Copper-plating of compressor parts is:

Copper-plating of compressor parts is:

• A. Done at the factory to prevent rusting.
• B. Caused by contaminants in the system.
• C. Unlikely to happen unless the motor has a ground.
• D. Prevented by adding methanol to the system.

Answer: (B)

Copper-plating of compressor parts happens when contaminants enter the refrigerant and lubrication path. Copper or copper ions in the oil or refrigerant can be carried through the system and deposit on internal surfaces, forming a copper coating. This is a sign of contamination, not a deliberate or normal condition, and it can impair lubrication and heat transfer, indicating the system needs cleaning and assessment for sources of copper debris. It isn’t caused by grounding or prevented by adding methanol, and it isn’t a factory coating meant to prevent rust.

Copper-plating of compressor parts happens when contaminants enter the refrigerant and lubrication path. Copper or copper ions in the oil or refrigerant can be carried through the system and deposit on internal surfaces, forming a copper coating. This is a sign of contamination, not a deliberate or normal condition, and it can impair lubrication and heat transfer, indicating the system needs cleaning and assessment for sources of copper debris. It isn’t caused by grounding or prevented by adding methanol, and it isn’t a factory coating meant to prevent rust.