🔍 Key Concepts

• Refrigeration cycle basics – what causes liquid refrigerant to return (flood back) to the compressor suction line • Evaporator performance and defrosting – how frost on the evaporator coil affects heat transfer and refrigerant evaporation • Compressor protection – why liquid refrigerant at the compressor suction is dangerous and how system conditions can be adjusted to prevent it

💭 Think About

• If liquid refrigerant is reaching the compressor, what does that tell you about how completely the refrigerant is boiling off in the evaporator? • Which action directly addresses the condition inside the evaporator itself versus changing the overall charge or other components? • What maintenance condition could cause poor heat transfer in the evaporator, leading to very low suction temperatures and heavy frosting?

✅ Before You Answer

• Before choosing, ask: does this option directly help the refrigerant finish evaporating before it reaches the compressor? • Verify which choice treats the root cause at the evaporator rather than just changing the amount of refrigerant in the system. • Eliminate any option that doesn’t clearly relate to correcting floodback from the evaporator (not oil level, not non‑condensables).