When installing copper tubing refrigerant lines, what must be used to avoid collapsing at bends?

Using a lever type tubing bender is essential when installing copper tubing refrigerant lines to prevent collapsing at bends. This tool is specifically designed to create smooth, precise bends in copper tubing without deforming the material. When bends are made without the proper tool, the copper can easily collapse or kink, leading to potential leaks and compromised functionality in the refrigerant system.

The lever type tubing bender ensures that the radius of the bend is appropriate and that the integrity of the tubing is maintained throughout the installation process. This is critical because any flaws in the tubing can lead to inefficiencies or failures in a refrigeration system.

Other options, while useful for different tasks, do not provide the same benefit. A standard pipe cutter is meant for cutting tubing and won't help in making bends. A flexible pipe tool is not specifically designed for bending and might not ensure the necessary smooth curves required. A soldering iron is used for joining copper tubing but is not applicable in making bends and could not prevent collapsing at those bends.