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Burnham IN5 Steam Boiler Runs With An Empty Gauge Glass
I recently had a gas conversion to a Burnham IN5 steam boiler (358 sq. ft. steam). It replaced an oil fired Weil-Mclain 368 steam boiler (355 sq. ft.steam).
The boiler was installed with a single Supply Riser out of the boiler (second Supply Port is plugged).
The boiler has a water auto-feed with a probe type low water cut off. The Pressuretrol setting is 3.0 psi Main / 1.4 psi DIFF.
I want to know if the piping above the boiler should be reworked with a second Supply Riser out of the boiler?
I have a Single Pipe System with 8 old style radiators. The system was flushed, and a new main line vent and new radiator vents were installed. The pitch of the main line was checked, and a new digital Honeywell thermostat was installed and programmed to steam.
Every time the thermostat calls for heat the boiler has two (2) run times, it goes on for a few minutes and then turns off because the water in the Gauge Glass drops below the low water cut off point. The boiler stays off for a few minutes until the water level rises by way of the wet return or auto-feed. The boiler will then turn on again and stay on for as long as the thermostat calls for heat. During the first run time I can hear water being pushed through the main line with occasional knocking. The second run time is usually quiet.
Is it possible that having only a single Supply Riser is creating the problem? Is the water being pushed to the single Supply Riser (opposite side away from Gauge Glass) creating an angled water level in the boiler which empties the Gauge Glass each time.
Also is the Pressuretrol setting of 3.0 psi Main / 1.4 psi DIFF to high?
Are they both the problem?
I would appreciate any advice.