During normal defrost, the compressor is:

During normal defrost, the compressor is:

• A. Running
• B. Off
• C. In reverse
• D. In high load

Answer: (B)

During normal defrost, the goal is to melt the frost on the evaporator without continuing the cooling cycle. To achieve this, the refrigeration cycle is paused and the compressor is shut off. With the compressor off, heat from the defrost heater can warm the evaporator coils, melt the frost, and allow the water to drain away. If the compressor kept running, the evaporator would stay cold and resist defrost, making the cycle ineffective and wasting energy. After defrost finishes and the coil returns to the proper temperature, the control restarts the compressor to resume cooling.

During normal defrost, the goal is to melt the frost on the evaporator without continuing the cooling cycle. To achieve this, the refrigeration cycle is paused and the compressor is shut off. With the compressor off, heat from the defrost heater can warm the evaporator coils, melt the frost, and allow the water to drain away. If the compressor kept running, the evaporator would stay cold and resist defrost, making the cycle ineffective and wasting energy. After defrost finishes and the coil returns to the proper temperature, the control restarts the compressor to resume cooling.