When preparing to transfer recycled refrigerant into an empty storage cylinder, it is crucial to ensure the cylinder is appropriately prepared to safely store the refrigerant. The correct step in preparation involves ensuring the storage cylinder is free from any contaminants, such as air or moisture, which could affect the integrity and performance of the refrigerant.
Let's analyze the options:
Option A: Washed with strong detergent
Washing the storage cylinder with a strong detergent is not a standard practice, as this could leave residues inside the cylinder that might contaminate the refrigerant.
Option B: Stored in direct sunlight to dry
Exposing the cylinder to direct sunlight for drying purposes is not an effective or recommended method. Sunlight does not guarantee the complete removal of contaminants or ensure the proper readiness of the cylinder for refrigerant storage.
Option C: Measured with a thermometer
Using a thermometer to measure something in the cylinder does not prepare it for the transfer of refrigerant. This step does not address the removal of contaminants necessary for safe refrigerant storage.
Option D: Evacuated to at least 27" hg
Evacuating the cylinder to at least 27 inches of mercury (27" hg) is the correct procedure. This vacuum process ensures that any remaining air or moisture inside the cylinder is effectively removed, creating a safe environment for the storage of the refrigerant. Air and moisture in the cylinder could lead to chemical reactions with the refrigerant, causing potential damage or reduced efficiency.
Therefore, the correct course of action before transferring recycled refrigerant into an empty storage cylinder is to:
D: Evacuate the cylinder to at least 27" hg.
