In the triple evacuation method, the system is evacuated initially to a vacuum of at least how many microns?

In the triple evacuation method, the system must be evacuated to a vacuum of at least 500 to 2,000 microns. This level of evacuation is crucial for effectively removing moisture and non-condensables from the system before it is charged with refrigerant. Evacuating the system to this level reduces the risk of refrigerant degradation and ensures optimal heat transfer within the system, which is vital for efficient operation.

Pursuing a vacuum below 500 microns is possible and can be beneficial for complete moisture removal, but the key requirement in the context of the triple evacuation method serves as a guideline to safely secure the system for the charging process. The choice of the specified range of 500 to 2,000 microns aligns with industry practices to provide a robust balance between thorough evacuation and practical limitations of the equipment typically employed in the field.