Any time you connect a new WAV the Apex will recognize it as a new Module and assign it the next available AquaBus address. For your situation follow these steps:
1. Click the padlock icon to unlock the dashboard.
2. Scroll through the list of Unused Tiles at the top of the screen to find the new WAV.
3. Click and drag the new WAV output to your dashboard, then click the padlock again to lock the dashboard.
4. Click the gear next to the new WAV output.
5. On the configuration screen click the Copy icon at the top.
6. Select your old WAV to copy its programming.
7. Click the Save icon at the top right.
8. Verify your programming looks correct.
9. Go into your list of Modules to delete the old WAV.