Which of the following statements represents the last step to be followed when replacing the power element of the device shown in the illustration? See illustration GS-RA-07.
• Identify the device in the illustration as a thermostatic expansion valve (TXV) with a remote power element and sensing bulb. • Think about the normal installation sequence when replacing a TXV power element: mechanical mounting, bulb placement, then system tuning. • Consider what must be done after the system is back running to ensure the evaporator is neither starved nor flooded.
• When you replace the power element and remount the sensing bulb, what adjustment is necessary to confirm the valve is feeding the correct amount of refrigerant? • Which of the listed actions would normally be done only during installation, and which would be performed as a final operational check with the system online? • How does the power element and sensing bulb affect evaporator superheat, and what must be confirmed after any change to that element?
• Verify which choice deals with operational performance of the TXV rather than physical modification of parts. • Eliminate any option that would damage or permanently alter the capillary or bulb arrangement. • Focus on the step that is normally performed last, with the system running and pressures/temperatures stabilized.
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