NATE Air Conditioning and Heat Pumps Practice Exam

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What potential problem is associated with the use of dye injected for the purpose of leak detection?

  1. Dye can damage a technician's refrigerant manifold gauges

  2. Dye can increase the pumping ratio of the compressor

  3. Overuse of dye can change the mixing properties of refrigerant and oil

  4. Overuse of dye can create acids in the oil

The correct answer is: Overuse of dye can change the mixing properties of refrigerant and oil

The concern with the use of dye for leak detection primarily revolves around its potential impact on the refrigerant system when used excessively. Overuse of dye can indeed alter the mixing properties of the refrigerant and the lubricant oil within the system. This alteration can lead to ineffective lubrication and cooling, as the balance between the refrigerant and oil is critical for optimal performance. When dye is introduced in excessive amounts, it can interfere with the natural properties of the refrigerant and oil, potentially causing the lubricant to become less effective, leading to increased friction and wear in the compressor. This can result in equipment damage and decreased lifespan of the HVAC system. This highlights the importance of using dye judiciously and according to recommended application guidelines to prevent adverse effects on the system's functionality.

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