MACS 609 Certification Practice Exam

Which of the following statements is NOT true about newer mobile A/C systems?

1. It’s good practice to "Top Off" new A/C systems

2. They require less refrigerant than older models

3. They utilize more environmentally friendly refrigerants

4. They have improved energy efficiency

The correct answer is: It’s good practice to "Top Off" new A/C systems

Newer mobile A/C systems are designed with specific refrigerant capacities in mind, and "topping off" refrigerant can lead to overcharging. Overcharging can create high pressures in the A/C system resulting in inefficiencies, potential leaks, and even damage to components. Unlike older systems, which may have tolerated refrigerant levels being adjusted without immediate consequences, current designs are more sensitive to these parameters. It is crucial to maintain the specified amount of refrigerant for optimal operation and performance. In contrast, newer A/C systems indeed require less refrigerant compared to older models due to advancements in technology and design efficiency. They also typically utilize more environmentally friendly refrigerants, aligned with global efforts to reduce ozone depletion and greenhouse gas emissions. Additionally, improvements in energy efficiency have been made in newer A/C models, allowing them to provide better cooling performance while consuming less energy. These advancements constitute significant benefits that enhance the environmental impact and operating cost of mobile A/C systems.