Coil Hook-Up Kit Leaking? Here’s How to Troubleshoot It

Coil piping packages are an excellent way to save money and time by purchasing all the components required for a balanced system in one package.  However, coil hook-up kits are particularly prone to leaks and proper installation and testing is essential for maintaining the system in balance and completely sealed.

Today’s coil hookup kits and coil piping systems generally go through rigorous testing by the manufacturer, but observation and careful installation at the site are also important for keeping the system running properly.  The best time to configure your closed system for leaks is as you are installing the coil hook-up kit, before you add refrigerant (or whichever liquid will be used).

1. After installing the coil according to the manufacturer’s specifications, pressurize the coil to 100 psig.  Use a gas, such as dry nitrogen, to avoid leaks and mess in case there is indeed a leak present.
2. Watch the pressure for 10 minutes.  If no drop in pressure occurs, the system likely does not have any leaks.  If it drops – but only by 5 psi or less – this could indicate a small leak; re-pressurize and wait another few minutes.
3. If the pressure falls by over 5 psi, there is probably a significant leak in the system.  Check the valves, fittings, and openings in the system for splits, holes, and loose connections.  If there is an actual leak in the coil, it will need to be replaced by the manufacturer.