Faraday 8840 User manual

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.
TECHNICALDATA
TABLE 1
AIR DUCT CONDITIONS
Temperature Range: 32OF (0OC) - 100OF (38OC) per UL268/268A
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.
INSTALLATION/WIRING INSTRUCTIONS
AIR DUCT DETECTOR
Models 8840 AND 8839*
FARADAY
*See Compatible Control Equipment Table on the last page.
P/N 315-095659FA-3
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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.
MOUNTING THE AIR DUCT HOUSING
Location on Duct System
Locate the air duct detector in the main supply duct, downstream from the
filters and positioned so as to operate reliably in case of smoke in any part
of the air stream. In instances where filters are capable of removing
smoke, install detectors both upstream and downstream from the filters.
The air duct detectors use sampling tubes which monitor the full width of
an air duct to overcome the limitations of spot-type smoke and heat detec-
tors in the duct. However, since stratification can occur in the air stream
after a long duct run, locate the detector after bends or inlets which create
turbu lence, and hence, a more homogeneous mixture of air. The detector
should, when possible, be located a minimum of six duct-widths downstream
from the source of the turbulence (See Figure 1). A 12 inch by 12 inch ac-
cess hole should be cut in the duct adjacent to the detector to permit
checking and cleaning of the sampling tubes, if necessary.
Figure 1
Typical Mounting of Duct
OUTLET
SAMPLING TUBE
INLET
SAMPLING TUBE
AT LEAST
SIX DUCT
WIDTHS
Locate the air duct detector in the air handling system, as shown in Figure
2 and in conformance with NFPA Pamphlet No. 90A, Air Conditioning
and Ventilating System and with NFPA 72 Detectors. (Both publications
are available from the National Fire Protection Association, Batterymarch
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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.
Wire or program the detectors into the system so that they automatically shut
down the blowers and operate dampers as required in the event of an alarm.
Figure 2
Recommended Locations in Duct Systems
Mounting of the Air Duct Housing (See Figure 3)
a. Affix the adhesive backed gaskets (Item 1) to the back of the detector
housing (2) so that the larger hole on the gasket lines up with the sam-
pling tube hole on the sampling chamber and the smaller hole lines up
with the housing mounting hole.
b. Affix the adhesive backed template (5) to the side of the ductwork.
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
11/2inch 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 hous-
ing to permit checking and cleaning of the sampling tubes. The ac-
cess hole must be covered and sealed when not in use.
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Figure 3
Exploded View
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Sampling Tube Selection
There are four standard lengths of inlet sampling tubes. To ensure accurate
airsampling,selecttheappropriatelengthanddeterminetheoutsidewidthof
the duct. Select the sampling tube nearest to, but greater than, the duct width
(Table 2). The outlet sampling tube for all ducts is a fixed length of 4 inches
(10.1 cm). Trim the inlet sampling tube at the job site as described below.
TABLE 2
SAMPLING TUBE SELECTION CHART
Sampling Tube Standard
Outside Duct Width Model No. Tube Length
1 ft 93/4in or less 8932 2 ft
1 ft 93/4in - 3 ft 33/4in 8933 3 ft 6 in
3 ft 33/4in - 6 ft 33/4in or less 8934 6 ft 6 in
6 ft 33/4in - 9 ft 93/4in or less 8935 10 ft
Greater than 9 ft 93/4in Consult factory
Note: Each model is manufactured with a different number and size of
sampling hole. Only the specific tube must be used for the specified
duct width.
Figure 4
Sampling Tube Orientation
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Trimming the Inlet Sampling Tube (See Figure 4)
a. Measure the outside width of the duct.
b. Add 2.25 inches to obtain proper length of tube.
Example: Outside width of duct 2 ft 6 in
Add 2.25 inches + 2.25 in
Length of sampling tube 2 ft 8.25 in
The length (2 ft 8.25 in) determines (Table 2 on page 5)
the model number of the appropriate sampling tube
(8933).
c. Measure the sampling tube, starting from the end with the four mount-
ing holes.
d. Trim tube to the correct length, remove all burrs, and insert a rubber
stopper (Figure 3, Item 9) in the tube.
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 hous-
ing. 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. Install the inlet tube (3) by inserting it through the air sampling chamber
as shown in Figure 3. Face sampling tube holes into the air stream
(Figure 4), and secure to the housing with 8/32 screws (12).
d. Install the outlet tube (4) by inserting it into the upper socket of the air
sampling chamber with the scarfed end facing downstream (See Figure
4). Secure the bracket to the housing with an 8/32 screw.
e. Make sure no sampling holes extend beyond the ductway, that the stop-
per (9) remains firmly in position, and that the duct hole is sealed around
the protruding sampling tube.
Air Duct Sampling Tube Pressure Measurement
The Faraday Pressure Differential Measuring device, Model 8883, should
be used to ensure that the sampling tube pressure differential is within the
specified limits (See TECHNICAL DATA). Qualified personnel should take
measurements in accordance with the 8883 Instructions, P/N 315-
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-
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Figure 5
Typical Connections for the 8840/8839
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Figure 6
Typical Connections for the 8840 in MPC-6000 Systems
NOTES: 1. The relay contacts are shown after a reset
pulse, which represents the non-alarm condition.
2. If the relay contacts are being used to control
120 VAC operated equipment, ensure that the conduit is properly attached to the internal metal ground strap, using the proper conduit locking nuts. Failure to provide proper grounding may result in fatal electrical shock and violation of national and local codes.
3. Refer to the 8717 Installation Instructions,
P/N315-033280FA.
4. Refer to the 8727W / 8727C Installation
Instructions,P/N315-033230FA.
TB 1
TB 2
TB 3
4321
5567891011 5567891011
8710 8710 8710
MODEL 8840 (SEE NOTE 3)
MODEL 8717
WITH RELAY MODULE
MODEL 8717
WITH RELAY MODULE
NOT
USED
TERMINAL BLOCK
WIRE NUT REQUIRED
NOT USED NOT USED
RELAY
BOARD
ALARM CONTACTS 125 VAC/24 VDC, 3A SEE NOTES 1 AND 2
ALARM CONTACTS 125 VAC/24 VDC, 3A SEE NOTES 1 AND 2
TO NEXT ADDRESSABLE DEVICE
OPTIONAL REMOTE ALARM INDICATOR MODEL 8727W OR 8727C (SEE NOTE 4)
ZONE WIRES SEE COMPATIBLE CONTROL EQUIPMENT TABLE
LINE 1 LINE 2
RED
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lation, Operation, and Maintenance Manual provided with every control
panel. Note any limitations on the number of detectors and restric-
tions on the use of remote devices permitted for each circuit.
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.The
8710 is a polarity insensitive detector. Devices should be interconnected as
shown in Figure 6 and wired to the loop. Line 1 and Line 2 can be either line
of the loop. Note any limitations on the number of detectors and re-
strictions on the use of remote devices permitted for each circuit.
WARNING: When replacing a detector with a defferent model, be aware
that existing detector accessories connected to the base or air duct hous-
ing that were compatible with the old detector may not be compatible with
the new detector. Always read the Installation Instructions accompanying
the detector to determine detector and accessory compatibility.
INSTALLATION OF SMOKE DETECTORS
CAUTION: Faraday Air Duct Detector Model 8839 is designed only for
use with the 8854 detector with the 8851 base adapter.
Faraday Air Duct Detector Model 8840 is designed only for
use with the 8854 and 8710 detectors with the 8851 base
adapter.
Installation of the 8851 Base Adapter
1. Install the 8851 adapter into the 8914 base.Align the notch in the outer
flange of the adapter to the raised surface on the outer ring of the base
(Refer to Figure 7).
2. Push the adapter into the base and rotate clockwise to engage the
electrical connections. The adapter will automatically stop and lock into
place.
Figure 7
Installing the 8851 to the 8914 Base
Installation/Removal of 8854/8710 Detector in Base Adapter
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To Install:
• Align detector with base and insert detector.
• Rotate detector counterclockwise while gently pressing on it until the de-
tector drops fully into base.
• Then rotate the detector clockwise until it stops and locks in place. Insert
optional locking screw (Order P/N 446371).
To Remove:
• Rotate the detector counterclockwise until stop is reached.
• Pull detector out of base.
Sensing Compartment Cover Installation
a. Install the cover gasket (Figure 3, 15) 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 cover (16).
c. Fasten the cover, using the No. 6 screws (17) provided. Tighten snugly,
but not so tightly as to warp the cover and cause air leakage around
the edges of the cover.
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:
• for smoke in its sensing chamber
• that its smoke sensitivity is within the range indicated on the nameplate
label
• that its critical smoke sensing electronics are operating.
Based on the results of these checks, the LED indicator flashes as follows:
Flash
Color Condition
Flash
Interval
(Seconds)
Green Normal supervisory operation.
Smoke sensitivity is within rated
limits. 7
Yellow
Detector requires service
(cleaning or repair) or is
operating beyond its
environmental specifications.
7-30
Red Alarm Steady
No
Flashes Detector is not powered, or requires repair. -
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TESTINGAND MAINTENANCE
To assure proper operation of the detector and control panel, it is required
that both the Sensitivity test and the Functional test be conducted.
Sensitivity Test
The 8854 monitors its smoke sensitivity automatically 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.
Perform a Sensitivity test on the 8710 by measuring the obscuration level
of the detector using the 8720 Programming Unit. This test is used to en-
sure the detector is within its listed and marked sensitivity range. Refer to
the 8720 Manual, P/N 315-033260FA, for additional instructions on apply-
ing the Sensitivities mode.
Functional Test
To test the detector and control panel for functional operation, use Test
Gas Model 8919. Follow the instructions on the gas canister label.
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 inlet sampling tube become restricted, the unit cannot receive a proper
air sample, and performance is impaired. It is recommended that the sam-
pling tubes be checked and cleaned periodically. The detector mainte-
nance program should consist of periodic cleaning of dust from the detec-
tor head by using a vacuum cleaner. For cleaning Model 8854, refer to the
related Installation Instructions.
The cleaning and test program is recommended for 6 month intervals, or
morefrequently, if needed, dependingontheindividualdetectorenvironment.
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. This can be done by removing the sealing plug from
the inlet sampling tube on the opposite side of the duct and blowing smoke
directly into the inlet tube. Check that the fire alarm system is activated.
CAUTION: If the fire alarm system is connected to a central station or
fire department, or has external devices such as fans, extin-
guishers, etc., connected, notify appropriate personnel and
disconnect the external devices until all tests are completed.
After testing, reset the system, reconnect the devices, and
notify the personnel that the system is operating again.
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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 Installation/Wiring
Compatibility Identifier Instructions
MPC-6000 P/N 315-447309-1
The detector model number is the compatibility identifier.
*Do not use 8839 or detector operated accessories with
CIDI-DD/DB or LW-400.
P/N 315-095659FA-3
8 Fernwood Road
Florham Park, New Jersey 07932
COMPATIBLE CONTROL EQUIPMENT
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