Johnson Controls T-4100-2 Thermostat 30067439-890 if the ignitor glows but

if the ignitor glows but the main burner does not light

ensuring full compatibility with existing wiring harnesses without field modifications

minimizing hysteresis and ensuring reliable proportional control in steam or water applications

It is rigorously tested for compatibility with Weil McLain boiler models including the AHE

this instrument provides high visibility for technicians monitoring pneumatic pressure signals

Johnson Controls T-4100-2 Thermostat 30067439-890 if the ignitor glows butThe Johnson Controls T 4100 2 is a professional grade pneumatic thermostat designed for precision control in low volume output applications. This reverse acting pneumatic controller utilizes a force balance mechanism to modulate branch pressure in response to temperature fluctuations, ensuring stable HVAC performance. Engineered for vertical mount installations, the T 4100 2 features a 55 to 85 degree Fahrenheit dial range and is optimized for systems