At what pressure is the saturation limit defined for a very high-pressure appliance at 104°F?

The saturation limit for a very high-pressure appliance at a temperature of 104°F is indeed defined as being above 355 psia. In refrigeration and HVAC contexts, the saturation pressure corresponds to the pressure at which a refrigerant will change from liquid to vapor (or vice versa) at a specific temperature. For higher-pressure refrigerants, the saturation pressures increase significantly.

At 104°F, the typical saturation pressures for various refrigerants would generally be very high. Given that the specified range is for a very high-pressure appliance, the saturation limit would naturally be positioned significantly above common pressures.

Understanding refrigerant characteristics and their corresponding saturation pressures helps technicians safely manage systems and ensure compliance with regulations, notably those outlined by EPA standards. The other options suggest pressures that do not align with the saturation pressures for high-temperature refrigerants at that specific degree, indicating they are lower than what is required for the appliance in question.