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High-Temperature Protection: Triggers a shut-down at 240°F to prevent heat exchanger overheating
The Johnson Controls T-4000-2141 is a commercial-grade beige plastic thermostat cover designed specifically for horizontally mounted pneumatic thermostats
ensuring reliable switching transitions without the need for immediate field adjustment
if the motor is humming but not starting
This specific model does not typically include an onboard reset button or fuse
Schneider Electric (Barber Colman) AT-520-40 Knob Kit High-Temperature Protection: Triggers a shut-downThe Schneider Electric (Barber Colman) AT 520 40 Knob Kit is a critical replacement component for field technicians managing pneumatic control systems and legacy HVAC automation hardware. This setpoint knob kit is specifically engineered to provide a precision fit for Barber Colman TK Series thermostats, ensuring accurate calibration and tactile adjustment of space temperature setpoints. Built from high impact, industrial grade plastic, the AT 520 40
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