In a direct expansion type refrigeration...

Question 1 / 270705eccef9dbacbc34ba4d45fea

Question 1 of 270705eccef9dbacbc34ba4d45fea

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?

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Question 1 of 27070

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?

🔍 Key Concepts

• Thermal expansion valve (TXV) sensing and equalizing functions • Difference between refrigerant pressure drop in the evaporator vs air pressure drop across the coil • How a TXV maintains correct superheat when inlet and outlet pressures are not the same

💭 Think About

• Ask yourself: Does an externally equalized TXV care about the air side of the coil or the refrigerant side of the system? • Think about what happens if there is a significant pressure drop between the TXV outlet and the point where superheat is actually being measured. • Which situation would cause the TXV to ‘see’ the wrong pressure if it were only internally equalized?

✅ Before You Answer

• Verify whether TXV equalizer lines connect to the refrigerant line or to the air duct. • Check which choices refer to refrigerant pressure and which refer to air pressure. • Confirm that the condition involves a significant pressure drop along the evaporator where the bulb senses temperature at the outlet.

Question 1 of 27070

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?

when the refrigerant pressure drop through the evaporator coil is less than 4 psig

when the air pressure drop across the evaporator is less than 4" of water column

when the refrigerant pressure drop through the evaporator coil exceeds 4 psig

when the air pressure drop across the evaporator exceeds 4" of water column

Question 1 / 270705eccef9dbacbc34ba4d45fea

Question 1 of 270705eccef9dbacbc34ba4d45fea

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?

Back

Question 1 of 27070

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?