Re: Replacing Radionics with Vista 20P

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

Christopher Glaeser wrote:
>> The EOL for a smoke alarm must be at the last device.
>
> It is two wire smokes and they used four wires to bring the EOL back to
> the panel. The smokes are model 2100TD.
>
> I did the following measurements.
>
> - Voltage at panel across 8 and 9 without smokes is 13.6 VDC
>
> - Voltage across 8 and 9 with 2K resistor is 13+ VDC. Panel works fine
> with resister.
>
> - Resistance across red and black fire wires is 2K.
>
> - Voltage across 8 and 9 with smokes attached is 13+ VDC
>
> - Voltage across EOLR is 13+ VDC
>
> - Voltage at smoke is 13+ VDC
>
> I guess the next step is to separate the smokes and test one at a time.
> Any other suggestions?
>
> Best,
> Christopher
>
>
>

I would leave the wiring alone for the moment. Take down one smoke at a
time and verify how its wired. If the EOL is at the panel, then you
should have that color pair spliced right through each smoke.

For Example: Red & Black feeds from one smoke to the next. It then
returns back from the last smoke on the green & white pair.

If this is the way it is wired, you are ok with the EOL at the panel.

Jim Rojas
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