Re: heat detector compatibility question with Radionics panel

["Roland" <roland@xxxxxxxxxxxx>]

Message-ID: <%0hgh.43637$qp1.27533@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 14 Dec 2006 18:49:31 GMT

>I see that they list this info for smoke detectors but nothing about
>compatibility for heat detectors.

The only thing I'd be worried about is the proper temperature rating for the
application. (Hint: Don't use a 135 degree in an attic)
Also heat and heat with rate of rise are not typically used for life safety
applications and that is the primary reason for detectors in a residence.

>but my reading indicates that I can hook up more 4-wire alarms without a
>limitation, so I wanted to confirm that adding 3 4-wire alarms hooked up to
>the original >4-wire would work fine (and allow me to have 11 detectors in
>one zone).

There is a limit on 4 wire smokes and that is (for the most part) the total
draw on the panel output in standby and alarm. You can do the math but the
addition you mention should not be a problem if you're describing conditions
accurately.


"gjertsen" <gjertsen@xxxxxxxxxx> wrote in message
news:1166109051.970756.302980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I have an old timey D8112 Radionics panel at my new house and want to
> replace the original heat detectors and smoke detectors. I don't want
> to
> replace the security panel at this time given that it works OK.
> Looking at the compatibility
> charts for this (and the web site compatibility info at Bosch and
> System Sensor)
> I see that they list this info for smoke detectors but nothing about
> compatibility
> for heat detectors. Is it safe to assume that I won't have an issue
> with
> the heat dectectors from a particular vendor? (I have 7 2-wire heat
> detectors and
> a 4-wire smoke detector in one zone with a 12V line)
> I suspect that is the case given that I currently have Edwards GS heat
> detectors
> installed. I'm leaning towards System Sensor detectors because it
> appears to
> be a challenge to find Bosch vendors online (and would use the same
> vendor
> for all the detectors).
>
> I'd also like to add 3 smoke detectors (for bedrooms for a total of
> 11). Pubs indicate
> that there is 10 detector limit for one zone with 2-wire alarms.
> Not sure why a 4-wire was put on the
> system for single smoke detector, but my reading indicates that I can
> hook up more 4-wire alarms without
> a limitation, so I wanted to confirm that adding 3 4-wire alarms hooked
> up to the
> original 4-wire would work fine (and allow me to have 11 detectors in
> one zone).
> I'd planned on letting someone else do this part, but having trouble
> getting someone to
> do the work without trying to sell me an upgraded Bosch/Radionics
> security panel.
>
> Thanks for any pointers.
>