🔍 Key Concepts

• Multi-box refrigeration system layout and how each box temperature is controlled • Function of a thermostatically controlled solenoid valve in a refrigerant liquid line • Difference between superheat control and box temperature control

💭 Think About

• Think about what the thermostat inside each refrigerated compartment is actually sensing and what it can directly control in the piping system. • Ask yourself: does this solenoid valve act on the compressor, the expansion/superheat setting, or simply the flow of refrigerant to a specific box? • Which component in a typical system is normally responsible for maintaining superheat, and is that the same as a thermostatic solenoid?

✅ Before You Answer

• Identify which choice describes a function that a solenoid valve (on/off valve) can realistically perform. • Separate the job of controlling box air temperature from the job of regulating refrigerant superheat at the evaporator outlet. • Verify which component normally stops/starts the compressor in a multi-box system versus which component just opens/closes refrigerant flow to an individual box.