Issue
Updating the UPD Files for MR-AHUs
Environment
I/NET Seven Site
Cause
How to download a different application to an MR-AHU in order to control the economizer damper
Resolution
There are times when the user needs to download a different application to an MR-AHU in order to control the economizer damper in a different way. To do so you must configure I/NET for which specific .UPD file to load by editing ASC.cnf. It is located within the I/NET Seven Data subdirectory and the default path is I/NET Seven\Data\ASC.cnf.
- As a safety measure, save the default version of the ASC.cnf file, giving it a different name, such as “BackupASC.cnf”.
- Open the ASC.cnf text file with MS Notepad text editor.
- Find the line that reads "2-4-2.10=AHU_2210".
- Place a colon “:” and a space at the beginning of that line. (The colon and space act as a comment flag and I\NET ignores those lines when it's time to download.)
- Then find the line which reads ": 2-4-2.10=AHU_2100" and remove the colon at the beginning of that line.
- Save the modified ASC.cnf file and close notepad.
This tells I\NET that you want to download the version which controls the economizer damper based on room temperature. The default setting causes I\NET to download the application which controls the damper based on mixed air temperature. The MR-AHU is shipped from the factory with the 2100 application so if you want to change to mixed air control (2210), just update ASC with no changes.
To actually load the UPD file into the controller, open I/NET, connect to the SLI, choose edit-controller-ASC functions. Choose "Update ASC, then select which controllers you wish to change. Click OK and when prompted for the file path, click OK or hit enter. This causes I\NET to download from the default (data) directory.
If this ASC has already been in use and it's point database updated to the SLI, one more step is necessary. The ASC, having just been loaded with the default application, has default designations for the station parameters and point types. The SLI may not have them in the same locations. To force them to be equalized:
- Open the MCU_configuration
- Select the ASCs in question
- Set them to internal
- Click OK
- Re-open MCU_configuration
- Set them back to ASC
- Click OK.