One of my customers moved to a house that already had an alarm system insta lled. Vista 20 panel with a zone expander, two keypads and get this...? ??
10 motion detectors and 9 audio glass break detectors. Two out of three doo rs have hard wired contacts. The third door has no contact (depends on moti on detector for detection). No windows have contacts. The motions detectors and the glass break detectors are located in the corn er of each room BUT ?.. they are mounted side by side on the flat s urface of the wall in the corner. In other words, the motion detector only covers half the room and the glass break detectors don't face the windows.But, get this ?.. there was an addition put on the house. So the l0 th motion detector is mounted in the dirt floor three foot high crawl space under the addition that is separated from the original basement by the old foundation wall that has two basement windows as access. I guess because t he crawl space has an outside entrance. however, the two basement windows a re covered by a motion detector and a glass break detector located in the f inished basement.
There are three self contained 30 watt sirens in each of 3 attic vents powe red with an auxiliary power supply through a relay and the power supply als o powers all the glass breaks and motion detectors. No aux power is drawn f rom the panel. I'm guessing they did it that way because they had a problem sharing the power with the panel because they didn't know that you had to have a common ground between the supplies and they couldn't get it to work right.
There's also a smoke detector in the boiler room.
So ??. fix that ?.. why doncha!
I'm guessing that this is a perfect example of a DIY project.
Ya just don't know ????. what ya don't know .