coal steam

Mike Kuntz

I work for a heating company in Pa. I am trying to put a coal steam boiler back in service. The problem that I am having is with the draft control. It was a diafram unit that worked off of steam pressure. I took it apart and he gasket is shot. It has been suggested that I use an electric motor control and a aquastat. I am wondering if this is a good idea and if so what kind of aquastat to use. If you can give any advice I would appreciate it.

Steamhead

Controlling Coal Steam

I think you're on the right track. The Aquastat would be used to keep the fire from going out by maintaining a minimum boiler temperature. It would be connected in parallel with the room thermostat. I'm not sure what minimum temp to use but 120 degrees sounds like a place to start. Use whatever Aquastat can be mounted below the boiler's water line.

For your high limit, use a Pressuretrol on a one-pipe system or a Vaporstat on a Vapor system. And wire your low-water cutoff so it will cause the damper motor to close the inlet damper immediately if the level drops too low.

And post some pics!

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