Johnson Controls T-3100-3 Thermostat 30067439-890 It also works for gravity-vented

It also works for gravity-vented Models F and B when a power venter is installed

Using it with a counter-clockwise motor will result in significantly reduced airflow and potential motor overheating due to the blade orientation

maintaining stable electrical properties even under extreme cycling conditions

Enhanced System Matching: Direct replacement for the Maxitrol TD107A

Johnson Controls T-3100-3 Thermostat 30067439-890 It also works for gravity-ventedThe Johnson Controls T 3100 3 is a precision engineered pneumatic thermostat designed for non relay type proportional control in commercial HVAC systems. This reverse acting controller utilizes a liquid filled sensing element and a 42 inch capillary tube, making it ideal for remote bulb thermostat applications where internal cabinet sensing is required. Operating with a 60 to 150 degree Fahrenheit range and a 25 psig maximum supply pressure, this unit