Fan array calibration - Johnson Controls - LIT-12014081 - RA-1270 - Airflow Measuring Station - AFMS

RA-1270 Advanced Thermal Dispersion Fan Inlet Airflow and Temperature Measuring System Technical Bulletin

Brand
Johnson Controls
Product name
AFMS
Document type
Technical Bulletin
Document number
LIT-12014081
Revision date
2022-08-04
Language
English

Procedure

The fan array calibration process outlines the Fan Array Calibration of 1-, 2-, or 3-points. Follow this process when the configured fans are part of a fan array that all share the same airflow. To calibrate the fan array, complete the following steps:

  1. In the Supervisor Menu, navigate to Fan Arry Config and press ENTER.
  2. Navigate to Fan Arry Cal and press ENTER. The display prompts to enter the fan diameter that all fans in the fan array share. Use UP and DOWN to adjust the currently blinking digit. Press ENTER to advance to the next digit or confirm the value when on the last digit. Press ESC to go back a digit or cancel the value entry when on the first digit.
  3. After confirmation of the diameter value, the calculated area displays. Use UP and DOWN to select Edit or Confirm and press ENTER. Edit enables manual editing of the area.
  4. Tne next screen displays Press Enter to Calibrate. Press ENTER.
  5. Use UP and DOWN to select the number of points to calibrate the previously selected fan. Press ENTER to confirm the selection
  6. A confirmation screen displays as shown in Figure 1. Press ENTER to continue or press ESC to return to the previous step.
    Figure 1. Confirmation screen
  7. Enter the airflow of the total fan array as a volumetric value. The CFM is default, and the unit is based on the display settings. Use UP and DOWN to adjust the currently blinking digit. Press ENTER to advance to the next digit or confirm the value when on the last digit. Press ESC to go back a digit or cancel the value entry when on the first digit.
  8. When the fan is at the required speed for point 1 of the calibration, confirm the value. The entered value must be within the operating range of 0 fpm to 10,000 fpm and multiplied by the area of the fan inlet to achieve the equivalent volumetric value.
  9. After you enter the airflow value, the Per Fan Velo and Per Fan Volume values displays. When the number of points is 1, the entered value must be greater than 0.
  10. Press UP and DOWN to scroll between the Per Fan Velo and Per Fan Volume. Press ENTER to continue. Press ESC to return to the previous step.
  11. A screen prompts to continue when the system is stable. Press ENTER to continue or press ESC to return to Step 6.
  12. The sensors are measured and the displays shows as in the following figure.
    Figure 2. Sensor measuring
  13. After the sensors are measured, the display shows that the calibration point is running then shows success or failure. Depending on the number of fans, the progression from running to success or failure can be quick. Press ENTER to continue if successful.
  14. If failed, press ENTER to return to Step 6 at the current calibration point. For each calibrated fan, a character shows its status:
    • W indicates the fan is waiting on a previous fan or processing the point.
    • S indicates the fan is successful. See Figure 3.
    • F indicates the fan failed that calibration point. See Figure 4.
    A fan can fail a calibration point if either of the following are true:
    1. The measured or referenced value was higher than the previous point.
    2. The associated monitor or sensor is not responding or the sensor is not valid.
    Figure 3. Successful fan calibration
    Figure 4. Failed fan calibration
  15. Repeat Step 6 to Step 13 for any remaining calibration points.
  16. After successful completion of the final calibration point, a confirmation screen displays as shown in the following figure. Press ENTER to complete the calibration. Press ESC to return to the last calibration point at Step 6.
    Figure 5. Confirmation screen
  17. The display shows that the device is completing the calibration. Depending on the number of fans, this can progress quickly to complete. Press ENTER to continue.
  18. After completion, a prompt to view the calibration displays. Press ENTER to step through the fans and their associated sensors calibration points. Continue to Step 18. Press ESC to complete the process at this step and return to the Fan Array Configuration menu.
  19. The display starts with Fan 01 Sens 1. Press ENTER to view the displayed sensors calibration data.
  20. Press ENTER to progress forward through the calibration data. Press ESC to go back a screen.
  21. When the calibration data for all fan sensors displays, a confirmation screen displays. Press ENTER to complete the viewing stage and return to the Fan Array Configuration menu. Press ESC to return to viewing the calibration data.