Samsung AM080FX A Series Service Manual page 333

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-5 Protective control (cont.)
- If the compression ratio is low,
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
3rd step Comp Trip : If in critical state for 10 min, stop the compressors and trigger an error (E428).
Compression ratio
8kgf/cm 2 ,g
△P
kgf/cm 2 ,g
△P
※△ P =Hig h Pressure –Low Pressure
Samsung Electronics
Normal Operation
& 2.0
1.9
1.7
Cooling : Target SH 6 K & Target HP 28kgf/ cm
Heating : Target S H 4 K
or 1.5
Cooling : Minimum Hz increases if in this state for 3 min
Compressor trip (E428) occurs if in this state for 10 min
model-specific frequency.
SH control & Target HP release
Min Hz release
2 ,g
352