TheAlarmTech.com

Hi,
I'm just trying to inspect this panel. Someone wrote instructions on how to disable the actions for NAC and AHU shutdown, the directions seemed simple enough, everything looked like it worked, the panel had a trouble on it. I hit a pull station and lit up the occupied building. WTF?! I don't mind pulling the NACs, but none of the wiring is labeled, the circuit board isn't labeled, I can't find a diagram online, I called EST, they said they won't help me because I'm not an EST Tech, I tried pulling some wires off to see if the panel would say NAC Trouble, but none of that has gotten me anywhere.

I pulled a horn in the field and measured the resistance, I got about 15K. I started pulling wires off the panel until I found wiring with matching resistance. I had two, two conductor, wires on the CM1, TB4 that had ~14-15K. Pulling those gave me a NAC Trouble. I held my breath and hit a pull station, no sound.