Samsung Electronics 252
Piping Diagram
Compression ratio protection
▪ Purpose
Prevent compressor damage due to abnormal operation.
Failure may occur due to an overload of compressors if the compression ratio is high.
▪ Concept
▪ Control specifications in detail
- If the compression ratio is high,
1st step Increase of the superheat degree : The superheat degree for compressor suction is increased .
2nd step Increase of the minimum compressor frequency : The minimum compressor frequency is increased to
the predefined model-specific frequency.
3rd step Comp Trip : If in critical state for 10 min, stop the compressors and trigger an error (E428).
Compression ratio
Hz Hold area
Hz Down area
HP Down area
Normal operation
Hz Hold release
9.5
Hz Down release
10.5
HP Down release
11.5
Normal Operation
Cooling : Target SH 6 K & Target HP 28kgf/cm
2
,g
Heating : Target SH 4 K
Cooling : Minimum Hz increases if in this state for 3 min
SH control & Target HP release
Min Hz release
Compression ratio
※△ P =High Pressure –Low Pressure
△P kgf/cm
2
,g
or 1.5
1.7
1.9
△P 8kgf/cm
2
,g
& 2.0
Compressor trip (E428) occurs if in this state for 10 min
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)
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