If an abnormally large difference is maintained between the evaporator refrigerant temperature and the box air temperature within the refrigerated compartment, what will be the result?
• Evaporator temperature vs. box air temperature (TD – temperature difference) in a refrigeration system • How moisture in box air behaves when it contacts a very cold evaporator surface • The difference between problems caused by the evaporator side vs. the condenser/compressor side
• If the evaporator coil is much colder than the box air, what happens to the water vapor in the air when it hits that very cold surface over time? • Which of the answer choices describes a problem that would logically start on the low‑pressure/evaporator side rather than on the high‑pressure/condenser side? • Think about which option is the direct result of a big temperature difference, and which options are more secondary effects or tied to other causes (like poor condenser cooling or wrong thermostat setting).
• Identify which answers are clearly high‑side problems (condenser/head pressure) versus low‑side problems (evaporator/frosting). • Ask: would a very cold evaporator surface make the suction gas hot or cold entering the compressor? Eliminate any choice that contradicts that. • Consider normal box control: would a big evaporator/air temperature difference alone force the box temperature far below setpoint, or would the thermostat stop the machine first?
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