Johnson Controls AS-VAV111: A Comprehensive Guide to Understanding and Troubleshooting the AS-VAV111 Air-Side VAV System

The Johnson Controls AS-VAV111 is a popular air-side variable air volume (VAV) system designed to provide efficient and reliable heating and cooling solutions for various applications. As a widely used system, it's essential to understand its operation, troubleshooting, and maintenance to ensure optimal performance and extend its lifespan. In this article, we'll delve into the details of the AS-VAV111 system, covering its components, operation, and troubleshooting tips.

Components of the AS-VAV111 System

The AS-VAV111 system consists of the following key components:

1. Air Handling Unit (AHU): The AHU is the central unit that houses the fan, coils, and other components. It's responsible for circulating and conditioning the air.

2. VAV Terminal Units: These units are installed in each zone and are responsible for controlling the airflow and temperature. They consist of a damper, actuator, and sensors.

3. Sensors: The system uses various sensors to monitor temperature, humidity, and pressure. These sensors provide data to the controller, which adjusts the airflow and temperature accordingly.

4. Controller: The controller is the brain of the system, receiving data from the sensors and sending signals to the VAV terminal units and AHU to adjust the airflow and temperature.

5. Actuators: The actuators are responsible for opening and closing the dampers in the VAV terminal units.

Operation of the AS-VAV111 System

The AS-VAV111 system operates as follows:

1. The AHU circulates and conditions the air, which is then distributed to the VAV terminal units.

2. The VAV terminal units receive the air and adjust the airflow and temperature based on the sensor data and controller instructions.

3. The sensors monitor the temperature, humidity, and pressure in each zone and send data to the controller.

4. The controller adjusts the airflow and temperature in each zone to maintain the desired setpoint.

5. The actuator opens and closes the dampers in the VAV terminal units to achieve the desired airflow and temperature.

Troubleshooting the AS-VAV111 System

Common issues with the AS-VAV111 system include:

1. Airflow issues: Insufficient or excessive airflow can cause temperature and humidity imbalances.

2. Temperature issues: Temperature sensors may be faulty or incorrectly calibrated, leading to temperature imbalances.

3. Humidity issues: Humidity sensors may be faulty or incorrectly calibrated, leading to humidity imbalances.

4. Pressure issues: Pressure sensors may be faulty or incorrectly calibrated, leading to pressure imbalances.

Troubleshooting tips:

1. Check the sensors: Verify that the sensors are functioning correctly and calibrated properly.

2. Check the actuators: Verify that the actuators are functioning correctly and not stuck.

3. Check the controller: Verify that the controller is functioning correctly and not malfunctioning.

4. Check the AHU: Verify that the AHU is functioning correctly and not malfunctioning.

5. Check the VAV terminal units: Verify that the VAV terminal units are functioning correctly and not malfunctioning.

Conclusion

The JOHNSON CONTROLS AS VAV111 1 is a reliable and efficient air-side VAV system designed to provide optimal heating and cooling solutions. By understanding its components, operation, and troubleshooting tips, you can ensure optimal performance and extend its lifespan. Remember to regularly maintain and inspect the system to prevent issues and ensure optimal performance.