Honeywell 135 Ohm, Proportional Thermostat, 10 C to 30 C, 3-Wire, Low-Voltage

T921 Thermostats provide 3-wire, low voltageproportional control for Series 90 (135 ohm) valvemotors, damper motors, and balancing relays inheating or cooling system applications. Product Features Bellows element adjusts potentiometer slider to regulate motor operation. Removable setting knob prevents unauthorized tampering with setpoint. Product Specifications Output Signal: 135 Ohm potentiometer Setpoint Temperature Range (C): 13 C to 29 C Mounting: Wall mount Throttling Range: 1.4 C Dimensions: 5 11/16 in. high x 3 3/8 in. wide x 2 1/4 in. deep