Samsung Electronics 254
Piping Diagram
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).
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 3min
Compressor trip (E428) occurs if in this state for 10 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
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)
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