System Sensor Duct Detector Testing and Maintenance

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InnovairFlex Testing and Maintenance Smoke Detector Testing Maintenance Guide and maintenance is important to any duct smoke detector application document will provide details on proper duct smoke detector testing and as well as NFPA recommendations Recommendations System Sensor strongly recommends that the user read NFPA Standards 90A and 101 The D4120 Air Duct Smoke Detectors are listed per UL 268A Per NFPA it is recommended that duct smoke detectors be visually inspected a year and functionally tested once a year Testing The D4120 is designed to operate over an extended air speed range of 100 4000 FPM To verify sufficient sampling of ducted air turn the air handler and use a manometer to measure the differential pressure between the sampling tubes The differential pressure should measure between 0.01 1.11 inches of water Most commercially available manometers cannot measure pressure differentials with less than 500 FPM of air These applications may require one of the following 1 the use of a pressure transmitter or 2 the use of aerosol smoke Low Flow Air Flow Test Using Dwyer Series 607 Pressure Transmitter Verify the air speed of the duct using an anemometer Air speed must be at least 100 FPM Using Dwyer Series 607 connect the leads of the meter to either side of the1000 resistor Allow unit to warm up for 15 seconds With both HIGH and LOW pressure ports open ambient air measure and record the voltage drop the 1000 resistor measurement 1 4.00 volts is typical Using flexible tubing and rubber stoppers connect the HIGH side of the to the sampling tube of the duct smoke detector housing and LOW side of the transmitter to the exhaust tube of the duct smoke housing Measure and record the voltage drop across the 1000 resistor 2 Subtract the voltage recorded in measurement 1 from the voltage in measurement 2 If the difference is greater than 0.15 volts there is enough air flow through duct smoke detector for proper operation 12 12 Testing Procedures Procdeures Test Reset Button Press and hold the test button located on power board cover for at least 2 seconds M02 04 00 Magnet Test Place the painted surface of the onto the MAGNET TEST location on the sensor of unit Or use Remote Test Accessory including RTS151KEY RTS2 and RTS2 AOS During testing the red alarm LED on the sensor and the board should latch on as should any accessories RTS151 Verify system control panel alarm and control panel execution of all intended auxiliary The detector must be reset by the system control panel cover Test Reset button or remote accessory To reset using the Test Reset button on the power board simply press and release Response Tests To determine if smoke is capable of entering the sensing visually identify any obstructions Plug the exhaust sampling tube holes to prevent ducted air from carrying away from the detector head then blow smoke such cigarette cotton wick or punk directly at the head to an alarm Remember to remove the plugs after this or the detector will not function properly Entry Using Aerosol Smoke This test is intended for low flow systems 100 500 FPM If air speed is greater than 500 FPM use a conventional to measure differential pressure between the tubes as described in Section 7.1 Drill a inch hole 3 feet upstream from the duct smoke With the air handler on measure the air velocity an anemometer Air speed must be at least 100 FPM aerosol smoke into the duct through the inch for five seconds Wait two minutes for the duct smoke to alarm If the duct smoke detector alarms air flowing through the detector Remove the duct smoke cover and blow out the residual aerosol smoke from chamber and reset the duct smoke detector Use duct to seal the aerosol smoke entry hole Aerosol smoke can be purchased from Home Safeguard Industries at model 25S Smoke Detector Tester and Chekkit Detector Tester model CHEK02 and CHEK06 available from When used properly the canned smoke agent will cause the detector to go into alarm Refer to the manufacturer published for proper use of the canned smoke agent Canned aerosol simulated smoke canned smoke agent will vary by manufacturer Misuse or overuse to products may have long term ad verse effects on the detector Consult the canned smoke agent manufac published instructions for any further warnings or statements Notify the proper authorities that the smoke detector system undergoing maintenance and that the system will be out of service Disable the zone or system maintenance to prevent unwanted alarms and dispatch of the fire department Remove the sensor to be cleaned from the system Remove the sensor cover by pulling outward on each the four removal tabs that hold the cover in place Vacuum the screen carefully without removing it If further is required continue with Step 4 otherwise skip Step 7 Remove the chamber cover screen assembly by pulling straight out Use a vacuum cleaner or compressed air to remove dust debris from the sensing chamber Reinstall the chamber cover screen assembly by sliding edge over the sensing chamber Turn until it is firmly place Replace the cover using the holes for the LEDs for and then gently pushing it until it locks place Reinstall the detector Restore system power Perform Detector Check Notify the proper authorities testing has been completed the smoke detector system is back in operation Note If any unitary packaged air conditioning units are run during drywall installation phase of any building under construction to the drying of joint compound the subsequent sanding those drywall joints and resulting dust may compromise the heads in duct smoke detectors To avoid this condition it recommended that the sensor heads be removed during the phase System Sensor HVFL18401 12 12

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