Which refrigerants are commonly associated with low-pressure appliances?

The choice of R-11, R-123, and R-113 as commonly associated refrigerants with low-pressure appliances is correct due to their operational characteristics and applications. These refrigerants typically have a significant vapor pressure at room temperature, which means they operate at lower pressures than many other refrigerants.

R-11, also known as Trichlorofluoromethane, is widely used in low-pressure chillers, as it provides excellent thermodynamic properties and efficiency in vapor-compression cycles at lower pressures. R-123, which is often used in chiller applications, operates effectively in low-pressure systems and is favored for its lower ozone depletion potential compared to other chlorofluorocarbons. R-113, another low-pressure refrigerant, has historically been used in various refrigeration and air conditioning applications, often serving as a solvent as well.

Considering the other refrigerants listed, they are either not as commonly associated with low-pressure systems or have characteristics that place them in different pressure categories. For instance, R-134A and R-22 are predominantly used in medium to high-pressure applications. R-401A and R-500 are blends that may not be as widely recognized for low-pressure use compared to R-11,