What is the main purpose of the valves shown in the illustration? See illustration GS-RA-06.
• Identify the type of refrigeration component shown by the bulb with capillary tube mounted on the valve body • Recall what variable this type of valve senses and adjusts: temperature and pressure at the evaporator outlet • Connect that sensed variable to what it actually controls in the evaporator outlet vapor
• Look closely at the sensing bulb and small tube: where in a refrigeration system is that bulb normally strapped, and what property is it reading? • Ask yourself: does this valve directly control liquid level, gas temperature, or condenser performance—and at which point in the system? • Which option best describes what happens to the refrigerant gas right after it leaves the evaporator when this valve opens or closes slightly?
• Verify which choices refer to conditions at the evaporator outlet, not in the condenser or at a solenoid valve • Make sure the function you pick involves controlling the state of the refrigerant vapor (not just liquid flow amount by itself). • Eliminate any option that talks about components not shown in the illustration (like a separate box solenoid).
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