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Refrigeration & Air Conditioning Mechanic Red Seal · Question

In a direct expansion (DX) evaporator, where should the TXV sensing bulb be securely attached?

The TXV sensing bulb should be clamped securely to the suction line after the evaporator to accurately measure the superheat.

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Question: In a direct expansion (DX) evaporator, where should the TXV sensing bulb be securely attached?

Answer options: ✅ On the suction line, just after the evaporator outlet

  • On the liquid line, before the expansion valve
  • On the discharge line, near the compressor
  • Inside the evaporator coil

Correct answer: On the suction line, just after the evaporator outlet

Explanation: The TXV sensing bulb should be clamped securely to the suction line after the evaporator to accurately measure the superheat.

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