SYSTEM SENSOR D2 2Wire Photoelectric Duct Smoke Detector Instruction Manual

SYSTEM SENSOR D2 2Wire Photoelectric Duct Smoke Detector

Product Information

The D2 Duct Smoke Detector is a device designed to detect smoke in air ducts of various sizes and shapes. It can operate at temperatures ranging from 0 to 93% relative humidity, with an air velocity of 100 to 4000 ft./min. The rectangular footprint dimensions are 14.38 in L x 5 in W x 2.5 in D, and the square footprint dimensions are 7.75 in L x 9 in W x 2.5 in D. The device weighs 1.8 pounds and has a power supply voltage of 8.5-35 VDC.

Product Usage Instructions

1. Before installing the Duct Smoke Detector, read the System Sensor Guide for Proper Use of Smoke Detectors in Duct Applications (A05-1004), which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available online at www.systemsensor.com. Also, reference NFPA Standards 72 and 90A for detailed information.
2. The device must be operated within ALL specified electrical and environmental specifications listed in the product manual. Failure to comply with these requirements may prevent the detector from activating when smoke is present in the air duct.
3. This device will not operate without electrical power. Fire situations may cause an interruption of power. The system safeguards should be discussed with your local fire protection specialist.
4. The device will not sense smoke unless the ventilation system is operating, and the cover is installed.
5. The detector must be tested and maintained regularly following NFPA 72 requirements. The detector should be cleaned at least once a year.
6. Accessory current loads at 24 VDC for devices are as follows: -RA400Z: Peak standby current – 0mA; Average standby current – 0mA; Max. alarm current – 12mA Max. -RTS451: Peak standby current – 0mA; Average standby current – 12mA Max.; Max. alarm current – 12mA Max. -RTS451KEY: Peak standby current – 12mA Max.; Average standby current – 12mA Max.; Max. alarm current – 12mA Max. 7. The National Fire Protection

Association has established that DUCT DETECTORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DETECTOR PROTECTION as a means of providing life safety. Nor are they a substitute for early warning in a building’s regular fire detection system. Following these usage instructions will help ensure that the Duct Smoke Detector functions properly and provides an early warning in case of a fire in the ventilation system.

Specifications

• Operating Temperature : –4° to 158° F (–20° to 70° C)
• Storage Temperature: –22° to 158° F (–30° to 70° C)
• Humidity: 0% to 93% Relative Humidity Non-condensing
• Air Velocity: 100 to 4000 ft./min. (0.5 to 20.3 m/sec.)
• Rectangular Footprint Dimensions: 14.38 in L x 5 in W x 2.5 in D (37 cm L x 12.7 cm W x 6.36 cm D)
• Square Footprint Dimensions: 7.75 in L x 9 in W x 2.5 in D (19.7 cm L x 22.9 cm W x 6.35 cm D)
• Weight: 1.8 pounds; 0.82 kg

ACCESSORY CURRENT LOADS AT 24 VDC

DEVICE| STANDBY| ALARM
RA400Z| 0mA| 12mA Max.
RTS451| 0mA| 12mA Max.
RTS451KEY| 12mA| 12mA Max.

Electrical

• Power supply voltage : 8.5-35 VDC
• Input capacitance : 0.1 μF max.
• Reset Voltage : 2.5 VDC min.
• Reset Time ( with RTS451): .03 to 0.3 sec.
• Reset Time ( by power down): 0.3 sec. max.
• Power Up Time: 35 sec. max.
• Alarm response time: 15 sec.
• Sensitivity Test : See detector label
• Current Requirements ( Using No Accessories)
• Peak standby current 120μA
• Average standby current 60μA
• Max. alarm current 130 mA

The D2 model is a photoelectric detector approved for an extended air speed range of 100 to 4000 feet per minute (0.5 m/s to 20.3 m/s) and an operational temperature range of −4°F to 158°F (−20°C to 70°C).

Before Installing

Read the System Sensor Guide for Proper Use of Smoke Detectors in Duct Applications (A05-1004), which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available online at www.systemsensor.com. NFPA Standards 72 and 90A should also be referenced for detailed information.
NOTICE : This manual shall be left with the owner/user of this equipment. IMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. The detector should be cleaned at least once a year.

Limitations Of Duct Smoke Detectors

The National Fire Protection Association has established that DUCT DETECTORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DETECTOR PROTECTION as a means of providing life safety. Nor are they a substitute for early warning in a building’s regular fire detection system. System Sensor supports this position and strongly recommends that the user read NFPA Standards 90A, 72, and 101. The D2 Air Duct Smoke Detectors are listed per UL 268A.

• This device will not operate without electrical power. Fire situations may cause an interruption of power. The system safeguards should be discussed with your local fire protection specialist.
• This device will not sense smoke unless the ventilation system is operating and the cover is installed.
• For this detector to function properly, it MUST be installed according to the instructions in this manual. Furthermore, the detector MUST be operated within
• ALL electrical and environmental specifications listed in this manual. Failure to comply with these requirements may prevent the detector from activating when smoke is present in the air duct.

General Description

• Smoke introduced into the air duct system will be distributed throughout the entire building. Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.
• Model D2 Duct Smoke Detector utilizes photoelectric technology for the detection of smoke. This detection method, when combined with an efficient housing design, samples air passing through the duct allowing detection of a developing hazardous condition. When sufficient smoke is sensed, an alarm signal is initiated and appropriate action can be taken to shut off fans, blowers, change over air handling systems, etc. These actions can facilitate the management of toxic smoke and fire gases throughout the areas served by the duct system

DETECTOR FEATURE SET

• Utilizes 2151 plug-in head
• Sampling tubes installed from front or rear
• Compatible with existing accessories

Contents Of The Duct Smoke Detector Kit

• Sensor/power board assembly and covers
• Three #10 sheet metal screws for mounting
• One test magnet
• Drilling template
• One sampling tube end cap
• One plastic exhaust tube

NOTE: A sampling tube must be ordered to complete the installation. It must be the correct length for the width of the duct where it will be installed. See Table 1 on page 3 to determine the inlet tube required for different duct widths

Detector Installation

Verify Duct Air Flow Direction And Velocity

Model D2 detectors are designed to be used in air handling systems having air velocities of 100 to 4000 feet per minute. Duct widths from 6 inches to 12 feet can be accommodated. Be sure to check engineering specifications to ensure that the air velocity in the duct falls within these parameters. If necessary, use a velocity meter (anemometer) to check the air velocity in the duct.

Determine Mounting location and Configuration

On ducts wider than 18 inches, it is recommended that the detector be mounted downstream of a bend, obstruction in the duct, or the supply or return air inlet.
Exception: Installation of duct detectors can be on or within a commercial packaged rooftop heating and air-conditioning system, fire/smoke dampers, and economizers. They may be mounted in either the supply and/or return air section as determined by local code.
Once a suitable location is selected, determine if the detector is to be mounted in a side-by-side “rectangular” configuration or a top-over-bottom “square” configuration as shown in Figure 2. If mounting in the square configuration, remove the rear attachment screw, rotate the unit at the hinge, and replace the screw with the new attachment hole as shown in Figure 2. Do NOT remove the hinge screw during this process. Final installation approval shall be based upon passing section 10.4.2 and 10.4.4 tests.

Drill the Mounting Holes

Remove the paper backing from the mounting template supplied. Affix the template to the duct at the desired mounting location. Make sure the template lies flat and smooth on the duct.

For rectan gular side-by-side mounting configuration :

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for the rectangular configuration mounting tabs as shown on the mounting template. Drill pilot holes at target “A” centers and cut two 1.375-inch diameter holes using a 13/8-inch hole saw or punch. Drill .156-inch diameter holes using a 5/32” inch drill at target “B” centers.

For square top-over-bottom mounting configuration :

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C” for the square configuration mounting tabs as shown on the mounting template. Drill pilot holes at target “A” centers and cut two 1.375-inch diameter holes using a 13/8” inch hole saw or punch. Drill .156-inch diameter holes using a 5/32-inch drill at target “C” centers. If desired, drill an additional .156-inch hole at the location of one of the mounting tabs on the lower housing.

Secure the Duct Detector to the Duct
Use two (rectangular configuration) or three (square configuration) of the provided sheet metal screws to screw the duct detector to the duct.
CAUTION : Do not overtighten the screws.

Sampling Tube Installation

Sampling Tube Selection

The sampling tube must be purchased separately. Order the correct length, as specified in Table 1, for width of the duct where it will be installed. It is recommended that the sampling tube length extend at least 2/3 across the duct width for optimal performance.

Must extend a minimum of 2/3 the duct width

The sampling tube is always installed with the air inlet holes facing into the airflow. To assist with proper installation, the tube’s connector is marked with an arrow. Make sure the sampling tube is mounted so that the arrow points into the airflow as shown in Figure 3. Mounting the detector housing in a vertical orientation is acceptable provided that the air flows directly into the sampling tube holes as indicated in Figure 3. The sampling tube and exhaust tube can be mounted in either housing connection as long as the exhaust tube is mounted downstream from the sampling tube.

CAUTION : The sampling tube end cap, included with the detector, is critical to proper operation of the duct smoke detector. The end cap is needed to create the proper air flow to the sensor of the duct smoke detector. Once any sampling tube length adjustments are made, plug the end of the sampling tube with the provided end cap.
A plastic exhaust tube is included with the unit to be installed if needed. Install into the housing connection that is downstream from the sampling tube connection. The exhaust tube can be installed from the front of the detector or the back. A longer 1-foot exhaust tube, model ETX is available as an accessory in cases where the molded exhaust tube does not extend at least 2 inches into the duct.

Sampling Tube Installation

• For tubes shorter than the width of the duct, slide the sampling tube, with the installed end cap, into the housing connection that meets the airflow first. Position the tube so that the arrow points into the airflow as shown in Figure 3. Per NFPA sampling tubes over 3 feet long should be supported at the end opposite of the duct detector. In ducts wider than 8 feet, work must be performed inside the duct to couple the other section of the sampling tube to the section already installed using the 1/2-inch conduit fitting supplied. Make sure that the holes on both sections of the air inlet sampling tube are lined up and facing the airflow.
• For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. Drill a 3/4 inch hole in the duct opposite the hole already cut for the sampling tube. Ensure that the sampling tube is angled downward from the duct smoke detector to allow for moisture drainage away from the detector. The sampling tube should be angled at least 1/4” downward for every 12” of duct width per Figure 4

There should be 10 to 12 holes spaced as evenly as possible across the width of the duct. If there are more than 2 holes in the section of the tube extending out of the duct, select a shorter tube using Table 1. Otherwise, trim the tube to leave approximately 1-2 inches extending outside the duct. Plug the 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: 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 to 11⁄4 inch hole where the flange will be used.

Modifications of Sampling Tubes

There may be applications where duct widths are not what is specified for the installation. In such cases, it is permissible to modify a sampling tube that is longer than necessary to span the duct width.
Use a 0.193 inch diameter (#10) drill and add the appropriate number of holes so that the total number of holes exposed to the air flow in the duct is 10 to 12. Space the additional holes as evenly as possible over the length of the tube.
NOTE : This procedure should only be used as a temporary fix. It is not intended as a permanent substitute for ordering the correct length tubes.

Remote Sampling Tube Installation

The detector arrangement can also incorporate the remote mounting of the sampling tube and/or exhaust tube. In this case both the detector, sampling tube and exhaust tube (if included) should be rigidly mounted to withstand the pressure and vibrations caused by the air velocity. The location of the detector’s sampling tube should be such that there is uniform airflow in the cross section area.
The pressure differential across the sampling and exhaust ports in the detector housing shall be verified to be between .01 and 1.11 inches of water. Do so by measuring the pressure difference between the inlet and outlet ports on the detector housing using a manometer as described in Section 10.4.4 of this manual.

Measurement Tests

Air Flow

The D2 is designed to operate over an extended air speed range of 100 to 4000 FPM. To verify sufficient sampling of ducted air, turn the air handler on and use a manometer to measure the differential pressure between the two sampling tubes. The differential pressure should measure at least 0.01 inches of water and no more than 1.11 inches of water. Because most commercially available manometers cannot accurately measure very low pressure differentials, applications with less than 500 FPM of duct air speed may require one of the following: 1) the use of a current-sourcing pressure transmitter (Dwyer Series 607) per Section 7.2; or 2) the use of aerosol smoke per section 10.4.4.

Low Flow Air Flow Test using Dwyer Series 607 Differential Pressure Transmitter

Verify the air speed of the duct using an anemometer. Air speed must be at least 100 FPM. Wire the Dwyer transmitter as shown in Figure 5. Connect the leads of the meter to either side of the 1000Ω resistor. Allow unit to warm up for 15 seconds. With both HIGH and LOW pressure ports open to ambient air, measure and record the voltage drop across the 1000Ω resistor (measurement 1), 4.00 volts is typical. Using flexible tubing and rubber stoppers, connect the HIGH side of the transmitter to the sampling tube of the duct smoke detector housing, and the LOW side of the transmitter to the exhaust tube of the duct smoke detector housing. Measure and record the voltage drop across the 1000Ω resistor (measurement 2). Subtract the voltage recorded in measurement 1 from the voltage recorded in measurement 2. If the difference is greater than 0.15 volts, there is enough air flow through the duct smoke detector for proper operation.

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. For signal wiring, (the wiring between interconnected detectors or from detectors to auxiliary devices), it is recommended that a single conductor wire be no smaller than 18 gauge. The duct smoke detector terminals accommodate wire sizes up to 12 gauge.
Smoke detectors and alarm system control panels have specifications for allowable loop resistance. Consult the control panel manufacturer’s specifications for the total loop resistance allowed for the particular model control panel being used before wiring the detector loop.

Wiring Instructions

The D2 detectors are designed for easy wiring. The housing provides a terminal strip with clamping plates. Wiring connections are made by sliding the bare end of the wire under the plate, and tightening the clamping plate screw. See Figure 6 below for system wiring.

DETECTOR STATUS INDICATION

Detector status is indicated by the LED’s on the sensor. Refer to table below for more details.

CAUTION
Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections

VERIFICATION OF OPERATION

POWER THE UNIT

Apply 12VDC or 24 VDC to terminals marked as + in and -, see Figure 1, and electrical specs for details.

PERFORM DETECTOR CHECK

VERIFY STANDBY per Table 2 on page 4. The use of a remote accessory is recommended.

Sensitivity Verification

1. The sensitivity of the sensor is confirmed to be operating within its allowable range each time the sensor LEDs blink red every 5 seconds. Note in a maintenance condition the sensor LEDs will not be illuminated as depicted in Table
2. The maintenance condition indicates that the sensor is operating outside its original factory preset sensitivity and shall be cleaned or replaced. See Section 9 for reference. This is a valid UL test. The SENS-RDR sensitivity reader can also be used to measure the sensitivity of the sensor. Sensitivity testing shall not be used as a substitute for alarm testing.

Duct Smoke Detector Test and Maintenance 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 zone or system under test to prevent unwanted alarms.

Alarm Tests

• M02-04-00 Magnet Test – Place the painted surface of the magnet onto the MAGNET TEST location on the sensor cover of unit (Figure 1). OR 1b. Remote Test Accessory – See list on page 1. The red LEDs on the sensor should latch on, as should any accessories (i.e. RA400Z, RTS451). Verify system control panel alarm status and control panel execution of all intended auxiliary functions (i.e. fan shutdown, damper control, etc.)
• The detector must be reset by the system control panel, or remote test accessory

VERIFY AIRFLOW TEST PER SECTION 7 HAS BEEN PERFORMED.

SMOKE RESPONSE TESTS

To determine if smoke is capable of entering the sensing chamber, visually identify any obstructions. Plug the exhaust and sampling tube holes to prevent ducted air from carrying smoke away from the detector head, then blow smoke such as cigarette, cotton wick, or punk directly at the head to cause an alarm. REMEMBER TO REMOVE THE PLUGS AFTER THIS TEST, OR THE DETECTOR WILL NOT FUNCTION PROPERLY.

SMOKE ENTRY USING AEROSOL SMOKE

This test is intended for low-flow systems (100-500 FPM). If the airspeed is greater than 500 FPM, use a conventional manometer to measure differential pressure between the sampling tubes, as described in 7.1.
Drill a 1⁄4 inch hole 3 feet upstream from the duct smoke detector. With the air handler on, measure the air velocity with an anemometer. Air speed must be at least 100 FPM. Spray aerosol smoke* into the duct through the 1⁄4 inch hole for five seconds. Wait two minutes for the duct smoke detector to alarm. If the duct smoke detector alarms, air is flowing through the detector. Remove the duct smoke detector cover and blow out the residual aerosol smoke from the chamber and reset the duct smoke detector. Use duct tape to seal the aerosol smoke entry hole.
Aerosol smoke can be purchased from Home Safeguard Industries, model 25S Smoke Detector Tester, Malibu, CA. Phone: 310/457-5813 and Chekkit Smoke Detector Tester model CHEK02 and CHEK06 available from SDi. When used properly, the canned smoke agent will cause the smoke detector to go into alarm. Refer to the manufacturer’s published instructions for proper use of the canned smoke agent.

CAUTION

Canned aerosol simulated smoke (canned smoke agent) formulas will vary by manufacturer. Misuse or overuse to these products may have long term adverse effects on the smoke detector. Consult the canned smoke agent man-ufacturer’s published instructions for any further warnings or caution state-ments.

INSTALL THE COVER

Install the covers making sure that the cover fits into the base groove. Tighten the seven screws that are captured in the covers.
NOTE : Verify sensor cover gasket is properly seated on cover prior to cover installation

DETECTOR CLEANING PROCEDURES

Notify the proper authorities that the smoke detector system is undergoing maintenance, and that the system will temporarily be out of service. Disable the zone or system undergoing maintenance to prevent unwanted alarms and possible dispatch of the fire department.

DETECTOR SENSOR

1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover by pressing firmly on each of the four removal tabs that hold the cover in place. See Figure 7.
3. Vacuum the screen carefully without removing it. If further cleaning is required continue with Step 4, otherwise skip to Step 7.
4. Remove the chamber cover/screen assembly by pulling it straight out.
5. Use a vacuum cleaner or compressed air to remove dust and debris from the sensing chamber.
6. Reinstall the chamber cover/screen assembly by sliding the edge over the sensing chamber. Turn until it is firmly in place.
7. Replace the cover using the LEDs to align the cover and then gently pushing it until it locks into place.
8. Reinstall the detector.

REINSTALLATION

• Reinstall the detector in its housing.
• Restore system power.
• Perform Detector Check, Section [10.2].
• Notify the proper authorities testing has been completed and the smoke detector system is back in operation.

SENSOR REPLACEMENT

1. Remove the sensor head by rotating counterclockwise.
2. Pull gently to remove it.
3. To replace the sensor head, align the mounting features and rotate clock-wise into place.

OPTIONAL ACCESSORIES

The D2 duct smoke detector can be used with the RA400Z, RTS451, or RTS-451KEY remote test station.
FIGURE 8. WIRING DIAGRAMS FOR OPTIONAL ACCESSORIES:

RTS451/RTS451KEY REMOTE TEST STATION

The RTS451/RTS451KEY Remote Test Station facilitates test of the alarm capa- bility of the duct smoke detector as indicated in the RTS451/RTS451KEY man- ual. The D2 duct smoke detector must be reset by the system control panel. If a system control panel is used, the panel itself may also require testing.
To install the RTS451/RTS451KEY, connect the device as shown in Figure 10 on page 6; wire runs must be limited to 25 ohms or less per interconnecting wire.
NOTE : The use of a remote test station requires the installation of an acces-sory coil, part number DCOIL, sold separately. See Figure for reference .

• Install DCOIL in housing pocket insuring that arrow is pointing toward detector
• Install DCOIL mounting screw
• Connect each DCOIL lead to a Test Coil Terminal

NOTE: THE USE OF EITHER THE RTS451 OR RTS451KEY REQUIRES THE INSTALLATION OF AN ACCESSORY COIL, DCOIL, SOLD SEPARATELY. SEE FIGURE 9 ABOVE FOR REFERENCE.
Please refer to insert for the Limitations of Fire Alarm Systems

THREE-YEAR LIMITED WARRANTY

System Sensor warrants its enclosed product to be free from defects in materials and workmanship under normal use and service for a period of three years from date of manufacture. System Sensor makes no other express warranty for the enclosed product. No agent, representative, dealer, or employee of the Company has the authority to in-crease or alter the obligations or limitations of this Warranty. The Company’s obligation of this Warranty shall be limited to the replacement of any part of the product which is found to be defective in materials or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return Authorization number, send defective units postage prepaid to: System Sensor, Returns Department, RA 3825 Ohio Avenue, St. Charles, IL 60174. Please include a note describing the malfunction and suspected cause of failure. The Company shall not be obligated to replace units which are found to be defective because of damage, unreasonable use, modifications, or alterations occurring after the date of manufacture. In no case shall the Company be liable for any consequential or incidental damages for breach of this or any other Warranty, expressed or implied whatsoever, even if the loss or damage is caused by the Company’s negligence or fault. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
I56-3050-001R
©2008 System Sensor

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