True or False: The tank inlet valve should be closed before operating a self-contained recovery machine.

• A. True
• B. False
• C. Depends on the Situation
• D. Not Important

Answer: (B)

The statement regarding the tank inlet valve should be closed before operating a self-contained recovery machine is essentially considered to be true. Closing the tank inlet valve helps to prevent any liquid refrigerant from entering the recovery machine while it operates, ensuring a safe and effective recovery process. This practice is crucial because if the valve is left open, liquid refrigerant can flood the machine, potentially damaging it and creating safety hazards.

Additionally, the proper procedure typically involves first ensuring that the recovery machine is connected correctly, confirming that all necessary valves are in the correct position (inlet and outlet), and then closing the tank inlet valve before commencing the recovery operation. This process provides a controlled environment for recovering refrigerants, adhering to environmental and safety regulations which govern refrigerant handling.

While the response might indicate uncertainty or suggest that the act of closing the tank inlet valve is situational or unimportant, proper handling and safety protocols are universally critical in refrigeration and air conditioning repairs.