When charging refrigerant blends, you should charge them as a liquid.

When charging refrigerant blends, you should charge them as a liquid.

• A. True
• B. False
• C. Only for some blends
• D. It doesn't matter

Answer: (A)

When a refrigerant blend is charged, the different components don’t all behave the same way because they have different boiling points. If you introduce the blend as a vapor, the lighter components tend to vaporize first, which shifts the mixture inside the system away from the intended ratio. That change, called fractionation, can affect pressures, cooling performance, and lubrication. Charging as a liquid delivers the mixture in its designed composition, helping prevent that separation and keeping the system operating as intended. This is the standard practice for most blends, though some azeotropic or near-azeotropic blends behave more like a single substance.

When a refrigerant blend is charged, the different components don’t all behave the same way because they have different boiling points. If you introduce the blend as a vapor, the lighter components tend to vaporize first, which shifts the mixture inside the system away from the intended ratio. That change, called fractionation, can affect pressures, cooling performance, and lubrication. Charging as a liquid delivers the mixture in its designed composition, helping prevent that separation and keeping the system operating as intended. This is the standard practice for most blends, though some azeotropic or near-azeotropic blends behave more like a single substance.