If the suction line between the evaporator...

If the suction line between the evaporator...

Question 1 of 270705eccef9ebacbc34ba4d461a3

If the suction line between the evaporator and compressor is heavily frosting up and the trouble is attributed to the thermal expansion valve, what would most likely be the cause?

Question 1 of 27070

Q

If the suction line between the evaporator and compressor is heavily frosting up and the trouble is attributed to the thermal expansion valve, what would most likely be the cause?

🔍 Key Concepts

• Thermal expansion valve (TXV) operation: how bulb temperature affects valve opening • Relationship between refrigerant flow, superheat, and frosting of the suction line • What conditions inside the TXV (too much vs. too little refrigerant flow) will cause liquid refrigerant to reach the compressor suction line

💭 Think About

• Which problem with the TXV or its sensing bulb would cause the valve to overfeed refrigerant instead of starving the evaporator? • If the suction line is heavily frosted, does that suggest too much liquid refrigerant leaving the evaporator, or not enough? • For each option, ask: does this condition tend to make the valve stay more open or more closed, and what effect would that have on suction line temperature?

✅ Before You Answer

• For each answer choice, decide whether it would cause overfeeding (low superheat, possible flooding and frosting) or underfeeding (high superheat, warm suction line) • Think about where the sensing bulb must be and how it must be attached to correctly sense suction line temperature • Consider whether loss of power element charge or a stuck-closed needle would more likely cause starvation (warm suction, no frost) rather than heavy frosting