🔍 Key Concepts
• Differences between hermetic, semi-hermetic, and open-drive refrigeration compressors
• How the electric motor is arranged relative to the compressor (inside the shell vs. outside, directly visible)
• What an external shaft coupling or drive guard looks like on a mounted compressor/motor set
💭 Think About
• Look closely at figure C: do you see a separate electric motor, or is the motor enclosed in the same housing as the compressor?
• Is there any sign of a shaft, coupling, or drive guard between the motor and compressor, or is everything sealed inside one welded shell?
• If you can see many bolts on the compressor body, what does that suggest about whether the unit is serviceable (can be opened) compared to a fully welded shell?
✅ Before You Answer
• Verify whether the motor is external and distinct from the compressor casing in figure C.
• Check if the compressor housing appears bolted and openable, or if it is a smooth, welded shell with no large split flanges.
• Match what you see with the definitions of hermetic, semi-hermetic, and open-drive drive arrangements before choosing your answer.