Edwards Signaling E-PDD User Manual
JP3
3 2 1
Settin
1
2
LED
Power LED
Flashes intermittently when the detector is in
Alarm/active LED
E-PDD Duct Smoke Detector Installation Sheet
Operation
The duct smoke detector's primary purpose is to provide early
warning of an impending fire and shut down the HVAC unit in
order to prevent smoke from circulating throughout the
building. The duct smoke detector is designed for use in duct
applications where temperatures can exceed standard detector
capabilities.
Air is introduced to the duct smoke detector's sensing chamber
through a sampling tube that extends into the HVAC duct and
is directed back into the ventilation system through an exhaust
tube. The difference in air pressure between the two tubes
pulls the sampled air through the sensing chamber. When a
sufficient amount of smoke is detected in the sensing cham ber,
the duct smoke detector notifies the fire alarm control panel.
The device address is set using the two rotary switches located
on the front of the unit. One device address is required.
The detector is capable of performing comprehensive selfdiagnostics and storing the results.
In installations where the duct smoke detector’s controls and
indicators are hidden from view, a remote test station or an
LED indicator can be connected to the detector to provide
these functions.
Jumper setting operation
The following jumper settings determine the operation of the
detector.
Figure 1: Jumper setting
LED operation
The detector provides two LEDs, visible from the front side of
the detector, that show its status.
Description
Off when the detector is in the alarm state
the normal state
Indicates the detector is in the alarm/active
state as follows:
Flashes at a continuous rate if the first
detector is in alarm/active
Flashes intermittently if not the first detector
in alarm/active
Installation
WARNINGS
• The duct smoke detector is not intended as a substitute for
open area protection.
• This detector will not operate without electrical power. As
fires frequently cause power interruption, you should
discuss further safeguards with your local fire protection
specialist.
• The duct smoke detector will not operate as designed
outside of the listed electrical and environmental
specifications.
Table 1:Jumper settings
g Operation Description
-2 Alarm
-3 Supervisory
© 2013 UTC Fire & Security. All rights reserved. 1 / 6 P/N 3101210 • REV 02 • ISS 28JAN13
Factory Default: Configures the detector
for alarm latching operation
Configures the detector for supervisory
operation
• The duct smoke detector will not sense smoke unless the
ventilation system is operating and the sensor’s cover is
properly installed.
• The duct smoke detector may not operate as designed
unless installed in accordance with these instru ctio ns and
all applicable national and local codes as determined by
the local authority having jurisdiction.
Note: Read these instructions thoroughly before installing. In
addition to this document, important infor mation can be found
in Technical Bulletin P/N 3101212.
Installation guidelines
Model
SD
SD
SD
SD
SD
SD
SD
SD
Detector
Sampling tube
socket
Exhaust tube
Thick
gasket
Thin
gasket
Exhaust tube
socket
Coupling
Sampling tube
(ordered separately)
Plug
Sampling tube
connector
Sampling tube
(fully assembled)
Detector
To ensure correct operation, install the duct detector using the
following guidelines:
• Install the duct smoke detector on a flat section of HVAC
duct between six and ten duct widths from any bends or
obstructions.
• Install supply-side detectors at a point downstream from
the supply fan and after the air filter.
• Install return-side detectors at a point before the return air
stream is diluted by outside air.
Verify the duct air velocity
In order to verify airflow direction and velocity, air must be
moving through the HVAC system.
To verify the duct air velocity:
1. Drill a small hole at the point where the duct smoke
detector is being installed.
2. Using the SD-VTK Air Velocity Test Kit and a suitable air
velocity meter, verify that the air velocity in the HVAC duct
falls within the specified operating range of the detector
and note which direction the air flows.
3. If the air velocity does not fall within the specified rang e,
relocate the detector and seal the hole in the HVAC duct.
Refer to Technical Bulletin P/N 3101212 for additional
information pertaining to installation locations.
Select the appropriate sampling tube:
3. The sampling tube is normally installed from the rear, but it
can also be installed from the front of the detector as
shown in Figure 3. This method requires that you remove
the detector cover.
Figure 2: Duct detector assembly
Figure 3: Sampling tube installa t io n
• Select a sampling tube that extends at least two-thirds
• For duct widths greater than 36 inches, use a sampling
• Sampling tubes are available in the following lengths:
To assemble the detector:
1. Assemble the duct smoke detector as shown in Figure 2.
2. Rotate the air sampling tube so the inlet holes face the
across the width of the duct.
tube that is longer than the width of the duct.
Description
-T8 8-inch sampling tube
-T18 18-inch sampling tube
-T24 24-inch sampling tube
-T36 36-inch sampling tube
-T42 48-inch sampling tube
-T60 60-inch sampling tube
-T78 78-inch sampling tube
-T120 120-inch sampling tube
direction of airflow.
To install the detector:
1. Attach the drill template to the HVAC duct at desired
mounting location.
2. Drill (or punch) the mounting holes where indicated.
Note: Sampling tubes longer than 36 inches must be
supported at both ends of the duct.
3. If using an air sampling tube that is longer than the width
of the duct, drill a 3/4-inch hole on the opposite side of the
duct for tube to pass through.
4. Remove any rough edges from the holes.
2 / 6 P/N 3101210 • REV 02 • ISS 28JAN13
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