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When dealing with a unit that has tripped on high-limit or failed to initiate heating
critical for preventing heat exchanger fatigue and over-firing
What is the difference between this and the ICM200F
This OEM Honeywell part functions by providing the necessary compression and alignment for the packing cartridges
Always verify the model number on your furnace's rating plate
Johnson Controls T-4000-2139 Cover When dealing with a unitThe Johnson Controls T 4000 2139 is a professional grade horizontal thermostat cover designed specifically for the T 4000 Series pneumatic room thermostats. Engineered for sleek, unobtrusive installation, this beige plastic cover features a clean aluminum faceplate without a thermometer window or setpoint adjustment openings. This configuration is ideal for facilities where unauthorized tampering must be minimized while maintaining a uniform aesthetic