Installation Instructions

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INSTALLATION/WIRING INSTRUCTIONS

AIR DUCT DETECTOR MODELS 8898 AND 8834

INTRODUCTION

Faraday Detector Models 8898 and 8834 are self-contained air duct detectors designed for

installation in heating, ventilating, and air conditioning duct systems. These Detector

Models 8898 and 8834 can use ionization or photoelectric smoke detectors to signal the pres-

ence of combustion products in a duct system. (Refer to TECHNICAL DATA for information on

compatible detectors.)

In addition to the self-contained detection features of the 8898 and 8834, these air duct detec-

tors also can power and supervise the following configurations.

(1) two air duct detectors (Model 8930 or 8840) mounted on the exterior of the duct and em-

ploying sampling tubes to monitor the air in the duct, or

(2) two spot detectors (Model 8854) mounted on the interior wall of the air duct, or

(3) one each of the detectors listed in (1) and (2) above.

TECHNICAL DATA

Smoke Detector Compatibility: 8898 - Use Model 8904 or 8905 only

8834 - Use Model 8854

8930 (Satellite) - Use Model 8904 or 8905 only

8840 (Satellite) - Use Model 8854

Operation Voltage and Current: 120 VAC (50/60 Hz), .32A max

Alarm Relay: DPDT contacts, rated at 125 VAC/24 VDC, 3A Resistive

Trouble Relay: SPDT contacts, rated at 125 VAC/24 VDC, 2A Resistive

Smoke Detector Sensitivity: Factory set for air duct application—See detector

nameplate label

Alarm Indicator: LED on smoke detector displays steady red light through

air duct cover

Temperature Range: 32

F (0

C) to 100

F (37.8

C) per UL 268/268A

Altitude Range: 8898, using 8904 - Altitude range is 0 to 4000 feet

above sea level

8898, using 8905 - Altitude range is 3000 to 8000 feet

above sea level

8834, using 8854 - No altitude limitations; detectors

unaffected by altitude

Relative Humidity Range 0 to 93% (non-condensating) RH per UL 268/268A

Air Duct Velocity Range: 8898: 500 to 4000 ft/min

8834: 300 to 4000 ft/min

Sampling Tube Pressure 8898: 0.017 to 1.07 inches of water

Differential Range: 8834: 0.006 to 1.07 inches of water

CAUTION: These air duct detectors are designed for detection of products of combus-

tion in a duct system. They are not to be used for open area protection.

OPERATION

When the 8898/8834 (8898 or 8834) is in operation, a sample of air is drawn from the duct

and passed through the sampling chamber at low velocity by means of the inlet sampling

P/N 315-096274FA-1

Summary of content (8 pages)

PAGE 1
INSTALLATION/WIRING INSTRUCTIONS AIR DUCT DETECTOR MODELS 8898 AND 8834 INTRODUCTION Faraday Detector Models 8898 and 8834 are self-contained air duct detectors designed for installation in heating, ventilating, and air conditioning duct systems. These Detector Models 8898 and 8834 can use ionization or photoelectric smoke detectors to signal the presence of combustion products in a duct system. (Refer to TECHNICAL DATA for information on compatible detectors.
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tube. The air sample passes through the smoke detector mounted in the duct housing and is exhausted back into the duct via the outlet sampling tube. Standby Indication During normal operation the green Power LED on the power supply control board, located in the wiring compartment of the 8898/8834, is lit, indicating that AC power is being applied. The alarm and trouble relays are in non-alarm and non-trouble states during standby operation.
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Figure 2 Recommended Locations in Duct Systems Figure 3 Exploded View 3
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c. Drill the four 0.110 diameter holes with a No. 35 drill bit and cut or punch out two 7/8-inch diameter holes as indicated on the template. d. Attach the appropriate model housing to the air duct using two No. 10 1½ inch screws (6) and also using two No. 10 1-inch screws (7) with lockwashers (8). e. Cut a 12 inch by 12 inch access hole in the duct adjacent to the housing to permit checking and cleaning of the sampling tubes. The access hole must be covered and sealed when not in use.
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Installation of the Sampling Tubes a. Before installing the tubes, cut a 7/8-inch hole in the duct wall that is directly opposite the inlet sampling chamber hole in the detector housing. This will allow the inlet tube to protrude through the duct. b. Attach brackets (10) to the inlet and outlet air sampling tubes with 3/16 screws (11). NOTE: When attaching brackets, be sure to align tubes properly (See Figure 4). c.
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that it is properly connected to the internal metal ground strap, using the proper conduit locking nuts. Failure to provide proper grounding may result in fatal electrical shock. 7. Connect EOL device (1.3K, 1/2W resistor) to terminals 3 and 4 of TB1 when no external detectors are connected. 8. When the relay contacts are connected to a fire alarm system, the trouble contacts must be wired beyond the last detector so as not to interfere with an alarm, as shown in Figure 7. 9.
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Typical Fire Alarm System Interface The Model 8898/8834 can be wired to interface to a fire alarm system as shown in Figure 7. The connections to the alarm relay (NO) contacts can be made between terminals 9 and 10 or 12 and 13. The connections to the trouble relay (NC) contacts can be made between terminals 7 and 8. NOTES: 1. All relay contacts are shown with 8898/8834 powered bv 120 VAC and in normal supervisory, no alarm, condition. 2.
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Sensing Compartment Cover Installation a. Install the cover gasket (Figure 3, 16) on the housing, if not already installed. Be certain the alignment holes in the cover gasket are aligned with the guides on the housing. b. Install the sensing compartment ionization cover (20) when using 8904 or 8905 detector and the photoelectric cover (17) when using an 8854 detector. c. Fasten the cover, using the No. 6 screws (18) provided.