heat detector compatibility question with Radionics panel

Discussion in 'Security Alarms' started by gjertsen, Dec 14, 2006.

  1. gjertsen

    gjertsen Guest

    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.
    gjertsen, Dec 14, 2006
    #1
  2. > I see that they list this info for smoke detectors
    > but nothing about compatibility for heat detectors.


    Virtually any heat detector will work with that system. Heats have a dry contact output, like a light switch. When they detect too
    much heat or, in the case of a rate-of-rise sensor, when the temperature is rising very rapidly, they close a circuit. The alarm
    doesn't care what kind of device closes the circuit -- only that it has closed.

    BTW, technically, the circuit is always closed. There's a resistor at the end of the circuit which allows a trickle of current to
    flow all the time. If the current stops flowing due to a cut wire or a device being disconnected, the alarm system will emit a
    "trouble" tone and/or notify the central monitoring station of the problem. When the detector senses fire the circuit is shorted,
    allowing lots of current to flow. The alarm senses this and emits a fire alarm (strobes, siren, bell or buzzers, depending on
    what's installed. If monitored a signal is sent to the station as well.

    --

    Regards,
    Robert L Bass

    =============================>
    Bass Home Electronics
    941-866-1100
    4883 Fallcrest Circle
    Sarasota · Florida · 34233
    http://www.bassburglaralarms.com
    =============================>
    Robert L Bass, Dec 14, 2006
    #2
  3. Heat Detectors do not have to meet compatability requirements because they
    draw no power and will work on any standard fire panel loop unlike bells
    horns trobes smokes etc.

    "gjertsen" <> wrote in message
    news:...
    >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.
    >
    nick markowitz, Dec 15, 2006
    #3
  4. gjertsen

    Nomen Nescio Guest

    gjertsen said:

    >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.


    As others have pointed out, heat detectors are just normally open switches,
    and so there are no compatibility issues. Two-wire smokes draw power, and
    create an alarm over the same wires that deliver power, hence the
    compatibility concerns. System Sensor smokes will work fine, so long as
    you don't use two wire smokes with internal sounders and expect them all to
    sound at once.

    However, your heat and smoke detectors should not be wired directly to the
    8112. They should be wired to a D125 or D129 module, which is attached to
    the side of the 8112 cabinet. The D125 is mandatory if you are using two
    wire smokes. There is no reason you can't mix heat detectors and smokes on
    the same zone, although you might want to know where the fire is.

    Smoke detector reset is done from terminal 8, as I recall, and requires the
    installation of an extra relay in order for the reset code, command-47, to
    work. The relay plugs into the circuit board underneath the sheet metal
    cover.

    - badenov
    Nomen Nescio, Dec 15, 2006
    #4
  5. gjertsen

    gjertsen Guest

    Thanks for all of the helpful comments that everyone provided for a
    novice in this area.
    This will get me started on replacing the old
    detectors, and with some additional digging (looking over the system
    and
    more reading), then I should be able to add the new smoke detectors to
    the
    bedrooms.

    --Rob
    gjertsen, Dec 15, 2006
    #5

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