Of the various possible methods shown in the...

Question 1 of 292185eccef9dbacbc34ba4d45fcf

Of the various possible methods shown in the illustration, which is the correct method of attaching a TXV feeler bulb to a small suction line (less than 3/4") with a horizontal run? See illustration RA-0049.

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Question 1 of 29218

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🔍 Key Concepts

• TXV bulb placement on small suction lines (< 3/4") • Effect of oil and any liquid refrigerant collecting at the bottom of a horizontal suction line • Need for good contact with the suction line only, not squeezed between or touching another line

💭 Think About

• On a small, horizontal suction line, where should the bulb be placed around the circumference so it senses true suction gas temperature and not oil/liquid or external heat? • Looking at each option, which one keeps the bulb firmly on the suction line and away from being influenced by the other line running alongside? • Which illustration shows the bulb positioned so gravity won’t tend to leave oil or any liquid refrigerant directly under it?

✅ Before You Answer

• Verify which option shows the bulb mounted at or very close to the top of the suction line. • Check that in the option you choose, the bulb is in full contact with the suction line only, not trapped between the suction line and another pipe. • Confirm that the bulb is not on the bottom of the line, where oil or liquid refrigerant could collect and give a false (colder) reading.