Samsung Electronics 230
Piping Diagram
Compression ratio protection
ƒ Purpose
Prevent compressor damage due to abnormal operation.
Failure may occur due to an overload of compressors if the compression ratio is high.
Compr
essor failure may occur due to poor lubrication if the compression ratio is low.
ƒ Concept
If the compression ratio is high, the compressor frequency is lowered to decrease the ratio.
If the compression ratio is low, the superheat degree
for compressor suction is raised and the compressor frequency is increased.
This will increase the compression ratio.
Compression ratio = (High Pressure(kgf
/cm2,g) + 1.03) / (Low Pressure(kgf/cm2,g) + 1.03)
ƒ Control specifications in detail
- If the compression ratio is high,
1st step Hz hold : The current frequency is fixed. (It is possible to low
er the frequency if necessary)
2nd step Hz down : The frequency is forcibly lowered by 5Hz at specified intervals.
3rd step HP down : The fr
equency is forcibly lowered by 1Hz every second.
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)
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8.5
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7.4
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