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Is there ever a reason to maintain higher water level than NWL in spec book??
Looking at 2 Independence SIN8LNS-LE2 boilers connected in tandem/parallel.
Installed in 2002. Installer was very competent and would follow instructions and piping diagrams.
There were no piping diagrams for tandem connections included with the boilers.
He had to depend upon supplier/factory advice.
Each boiler piped with both 2" risers into 3" header with 2" equalizer.
Each has 3" supply main riser drop headed into 6" header which has two 3" steam mains connected.
6" header has drip with F&T going to dry return. All connections are in the approved arrangement/order by the book.
One feeder pump for both boilers.
Each boiler has M&M 150S-MHD LWCO/ pump feeder control.
Solenoid valve for each boiler water fill from pump.
Each boiler has probe type secondary LWCO.
However........the pump feeders are mounted with the casting line at the level of the recommended Normal Water level.
This is 2" higher than recommended by M&M, boilers are constantly over filled.
Installer was told by supplier/factory reps to install them at that height.
Any idea why??
The system runs at less than 1 PSI. The same reps said he needed to raise the pressure by installing King valves on all 4 boiler risers and throttle them down. Anyone ever heard of this??
It has been heating the building and is in need of basic servicing now.
I believe lower the feeder controls would improve the steam delivery.
There is very little steam chest with this water level.