What happens if an MVAC system is overcharged with refrigerant?

Overcharging an MVAC system with refrigerant can lead to increased pressure within the system. Refrigerants are designed to operate within specific pressure ranges, and exceeding these can cause various issues, including compressor failure, ice formation on the evaporator coil, and even leaks in system components. The system is not only more likely to break down but may also experience reduced cooling efficiency and higher energy consumption due to the added strain on the components.

In contrast, the other choices suggest positive outcomes or misconceptions related to overcharging. For example, overcharging would not increase efficiency or performance; instead, it disrupts optimal conditions. Additionally, moisture build-up is not prevented; proper refrigerant levels are crucial for proper moisture management. Finally, refrigerants that are overcharged do not become less effective in a conventional sense, but their performance is severely impacted due to the increased pressure. Thus, overcharging primarily leads to increased pressure and potential system failure, making it vital to maintain correct refrigerant levels for the safe and efficient operation of MVAC systems.