INSTALLATION AND MAINTENANCE INSTRUCTIONS
Power 120 VAC (102 - 132) 240 VAC (204 - 264) 24 VAC (20.6 - 26.4)
24 VDC (20 - 30)
Requirements mA rms MAX. mA rms MAX. mA rms MAX.
mA DC MAX.
Device
Standby Alarm Standby Alarm Standby
Alarm Standby Alarm
DH500ACDC
44 52 25
30
65
182 26 87
PA400*
-- 3 --
1.5
--
29 -- 15
RA400ZA*
-- 1.5 --
1 -- 17.3 -- 10
RTS451/RTS451KEY*
-- 1.5 --
1 -- 17.3 -- 10
RTS451**/RTS451KEY
11.5 13 5.5
6.5 140 157 95 103
DH500ACDC Intelligent Air Duct
3825 Ohio Avenue, St. Charles, Illinois 60174
Smoke Detector Housing
Specifications
Length: 14.5 inches (36.7 cm.)
Width: 5 inches (12.7 cm.)
Depth: 4 inches (10.2 cm.)
Weight: 4 lbs. (1.8 kg.)
Operating Temperature Range: 32° to 120°F (0° to 49°C)
Operating Humidity Range: 10% to 93% Relative Humidity
Duct Air Velocity: 500 – 4000 ft./min. (91.4 – 1219.2 m/min.
Power Supply Electrical Ratings For DH500ACDC
The currents shown for the DH500ACDC are maximum values with no accessories.
* All accessory currents are additional to DH500ACDC. There are no additional currents for accessories in standby.
** RTS451/RTS451KEY when the magnet is held in place to initiate an alarm.
24V output maximum load is 80 mA; auxiliary alarm output maximum load is 20 mA.
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
Auxiliary Relay Contacts
Minimum contact current must be greater than 500 mA at 24 VDC
10 amps maximum at 30 VDC
10 amps maximum at 250 VAC
Before Installing
Please thoroughly read the System Sensor Manual I56473-XX, Guide for Proper Use of Smoke Detectors in Duct
Applications, which provides detailed information on
detector spacing, placement, zoning, wiring, and special
applications. Copies of this manual are available at no
charge from System Sensor. NFPA Standards 72 and 90A
should also be referenced for detailed information.
NOTICE: This manual should be left with the owner/user
of this equipment.
IMPORTANT: This detector must be tested and maintained
regularly following NFPA 72 requirements. The detector
should be cleaned at least once a year.
D500-07-00 1 I56-432-11R
General Description
An HVAC system supplies conditioned air to virtually every
area of a building. Smoke introduced into this air duct system will be distributed to the entire building. Smoke detectors designed for use in air duct systems are used to sense
the presence of smoke in the duct.
The DH500ACDC Air Duct Detector Housings are used with
System Sensor’s Model 1551 ionization detector heads and
Model 2551 photoelectronic detector heads (purchased separately). These two smoke detection methods are combined
with an efficient housing design that samples air passing
through a duct and allows detection of a developing hazardous condition. When sufficient smoke is sensed, an alarm
signal is initiated at the fire control panel monitoring the
detector, and appropriate action can be taken to shut off
fans and blowers, change over air handling systems, etc.
This can prevent the distribution of toxic smoke and fire
gases throughout the areas served by the duct system.
Figure 1:
SAMPLING TUBE
FILTERS
CONDUIT HOLES
DUCT DETECTOR
HOUSING
PC BOARD
INSULATOR
DUCT DETECTOR
COVER
SAMPLING TUBE
MOUNTING
SCREWS
DETECTOR HEAD
(SUPPLIED SEPARATELY)
EXHAUST
FILTER ADAPTER
DETECTOR BASE
INLET SAMPLING TUBE
(SUPPLIED SEPARATELY)
O-RINGS
FOAM
GASKETS
HOUSING
MOUNTING SCREWS
TEST MAGNET
TUBE
END
PLUG
See Note 1 below for inlet
sampling tube and detector
supply information.
H0309-00
The DH500ACDCs are built to operate on 120/240 VAC or
24 VAC/DC. Two form-C (SPDT) relay contacts are available for control purposes. Two LEDs on each detector latch
on to provide a local alarm indication. Remote alarm indication is made possible by using the auxiliary alarm output
(see Figure 5). The duct detector can be tested and alarm
can be reset by using the correct respective code commands
from the panel. See panel instructions for details.
Installation Sequence Page
Step 1. Verify duct air flow direction and velocity ............2
Step 2. Drill the mounting holes .....................................2
Step 3. Mount duct housing ...........................................3
Step 4. Install the inlet tube ...........................................3
Step 5. Complete the field wiring....................................5
Step 6. Install the filters .................................................7
Step 7. Perform detector check .......................................7
Step 8. Install the cover .................................................9
Contents Of The Duct Detector Housing Kit
Step 9. Perform the final system check (Testing) .............9
The DH500ACDC Air Duct Detector Housings consist of the
following items: (See Figure 1.)
Step 1. Verify Duct Air Flow Direction And Velocity
The DH500ACDCA is designed to be used in air handling
systems having air velocities up to 500 feet per minute.
1. Complete housing base and cover assembly.
2. Two #10 sheet metal mounting screws.
3. Two sampling tube filters.
4. One test magnet.
5. Drilling template.
6. Two 5/16-inch O-rings.
7. Two foam gaskets.
8. Four #6 self-tapping mounting screws for the sampling
tube.
9. One filter adapter.
10. One inlet tube end plug.
11. Two #10 speed nuts.
NOTE: The inlet sampling tube must be ordered separately.
It must be the correct length for the width of the duct
D500-07-00 2 I56-432-11R
where it will be installed. See Table 1 to determine
the inlet tube required for different duct widths. A
smoke detector head (1551 ionization or 2551 for
photoelectronic) must be ordered separately.
Be sure to check engineering specifications to ensure that
the air velocity in the duct falls within these parameters.
If necessary, use a velocity meter to check the air velocity
in the duct.
Step 2. Drill The Mounting Holes
Remove the paper backing from the drilling template. Affix
the template to the air duct at the desired mounting loca-
tion. Make sure the template lies flat and smooth on the air
duct. Center punch hole targets and remove the template.
Drill the holes as indicated on the template. Slide the two
speed nuts over the two small holes (Hole A) next to the
sampling tube bushing holes (Hole B) previously drilled in
the duct. (See Figure 2.)
Location of detectors mounted in or on air ducts should
be at least six duct widths downstream from any duct
openings, deflection plates, sharp bends, or branch con-
nections.
HOLE B
HOLE A
DUCT
WALL
SPEED
NUT
Figure 2. Speed nut mounting location:
SCREW HOLES FOR ATTACHING
DETECTOR HOUSING TO DUCT
FOAM
GASKETS
EXHAUST TUBE
(EXTENSION BUSHING)
DUCT DETECTOR
HOUSING
O-RINGS
MOUNTING
SCREWS
SAMPLING
TUBE BUSHING
INLE
T
TUBE
END
PLUG
AIR HOLES
ARROWS
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
Figure 2A. Installation of foam gaskets over sampling tube bushings:
H0116-00
CAUTION: Do not overtighten the screws.
Exception: Where it is physically impossible to locate the
detector accordingly, the detector can be positioned closer
than six duct widths, but as far as possible from the opening, bend, or deflection plates.
Step 3. Mount Duct Housing
Remove the duct housing cover. Slide the foam gaskets over
the tube bushings as shown in Figure 2A. Make sure the
two small holes in the gaskets line up with the two duct
housing mounting holes. Put one 5/16-inch O-ring over
each of the two #10 sheet metal screws. Use the two sheet
metal screws to secure the duct housing to the duct.
Table 1. Sampling (Inlet) Tubes
TUBE OUTSIDE DUCT WIDTH
ST-1.5 1 to 2 ft. (0.3 to 0.6 m)
ST-3 2 to 4 ft. (0.6 to 1.2 m)
ST-5 4 to 8 ft. (1.2 to 2.4 m)
ST-10 8 to 12 ft. (2.4 to 3.7 m)
H0117-00
Step 4. Install The Inlet Tube
The inlet tube (shown in Figure 3) is identified by a series
of air inlet holes on the tube. This tube must be purchased
separately. Order the correct length, as specified in Table
1, for the width of the duct where it will be installed. The
exhaust tube is molded into the base of the duct housing.
The inlet tube should be installed in the inlet sampling
tube bushing located in the center of the duct detector
housing. (See Figure 2A.) The air inlet holes must face into
the air flow. To assure proper installation, the tube mounting flange is marked with arrows. Mount the inlet tube so
that the arrows point into the air flow. Figure 4 shows the
various combinations of duct detector and tube mounting
configurations with respect to air flow.
Figure 3. Air duct detector inlet sampling tube:
D500-07-00 3 I56-432-11R
H0108-00
WARNING
AIR FLOW
DIRECTION
DETECTOR
HOUSING
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DETECTOR
HOUSING
INLET
TUBE
EXHAUST
TUBE
AIR FLOW
DIRECTION
EXHAUST
TUBE
INLET
TUBE
INLET
TUBE
EXHAUST
TUBE
DETECTOR
HOUSING
AIR FLOW
DIRECTION
EXHAUST
TUBE
INLET
TUBE
DETECTOR
HOUSING
A.
B.
C.
D.
HORIZONTAL MOUNTING OF HOUSING
VERTICAL MOUNTING OF HOUSING
Figure 4. Tube mounting configurations with varying air flow direction and orientation of detector housing.
Vertical as well as horizontal mounting is acceptable.
A. Installation for Ducts Less Than 8 Feet Wide
1. If the inlet tube is longer than the width of the air duct,
Install the inlet tube as follows:
drill a 3/4-inch hole in the duct directly opposite the
hole already cut for the inlet tube.
If the inlet tube is shorter than the width of the air duct,
install the end cap into the inlet tube as shown in Figure
3.
2. Slide the inlet tube into the bushing located in the center
of the duct housing. Position the tube so that the arrows
point into the air flow.
3. Secure the tube flange to the housing bushing with the
two #6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube
should extend through the opposite side of the duct. If
there are more than 2 holes in the section of the tube
extending from the duct, select a different tube length
using Table 1. Otherwise, trim the end of the tube protruding through the duct so that 1 to 2 inches of the tube
extends outside the duct. Plug this end with the tube
end plug and tape closed any holes in the protruding
section of the tube. Be sure to seal the duct when the
tube protrudes.
5. Any inlet tube over 3 feet long must be supported on the
opposite side of the duct detector housing.
In no case should more than 2 air inlet holes be cut off the
tube. There must be a minimum of 10 holes in the tube
exposed to the air stream.
B. Installation for Ducts More Than 8 Feet Wide
NOTE: To install inlet tubes in ducts more than 8 feet
wide, work must be performed inside the air duct.
Sampling of air in ducts wider than 8 feet is accom-
D500-07-00 4 I56-432-11R
plished by using the ST-10 inlet sampling tube.
1. Drill a 3/4-inch hole in the duct directly opposite the
hole already drilled for the inlet tube.
2. Slide the inlet tube into the bushing located in the center
of the duct housing. Position the tube so that the arrows
point into the air flow. Secure the tube flange to the
housing bushing with the two #6 self-tapping screws.
3. From inside the duct, couple the other section of the
inlet tube to the section already installed using the 1/2inch conduit fitting supplied. Make sure that the holes
on both of the air inlet tubes are lined up facing the
direction of air flow.
4. Trim the end of the tube protruding through the duct so
that 1 to 2 inches of the tube extends outside the duct.
Plug this end with the tube end plug and tape closed any
holes in the protruding section of the tube. Be sure to
seal the duct when the tube protrudes.
5. Any tube (over 3 feet long) that doesn’t protrude through
the duct (on the side opposite the housing) must be supported by other means.
NOTE: An alternate method to using the ST-10 is to use
two ST-5 inlet tubes. Remove the flange from one
of the tubes and install as described above. After
the installation, use electrician’s tape to close off
some of the sampling holes so that there are a total
of 12 holes spaced as evenly as possible across the
width of the duct.
NOTE: Air currents inside the duct may cause excessive
vibration. This vibration can slowly open the
seal around the tube and permit air to escape. To
prevent this from occurring, a 3-inch floor flange,
H0109-00
available at most plumbing supply houses, may be
CAUTION
used. This flange/connector mounting technique
makes the initial installation easier because a 1inch to 1-1/4-inch hole may be drilled where the
flange/connector will be used. It is easier to push
the inlet tube through the larger hole.
Notes on Jumper Wire J5 (See Figure 5A):
1. When the detector is used in a 4-wire application (relay
circuit is being used to control fans, dampers, etc.),
jumper wire J5, located between the two terminal strips
on the printed circuit board, must be cut to insure power
supply supervision.
Modification Of Inlet Sampling Tubes
There may be situations where duct widths are not as
specified for the installation. In such cases, it is permissible
to modify an inlet sampling tube that is longer than necessary to span the duct width.
Use a 0.193-inch diameter (#11) drill and add the appropriate number of holes so that the total number of holes
exposed to the air flow in the duct is 10 to 12. Space the
additional holes as evenly as possible over the length of
the tube.
Step 5. Field Wiring
Wiring Installation Guidelines
All wiring must be installed in compliance with the
National Electrical Code and the local codes having jurisdiction, using the proper wire size(s). The conductors used
to connect smoke detectors to control panels and accessory
devices should be color-coded to reduce the likelihood of
wiring errors. Improper connections can prevent a system
from responding properly in the event of a fire.
For signal wiring, (the wiring between interconnected
detectors or from detectors to auxiliary devices), it is recommended that single-conductor wire be no smaller than
18 gauge. The duct detector terminals accommodate wire
sizes up to 14 gauge. The last foot or so of conduit should
be flexible steel conduit (available in electrical supply
houses) which facilitates installation and puts less strain
on the conduit holes in the housing. Solid conduit connections may be used, if desired.
2. When the detector is used in a 2-wire application (relay
control is not being used for any control of fans, dampers, etc.), jumper wire J5 must be left in place.
120/240 VAC Operation
To complete the wiring for 110/120 VAC operation, connect
the power supply wires to terminals 15 and 16 (see Figure
5A). If 220/240 VAC operation is preferred, connect the
power supply wires to terminals 16 and 17.
24 VAC/DC Operation
To complete the wiring for 24 VAC or DC, connect the
power supply wires to terminals 7 and 8. Polarity is not
important.
Step 6. Install the Filters
Most duct installations are subject to dust accumulation.
System filters remove a large percentage of this contamination, but cannot remove all of it. Dust inside the duct
detector causes problems. First, very fine particles of dust
can enter the detector sensing chamber and cause the unit
to alarm. Second, the accumulation of dust and dirt necessitates a more frequent periodic cleaning schedule, which
can result in substantial cost and/or down time.
Disposable sampling tube filters can greatly reduce the
nuisance alarms caused by dust, and can also significantly
extend the maintenance interval. To install the sampling
tube filters, insert the filter adapter into the exhaust tube
and push the filter onto the adapter tube on the left, as
shown in Figure 6. Then, install the other filter over the
end of the inlet sampling tube.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the control panel being used
before wiring the detector loop.
Filters require periodic cleaning or replacement, depending on the amount of dust and dirt accumulated. Inspect
the filters at least quarterly – more often if dust accumulation warrants it. Replacement filters can be ordered from
Notifier. (Exhaust tube/intake tube filter P/N F36-05-00.)
Wiring Instructions
The DH500ACDC is designed for easy wiring. The housing
provides a terminal strip with clamping plates. Wiring connections are made by stripping approximately 3/8-inch of
insulation from the end of the wire, sliding this bare end
under the plate, and tightening the clamping plate screw.
Filters rarely have a significant effect on the behavior of
smoke. As a result, even a filter that is as much as 90%
clogged does not significantly affect the entry of smoke
into the duct detector housing. Therefore, visual inspection
is usually all that is necessary to determine if filters need
replacement.
The DH500ACDC is built for 120/240 VAC or 24 VAC/DC
to operate auxiliary functions. See Figure 5A for operating
and wiring details.
D500-07-00 5 I56-432-11R
ALARM SIGNAL (+)
AUX POWER (–)
2
6
(+)
(–)
DUCT DETECTOR
DH500ACDC
PA400 (OPTIONAL)
AUDIBLE ALERT
ALARM SIGNAL (+)
AUX POWER (–)
2
6
(+)
(–)
DUCT DETECTOR
DH500ACDC
RA400Z (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
RED
ALARM SIGNAL (+)
AUX POWER (–)
2
6
1
2
DUCT DETECTOR
DH500ACDC
RTS451/RTS451KEY
(OPTIONAL) REMOTE
TEST STATION
RED
5
3
1
4
TEST (+)
3
ACCESSORY CURRENT LOADS AT 24VDC
DEVICE
PA400
RA400Z
RTS451/RTS451KEY
STANDBY
0mA
0mA
0mA
ALARM
15mA MAX
10mA MAX
10mA MAX
ANY COMBINATION OF ACCESSORIES MAY BE USED
SUCH THAT THE GIVEN CURRENT LOADS TOTAL:
AUX POWER (+)
TEST (–)
STANDBY STATE:
ALARM STATE:
30mA OR LESS
80mA MAX, 24 VDC (TERMINALS 3 & 6)
20mA MAX, AUXILIARY ALARM OUTPUT (TERMINALS 2 & 6).
NOTE: THE RTS451 RESET CANNOT BE USED ON THE DH500ACDC.
TEST (–)
RESET
(NOT USED)
4 5
6 7 8 9 10 11 12 13 14 15 16 17
+ –
COMMUNICATION
LINE
FROM PANEL
(+)
(–)
(+)
(–)
COMMUNICATION
LINE TO REST
OF SYSTEM
NOTE: FOR POWER SUPPLY
WIRES, POLARITY IS NOT
IMPORTANT.
ALWAYS RUN AUXILIARY CONTROL
WIRING IN SEPARATE CONDUIT
J5
K2
1 2 3
24 VAC &
24 VDC
240 VAC
120 VAC
NOTE: WHEN INITIATING AN ALARM, THE RTS451/RTS451KEY REQUIRES
95mA MAXIMUM IN PRE-ALARM AND 103mA MAXIMUM IN ALARM.
NOMINAL STANDBYCURRENT IS 0mA. ALARM CURRENT IS 8mA
MAXIMUM WHEN TEST MAGNET IS REMOVED.
*
* *
Figure 5. Wiring diagram:
H0310-00
Figure 5B
Figure 5EFigure 5D
Figure 5A
auxiliary power. See Figure 5A for voltage/termination.
Figure 5C
NOTE: Auxiliary devices (RA400Z, PA400, RTS451/RTS451KEY) and auxiliary control contacts will not function without
D500-07-00 6 I56-432-11R
Step 7. Per form Detector Check
CAUTION
SAMPLING TUBE
FILTERS
SAMPLING TUBE
MOUNTING
SCREWS
DETECTOR HEAD
EXHAUST
FILTER ADAPTER
DETECTOR BASE
INLET SAMPLING TUBE
FOAM GASKET
7.1 Air Flow
1. To verify sufficient sampling of ducted air, use a manometer to measure the differential pressure created from
air flow across the sampling tubes. The pressure should
measure no less than 0.01 inches of water and no greater
than 1.20 inches of water.
B. RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facili-
tates testing of the duct detector alarm capability.
The DH500ACDC duct detector cannot be reset by the
RTS451/RTS451KEY. It must be reset at the system control panel.
2. To determine that smoke is capable of entering the sensing chamber, conduct a visual examination to note any
obscurations around the sensing chamber. If a smoke
test is required, blow smoke from a cigarette, cotton
wick, or punk directly at the smoke detector head. It is
important to plug the exhaust and sampling tube hole
to prevent ducted air from blowing smoke away from
the smoke detector head. Record all test records in the
Detector Test Log at the end of this manual.
Remove the plugs after testing or the detector will not
sense smoke in the air duct.
7.2 Alarm Tests
Before replacing the duct housing cover, check the detector
interconnections. Check the DH500ACDC as follows:
A. M02-04-00 Magnet Test
1. Make sure power is applied to the detector.
2. Position the painted surface of the test magnet against
the housing next to the rib molded onto the outside of
the housing (see Figure 7).
3. The LEDs on the detector should latch on as should
any accessories (PA400, RA400ZA, RTS451) and the
alarm condition verified at the control panel. The
control panel must be active to initiate an alarm.
Figure 6. Sampling tube filter installation:
To install the RTS451/RTS451KEY test coil, connect the
device as shown in Figure 9. Place the coil in the detector
housing with the arrow facing up and pointing toward the
detector as in Figure 9. Attach the coil leads to the housing
terminals as shown; polarity is not important. Firmly screw
the test coil mounting bracket in place over the test coil.
The resistance of the wire connecting the remote test station to the duct detector must be less than 25 ohms.
7.3 MOD400R Sensitivity Test
After verification of alarm capability, use a MOD400R test
module with a voltmeter to check detector sensitivity as
described in the MOD400R installation manual. The housing cover must be removed to perform this test.
If the MOD400R readings indicate that the sensor head is
outside of the acceptable range, the sensor heads require
cleaning (refer to Periodic Maintenance Requirements).
7.4 Trouble Test
The capability of trouble detection is tested by removing
the detector head from the duct housing. The detector
head is removed by rotating it counterclockwise about
10 degrees (Figure 8). The system control panel should
indicate a trouble condition. Reinstalling the detector head
should clear the trouble condition.
D500-07-00 7 I56-432-11R
H0239-00
TEST
LOCATOR
TEST
MAGNET
PAINTED SIDE
TOWARD HOUSING
DUCT
HOUSING
DETECTOR
HEAD
RESET
LOCATOR
TWIST
COUNTERCLOCKWISE
TO REMOVE
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
DETECTOR
HEAD
Figure 7. Testing detector alarm: Figure 8. Detector head removal:
DETECTOR
HEAD
TEST COIL
H0244-00H0243-00
Step 8. Install the Cover
Install the cover using the four screws. Be certain filters are
installed as specified in Step 6. Make sure that the cover fits
into the base groove and that all gaskets are in their proper
positions. Tighten the four cover screws to 10 in-lbs.
Step 9. Per form the Final System Check
Position the test magnet as shown in Figure 7. The LEDs
on the detector should light. Any accessory LED(s) should
also light and the system control panel should indicate an
alarm condition.
Periodic Maintenance Requirements
Air duct smoke detectors should be maintained at least
once a year – more often if the detector heads become
obviously dirty. The detectors must also be cleaned immediately after a fire. Failure to properly maintain air duct
smoke detectors may cause unnecessary false alarms.
Figure 9. RTS451/RTS451KEY Test Coil Installation:
It is recommended that a permanent Detector Test Log be
set up and maintained, with a record for each individual
smoke detector in each building. Each detector should be
clearly described, with information on the type of detector,
the model number, the serial number (if any), the location,
and the type of environment. Data entries should include
test dates, type of test mode, test results, maintenance, and
comments. A Detector Test Log is included at the end of
this manual.
Recommended Detector Maintenance Procedure
NOTE: Notify the proper authorities that the smoke detec-
tor system is undergoing maintenance and will be
temporarily out of service. Disable the zone or system undergoing maintenance to prevent unwanted
alarms and possible dispatch of the fire department.
D500-07-00 8 I56-432-11R
H0245-0
1. Turn off power to the system.
LOCK PRONG
REMOVABLE SCREEN
(P/N RS14)
REMOVABLE
COVER
FOR
CLEANING
SENSING CHAMBER
REMOVABLE HEAD COVER
CLEANABLE SCREEN
HEAD COVER
REMOVAL SLOT
TEST SLOT
VANED CHAMBER
P/N RS24 (W/O THERMAL)
2. Remove and inspect sampling tube filters.
3. If filters are heavily coated with dirt, replace them with
new filters. If they are not heavily coated, use a vacuum
cleaner or compressed air nozzle to remove dust, then
install the filters.
4. Remove the detector from the housing. (See Figure 8.)
Photo Units
5. Remove the detector cover by inserting a small-bladed
screwdriver into the slot located approximately 90
degrees from the MOD400 test jack. Rotate the cover
counterclockwise to remove it. See Figure 10.
6. Lift the screen from the photo chamber. Vacuum the
screen and cover before using clean, compressed air to
loosen and blow out any remaining debris (replacement
screens are available, part no. RS24).
7. Vacuum the photo chamber. Then, use clean compressed
air to blow it clean.
8. Replace the screen by aligning the arrow on top with the
test slot in the base of the detector. Press the screen into
place. It should fit tightly in the chamber.
Ion Units
9. See Figure 11. Remove the cover and screen assembly
by depressing the three lock prongs on the top of the
cover and rotating the cover counterclockwise. The
CRT400 Cover Removal Tool makes cover removal
easier.
10. Carefully pull the screen out of the cover.
11. Clean the screen thoroughly with a soft brush or vacu-
um cleaner (replacement screens, part no. RS14).
12. Brush or vacuum the inside of the cover. The cover
may then be blown out using clean compressed air.
13. Vacuum the sensing chamber before using clean,
compressed air to loosen and blow out any remaining
debris.
14. Press the screen back into the cover.
15. Replace the detector cover on the sensing chamber.
Rotate it clockwise to lock it in place.
Both Types Of Units
16. Reinstall the detector in its housing.
17. Restore system power.
18. Put detector into alarm using appropriate method
described in STEP 7.
Perform Detector Check
19. Notify the proper authorities that testing has been
completed and the smoke detector system is back in operation.
20. Other checks that should be made during maintenance
procedures:
— Holes or cracks in duct work near vicinity of detec-
tor.
— Air leaks where detector housing or sampling tubes
are attached to duct.
— Dust accumulations in or on sampling tubes.
— Wiring terminal screw tightness.
Figure 10. Photo head exploded view:
H0261-00
Figure 11. Ion head, exploded view:
H0246-00
D500-07-00 9 I56-432-11R
Accessories Part No.
CAUTION
Remote LED RA400ZA
Piezo Alert Sounder PA400
Replacement Filters F36-05-00
Magnet M02-04-00
End Plug For Sampling Tube P48-21-00
Installation Kit (Parts bag) A2650-01
Ionization Replacement Screen RS14
Sensitivity Test Kit MOD400R
Ionization Cover Removal Tool CRT400
Remote Test Station RTS451/RTS451KEY
Programming Specifications/Requirements For
Intelligent System Control Panels
Models 1551 and 2551 can be used with the DH500ACDC if
the following constraints are observed.
1. There may be a limit to the number of devices per zone
that can have their LEDs latched on. The number of
devices is determined by the control panel and its ability to supply LED current. If more than the maximum
number of devices is on the same loop, do NOT use
the DH500ACDC for control purposes. Control for duct
applications would need to come directly from the control panel or by using control modules.
2. The duct control circuitry (auxiliary relay contacts and
auxiliary alarm output) may change states if the sensor
is tested and the LED is turned on for more than 4 seconds. If the LED is latched on for less than 4 seconds,
the control circuitry of the DH500ACDC will NOT operate.
3. The panel must not poll the same unit for more than
4 seconds continuously or the auxiliary relay and auxiliary alarm output may switch states. After 4 seconds
of continual polling of a device, the panel must wait a
minimum of 100ms before polling or communicating to
that same device.
4. Communications must not cease for more than 3 seconds without an additional clock pulse (after Pulse
Width 5) to turn off the LED on the sensor.
5. To allow the auxiliary relay and auxiliary alarm output
to return to a standby condition, (after being in alarm)
the panel must wait a minimum of 100ms after turning
off the sensor LED before communicating to that device
again.
D500-07-00 10 I56-432-11R
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
System Sensor warrants its enclosed air duct smoke detector to be free
from defects in materials and workmanship under normal use and service for a period of three years from date of manufacture. System Sensor
makes no other express warranty for this air duct smoke detector. No
agent, representative, dealer, or employee of the Company has the authority to increase or alter the obligations or limitations of this Warranty. The
Company’s obligation of this Warranty shall be limited to the repair or
replacement of any part of the air duct smoke detector which is found to
be defective in materials or workmanship under normal use and service
during the three year period commencing with the date of manufacture.
After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672)
for a Return Authorization number, send defective units postage prepaid
to: System Sensor, Repair Department, RA #__________, 3825 Ohio
D500-07-00 11 I56-432-11R
Avenue, St. Charles, IL 60174. Please include a note describing the malfunction and suspected cause of failure. The Company shall not be obligated to repair or replace units which are found to be defective because
of damage, unreasonable use, modifications, or alterations occurring
after the date of manufacture. In no case shall the Company be liable for
any consequential or incidental damages for breach of this or any other
Warranty, expressed or implied whatsoever, even if the loss or damage is
caused by the Company’s negligence or fault. Some states do not allow
the exclusion or limitation of incidental or consequential damages, so the
above limitation or exclusion may not apply to you. This Warranty gives
you specific legal rights, and you may also have other rights which vary
from state to state.
DETECTOR TEST LOG
Detector Identification Information
Manufacturer and Serial Date
Detector Model:______________________ Number: ______________________ Installed: ___________________
Description of Detector Location:
________________________________________________________________________________________________
________________________________________________________________________________________________
________________________________________________________________________________________________
Test Results and Maintenance Data
Date Test Test Maintenance
Tested Description Results Performed Comments
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
_______ _________ ______ __________ ______________________
D500-07-00 12 I56-432-11R
2001 System Sensor
©
Loading...