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 sampling tube to the other side of the duct. When using
the flange/connector mounting technique, drill a 1-inch to 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 into 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 accessory devices should be color-coded to prevent wiring mistakes. 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 con-
nections may be used if desired.
Smoke detectors and alarm system control panels have specifications for
Signaling-Line Circuit (SLC) wiring. Consult the control panel manufactur-
er’s specifications for wiring requirements for the particular model control
panel being used before wiring the detector loop.
The DH300PL detector is designed for ease of wiring. The housing pro-
vides 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 detec-
tor can only be wired to one remote accessory.
Johnson Controls fire panels offer different feature sets across different panel models. As a result, certain features of the DH300PL may be available
on some control panels, but not on others. The possible features available in the DH300PL, 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 DH300PL
WIRING INSTRUCTIONS
Disconnect power from the communication line before installing the DH300PL duct smoke detectors.
Wire the DH300PL duct smoke detector per the Control Panel
Installation Manual and Figures 9, 10 or 11. Set the desired
address on the sensor board code wheel address switches
.
J500-42-00
4
I56-2198-003R
Figure 6. Sampling tube filter installation:
H0138-00
