Defrost heaters are used to

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Multiple Choice

Defrost heaters are used to

Explanation:
Defrost heaters melt the frost that builds up on the evaporator coil. When ice covers the coil, heat transfer drops and the evaporator can’t vaporize refrigerant efficiently, which slows down recovery. Heating during a defrost cycle restores the coil’s full heat-transfer area, melting the ice and allowing the refrigerant to vaporize and be recovered more quickly. That’s why defrost heaters are used to increase recovery speed and temperature. They don’t lower system pressure, replace the compressor, or deliberately create a vacuum.

Defrost heaters melt the frost that builds up on the evaporator coil. When ice covers the coil, heat transfer drops and the evaporator can’t vaporize refrigerant efficiently, which slows down recovery. Heating during a defrost cycle restores the coil’s full heat-transfer area, melting the ice and allowing the refrigerant to vaporize and be recovered more quickly. That’s why defrost heaters are used to increase recovery speed and temperature. They don’t lower system pressure, replace the compressor, or deliberately create a vacuum.

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