Re: Replacing Radionics with Vista 20P

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

Christopher Glaeser wrote:
> I found the EOLRs.  There is a small faceplate below the old Radionics,
> so I opened it and found a rats nest where all the wires come together.
> As best I can tell, the zones with multiple sensors are wired in
> parallel just below the panel, and the 1K EOLR is also added just below
> the panel. Doesn't this defeat the purpose of an EOLR? Isn't this really
> just a BOLR? Also, if an EOLR is at the panel for a fire zone, is this
> to CA code?
>
> Best,
> Christopher
>

EOL's are useless for residential burg systems unless you use the proper
contact. A standard normally closed contact will not work unless each
contact is on its own zone, and the EOL is inside the contact.

On a commerical contact both the normally open and normally closed is
used to supervise the wire at all times. The contact then triggers an
alarm on a short, but show a trouble on an open circuit. This is the
proper way for EOL usage. You can place the EOL's at the panel, but on a
commercial applications, this means that the last contact returns back
to the panel.

Zone + ---> C       NC ---> C
Zone - ---> NO ---> N0 ---> NO ---> EOL in field
             NC ---> C       NC ---> EOL

OR

Zone + ---> feed to 1st contact
Zone - --->
EOL  - <--- return from last contact
EOL  + <---


Jim Rojas
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