Air entering a system contains moisture. Moisture in the refrigerant can create oil sludge, which reduces the lubrication properties of the oil and plugs oil…

Purpose — Refrigeration systems are intended to contain only refrigerant and oil. Anything else in the closed system is considered a contaminant. Contaminants such as…

Most refrigerants such as HCFC-22 are made from a single pure chemical compound. Others are made by mixing (blending) two or more different refrigerants. Refrigerant…

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…