Re: Replacing Radionics with Vista 20P

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

RockyTSquirrel wrote:
> Jim  wouldn't  the 4 conductor  return as Joe was saying  be the same as
> a class A so long as the resistor was in the cabinet of the control?
> (just asking)
>
> RTS
>
> "Jim Rojas" wrote in message news:7Mh_o.13$be.3@xxxxxxxxxxxxxxx
>
> 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
>>
>
> The EOL for a smoke alarm must be at the last device.
>
> If you are using 2 wire smokes, you can use 2 wires, then EOL at last
> smoke. All smokes must be daisy chained for proper supervision...
>
> 2 Wire Smokes
>
> Fire Zone + ---> + in + out ---> + in
> + out ---> + in + out ---> EOL
> Fire Zone - ---> - neg ---> - neg ---> - neg ---> EOL
>
>
> If you are using 4 wire smokes, the same is true with the addition of
> using a power supervision relay at the end of line. With 4 wire smokes,
> do not twist wires together, even though the are going on the same
> terminal. This provides better supervision against tampering.
>
> 4 Wire Smokes
>
> Fire Zone + ---> C ---> C ------------------------------> EOL
> Fire Zone - ---> NO ---> NO ---> Relay Closed Contacts ---> EOL
> Power + ---> + ---> + ---> Relay coil
> Power - ---> - ---> - ---> Relay coil
>
> Jim Rojas
> Technical Manuals Online!
> http://www.tech-man.com
> 8002 Cornwall Lane
> Tampa, FL 33615-4604
> 813-884-6335

Yes, or course. But using standard NC contacts defeats the purpose intended.

Jim Rojas
Technical Manuals Online!
http://www.tech-man.com
8002 Cornwall Lane
Tampa, FL 33615-4604
813-884-6335