Final answer:
Flare connections are commonly used in mini-split systems to ensure a tight seal for refrigerant lines, not to prevent oxidation in the lines or protect electronic expansion valves from heat, making the statement false.
Step-by-step explanation:
The statement that flare connections are used on mini-split systems to avoid oxidation in the lines and also to avoid heating and destroying the sensitive electronic expansion valves used in the outdoor units is false. Flare connections are indeed a common method used to connect refrigerant lines in mini-split systems, but their main purpose is to ensure a tight and leak-free seal. They do not prevent oxidation or protect electronic expansion valves from heat.
Furthermore, when installing a mini-split system, flare fittings are used because they do not require soldering, which is beneficial because soldering can introduce heat that could potentially damage the electronic components in the system, including the expansion valves. However, the primary concern with soldering is not generally oxidation but rather the possibility of heat damage.