Honeywell Aquatrol Boiler Reset Control Panel, Used in Zoned Hydronic Systems, 4 Zone/ 2 Wire, 120 Vac, Demand Input: Heat Demand ( Thermostat R-W ), Auxiliary Demand and DHW Demand- External Dry Contacts Connection Only, Wire Clamp Screw terminals, 32-130 Degree Panel Temperature Rating, 58-230 Degree Sensor Temperature Rating, 5-90 % RH Non Condensing Operating Humidity Range