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I run the maintenance department at an old school building in NH. We have an old boiler that heats the building. The building has a new addition that is heated with water off the boiler and the old section with steam.

The upstairs classes in the old section have radiators, with pneumatic valves on them. There are approx. 14 radiators and four thermostat's

The problem we are having is that the heat in these rooms is very, very hot and cannot be controlled. I was told that the valves are leaking and that is the reason why it is not working, it was also suggested that I replace them with new electronic valves and thermostat's, that can be hooked up to a remote computer.

I have been a plumber for many years in Florida, but do not know much about heating, or steam...


  • Steamhead
    Steamhead Member Posts: 16,736
    Before you work on the valves

    what steam pressure are you running? If it's a two-pipe system with traps, it should be running on less than a pound. If the pressure is too high, the valves might simply not be able to react in time.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • kcopp
    kcopp Member Posts: 4,396
    where in NH?

    What pressure is the boiler running at? 2 pipe or 1 pipe steam ? What this a problem BEFORE the HW zone off the boiler was hooked up? If so it maybe a problem w/ the wiring... should be a A-stat that breaks on rise so that the boiler does not steam when the HW zone is calling... I'm in Dover. kpc
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