Herman Nelson Immured Wall type radiator

Jon_17

Does anyone have drawings/specs showing where the valves and traps are located in the basement area for the invisible "Immured" Herman Nelson residential wall radiators?

Steamhead (in transit)

Somewhere

between the risers and the mains. It's really the installer's discretion. I think the bottom grille could be removed on these units though; check in there for the valves and traps if you haven't already.

If you find there aren't any traps or other devices on the return connections at all, it's an Orifice system.

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