Required Level of Evacuation of Appliances
This table lists levels of evacuation for various types of refrigeration and air conditioning equipment manufactured either before or after November 15, 1993.
| Type of Appliance | Inches of Hg vacuum (relative to standard atmospheric pressure of 29.9 inches Hg) |
|
|---|---|---|
| Using pre-1993 equipment | Using post-1993 equipment | |
| Very high-pressure appliance | 0 | 0 |
| High-pressure appliance, or isolated component of such appliance, with a full charge of less than 200 pounds of refrigerant | 0 | 0 |
| High-pressure appliance, or isolated component of such appliance, with a full charge of 200 pounds or more of refrigerant | 4 | 10 |
| Medium-pressure appliance, or isolated component of such appliance, with a full charge of less than 200 pounds of refrigerant | 4 | 10 |
| Medium-pressure appliance, or isolated component of such appliance, with a full charge of 200 pounds or more of refrigerant | 4 | 10 |
| Low-pressure appliance | 25 mm Hg absolute | 25 mm Hg absolute |