Question 63Refrigeration & AC - QMED

The correct answer is A) Valves 1, 2, and 3 should be in the mid-position and the low-side gauge manifold hand valve should be closed, and the high-side gauge manifold hand valve should be open. This is the correct answer because, after the refrigerant has been recovered and any leaks repaired, the system needs to undergo a dehydration evacuation prior to recharging with refrigerant. To accomplish this, the vacuum pump suction manifold isolation valve should be opened, and the valves 1, 2, and 3 should be in the mid-position to allow the vacuum pump to evacuate the system. The low-side gauge manifold hand valve should be closed to prevent air from entering the system, while the high-side gauge manifold hand valve should be open to allow the vacuum pump to draw a vacuum on the entire system. The other options are incorrect because they do not properly position the valves to achieve a full system evacuation. Options B, C, and D do not have the correct valve positions to effectively evacuate the system.