🔍 Key Concepts

• Low pressure cutout switch function in a refrigeration system • How refrigerant charge level and evaporator feed/flow restrictions affect suction pressure • Typical symptoms of short cycling (frequent start/stop) of a compressor

💭 Think About

• When the low pressure cutout is cycling rapidly, what is happening to the suction pressure just before each start and stop? • Which listed condition would cause the suction pressure to repeatedly drop below the cutout setting, then recover, over and over? • For each choice, ask: does this problem mainly affect high-side pressure, low-side pressure, or both, and would it be steady or fluctuating?

✅ Before You Answer

• Identify which options would mainly raise high-side pressure rather than lower suction pressure—those are less likely. • Consider which option would create a restriction or starvation of refrigerant to the evaporator, causing suction pressure to fall off and then slowly build back up. • Check which fault would usually give a more constant abnormal pressure (not cycling), instead of the on/off short-cycling pattern.