Changing a Xenta 102-AX or MR-VAV-AX from SI to Imperial Units using an M/STAT

[Product_Support]

Issue

STR-250 Wall Stat displaying °C instead of °F

Environment

• Xenta 102-AX
• M/STAT
• MR-VAV-AX
• I/NET
• Vista

Cause

Device is set to incorrect Engineering Units

Resolution

1. Plug the M/STAT into the jack on the thermostat.  The initial display shows the set temperature.
2. Press the Service button.  This prompts you to enter the service mode password.  Default password is 183.  Use the +/- keys to set each digit and the enter key to submit.  If the password is incorrect, the display will blink.
3. If the password is correct, the first menu option – Unit Parameters (UP) – is displayed.  Press enter.
4. Hit the select button until Engineering Units (EU) is displayed.  Press enter to view the current value.
5. Use the +/- keys to change the value between Systeme International (Si) and Imperial Units (iu), press enter.
6. Press the service key to escape out of the menu.  If you are finished configuring the box, escape all the way back out of the service menu before disconnecting the M/STAT.  Disconnecting in configuration mode can leave the stat displaying “00” or other incorrect numbers.