When a refrigeration compressor is in the...

Question 1 / 205eccef9dbacbc34ba4d45fba

Question 1 of 205eccef9dbacbc34ba4d45fba

When a refrigeration compressor is in the 'off' cycle, how will the thermal expansion valve respond?

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Question 1 of 20

5eccef9dbacbc34ba4d45fba

When a refrigeration compressor is in the 'off' cycle, how will the thermal expansion valve respond?

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🔍 Key Concepts

• Thermal expansion valve (TXV) operation during normal running vs. when refrigerant flow stops • Relationship between compressor running, evaporator pressure, and TXV bulb/sensing temperature • Difference between systems with evaporator pump‑down (low pressure control) and systems controlled only by a space thermostat

💭 Think About

• Think about what provides the force that keeps a TXV open or closed. What happens to that driving force when the compressor stops and suction pressure starts to change? • In a pump‑down system, what does the low‑pressure cutout actually do to the evaporator pressure before the compressor turns off, and how would that affect the TXV position? • In a system with only a thermostat (no pump‑down), what happens to evaporator pressure and superheat when the compressor shuts off but liquid refrigerant is still present at the TXV inlet?

✅ Before You Answer

• For each choice, ask: Is there still pressure/temperature difference across the TXV that would keep it significantly open? • Check whether pump‑down means the evaporator is mostly emptied of liquid refrigerant before shut‑off, and how that influences the TXV • Decide whether a TXV can truly "keep controlling superheat" when there is little or no refrigerant flow through the evaporator.

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Question 1 of 20

When a refrigeration compressor is in the 'off' cycle, how will the thermal expansion valve respond?

it will remain open if the compressor is controlled by a low pressure cutout and evaporator pump down is featured

it will attempt to control superheat as if the system was still in operation

it will close if the compressor is controlled by a thermostat and evaporator pump down is not featured

all the above

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Question 1 / 205eccef9dbacbc34ba4d45fba

Question 1 of 205eccef9dbacbc34ba4d45fba

When a refrigeration compressor is in the 'off' cycle, how will the thermal expansion valve respond?

Back

Question 1 of 20

5eccef9dbacbc34ba4d45fba

When a refrigeration compressor is in the 'off' cycle, how will the thermal expansion valve respond?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed