What type and amount of refrigerant is used as the factory charge for the specified unit?

The factory charge for a specified unit of refrigeration equipment is crucial for its efficient operation. In this case, option B specifies R404A as the refrigerant used, along with a charge of 13 lbs.

R404A is a commonly used refrigerant in commercial refrigeration systems, particularly in applications requiring low-temperature cooling. It has a global warming potential that has prompted scrutiny and a shift towards more environmentally friendly alternatives, but it remains a standard in many existing systems. The specified charge of 13 lbs is designed to match the system's requirements for optimal performance and efficiency. Proper refrigerant charge ensures that the system operates within intended parameters, avoiding issues such as inadequate cooling or excessive energy consumption.

The combination of R404A and the specified amount reflects a standard factory configuration for units designed for particular cooling capacities and load conditions, ensuring reliability and performance from the outset.

This attention to charged volume is vital, as an incorrect amount of refrigerant can lead to operational inefficiencies, increased wear on components, and potential system failure. Therefore, the accuracy in specifying both the type and the amount of refrigerant is essential for successful operation.