EQUIPMENT: FIRECLASS DUO-CEL
PUBLICATION: OM_DUO-CEL_APP
ISSUE No. & DATE: 2 20/06/18
PAGE 17 of 46
at low battery voltage and no mains power,
on long cable runs.
b. When mixing different types of sounders on
the same zone, use the lowest quantity
shown in the table. For example, you can
have 12 SQG3/SDR on a zone as long as no
other sounders are connected on that zone.
If you want to mix SQG3/SDR with SQG3/AV
then the TOTAL number of sounders on the
zone should be limited to 8 (e.g. 7 x
SQG3/SDR and 1 x SQG3/AV).
c. DO NOT leave any detector bases empty. All
bases should have a detector fitted or be
linked through. Empty bases will introduce a
diode into the positive line and this will
adversely affect the operation of the
sounders.
d. Reducing the number of sounders WILL NOT
allow more detectors to be used, unless no
sounders are connected (see number in
brackets in the table).
e. All detector bases must have a 1N4002
diode fitted across the line IN and line OUT
terminals (usually on the positive line but
sometimes on the negative line). Some
detector bases come with Schottky diodes
fitted. These are not compatible with the 2-
wire zone operation and must be replaced
with 1N4002 diodes. This applies even if no
sounders are connected. Use of a Schottky
diode will prevent the panel from detecting a
detector head removal.
8. If using detector bases without diodes fitted,
then removal of a detector head will result in an
open circuit of the cable. All devices fitted to the
zone cable beyond the detector head removed
will no longer be powered and will therefore not
operate. Only use detector bases without diodes
if the zone has no 2-wire sounders and no
Manual Call Points, or is configured to Resistor
EOL.
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