Manual fan field-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

Note: It is advised to use the 1-, 2-, or 3-point automatic fan field-calibration process instead of manual fan field-calibration. Use the manual gain and offset menus to restore recorded values from a previous calibration.
Table 1. Field-calibration configuration selections and options
Configuration selections Configuration options
Field Calibration Enable Enables the field-calibration of manual or calculated gain and offsets to be applied to the selected fan’s final output.
Use Calculated Calibration Sets if the fan uses the manual gain and offset values or a 1- to 3-point calculated calibration. When set to No, the fans use the manual gain and offsets.
Field Calibration Gain Sets the gain value of the selected fan’s final output from 0.25 to 2.0. Only available with Use Calculated Calibration set to No.
Field Calibration Offset Sets the offset value of the selected fan’s final output from -750 fpm to 750 fpm. Only available with Use Calculated Calibration set to No.

To configure manual fan field-calibration, complete the following steps in the Supervisor Menu:

  1. Navigate to Fan Arry Config and press ENTER. The display shows Number of Fans > Sensors Per Fan.
  2. Navigate to Field Cal Cfg and press ENTER.
  3. Use UP and DOWN to select the fan and press ENTER to confirm the selection. Selection is limited to the number of fans previously setup.
  4. The display shows FCal Enable > Use Calc'd Cal. Select FCal Enable and press ENTER.
  5. Use UP and DOWN to enable the field-calibration adjustment as ON. Press ENTER to confirm the selection.
  6. Navigate to Use Calculated Calibration. The display shows FCal Enable? > Use Calc'd Cal?. Select Use Calc'd Cal? and press ENTER.
  7. Use UP and DOWN to select No. If the previously selected fan uses a calculated calibration process, see Fan field calibration - calculated.
  8. Navigate to Manual Gain and press ENTER.
  9. If Sensors Per Fan is set to 1, skip to Step 10. If Sensors Per Fan is set to 2, the device prompts a selection of the fan sensor to adjust its values. Use UP and DOWN to select the sensor to adjust and press ENTER. Repeat Step 7 and Step 8 for both sensors, if required.
  10. Use UP and DOWN to adjust the currently blinking digit. The display shows as in Figure 1. 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.
    Figure 1. Gain setting
  11. Navigate to Manual Offset and press ENTER.
  12. If Sensors Per Fan is set to 1, skip to Step 13. If Sensors Per Fan is set to 2, the device prompts a selection of the fan sensor to adjust its values. Use UP and DOWN to select the sensor to adjust and press ENTER. Repeat Step 10 and Step 11 for both sensors, if required.
  13. Use UP and DOWN to adjust the currently blinking digit. The display shows as in Figure 2. 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.
    Figure 2. Offset setting
  14. Navigate to Exit this Menu and press ENTER.
  15. Repeat Step 1 to Step 13 for each fan to be calibrated.