Smoke detectors and alarm system control panels have specifications for Signaling-Line Circuit (SLC) wiring. Consult
the control panel manufacturer’s specifications for wiring requirements for the particular model control panel being used
before wiring the detector loop.
The D350P detector is designed for ease of wiring. The housing provides a terminal strip with clamping plates. Wiring
connections are made by stripping about
3
⁄
8
-inch of insulation from the end of the wire, sliding the bare end under the
plate, and tightening the clamping plate screw.
Two LEDs on each duct smoke detector may light, if programmed by the system control panel, to provide a local, visible
indication. Remote LED annunciator capability is available as an option. Each duct smoke detector can only be wired
to one remote accessory.
Fire•Lite panels offer different feature sets across different panel models. As a result, certain features of the D350P may
be available on some control panels, but not on others. The possible features available in the D350P, if supported by
the control panel are:
1. Panel controls the LED operation on the duct smoke detector. Operational modes are RED blink, RED continuous,
GREEN blink, GREEN continuous, and off.
2. The remote output may be synchronized to the LED operation or controlled independent of the LEDs.
Please refer to the operation manual for the UL listed control panel for specific operation of the D350P
WIRING INSTRUCTIONS
Disconnect power from the communication line before installing the D350P duct smoke detectors.
Wire the D350P duct smoke detector per the Control Panel Installation Manual and Figures 8, 9 or 10. Set the desired
address on the sensor board code wheel address switches.
NOTE:
Some panels support extended addressing. In order to set
the sensor above address number 99 on compatible systems,
carefully remove the stop on the left hand rotary switch with
pliers as shown in Figure 7.
[7] Perform Detector Check
1. Perform STANDBY AND TROUBLE TEST per Section [9.2.1].
2. Perform MAGNET TEST per Section [9.2.2.1]. The RTS451 test of
Section [9.2.2.2] may substitute for this requirement.
3. Perform AIR FLOW TEST per Section [9.1].
4. Perform SMOKE RESPONSE TEST per Section [9.1.1].
[8] Install The Cover
Install the cover using the six screws that are captured in the housing cover. Be certain filters are installed as specified in
Section [5]. Make sure that the cover fits into the base groove and that all gaskets are in their proper positions. Tighten
the six screws.
[9] Duct Smoke Detector Maintenance and Test Procedures
Test and maintain duct smoke detectors as recommended in NFPA 72. The tests contained in this manual were devised
to assist maintenance personnel in verification of proper detector operation.
Before conducting these tests, notify the proper authorities that the smoke detection system will be temporarily out of
service. Disable the device or system under test to prevent unwanted alarms.
Smoke Entry Tests
[9.1] Air Flow
To verify sufficient sampling of ducted air, use a manometer to measure the differential pressure created from air flow
across the sampling tubes. The pressure should measure no less than 0.03 inches of water and no greater than 1.4
inches of water. The air handler must be operating for this test.
[4.2] Installation For Ducts More Than 8 Feet Wide
NOTE:
To install sampling tubes in ducts more than 8 feet wide, work must be performed inside the air duct. Sampling
of air in ducts wider than 8 feet is accomplished by using the ST-10 sampling tube. If the tube is shorter than
the width of the air duct, install the end cap into the sampling tube as shown in Figure 4 and support the end
opposite the duct smoke detector.
Install the sampling tube as follows:
1. Drill a
3
⁄
4
-inch hole in the duct directly opposite the hole already drilled for the sampling tube. Make sure the hole is 1
″
to 2
″
below the inlet hole on the opposite side of the duct to allow for moisture drainage.
2. Slide the sampling tube with the flange into the housing bushing that meets the air flow first. Position the tube so that
the arrow points into the air flow. Secure the tube flange to the housing bushing with two #6 self-tapping screws.
3. From inside the duct, couple the other sections of the sampling tube to the section already installed using the
1
⁄
2
-inch
conduit fittings supplied. Make sure that the holes on both of the sampling tubes are lined up and facing into the air
flow.
4. Trim the end of the tube protruding through the duct so that 1
″
to 2
″
of the tube extend outside the duct. Plug this end
with the end cap and tape closed any holes in the protruding section of the tube. Be sure to seal the duct where the
tube protrudes.
NOTE:
An alternate method to using the ST-10 is to use two ST-5 sampling tubes. Remove the flange from one of the
tubes and install as described above. After the installation, use electrical tape to close off some of the sampling
holes so that there are a total of 10 to 12 holes spaced as evenly as possible across the width of the duct.
NOTE:
Air currents inside the duct may cause excessive vibration, especially when the longer sampling tubes are used.
In these cases a 3 inch floor flange (available at most plumbing supply stores) may be used to fasten the sam-
pling tube to the other side of the duct. When using the flange/connector mounting technique, drill a 1-inch to
F300-10-00 4 I56-0020-004R
F300-10-00 5 I56-0020-004R
Figure 6. Sampling tube filter installation:
1
1
⁄
4
-inch hole where the flange will be used.
[5] Install The Filters
To install the sampling tube filters, simply push the filters
into the sampling and exhaust tube holes, as shown in
Figure 6. If a metal sampling tube is used, install the filters
over the tube end.
[6] Field Wiring Installation Guidelines
All wiring must be installed in compliance with the National
Electrical Code and the local codes having jurisdiction.
Proper wire gauges should be used. The conductors used
to connect smoke detectors to control panels and acces-
sory devices should be color-coded to prevent wiring mis-
takes. Improper connections can prevent a system from
responding properly in the event of a fire.
CAUTION
Filters require periodic cleaning or replacement, depending on the amount of dust and dirt accumulated. Visually inspect
the filters at least quarterly; inspect them more often if the dust accumulation warrants it. See Section [9.1.2] for more
information. Replacement filters can be ordered (filter P/N F36-09-11).
For signal wiring, (the wiring between detectors or from detectors to auxiliary devices), it is usually recommended that
single conductor wire be no smaller than 18 gauge. The duct smoke detector terminals accommodate wire sizes up to 12
gauge. The last foot of conduit should be flexible conduit (available in electrical supply houses), which facilitates easier
installation and puts less strain on the conduit holes in the housing. Solid conduit connections may be used if desired.
BREAKAWAY STOP
Figure 7. Rotary Address Switches
