Installation Instructions

ManualsBrandsSiemens ManualsFire - Detectors & Peripherals8701 Contact Monitoring Module, Installation Instructions

Air Duct Monitoring Housings

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.

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TECHNICAL DATA AIR DUCT CONDITIONS

Temperature Range:

F (0

C) - 100

F (38

C) per UL 268/268A

Altitude Range:

8741, 8742 and 8743 — No altitude limitations

Relative Humidity Range:

10-85% (non-condensing/non-freezing)

Air Duct Velocity Range:

100-4000 ft/min – 8741, 8742 and 8743

Sampling Tube Pressure Range of Differences:

Greater than 0.01 and less than 1.2 inches of water column

These air duct detectors are designed for detection and

control of products of combustion in a duct system.

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are not to be used for

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DO NOT USE air duct detectors with Alarm Verification.

Summary of content (12 pages)

PAGE 1
Installation Instructions Models 8741, 8742 and 8743 Air Duct Monitoring Housings INTRODUCTION Models 8741, 8742 and 8743 are air duct monitoring housings containing sampling tubes. When used with a compatible 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.
PAGE 2
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 blowers. Complete systems may be shut down in the event of smoke detection.
PAGE 3
TYPE A: CLOSED SYSTEM - NO EXHAUST C L FRESH AIR INTAKE OUTLET TUBE FILTER INPUT SAMPLING TUBE BLOWER DAMPER DAMPER RETURN AIR D SUPPLY AIR D PLENUM AIR DUCT HOUSING AIR DUCT HOUSING TYPE B: PROVISION FOR EXHAUSTING SOME PERCENTAGE OF RETURN AIR CENTER LINE OF DUCT FRESH AIR INTAKE EXHAUST AIR OUTPUT DAMPER RETURN AIR D AIR DUCT HOUSING Figure 1 Typical Mounting of Duct Housing DAMPER FILTER BLOWER DAMPER SUPPLY AIR D PLENUM DAMPER AIR DUCT HOUSING TYPE C: RETURN AIR UNDER POSITIVE
PAGE 4
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 obstruction (i.e. deflector plates, elbows, dampers, etc.). In all situations, confirmation of velocity and pressure differential 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.
PAGE 5
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 ST-25 ST-50 ST-100* For duct widths of 6" to 1.0’ For duct widths of 1.0’ to 3.0’ For duct widths of 3.0’ to 5.0’ (requires support) For duct widths of 5.0’ to 10.
PAGE 6
Mounting 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.
PAGE 7
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.
PAGE 8
REMOTE CONTROL - 8 + TB1 INSTRUCTIONS FOR WIRING DETAILS: INSTALLATION INSTRUCTIONS P/N 315-094925FA P/N 315-094926FA TO NEXT DETECTOR OR EOL DEVICE Figure 5 Typical Connections for the 8741 / 8742 Using 8854 Detectors DEVICE 8845, 8849 8844, 8848 (1A) TO REMOTE DEVICE (5) - NOT USED - + CNTL (6) DEVICE LOOP/REM + DEVICE LOOP/REM+ † SEE REMOTE DEVICE LOOP WIRES. SEE COMPATIBLE CONTROL EQUIPMENT TABLE.
PAGE 9
OTHER LINE TO REMOTE TB2 TB1 ALARM RELAY NO COM NC TB1 NC NO COM ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 1 DEVICE LOOP OTHER LINE LINE 1 OR 2 ALARM RELAY NO COM NC 8710 8713 8710 8713 DEVICE LOOP OTHER LINE LINE 1 OR 2 MODEL 8743 MODEL 8743 Figure 6 Typical Connections for the 8741 / 8743 Using 8710 and 8713 Detectors OPTIONAL REMOTE ALARM INDICATOR MODEL 8727C OR 8727W SEE NOTE 2 TO REMOTE TB3 LINE 2 TB3 (5 or 6) TB1 TB2 (1A) (6 or 5) LINE 1 OR 2 LOOP WIRES.
PAGE 10
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 automatically and requires no test equipment.
PAGE 11
Refer to the following Installation Instructions for additional information on testing each of these detectors: TABLE A Installation Detector Instruction 8854 315-094198FA 8713 315-033290FA 8710 315-033290FA 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.
PAGE 12
COMPATIBLE CONTROL EQUIPMENT 8741 AND 8742 USING 8854 DET ECT OR Module Equipment Module Installation/ Wiring Instructions Compatibility Identifier 8705 (MPC-6000/MPC-7000) P/N 315-034850FA-5 LW-401 P/N 315-095997FA-3 LWZE-4A (LW-401) P/N 315-096018FA-4 LWZE-8A (LW-401) P/N 315-096022FA-3 8741 AND 8743 USING 8710 OR 8713 DET ECT OR Module Equipment Module Installation/ Compatibility Identifier Wiring Instructions FDLC (MPC-6000/MPC-7000) P/N 315-447309-6 The detector model number is the compatibility iden