Charging charts are sometimes used to charge the system. These charts are usually attached to the unit or included in the manufacturer’s service instructions. Use…

Many certified recovery/recycle units have the capability to recharge recovered refrigerant, in the liquid or vapor state, into a system. When charging with such a…

The thermostatic expansion valve (TXV) maintains a constant superheat over a wide range of load conditions. Because of this, charging using the superheat method cannot…

Superheat is the heat added to refrigerant after all the refrigerant has changed to a vapor. By knowing the amount of superheat in the system…

Charging by weight is used if a complete charge is to be added to the system and the weight of the charge is known. Liquid…

Charging by weight is used if a complete charge is to be added to the system and the weight of the charge is known. To…

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…

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…