HVAC - EPA Certification Practice Exam

When should you verify the oil level of the recovery unit?

1. After refrigerant recovery

2. When the unit is not in use

3. Before using the recovery unit

4. During routine maintenance

The correct answer is: Before using the recovery unit

Verifying the oil level of the recovery unit before using it is essential for several reasons. The oil in a recovery unit helps in the lubrication of the compressor and other internal moving parts. If the oil level is too low, it can lead to increased wear and tear or even catastrophic failure of the unit when it is put to work. By checking the oil level prior to operation, a technician can ensure that the recovery unit is in optimal condition, capable of performing effectively and safely. This step ensures that, if the oil needs to be added or replaced, it can be done before any refrigerant recovery process begins, thereby preventing potential damage to the equipment and ensuring compliance with safety standards. Monitoring the oil level during routine maintenance or after refrigerant recovery is important, but it does not replace the necessity of checking it before starting up the unit for the first time or after it has been idle. Ensuring that the unit is properly set up for operation can help avoid issues that might arise during the recovery process.