Data Sheet for Product

s Canada Limited
Specifications ─ (continued)
The remote alarm indicator (Model FDBZ-RTL) allows for
manual testing via a key-switch for the conventional
detector as well as the conventional air-duct housing
with relay. Model FDBZ-RTL, which mounts remotely
from the conventional air-duct housing, allows for
manual relay-output control. The duct-detector remote
indicator key-switch also indicates the current state of
the detector.
The watertight housing (Model FDBZ-WT), which allows
the air-duct detector housing to be installed inside the
separate NEMA 4X enclosure, is for installations for
either an outdoor area or in environments where
excessive moisture is prevalent.
Each detector unit employs a cross-sectional sampling
principle of operation.
Inlet sampling tubes are
available in four (4) lengths (see:
Sampling Tube
Selection Table
). Outlet sampling tubes are one (1)
common length and draw. A continuous, cross-
sectional sample of air moves through the duct.
Stratification or skin affect phenomenon that occurs in
the duct can prevent smoke (especially in large ducts)
from reaching a spot-type detector.
In addition, the unique design of the sampling chamber
insures uniform sensitivity in air velocities, ranging
from a low of 31 mpm to as high as 1,219 mpm.
Each housing comes with three (3) wiring entry ports:
 Two (2) 3/4” conduit knockouts
 One (1) 1/2” conduit opening
The inlet sampling tube length is determined by the
width of the air duct being protected. The inlet tube
─
greater than and nearest to the duct width
─ should be
used (see:
Sampling Tube Selection Table). The inlet
tube can then be trimmed at the job site to the exact
width of the duct. The outlet sampling tube for all ducts
─ irrespective of width ─ has a fixed length of
approximately 5.5 inches (14cm.), and is supplied with
the air-duct housing.
Note: When the use of a remote relay is required, order
Model FDBZ492-R for conventional systems;
Model FDBZ492-HR for addressable systems.
When required, a separate watertight enclosure
(Model FDBZ-WT), which is designed to contain
the air-duct housings is available.
(For full details, refer to installation instructions for the
respective air-duct housing.)
Note: When a self-contained duct detector with power supply
is required, order Model FDBZ492-RP.
(For full details, refer to installation instructions part
number A6V10330327.)
Sampling Tube Selection Table
Duct Width
Sampling Tube
(Model No.)
For duct widths 15.2 cm. to 30.5 cm. ST-10
For duct widths 30.5 cm. to 91.4 cm. ST-25
For duct widths 91.4 cm. to 152.4 cm.
(requires support)
ST-50
152.4 cm. to 305 cm.
(requires support)
ST-100
Maintenance of the detector is easily accomplished
via the removal of the duct-housing sampling
chamber cover. The detector, which plugs into the
housing, is easily removed for cleaning or replacing by
a trained technician.
All that is necessary for installation of the air-duct
detector is the cutting of three (3) small holes for the
Sampling Tube installation (template included), and
the drilling of two (2) holes for mounting the air-duct
housing. The unit is then easily mounted in place,
and connection made to the existing wires or
terminals
─ if optional accessories are utilized. No
mechanical tools are required for removing the cover or
connecting the sampling and exhaust tubes to an air-
duct housing.
Models ST-50 and ST-100 require support.
However, Model ST-100 is shipped in two (2) 5-ft.
(152 cm.) pieces with a coupling for field assembly.
Technical Data
Operating
Temperature
0°C (32°F) to 49°C (120°F)
Ranges:
Sampling Tube Pressure >
0.026 cm.
Range of Differences:
< 3.1 cm. of water column
Relative Humidity: 0 ─ 95%; non-condensing
Air Pressure /
No effect /
Altitude Range:
No limitations
Air-Duct Velocity:
31 ─ 1,219 meters / min
Dimensions: { H -x- W -x- D }
 Rectangular: 37 cm. -x- 12.7 cm. -x- 6.36 cm.
(14.38” -x- 5” -x- 2.5”)
 Square: 19.7 cm. -x- 22.9 cm. -x- 6.36 cm.
(7.75” --x-- 9” --x-- 2.5”)
Detector Weight: 0.82 Kg. (1.8 Lbs.)
Notes to Architect: When building codes regulate the location of
detectors within ventilating systems, make
sure the number and locations of detectors are
in accordance with the code regulations.
For additional electrical specifications,
please see the installation instructions
of the corresponding air-duct housing.