NATE Heat Pump Service Practice Questions - NATE Air-to-Air Heat Pump Service Specialty Exam

During a normal defrost cycle on an air-to-air heat pump, what three things typically occur?

Reversing valve shifts to cooling, outdoor fan stops, auxiliary heat energizes Outdoor fan speeds up, indoor fan stops, compressor stops Compressor stops, reversing valve shifts to heating, aux heat off Reversing valve stays in heating, outdoor fan runs, defrost timer resets

Correct Answer:

Reversing valve shifts to cooling, outdoor fan stops, auxiliary heat energizes

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