Expansion Tank - Navien NCB-24LSWE Service Manual

4.9.18 Expansion tank

Item
Function
Version 1.0
1. Removes air from the system during heating.
2. Relieves system pressure caused by expansion as the water temperature increases.
3. Uses a built-in low level water sensor to maintain the water in the boiler at a consistent
volume.
Description
NCB Service Manual 77