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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 chamber,

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 self-

diagnostics 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

JP3

3 2 1

Table 1:Jumper settings

Settin

g Operation Description

-2 Alarm

Factory Default: Configures the detector

for alarm latching operation

-3 Supervisory

Configures the detector for supervisory

operation

LED operation

The detector provides two LEDs, visible from the front side of

the detector, that show its status.

LED

Description

Power LED

Off when the detector is in the alarm state

Flashes intermittently when the detector is in

the normal state

Alarm/active LED

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.

• 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 instructions 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 information can be found

in Technical Bulletin P/N 3101212.

Summary of content (6 pages)

PAGE 1
E-PDD Duct Smoke Detector Installation Sheet Operation LED 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. The detector provides two LEDs, visible from the front side of the detector, that show its status.
PAGE 2
Installation guidelines 3. 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.
PAGE 3
5. Mount the duct smoke detector on the HVAC duct and secure it using two sheet metal screws provided. 6. If using an air sampling tube that is longer than the width of the duct, cut the tube so that approximately one inch of the tube extends through the duct. Seal the opening around the tube with an approved duct sealant as shown in Figure 4. Figure 4: Duct detector installation Use a screwdriver to adjust the two rotary switches on the front of the module.
PAGE 4
Figure 7: Air pressure differential Sampling tube To clean the duct smoke detector: 1. Disable the detector/zone to prevent false alarms. 2. Remove the detector’s cover then power down the detector by disconnecting the SLC wiring. 3. Using a vacuum cleaner, clean compressed air, or a soft bristle brush, remove loose dirt and debris from inside the detector housing and cover. 4. Remove dirt and other contaminants from the gasket on the detector’s cover using isopropyl alcohol and a lint-free cloth.
PAGE 5
Figure 9: Duct detector wiring Alarm/active + Remote alarm/active indicator [1] − or 1 Alarm/active Remote test station [1] 2 Test 3 Auxiliary equipment [2] 4 SLC(−) SLC(+) 11 10 9 SLC(−) SLC(+) 4 5 5 6 7 89 3 6 4 7 10 2 3 11 1 2 8 1 0 12 0 9 8 7 6 3 2 1 Power indicator JP3 Alarm indicator 5 4 3 2 1 Notes [1] No more than one remote test station or LED indicator can be connected to the detector at the same time. Wiring is unsupervised. Maximum wire resistance is 10 ohms per wire.
PAGE 6
Specifications Communication line voltage Maximum 20 V peak-to-peak Operating current Normal Alarm Inrush 45 µA 45 µA 1 mA Common alarm relay/auxiliary equipment Unsupervised and power-limited Quantity: 1 Type: Form C Ratings: 2.0 A at 30 VDC (resistive) Air velocity 100 to 4,000 ft./min Air pressure differential 0.005 to 1.00 inches of water Smoke sensitivity range 0.79 to 2.46%/ft.