Both liquid and vapor refrigerant can be charged into a system by weight using an accurate charging scale. The amount of refrigerant being weighed into…
Author: matt
Refrigerant may be added to a system in either a vapor (gas) or liquid state. Both saturated vapor and liquid refrigerant exist in a refrigerant…
Purpose — Every mechanical refrigeration system that is opened for servicing must be charged before it is returned to service. Also, some models come factory…
The oil used in the vacuum pump can become contaminated. It should be changed after every 10 hours o f operation or immediately after evacuating…
The triple evacuation method is a multiple evacuation procedure based on diluting the non-condensibles and water in the system with dry nitrogen. The nitrogen is…
The deep vacuum method of dehydration relies on evacuation alone to remove moisture from the system. A deep vacuum is any vacuum o f 500…
Purpose — Evacuation removes air and moisture trapped in a refrigeration system by the use o f a vacuum pump. Air occupies space in the…