Faraday 8742 Installation Instructions Manual
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Faraday 8742, Air Duct Monitoring Housings Installation Instructions Models 8741, 8742 and 8743 P/N 315-049708FA-4 INTRODUCTION Models 8741, 8742 and 8743 are air duct monitoring hous- ings containing sampling tubes. When used with a compat- ible smoke detector, smoke and combustion products are detected for shutdown of the duct system and/or operation of supplementary equipment as provided by the system control panel. See the following chart for usage. ledoMsrotceteDelbitapmoCyaleR 14784588 , 0178 , 3178oN 24784588seY 34780178 , 3178seY FF FF F oror oror or compat compat compat compat compat ible control equipment,ible control equipment, ible co
Faraday 8742, P/N 315-049708FA-42 APPLICATION The 8741, 8742 and 8743 duct smoke detectors provide early detection of smoke and products of combustion present in air moving through an HVAC duct supply, return, or both. These devices are designed to prevent the recirculation of smoke in areas by the air handling system’s fans and blow- ers. Complete systems may be shut down in the event of smoke detection. For the correct installation of a duct smoke unit please refer to NFPA 72 (National Fire Alarm Code), NFPA 90A (Standard for Installation of Air Conditioni
Faraday 8742, 3 P/N 315-049708FA-4 Figure 2 Recommended Locations in Duct Systems RETURN AIR SUPPLY AIR AIR DUCT HOUSING AIR DUCT HOUSING DAMPER BLOWER FILTER PLENUM FRESH AIR INTAKE DAMPER TYPE A: CLOSED SYSTEM - NO EXHAUST D D TYPE B: PROVISION FOR EXHAUSTING SOME PERCENTAGE OF RETURN AIR RETURN AIR SUPPLY AIR AIR DUCT HOUSING AIR DUCT HOUSING DAMPER DAMPER BLOWER FILTER PLENUM FRESH AIR INTAKE DAMPER D D EXHAUST AIR OUTPUT DAMPER TYPE C: RETURN AIR UNDER POSITIVE PRESSURE FROM SEPARATE BLOWER EXHAUST AIR OUTPUT DAMPER
Faraday 8742, P/N 315-049708FA-44 2) To minimize the impact of air turbulence and stratification on performance, a duct smoke detector should be located as far as possible downstream from any obstruc- tion (i.e. deflector plates, elbows, dampers, etc.). In all situations, confirmation of velocity and pressure differen- tial within specifications is required. The pressure differential between the input sampling (high pressure) tube and outlet (low pressure) tube for the 8741, 8742 or 8743 duct smoke detector should be greater than 0.01 inches of water and less than 1.2 i
5 P/N 315-049708FA-4 punch (2) 1¼” (32mm) holes for input sampling and outlet tubes, using the template as a guide. Clean all holes. Sampling Tube Installation The 8741, 8742 and 8743 duct smoke detectors use a specially notched sampling tube, which may be ordered separately in one of four standard lengths. ST-10 For duct widths of 6" to 1.0’ ST-25 For duct widths of 1.0’ to 3.0
Faraday 8742, P/N 315-049708FA-46 1. Remove the cover from the housing. 2. Loosen the screw and rotate the tube retainer until the input tube is inserted and oriented properly. Ensure that the notched end of the tube is inside the housing and that the air input sampling tube is positioned so that the input holes are directly facing the airflow. 3. Once the tube is installed, rotate the retainer back into place and tighten screw. 4. Install the outlet tube in the remaining position. Once the tube is installed, rotate the ret
Faraday 8742, 7 P/N 315-049708FA-4 Wiring The 8741, 8742 and 8743 should be connected as shown in Figures 5 and 6. Note any limitations on the number of detectors and restrictions on the use of remote devices permitted for each circuit. The 8741 is used with the 8713 detector in the MPC-6000/ MPC-7000 System. The 8743 must be used for the relay version. Also, all optional accessories in the same loop must be compatible with the detector series being used. These devices should be interconnected as shown in Figure 6 and wired to the FDLC. (Refer to the FDLC Installation Instruc- tions, P/N 315-447360FA, or the MPC-6000/MPC-7000 Manual, P/N 315-447309, as applicable.) 8
P/N 315-049708FA-48 LOOP WIRES. SEE COMPATIBLE CONTROL EQUIPMENT TABLE. NO COM NC LOOP WIRES. SEE COMPATIBLE CONTROL EQUIPMENT TABLE. TO NEXT DETECTOR OR EOL DEVICE (1A) TO REMOTE DEVICE (6) CNTL + - (5) -+ + - ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 2 DEVICE REMOTE DEVICE LOOP - DEVICE LOOP + LOOP/REM - DEVICE CONTROL NOT USED LOOP/REM + MODEL 8741 TO NEXT DETECTOR OR EOL DEVICE + -
Faraday 8742, 9 P/N 315-049708FA-4 Figure 6 Typical Connections for the 8741 / 8743 Using 8710 and 8713 Detectors NOTES: 1. The relay contacts are shown after a reset pulse, which represents the non-alarm condition. 2. Refer to the 8727W / 8727C Installation Instructions, P/N 315-033230FA. 3. The green grounding screw in the wiring compartment of the air duct housing is not used. LINE 2 LINE 1 NOT USED LINE1OR2 TO REMOTE TB1 OTHER LINE TO REMOTE TB3 COM NO NC NO DEVICE LOOP OTHER LINE LINE 1OR2 RELAY ALARM COM NC COM NO NC TB2 (6 or 5) TB3 (5 or 6) TB1 (1A) TB1 TB1 TB1 MODEL 8741 MODEL 8743 MODEL 8743 8710 8713 OPTIONAL REMOTE ALARM INDICATOR
Faraday 8742, P/N 315-049708FA-410 TESTING Only qualified service personnel should test these units. To assure proper operation of the detector and control panel, both the Sensitivity and the Functional tests should be conducted. The minimum test schedule may be found in the current edition of NFPA 72 for installations in the U.S. Sensitivity Test The 8854 detector monitors its smoke sensitivity automati- cally and requires no test equipment. A green flash of the detector LED about every seven seconds indicates that the smoke sensitivity is within its listed limits. Th
Faraday 8742, 11 P/N 315-049708FA-4 Refer to the following Installation Instructions for additional information on testing each of these detectors: The 8710 and 8713 can also be tested individually using the 8720. Refer to the 8720 Manual, P/N 315-033260FA. MAINTENANCE The performance of the air duct detector unit may be adversely affected by dirt or foreign matter on the sampling tubes or detector. If the air holes in the input sampling tube become restricted, the unit cannot receive a proper air sample, and performance is impaired. It is recommended that the sampling tubes be checked and cleaned periodically. The detector m
Faraday 8742, COMPATIBLE CONTROL EQUIPMENT ELECTRICAL RATINGS FOR 8713 AND 8710 Electrical ratings are not provided here for these detectors. Guidance for detector loop loading, along with loop wire electrical specifications are provided in the applicable control unit instructions given in the above Compatible Control Equipment tables. Siemens Industry, Inc. Building Technologies Division Florham Park, NJ P/N 315-049708FA-4 ROTCETED4588GNISU2478DNA1478 tnempiuqEeludoM reifitnedIytilibitapmoC /noitallatsnIeludoM snoitcurtsnIgnir iW 5078)0007-CPM/0006-CPM(5-AF058430-513N/P 104-WL 3-AF799590-513N/P )104-WL(A4-EZWL 4-AF81
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