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RayPac Boiler

On 10/13/2009 I posted the following on main wall.

I have a 3 unit apartment with a RayPac boiler. It requires 3 wires to open the zone. My tenants keep on crancking up the heat even though they (wires) are in boxes. Can I get a 3 wire sensor at 72 degrees that tenants can't adjust?

Does this mena there's no solution?
This discussion has been closed.