A low-pressure appliance utilizes a refrigerant with what saturation pressure below at 104°F?

A low-pressure appliance, such as a chiller or refrigerator operating with certain types of refrigerants, operates at a saturation pressure that is significantly lower than the pressures associated with high-pressure or medium-pressure systems.

At 104°F, the saturation pressure of the refrigerant is critical for determining the proper function of the appliance. In this context, the correct choice of 45 psia aligns with the characteristics of low-pressure refrigerants, which typically operate under substantial vacuum conditions, ensuring efficiency and safety.

Refrigerants like R-11 and R-133a, commonly used in low-pressure systems, have saturation pressures that are below 45 psia at various temperatures. This keeps the system's operation within the necessary parameters to avoid compromising efficiency or introducing risks associated with higher pressures.

Understanding the saturation pressure is essential for technicians to ensure proper refrigerant charge and prevent potential system malfunctions. Knowing that low-pressure appliances generally correspond to lower saturation pressures helps technicians in diagnosing issues and making informed decisions when servicing or handling these systems.