Johnson Controls T-4000-2142 Plastic Cover The most common culprits are

The most common culprits are restricted airflow from a dirty air filter

Its compact snap-disc design allows for rapid response times and direct integration with Source 1 control circuits

ideal for outdoor HVAC installations

Date Code Before 9923

stretching

Johnson Controls T-4000-2142 Plastic Cover The most common culprits areThe Johnson Controls T 4000 2142 is a professional grade horizontal pneumatic thermostat cover designed specifically for the T 4000 series. This beige plastic thermostat cover facilitates precise environmental monitoring and adjustment in commercial HVAC pneumatic control systems. Engineered for horizontal mounting, it features an integrated Fahrenheit and Celsius thermometer and a single setpoint window to ensure clear visibility of system