The process for installing expansion fittings involves using a specialized expansion tool to enlarge the tubing end, inserting the fitting, and allowing the tubing to shrink back to create a secure connection. The exact number of expansions will depend on the tubing size.
While the reference video clip is brief, here's a general overview of the PEX-a expansion fitting installation process, incorporating best practices:
Steps for Installing PEX-a Expansion Fittings:
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Cut the Tubing Squarely: Use a PEX tubing cutter to ensure a clean, square cut on the PEX-a tubing. This is crucial for a proper seal.
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Select the Correct Fitting: Choose the appropriate expansion fitting for your application and tubing size. Ensure it's compatible with PEX-a tubing.
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Choose the Correct Expansion Head: Select the appropriate expansion head for your PEX-a tubing size. This is key to ensuring a correct expansion.
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Expand the Tubing:
- Insert the expansion head onto the expansion tool.
- Place the expansion head over the end of the PEX-a tubing.
- Operate the expansion tool according to the manufacturer's instructions. The reference notes that the expander head should rotate after each expansion to prevent ridges on the inside of the tubing.
- Expand the tubing the required number of times for the size. The necessary number of expansions is dictated by the tubing size.
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Insert the Fitting: Immediately after expanding the tubing (before it starts to shrink back), insert the expansion fitting fully into the expanded end of the tubing.
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Allow the Tubing to Shrink: Let the PEX-a tubing shrink back down around the fitting. This creates a very strong, reliable connection. Do not use heat or other methods to accelerate this process. It's best to let it happen naturally.
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Inspect the Connection: After the tubing has shrunk, visually inspect the connection to ensure it's secure and properly seated. The tubing should tightly grip the fitting.
Important Considerations:
- PEX-a Tubing: Expansion fittings are specifically designed for use with PEX-a tubing. They are generally not compatible with other types of PEX (PEX-b or PEX-c).
- Expansion Tool: You'll need a PEX expansion tool. These tools come in various types, including manual and powered versions. Choose one appropriate for your needs and budget.
- Manufacturer's Instructions: Always follow the specific instructions provided by the manufacturer of both the PEX tubing and the expansion fittings.
- Temperature: Installation is easier when the tubing is warmer, as it's more flexible. In cold weather, you might need to warm the tubing slightly before expanding it.
