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INSTALLATION/WIRING INSTRUCTIONS
INTRODUCTION
Faraday Detector Models 8840 and 8839 are System LW-400, System
LW-401, System LW-450, System LW-500 and MPC-600 compatible air
duct detectors. They are designed for use in heating, ventilating, and air
conditioning duct systems to detect the presence of combustion products
in a duct system. (Refer to TECHNICAL DATA below for air duct operating
conditions.)
When smoke or combustion products are detected, shutdown of the duct
system and/or operation of supplementary equipment is provided by the
related system control panel with the 8840.
TECHNICAL DATA
Temperature Range: 32
Altitude Range: 8840 and 8839 — No altitude limitations
Relative Humidity Range: 0-93% (non-condensating) per UL 268-268A
Air Duct Velocity Range: 300-4000 ft/min – 8840 and 8839
Sampling Tube Pressure Range of Differences:
.01-1.0 inches of water column
CAUTION: These air duct detectors are designed for detection and con-
trol of products of combustion in a duct system. They are not
to be used for open area protection.
DO NOT USE air duct detectors with Alarm Verification.
*See Compatible Control Equipment Table on the last page.
FARADAY
AIR DUCT DETECTOR
Models 8840 AND 8839*
TABLE 1
AIR DUCT CONDITIONS
O
O
F (0
C) - 100
firealarmresources.com
O
O
F (38
C) per UL 268/268A
P/N 315-095659FA-3
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Summary of Contents for Faraday 8840
- Page 1 AIR DUCT DETECTOR Models 8840 AND 8839* INTRODUCTION Faraday Detector Models 8840 and 8839 are System LW-400, System LW-401, System LW-450, System LW-500 and MPC-600 compatible air duct detectors. They are designed for use in heating, ventilating, and air conditioning duct systems to detect the presence of combustion products in a duct system.
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Page 2: Operation
OPERATION When the 8840/8839 (8840 or 8839) is operating, a sample of air is drawn from the duct and passed through the sampling chamber by means of the inlet sampling tube. The air sample passes through the smoke detector mounted in the duct housing and is exhausted back into the duct through the outlet sampling tube. - Page 3 Park, Quincy, Massachusetts.) The detector on the return air side of the blower should be located at a point prior to exhausting air from the building or diluting return air with outside air. The detector on the supply air side of the blower should be downstream of the blower.
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- Page 5 Sampling Tube Selection There are four standard lengths of inlet sampling tubes. To ensure accurate air sampling, select the appropriate length and determine the outside width of the duct. Select the sampling tube nearest to, but greater than, the duct width (Table 2).
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Page 6: Electrical Wiring
085535FA. ELECTRICAL WIRING The 8840/8839 should be connected as shown in Figures 5 and 6. Follow the control panel wiring connection drawing installed on the inside face of each control panel cover. Duplicate wiring information is also in the Instal-... - Page 7 firealarmresources.com...
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- Page 9 When the 8840 is used with the 8710 detector in the MPC-6000 System, the 8717 MUST be used for the relay version in the same loop. Also all op- tional accessories in the same loop MUST be MPC-6000 accessories.
- Page 10 LED Indicator Operation The 8840 contains an LED indicator capable of flashing either one of three distinct colors: green, yellow, or red. Every seven seconds, the microproces- sor based detector checks the following: •...
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Page 11: Testing And Maintenance
CAUTION: Under no circumstances is the detector portion of the unit to be disassembled by anyone other than an authorized Fara- day Systems Technician. For service, contact your nearest authorized Faraday Service Representative. Periodic Testing The unit should be tested per NFPA 70 recommendations to ensure opti- mum performance. - Page 12 COMPATIBLE CONTROL EQUIPMENT 8839 AND 8840 USING 8854 DETECTOR Equipment Installation/Wiring Compatibility Identifier Instructions *CIDI-DD/DB (LW-500) P/N 315-079626FA-9 LW-450 P/N 315-094131FA-2 *LW-400 P/N 315-092538FA-11 LW-401 P/N 315-095998FA-2 *LWZE-4 (LW-400) P/N 315-092430FA-4 LWZE-4A (LW-401) P/N 315-096018FA-2 8840 USING 8710 DETECTOR Equipment...