar
-85°C/R 00.00 bar
-80°C/R 00.00 bar
... ...
80°C/R 00.00 bar
Table 30: Definition of refrigerant R000
For bar/°C, enter the pressure as absolute pressure in 1/100 bar. Enter a pressure value for
each interval of 5°C between -90°C and +80°C. Each pressure value in the picture must be
given a certain value.
Pressure can be entered in the range between 00.00 and 99.99 bar. The table has been ini-
tialised to 00.00 bar.
3.6. Compressor control - chiller functions
Please note that when using the chiller functions described in this section there are certain
limitations in the use of some of the other Unisab III functions, e.g. oil cooling functions.
• When the chiller function Level control LP/HP or Expansion control DX is used it is not
possible to use the By-pass function - and vice versa.
• When the chiller function Level control LP/HP or Expansion control DX or the By-pass
function is used it is only possible to use the following two oil cooling functions:
- Water cooling for reciprocating compressors
- Intermediate liquid injection for two step reciprocating compressors
All other Oil cooling functions are blocked and cannot be used.
• When the chiller function Flow condenser is used it is not possible to use the Cap
down blocked function - and vice versa.
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
129/319
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