System Sensor DH100LP Smoke Alarm User Manual
Contents
1. A78 2697 00 156 0083 07R The trouble condition can be caused inten tionally to verify correct operation of the sys tem Remove the detector board to cause a trouble condition locally and at the system control panel Test 6 2 2 Alarm Tests 6 2 2 1 M02 04 00 Magnet Test 1 Place the painted surface of the magnet onto the TEST locator on the bottom of the housing Figure 9 2 The red alarm LEDs on the detector 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 3 The detector must be reset by the system control panel the local reset button or the remote accessory Figure 10 Testing detector alarm 6 2 2 2 RTS451 RTS451KEY Remote Test Station The RTS451 RTS451KEY Remote Test Station facilitates test of the alarm capability of the duct smoke detector as indicated in the RTS451 RTS451KEY manual The DH100LP duct smoke detector can be reset by the RTS451 RTS451 KEY 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 9 wire runs must be limited to 25 ohms or less per interconnecting wire 6 2 3 Sensitivity Tests 6 2 3 1 MOD400 or MOD400R Test After verification of alarm capability use the MOD4OOR test module with a voltmeter to check det2. cleaning or replacement depend ing 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 6 for more information Replacement filters can be ordered from System Sensor 3825 Ohio Ave St Charles IL 60174 Exhaust tube intake tube filter P N F36 09 11 5 6 Field Wiring Installation Guidelines All wiring must be installed in compliance with the National Electrical Code and the local codes having juris diction Proper wire gauges should be used The conduc tors 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 156 0083 07R For signal wiring the wiring between interconnected detectors or from detectors to auxiliary devices it is usu ally recommended that single conductor wire be no smaller than 18 gauge The duct smoke detector terminals accom modate 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 connections may be used if desired Smoke detectors and alarm system control panels have specifications for allowable loop resistance Consult the control panel manufacturer s spe
3. 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 sam pling tube to the other side of the duct When using the flange connector mounting technique drill a 1 to 14 inch hole where the flange will be used D200 15 00 5 4 3 Modifications of Sampling Tubes There may be applications where duct widths are not what is specified for the installation In such cases it is permis sible to modify a sampling tube that is longer than neces sary to span the duct width Use a 0 193 inch diameter 10 drill and add the appro priate 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 5 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 filter over the sampling tube Figure 6 Sampling tube filter installation Filters require periodic
4. 1 Detector Board Replacement part no A5180 1 Remove the two detector board mounting screws 2 Pull gently on the board to remove it 3 To replace the board align the board mounting features holes and the interconnect terminals Push the board into place 4 Secure board with the two mounting screws 8 2 Power Board replacement part no A5061 1 Disconnect wiring from the terminal block Remove the two power board mounting screws Pull gently on the board to remove it To replace the board align the board mounting features holes and the interconnect terminals Push the board into place 5 Secure board with the two mounting screws 6 Re connect wiring to terminal block BW N 156 0083 07R 9 Model DH100LP Air Duct Smoke Detector Specifications 32 to 131 F 22 to 158 F Operating Temperature Storage Temperature 0 to 55 C 30 to 70 C 0 5 to 20 3 m sec 36 5cm L x 14cm W x 7cm D Humidity 10 to 93 R H noncondensing Air Velocity 100 to 4000 ft min Dimensions 14 38 L x 5 5 W x 2 75 D Weight 3 25 pounds Electrical Ratings includes base and detector System Voltage 12 24 VDC Maximum Ripple Voltage 4 Volts peak to peak Start up Capacitance 0 02 pF maximum Standby Ratings 8 5 VDC minimum 35 VDC maximum 120 pA maximum Alarm Ratings 1 5 kg 4 2 VDC minimum at 10mA 6 6 VDC maximum at 130mA Alarm current must be limited to 130mA or less by th
5. 5 seconds With both HIGH and LOW pressure ports open to ambient air measure and record the voltage drop acrossthe 1000Q 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 156 0083 07R the duct smoke detector housing and the LOW side of the transmitter to the exhaust tube of the duct smoke detec tor housing Measure and record the voltage drop across the 1000Q 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 Figure 7 Procedure for verifying air flow la TO SAMPLING TUBE a TO EXHAUST TUBE Q Q QEY DIFFERENTIAL TRANSMITTER 15 TO 36VDC SUPPLY T evour BATTERY 9 VOLT BATTERY 1000 OHM 5 1 WATT RESISTOR 9 VOLT BATTERY VOLT METER FLUKE MODEL 87 OR EQUIVALENT e 6 1 5 Filter Replacement The filters do not substantially affect smoke performance even when up to 90 of the filter is clogged Quarterly visual inspection usually suffices to determine whether the filters should be replaced because only a high percentage of contamination affects performance If further testing is required compare differential pressure readings with and without the filters ins
6. 56 0083 07R 3 Figure 1 Exploded View Of Duct Detector Components FOAM GASKETS PLASTIC SAMPLING TUBE ier SELF TAPPING SCREW CONDUIT HOLES DETECTOR TERMINAL STRIP POWER BOARD COVER MOUNTING SCREWS DETECTOR BOARD DETECTOR COVER For this detector to function properly it MUST be installed according to the instructions in this manual Furthermore the detector MUST be protected from the elements and operated within ALL electrical and environmental specifi cations listed in this manual Failure to comply with these requirements may prevent the detector from activating when smoke is present in the air duct 4 Contents Of The Duct Smoke Detector Kit Complete housing base and cover assembly Two 10 x 114 sheet metal machine screws for mounting Two sampling tube filters One test magnet Drilling template Two foam gaskets Four 6 self tapping mounting screws for the metal sampling tube and optional exhaust tube extension 8 One sampling tube end cap 9 Metal sampling tube end plug 10 One plastic sampling tube 11 One 8 self tapping screw for the plastic sampling tube NOTE For ducts over 1 4 feet longer sampling tubes must be ordered to complete the installation They must be the correct length for the width of the duct where they will be installed See Table 1 on page 3 to determine the sampling tube required for differ ent duct widths SO Ee Ne 5 Installation Sequence 5 1 Ve
7. 8 feet is accomplished by using the ST 10 sampling tube If the tube is shorter than the width of the air duct install the end cap into the sampling tube as shown in Figure 4 and support the end opposite the duct smoke detector Install the sampling tube as follows 1 Drill a 34 inch hole in the duct opposite the hole already drilled for the sampling tube Drill the hole 1 to 2 below the inlet hole on the opposite side of the duct to allow for moisture drainage away from the detector 2 Slide the sampling tube with the flange into the housing bushing that meets the air flow first Position the tube so that the arrow points into the air flow Secure the tube flange to the housing bushing with two 6 self tapping screws 3 From inside the duct couple the other sections of the sampling tube to the section already installed using the 12 inch conduit fittings supplied Make sure that the holes on both of the air inlet tubes are lined up and fac ing into the air flow 4 Trim the end of the tube protruding through the duct so that 1 to 2 of the tube extend outside the duct Plug this end with the end cap and tape closed any holes in the protruding section of the tube Be sure to seal the duct when the tube protrudes 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
8. INSTALLATION AND MAINTENANCE INSTRUCTIONS Innoveir DH100LP Air Duct Smoke Detector with Extended Air Speed Range The Innovair DH100LP 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 has an opera tional temperature range of 32 F to 131 F 0 C to 55 C Before Installing Please thoroughly 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 or via System Sensor s toll free fax back service Documents on Demand at 800 736 7672 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 Table of Contents Page 1 General Description cccccccecessesseeeececceeeeeeeaaeees 1 2 Limitations of Duct Smoke Detectors cccseeeeeeees 1 3 Exploded View of Duct Smoke Detector Components 2 4 Contents of the Duct Smoke Detector Kit 0 2 5 Installation Sequence ccccccceseeseeeeeeeceeeeessssseeeeeees 2 6 Duct Smoke Detector Maintenance
9. and Test Procedures cccccccccceeeeceassseeeececeeeeeeasanes 5 7 Detector Cleaning Procedures 7 8 Board Replacement cccccccsssseeeeeeccceeseesssaeeeeeees 7 9 Specifications cceeeccccccccccecesseseeeeeccceeeesssaaeeeeees 8 Warrant yi kesre E aa hark ac deste eo eee eek 8 1 General Description An HVAC system supplies conditioned air to virtually every area of a building Smoke introduced into this 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 DH100LP Air Duct Smoke Detectors utilizes photo electric technology for the detection of smoke This detec tion method when combined with an efficient housing design samples air passing through the duct and allows detection of a developing hazardous condition When suf ficient smoke is sensed an alarm signal is initiated at the SYSTEM S9 SENSOR 3825 Ohio Avenue St Charles Illinois 60174 1 800 SENSOR2 FAX 630 377 6495 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 DH100LP detectors are designed to operate with 12 24VDC UL listed compatible 2 wire control panels Alarm current must be limited to 130mA or less by the control panel Auxiliary relay contacts for c
10. cifications for the total loop resistance allowed for the particular model control panel being used before wiring the detector loop Wiring Instructions The DH100LP detectors are designed for easy wiring The housing provides 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 The DH100LP duct smoke detector is designed to operate with 12 or 24 VDC UL listed 2 wire compatible control pan els Alarm current must be limited by the control panel to 100mA or less An example of a UL listed compatible con trol panel is the Fire Lite model Sensiscan 1000 using zone card ANC 2 and compatibility identification A Install per installation instruction 1000 801 A maximum of 20 detec tors may be installed per zone 5 7 Perform Detector Check 1 Perform STANDBY AND TROUBLE TEST per Section 6 2 1 2 Perform MAGNET TEST per Section 6 2 2 1 The RTS451 test of Section 6 2 2 2 may substitute for this requirement 3 Perform AIR FLOW TEST per Section 6 1 1 4 Perform SMOKE RESPONSE TEST per Section 6 1 2 5 Perform SENSITIVITY TEST per Section 6 2 3 5 8 Install The Cover Install the cover using the six screws that are captured in the housing cover Be certain filters are installed as speci fied in Section 5 5 Make sure that the cover fits into the base groov
11. e and that all gaskets are in their proper posi tions Tighten the six screws 6 Duct Smoke Detector Maintenance And Test 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 D200 15 00 service Disable the zone or system under test to prevent unwanted alarms 6 1 Smoke Entry Tests 6 1 1 Air Flow The DH100LP 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 sam pling tubes The differential pressure should measure at least 0 0015 inches of water and no more than 1 2 inches of water Because most commercially available manometers cannot accurately measure very low pressure differentials applica tions 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 6 1 4 or 2 the use of aerosol smoke per section 6 1 2 6 1 2 Air Flow Test using Aerosol Smoke This test is intended for low flow systems 100 S500FPM If the air speed is greater than 500FPM use a conventional manometer to measure d
12. e control panel If used the RA400Z remote lamp operates within the specified alarm currents 2 50 VDC minimum 0 3 Sec maximum 34 0 Sec maximum Reset Voltage Reset Time Start up Time Please refer to insert for the Limitations of Fire Alarm Systems Three Year Limited Warranty System Sensor warrants its enclosed air duct smoke detector to be free from defects in materials and workmanship under normal use and ser vice for a period of three years from date of manufacture System Sensor makes no other express warranty for this air duct smoke detector No agent representative dealer or employee of the Company has the author ity to increase or alter the obligations or limitations of this Warranty The Company s obligation of this Warranty shall be limited to the repair or replacement of any part of the air duct smoke detector 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 D200 15 00 2003 System Sensor Avenue St Charles IL 60174 Please include a note describing the mal function and suspected cause of failure The Company shall not be obli gated to repair or replace units which are found to be defective because o
13. ector sensitivity as indicated in the test module s manual The housing cover must be removed to perform this test D200 15 00 If test module readings indicate that the detector head is outside of the acceptable range that is printed on the label of the detector the detector requires cleaning per Section 7 of this manual 7 Detector Cleaning Procedures Notify the proper authorities that the smoke detector sys tem 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 7 1 Air Filters 1 Turn off power to the system 2 Remove and inspect sampling tube filters 3 If filters are heavily coated with dirt replace them with new filters If they are not heavily coated use a vacuum cleaner or compressed air nozzle to remove dust then reinstall the filters 7 2 Photo Detector Boards 1 Remove the screen by gently grasping on each side and pulling straight off 2 Lift the photo chamber in the same fashion Vacuum the screen and cover Use clean compressed air to loosen and blow out any remaining debris Replacement screens S08 39 01 are available 3 Vacuum photo chamber then use clean compressed air to blow area clean 4 Replace the chamber by pressing it onto the base Press the screen into place It should fit tightly on the chamber 8 0 Board Replacement 8
14. f 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 156 0083 07R
15. ifferential pressure between the sampling tubes as described in 6 1 1 Drill a 14 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 14 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 Malibu CA Phone 310 457 5813 6 1 3 Smoke Entry Test To determine if smoke is capable of entering the sens ing chamber visually identify any obstructions Plug the exhaust and inlet 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 6 1 4 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 transmit ter as shown in Figure 7 Connect the leads of the meter to either side of the 1000Q resistor Allow unit to warm up for 1
16. in a vertical ori entation is acceptable provided that the air flows directly into the sampling tube holes as indicated in Figure 4 Table 1 Sampling tubes recommended for different duct widths Outside Duct Width Sampling Tube Recommended 1 to 2 ft ST 1 5 2 to 4 ft ST 3 4 to 8 ft ST 5 8 to 12 ft ST 10 Must extend a minimum of 24 the duct width 5 4 1 Installation For Ducts Greater Than 1 Feet But Less Than 8 Feet Wide 1 If the tube is longer than the width of the air duct drill a 3 inch hole in the duct opposite the hole already cut for the sampling tube Make sure the hole is 1 to 2 below D200 15 00 the inlet hole on the opposite side of the duct to allow for moisture drainage If the tube is shorter than the width of the air duct install the end cap into the sampling tube as shown in Figure 4 Sampling tubes over 3 ft long must be supported at the end opposite the duct detector 2 Slide the tube into the housing bushing that meets the air flow first Position the tube so that the arrow points into the air flow 3 Secure the tube flange to the housing bushing with two 6 self tapping screws 4 For tubes longer than the width of the air duct the tube should extend out of the opposite side of the duct If there are more than 2 holes in the section of the tube extending out of the duct select a different length using Table 1 Otherwise trim the end of the tube protruding through the duct so that 1
17. ontrol purposes are not avail able for use with the DH100LP Control must initiate from the control panel For testing the alarm can be enabled by a magnet activated test switch or by the optional remote test station The duct smoke detector latches into alarm state when an alarm occurs A green LED flashes to indicate power a red LED signals local alarm indication and optional accessories offer a variety of annunciation capabilities The DH100LP can be reset by a momentary power interrup tion the reset button on the front cover the control panel or remote reset accessory 2 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 substi tute for early warning in a building s regular fire detection system System Sensor supports this position and strongly recom mends that the user read NFPA Standards 90A 72 and 101 The DH100LP 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 fire control panel monitoring the detector and appropriate D200 15 00 1
18. rify Duct Air Flow Direction And Velocity Model DHI100LP detectors are designed to be used in air handling systems having air velocities of 100 to 4000 feet per minute 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 anemom eter to check the air velocity in the duct D200 15 00 5 2 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 Center punch holes A and B Drill the holes as indicated on the template 5 2 1 Sampling Tube Installation for Ducts Less Than 1 Feet Wide see Figure 2 1 Remove the front cover 2 Slide the plastic sampling tube into the housing bushing 3 Align the holes in the bushing with the holes in the sam pling tube Make sure there are six exposed holes on the plastic sampling tube Secure with the 8 self tapping screw into the bottom hole of the permanent tube NOTE The sampling tube end cap is critical to the 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 NOTE For ducts greater than 1 2 feet in width refer to sections 5 4 1 and 5 4 2 Figure 2 Sampling tubes connected to duct smoke detector 156 0083 07R 5 3 Secure The De
19. talled If the difference exceeds 10 replace the filters In no case should the pressure differen tial fall below 0 0015 inches of water 6 2 Standby Alarm And Sensitivity Tests 6 2 1 Standby And Trouble Standby Look for the presence of the flashing green LED through the transparent housing cover The LED should flash approximately every 10 seconds If the Green LED does not flash then the de tector lacks power check wiring panel or power supply the detector board is missing replace or the unit is defective return for replacement Trouble Figure 8 System wiring diagram for 2 wire duct smoke detectors detectors powered from initiating circuit ACAUTION Do not loop wire under terminals when wiring detectors Break wire runs to provide system supervision of connections UL LISTED COMPATIBLE 2 WIRE CONTROL PANEL 1ST DETECTOR IN LOOP DH100LP r l DETECTOR BOARD el s RA400Z OPTIONAL REMOTE ALARM LED 28 VDC Nom IN ALARM LAST DETECTOR IN LOOP DH100LP r DETECTOR EOL RESISTOR l BOARD SPECIFIED BY PANEL MANUFACTURER lz a RA400Z OPTIONAL REMOTE ALARM LED 28 VDC Nom l IN ALARM A78 2696 00 Figure 9 Wiring diagram for the DH1LOOLP to RTS451 RTS451KEY D200 15 00 DH100LP RTS451 RTS451KEY Test O 5 J Test Test Reset Reset GH 3 RA OH O a Reset RA 2
20. tector Housing To The Duct Slide the foam gaskets over the tube bushings as shown in Figure 3 Use the two 1 4 long sheet metal screws to screw the detector housing to the duct CAUTION Do not overtighten the screws Figure 3 Installation of foam gaskets over sampling tube bushings R iy SCREW HOLES FOR ATTACHING HOUSING TO DUCT WORK H0107 00 5 4 Sampling Tube Installation of Ducts Greater Than 1 Feet Wide The sampling tube is identified by a series of air inlet holes on the tube One plastic tube is included for ducts up to 18 in width All other lengths 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 74 across the duct width for optimal performance The exhaust tube is molded onto the base of the duct housing and the A2440 00 Exhaust Tube Extension is available as an accessory in those cases where the molded exhaust port does not extend at least 2 inches into the duct The sampling tube is always installed with the air inlet holes facing into the air flow To assist proper installation the tube s mounting flange is marked with an arrow Make sure the sampling tube is mounted so that the arrow points into the air flow see Figure 4 Figure 5 shows the various combinations of tube mounting configurations with respect to air flow Mounting the detector housing
21. to 2 of the tube extend out side the duct Plug this end with the end cap and tape closed any holes in the protruding section of the tube Be sure to seal the duct when the tube protrudes NOTE The sampling tube end cap is critical to the 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 Figure 4 Air duct detector inlet sampling tube SAMPLING TUBE END CAP AIR FLOW DIRECTION MUST FACE INTO AIR FLOW HO0108 02 Figure 5 Tube mounting configurations with varying air flow direction DOTS INDICATE POSITION OF SAMPLING TUBE HOLES AIR FLOW GIRECTION DIRECTION DETECTOR DETECTOR HOUSING HOUSING B SAMPLING EXHAUST EXHAUST SAMPLING TUBE TUBE TUBE TUBE HORIZONTAL MOUNTING OF HOUSING DETECTOR HOUSING EXHAUST AIR FLOW TUBE AIR FLOW DIRECTION DIRECTION DETECTOR SAMPLING TUBE HOUSING c VERTICAL MOUNTING OF HOUSING HO0109 01 NOTE Only metal sampling tubes may be used on ori entations C and D 156 0083 07R In no case should more than 2 air inlet holes be cut off the tube There must be a minimum of 10 holes in the tube exposed to the air stream 5 4 2 Installation For Ducts More Than 8 Feet Wide NOTE To install sampling tubes in ducts more than 8 feet wide work must be performed inside the air duct Sampling of air in ducts wider than
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