Refrigeration System
• Normal Operating System
– Suction pressure
• Beginning freeze rapid pull down to: 20 PSIG
• End of freeze: 1 - 2 PSIG
• Harvest: increases from 30 to 55 PSIG
• Low charge
– Suction pressure
• Beginning freeze rapid pull down to: 10 PSIG
• End of freeze: slight vacuum
• Harvest – slow increase from 25 to 40 PSIG
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