Refrigeration and Air Conditioning Mechanics (313A) Advanced Practice Exam

Question: 1 / 415

The low side float is controlled by which factor?

The temperature of the evaporator

The rate of refrigerant evaporating

The low side float is directly influenced by the rate of refrigerant evaporating in the evaporator. As refrigerant flows into the evaporator, it absorbs heat and changes from liquid to vapor. The rate of evaporation determines how much refrigerant is present in the evaporator and subsequently how the float operates.

When the rate of evaporation is high, it allows more refrigerant to vaporize, which can lead to the float dropping and allowing more liquid refrigerant into the evaporator. Conversely, if the evaporation rate is low, the float will rise, restricting the flow of liquid refrigerant and thus maintaining a balanced level. This mechanism ensures that the evaporator operates efficiently by preventing it from flooding or running dry, which can adversely affect system performance and efficiency.

Other factors like temperature of the evaporator, pressure in the suction line, or ambient temperature influence system behavior but do not directly control the float's position in relation to the refrigerant's evaporation rate.

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Pressure in the suction line

The ambient temperature

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