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Reffer compressor not shut down in low pressure

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Hi when reefer running , suction pressure shows very low value 0.2 bar, but running fine, temperature is OK, refrigerant is little low….chief engineer said its OK.
Why no shut down of compressor due to low suction pressure?

  1. Close the condenser outlet valve and check its cut off or not, 2nd thing  check LP cut off setting how much it is set. if its not cut off in that limit ,mostly your pressure switch malfunctioning  or may be your pressure indicator is showing wrong reading

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