Siemens 194-2083 ROOM THERMOSTAT, PNEUMATIC, DA/RA, FAHRENHEIT, DSP, H/C, 2-PIPESiemens 194 2083 Room Thermostat, Pneumatic, DA RA, Fahrenheit, DSP, H C, 2 Pipe This Powerstar Retroline Heat Cool Retrostat Pneumatic Room Thermostat Chassis is a 2 pipe, Dual Set Point, Direct Acting Heat 20 psi, Reverse Acting Cool 15 psi with a Fahrenheit scale. Replaces Johnson Controls T 4756 205, 206. Additional Information Mounting2 pipe DisplayDual Setpoint Operating rangeDay Night Measuring rangeFahrenheit