Which component monitors refrigerant liquid level in a system?

Which component monitors refrigerant liquid level in a system?

• A. Pressure switch
• B. Capillary tube
• C. Thermostat
• D. Float switch

Answer: (D)

The device that monitors refrigerant liquid level uses a buoyant float that rises and falls with the liquid. As the level changes, the float moves a switch, signaling when the level is too high or too low. This allows the system to maintain the proper liquid level in components like the receiver or sump and to prevent both overfill and starvation of the refrigeration circuit. Pressure switches respond to pressure changes, not liquid level. A capillary tube is part of an expansion or sensing path and relates to temperature or pressure drop, not direct level monitoring. A thermostat senses temperature for control purposes, not liquid height.

The device that monitors refrigerant liquid level uses a buoyant float that rises and falls with the liquid. As the level changes, the float moves a switch, signaling when the level is too high or too low. This allows the system to maintain the proper liquid level in components like the receiver or sump and to prevent both overfill and starvation of the refrigeration circuit.

Pressure switches respond to pressure changes, not liquid level. A capillary tube is part of an expansion or sensing path and relates to temperature or pressure drop, not direct level monitoring. A thermostat senses temperature for control purposes, not liquid height.