HALCW flow sensors replacement job is done. All ITE/ITW(except ITE HS) return line water flow sensors including paddle wheels and coils are replaced.  After job, water interlock signal have been checked in electrical room .  Everything works fine. Visually inspections for possible water leak on HCLCW system have been done as well. one valve on ITE dump return line has a very small water seeping through valve stem. I will watch on it.  Other than that,  No major concern.

2023-03-08: leak on 1/2" ITE dump return line valve is fixed.