INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
DH400ACDCP Air Duct Smoke Detector
Before Installing
[1] General Description
Please thoroughly read the System Sensor Guide for
Proper Use of Smoke Detectors in Duct Applications
(A05-1004), which provides detailed information on de-
tector spacing, placement, zoning, wiring, and special
applications. Copies of this manual are available online
fax-back service, Documents on Demand at 800/736-7672.
NFPA Standards 72 and 90A should also be referenced for
detailed information.
An HVAC system supplies conditioned air to virtually ev-
ery 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.
Model DH400ACDCP Air Duct Smoke Detector utilizes
photoelectric technology for the detection of smoke. This
smoke detection method, when combined with an efficient
housing design, samples air passing through the duct and
allows detection of a developing hazardous condition.
When sufficient smoke is sensed, an alarm signal is initi-
ated at the fire control panel monitoring the detector, and
appropriate action can be taken to shut off fans and blow-
ers, change over air handling systems, etc. These actions
can facilitate the management of toxic smoke and fire gases
throughout the areas served by the duct system.
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.
Table of Contents
[1] General Description
Page
1
DH400ACDCP detectors are designed to operate from 24
VDC, 24 VAC, 120 VAC, or 240 VAC. Alarm and supervisory
relay contacts are available for control panel interface
(alarm initiation), HVAC control, and other auxiliary func-
tions. These detectors are not designed for 2-wire appli-
cation.
[2] Exploded View of Duct Detector Components
[3] Contents of the Duct Detector Kit
[4] Limitations of Duct Detectors
[5] Installation Sequence
[6] Duct Detector Maintenance and Test Procedures
[7] Detector Cleaning Procedures
[8] Specifications
2
2
2
2
8
10
12
13
16
For testing, the alarm can be enabled by a magnet activated
test switch, by insertion of a calibrated test card into the
sensing chamber (photoelectronic version only), or by the
optional remote test station. The duct smoke detectors latch
into alarm state when alarm occurs. LEDs on each detector
illuminate to provide local alarm indication, and optional
accessories offer a variety of annunciation capabilities.
Warranty
Detector Test log
List of Tables and Figures
Page
Fig. 1: Duct Detector Exploded View
Fig. 2: Installation of Sampling Tube Gaskets
Fig. 3: Mounting Location of Speed Nuts
Table 1: Inlet Sampling Tube Selection
Fig. 4: Inlet Sampling Tube
2
3
3
3
4
The detector can be reset by a momentary power inter-
ruption, by the magnet activated reset switch, or by the
optional remote test station.
Fig. 5: Sampling Tube Mounting Configurations
Fig. 6: Wiring Diagram
4
6
Fig. 7: Wiring Diagram – No Control Panel
Fig. 8: Wiring Diagram – Accessories
Fig. 9: Sampling Tube Filter Installation
Fig. 10: Testing Detector Alarm
7
8
8
9
Fig. 11: Detector Head Removal
9
Fig. 12: RTS451/RTS451KEY Test Coil Installation
Fig. 13: Photo Head Exploded View
10
11
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feet per minute. Be sure to check engineering specifications [5.4] Install The Inlet
to ensure that the air velocity in the duct falls within these The inlet tube (shown in Figure 4) is identified by a series
parameters. If necessary, use a velocity meter to check the of air inlet holes on the tube. This tube must be purchased
air velocity in the duct.
separately. Order the correct length, as specified in Table 1,
for width of the duct where it will be installed. The exhaust
tube is molded into the base of the duct housing, and the
[5.2] Drill The Mounting Holes
Remove the paper backing from the mounting template A2440-00 Exhaust Tube Extension is available as an ac-
supplied. Affix the template to the duct at the desired cessory in those cases where the molded exhaust port does
mounting location. Make sure the template lies flat and not extend at least 2 inches into the duct.
smooth on the duct. Center punch holes A and B. Drill the
holes as indicated on the template. Slide the two speed nuts The inlet tube is always installed in the centermost hous-
over the two small holes (hole A) next to the sampling tube ing bushing, with air inlet holes facing into the air flow.
bushing holes (hole B) previously drilled in the duct. (See To assist proper installation, the tube’s mounting flange is
Figure 3.)
marked with arrows. Make sure the inlet tube is mounted
so that the arrows point into the air flow. Figure 5 shows
the various combinations of tube mounting configurations
[5.3] Secure The Detector Housing To The Duct
Remove the duct housing cover. Slide the foam gaskets over with respect to air flow.
the tube bushings as shown in Figure 2. Make sure the two
small holes in the gaskets line up with the two base mount- Mounting the detector housing in a vertical orientation is
ing holes. Put one 5/16-inch O-ring over each of the two acceptable, provided that the air flows directly into the
#10 sheet metal screws. Use the two sheet metal screws to sampling tube holes as indicated in Figure 4.
screw the detector housing to the duct. CAUTION: Do not
overtighten the screws.
Table 1. Inlet tubes required for different duct
widths:
Figure 2. Installation of foam gaskets over sampling
tube bushings:
Outside Duct Width
1 to 2 ft.
Inlet Tube Required
ST-1.5
ST-3
ST-5
2 to 4 ft.
4 to 8 ft.
8 to 12 ft.
DUCT DETECTOR
HOUSING
INLET SAMPLING
TUBE BUSHING
MOUNTING
SCREWS
ST-10
EXHAUST TUBE
(EXTENSION BUSHING)
O-RINGS
FOAM GASKETS
SCREW HOLES FOR ATTACHING
DETECTOR HOUSING TO DUCT
H0238-00
Figure 3. Speed nut mounting location:
HOLE B
HOLE A
DUCT
WALL
SPEED
NUT
H0116-00
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Figure 4. Air duct detector inlet sampling tube:
AIR HOLES
FLANGE
INLET
TUBE
END
PLUG
ARROWS
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
H0108-00
Figure 5. Tube mounting configurations with varying air flow direction:
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
AIR FLOW
DIRECTION
DETECTOR
HOUSING
DETECTOR
HOUSING
B.
A.
INLET
TUBE
EXHAUST
TUBE
EXHAUST
TUBE
INLET
TUBE
HORIZONTAL MOUNTING OF HOUSING
EXHAUST
TUBE
DETECTOR
HOUSING
EXHAUST
TUBE
AIR FLOW
DIRECTION
AIR FLOW
DIRECTION
INLET
INLET
TUBE
TUBE
C.
DETECTOR
HOUSING
D.
H0109-00
VERTICAL MOUNTING OF HOUSING
[5.4.1] Installation For Ducts Less Than 8 Feet Wide
1. If the tube is longer than the width of the air duct, drill
a 3/4-inch hole in the duct directly opposite the hole
already cut for the inlet tube. If the tube is shorter than
the width of the air duct, install the end plug into the
outside the duct. Plug this end with the end plug and
tape closed any holes in the protruding section of the
tube. Be sure to seal the duct when the tube protrudes.
WARNING
inlet tube as shown in Figure 4. Sampling tubes over 3 In no case should more than 2 air inlet holes be cut off the
ft. long must be supported at the end opposite the duct tube. There must be a minimum of 10 holes in the tube ex-
detector.
posed to the air stream.
2. Slide the tube into the centermost housing bushing. Po-
sition the tube so that the arrows point into the air flow. [5.4.2] Installation For Ducts More Than 8 Feet Wide
3. Secure the tube flange to the housing bushing with two NOTE: To install inlet tubes in ducts more than 8 feet
#6 self-tapping screws.
wide, work must be performed inside the air
duct. Sampling of air in ducts wider than 8 feet
is accomplished by using the ST-10 inlet sampling
tube. If the tube is shorter than the width of the
air duct, install the end plug into the inlet tube as
shown in Figure 4 and support the end opposite
the duct detector.
4. For tubes longer than the width of the air duct, the tube
should extend out of the opposite side of the duct. If
there are more than 2 holes in the section of the tube
extending out of the duct, select a different length using
Table 1. Otherwise, trim the end of the tube protruding
through the duct so that 1 to 2 inches of the tube extend
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[5.5] Field Wiring
Install the inlet tube as follows:
Installation Guidelines
1. Drill a 3/4-inch hole in the duct directly opposite the All wiring must be installed in compliance with the National
hole already drilled for the inlet tube. Electrical Code and the local codes having jurisdiction.
2. Slide the inlet tube with the flange into the centermost Proper wire gauges should be used. The conductors used
housing bushing. Position the tube so that the arrows to connect smoke detectors to control panels and accessory
point into the air flow. Secure the tube flange to the devices should be color-coded to reduce the likelihood of
housing bushing with two #6 self-tapping screws.
wiring errors. Improper connections can prevent a system
3. From inside the duct, couple the other section of the from responding properly in the event of a fire.
inlet tube to the section already installed using the 1/2-
inch conduit fitting supplied. Make sure that the holes For signal wiring, (the wiring between interconnected de-
on both of the air inlet tubes are lined up and facing into tectors or from detectors to auxiliary devices), it is usually
the air flow.
recommended that single-conductor wire be no smaller
4. Trim the end of the tube protruding through the duct so than 18 gauge. The duct detector terminals accommodate
that 1 to 2 inches of the tube extend outside the duct. wire sizes up to 14 gauge. The last foot of conduit should
Plug this end with the end plug and tape closed any be flexible steel conduit (available in electrical supply
holes in the protruding section of the tube. Be sure to houses), which facilitates installation and puts less strain
seal the duct when the tube protrudes.
on the conduit holes in the housing. Solid conduit connec-
tions may be used, if desired.
NOTE: An alternate method to using the ST-10 is to use
two ST-5 inlet tubes. Remove the flange from one Smoke detectors and alarm system control panels have
of the tubes and install as described above. After specifications for allowable loop resistance. Consult the
the installation, use electrical tape to close off control panel manufacturer’s specifications for the total
some of the sampling holes so that there is a to- loop resistance allowed for the particular model control
tal of 10 to 12 holes spaced as evenly as possible panel being used before wiring the detector loop.
across the width of the duct.
Wiring Instructions
Air currents inside the duct may cause excessive vibration, The DH400ACDCP detectors are designed for easy wiring.
especially when the longer sampling tubes are used. In The housing provides a terminal strip with clamping plates.
these cases a 3 inch floor flange (available at most plumb- Wiring connections are made by stripping about 3/8-inch
ing supply stores) may be used to fasten the sampling tube of insulation from the end of the wire, sliding the bare end
to the other side of the duct. When using the flange/con- under the plate, and tightening the clamping plate screw.
nector mounting technique, drill a 1 inch to 1-1/4-inch hole
where the flange will be used.
The DH400ACDCP duct detector is designed to operate
from 24 VDC, 24 VAC, 120 VAC, or 240 VAC.
[5.4.3] Modifications Of Inlet Sampling Tubes
There may be applications where duct widths are not what The detector may be wired for interconnection to UL listed
is specified for the installation. In such cases, it is permis- control panels, or for stand alone service per NFPA 90A.
sible to modify an inlet sampling tube that is longer than Refer to the wiring diagrams of Figures 6, 7, and 8 to select
necessary to span the duct width.
the appropriate circuit for your application.
Use a 0.193-inch diameter (#11) drill and add the appro-
priate 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.
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Figure 6. System wiring diagram for duct detectors using a UL listed control panel (see Figure 8 for wiring of
optional accessories):
CAUTION
Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections.
H0252-00
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Figure 7. Wiring diagram for duct detector systems equipped without a control panel (see Figure 8 for wiring
of additional optional accessories):
AVAILABLE POWER INPUTS
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50-60 HZ,
120 VAC 50-60 HZ, OR
1
2
12
13
14
SEE SPECIFICATIONS FOR
ADDITIONAL POWER
SUPPLY INFORMATION.
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
120
VAC
24V
220/240
VAC
ALARM AUXILIARY CONTACT RATINGS
10A @ 30 VDC
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
10A @ 250 VAC
15
16
17
18
19
20
500mA MINIMUM @ 24 VDC
NOT INTENDED FOR CONNECTION
TO CONTROL PANELS.
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
N.C.
C.
N.O.
N.O.
C.
N.C.
MANUFACTURER’S
INSTALLATION INSTRUCTIONS
OR CONTACT MANUFACTURER.
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
ALARM INITIATION CONTACTS
ALARM INITIATION CONTACT RATING
2.0A @ 30 VAC/DC (0.6 POWER FACTOR)
9
8
N.O.
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
REMOVED, AND DURING RESET. OPEN CONTACTS
SIGNAL TROUBLE CONDITION TO PANEL.
5
2
1
ALARM
(+) ALARM SIGNAL
6
COMMON
RED
(–) AUX POWER
7
TROUBLE CONTACT RATING
0.3A @ 32 VAC/DC
(+) AUX POWER
FIELD
INSTALLED
JUMPER
10
TROUBLE CONTACTS CLOSED IN STANDBY AND ALARM.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER
IS REMOVED, AND DURING RESET. OPEN CONTACTS
EXTINGUISH OPTIONAL APA451 GREEN “POWER” LED
TO INDICATE TROUBLE CONDITION.
GRN.
TROUBLE
CONTACTS
11
3
POWER
DH400ACDCP
DUCT DETECTOR
APA451
AUDIBLE PIEZO ALERT WITH ALARM AND
POWER (TROUBLE) LEDS. FOR STAND ALONE
APPLICATIONS ONLY. APA451 RECOMMENDED
FOR COMPLIANCE TO NFPA 90A. LOCATE IN
NORMALLY OCCUPIED AREA OF PREMISES.
H0253-00
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Figure 8. Wiring diagrams for optional accessories (see Figure 7 for APA451 wiring diagram):
(+)
(+)
5
5
5
6
1
2
ALARM SIGNAL (+)
AUX POWER (–)
ALARM SIGNAL (+)
AUX POWER (–)
ALARM SIGNAL (+)
AUX POWER (–)
R
E
D
RED
6
(–)
6
(–)
4
3
5
FIELD
INSTALLED
JUMPER
3
4
DUCT DETECTOR
DH400ACDCP
PA400 (OPTIONAL)
AUDIBLE ALERT
DUCT DETECTOR
DH400ACDCP
RA400Z (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
RESET (–)
TEST (–)
RESET
TEST
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
STANDBY ALARM
12mA MAX 30mA MAX
DUCT DETECTOR
DH400ACDCP
RTS451/RTS451KEY
(OPTIONAL) REMOTE
TEST STATION
0mA
0mA
15mA MAX
10mA MAX
10mA MAX*
RA400Z
RTS451/RTS451KEY 0mA*
ANY COMBINATION OF ACCESSORIES MAY BE USED SUCH THAT THE GIVEN
CURRENT LOADS TOTAL:
100mA OR LESS IN THE STANDBY STATE,
150mA OR LESS IN THE ALARM STATE.
*NOTE: WHEN INITIATING AN ALARM, THE RTS451/RTS451KEY REQUIRES 95mA MAXIMUM
IN PRE-ALARM AND 103mA MAXIMUM IN ALARM. NOMINAL STANDBY
CURRENT IS 0mA. ALARM CURRENT IS 10mA MAXIMUM WHEN TEST
MAGNET IS REMOVED.
H0254-00
[5.6] Install The Filters
[5.7] Perform Detector Check
To install the sampling tube filters, simply push the filter 1. Perform the STANDBY AND TROUBLE TEST per Section
adapter into the exhaust tube, and push the filter onto the [6.2.1].
adapter tube on the left, as shown in Figure 9. Install the 2. Perform the MAGNET TEST per Section [6.2.2.1]. The
other filter over the end of the inlet sampling tube.
RTS451 test of Section [6.2.2.2] may substitute for this
requirement.
Figure 9. Sampling tube filter installation:
3. Perform the AIR FLOW TEST per Section [6.1.1].
4. Perform the SMOKE RESPONSE TEST per Section
[6.1.2].
INLET SAMPLING TUBE
5. Perform the SENSITIVITY TEST per Section [6.2.3].
6. Record all test results in the Detector Test Log at the end
of this manual.
FOAM GASKET
[5.8] Install The Cover
SAMPLING TUBE
MOUNTING
SCREWS
Install the cover using the four screws that are fixed in the
housing cover. Be certain filters are installed as specified
in Section [5.6]. Make sure that the cover fits into the base
groove and that all gaskets are in their proper positions.
Tighten the four screws to 10 in-lbs.
DETECTOR BASE
EXHAUST
FILTER ADAPTER
DETECTOR HEAD
SAMPLING TUBE
[6] Duct Detector Maintenance And Test Procedures
Test and maintain duct detectors as recommended in NFPA
72. The tests contained in this manual were devised to
assist maintenance personnel in verification of proper de-
tector operation.
FILTERS
H0239-00
CAUTION
Filters require periodic cleaning or replacement, depending
on the amount of dust and dirt accumulated. Visually in-
spect the filters at least quarterly; inspect them more often
if the dust accumulation warrants it. See Section [6] for
more information. Replacement filters can be ordered from
System Sensor, 3825 Ohio Ave., St. Charles, IL 60174. (Ex-
haust tube/intake tube filter P/N F36-05-00).
Before conducting these tests, notify the proper authorities
that the smoke detection system will be temporarily out of
service. Disable the zone or system under test to prevent
unwanted alarms.
After conducting these tests, record the appropriate infor-
mation in the Detector Test Log at the end of this manual.
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Figure 10. Testing detector alarm:
Figure 11. Detector head removal:
DETECTOR
HEAD
DETECTOR
HEAD
TWIST
COUNTERCLOCKWISE
TO REMOVE
DUCT
HOUSING
TEST
RESET
LOCATOR
TEST
LOCATOR
MAGNET
PAINTED SIDE
TOWARD HOUSING
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
H0250-00
H0251-00
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
Trouble- If the detector LEDs do not blink or if the APA451
Power LED is not illuminated, the detector lacks
power (check wiring, panel, or power supply),
the head is missing (install), or the unit is defec-
tive (return for repair).
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.
Test-
The trouble condition can be caused
intentionally to verify correct operation of the
system. Remove power to the unit, remove the
detector head (see Figure 11), or place the M02-
04-00 magnet into the Reset locator, as shown in
Figure 10. These actions should cause a trouble
condition locally and at the system control
panel.
[6.1.2] Smoke Response
To determine if smoke is capable of entering the sensing
chamber, visually identify any obstructions. Plug the ex-
haust and inlet tube holes to prevent ducted air from car-
rying smoke away from the detector head, then blow smoke
such as cigarette, cotton wick, or punk directly at the head
to cause an alarm. REMOVE THE PLUGS AFTER TESTING
OR THE DETECTOR WILL NOT FUNCTION PROPERLY.
[6.2.2] Alarm Tests
[6.2.2.1] M02-04-00 Magnet Test
1. Place the painted surface of the magnet into the Test
locator molded into the side of the housing (see Figure
10).
[6.1.3] Filter Replacement
The filters do not substantially affect smoke behavior
even when they are up to 90% clogged. Quarterly visual
inspection is usually often enough to determine if filters 2. The red alarm LEDs on the detector should latch on,
should be replace because only a high percentage of con-
tamination affects duct detector performance.
as should any accessories (PA400, RA400Z, RTS451,
APA451). Verify auxiliary functions (such as fan shut-
down) and system control panel alarm status.
[6.2] Standby, Alarm, And Sensitivity Tests
[6.2.1] Standby And Trouble
3. Place the painted surface of the magnet into the Reset
locator molded into the side of the housing (see Figure
10). This should clear the latched alarm condition at the
detector. If a system control panel is used, the panel may
also require resetting.
Standby- Check for the presence of the blinking red LEDs
(blinks about every 10 seconds) through the
transparent housing cover. If the APA451 ac-
cessory is used, its green Power LED should be
illuminated continuously.
[6.2.2.2] RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates test
of the alarm capability of the duct detector as indicated in
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Figure 12. RTS451/RTS451KEY test coil installation:
TEST COIL
DETECTOR
HEAD
H0245-00
the RTS451/RTS451KEY manual. The DH400ACDCP duct
detector can be reset by the RTS451/RTS451KEY. If a sys-
tem control panel is used, the panel itself may also require
resetting.
ing and wait 50 seconds for power up. Do not hold the
swirl chamber to twist the detector head.
5. Insert the NO ALARM end of the test card into the test
slot (see Figure 13) and slide it counterclockwise until it
stops. The detector should not alarm after 20 seconds.
6. Remove the card and then insert the ALARM end into
the slot and slide it counterclockwise until it stops. The
LEDs should latch on within 20 seconds. Remove card
and reset detector.
7. Put the cover back by gently rotating it clockwise until it
locks in place. Secure the duct housing cover using the
4 cover screws.
To install the RTS451/RTS451KEY, connect the device as
shown in Figure 8; wire runs must be limited to 25 ohms or
less per interconnecting wire. Place the coil in the detector
housing with the arrow facing up and pointing toward the
detector as in Figure 12. Attach the coil leads to the hous-
ing terminals as shown; polarity is not important. Firmly
screw the bracket in place over the test coil.
[6.2.3] Sensitivity Tests
[6.2.3.1] MOD400R Sensitivity Test
After verification of alarm capability, use the MOD400R test
module with a voltmeter to check detector sensitivity as
described in the test module’s manual. The housing cover
must be removed to perform this test.
[7] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector sys-
tem is undergoing maintenance, and that the system will
be temporarily out of service. Disable the zone or system
undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department.
If test module readings indicate that the detector head is
outside of the acceptable range that is printed on the back
of the detector head, the detector head requires cleaning
per Section [7].
[7.1] Air Filters
1. Turn off power to the system.
2. Remove and inspect the sampling tube filters.
3. If the 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 reinstall the filters.
[6.2.3.2] R59-18-00 CALIBRATED TEST CARD (photo-
electronic units only)
After verification of alarm capability, the R59-18-00 test
card may be used to verify correct sensitivity of the de-
tector head.
1. Remove the duct housing cover.
2. Remove the detector head from the housing as shown in
Figure 11.
[7.2] Photo Heads
1. Remove the detector cover by inserting a small bladed
screwdriver into the slot located 90 degrees from the
field test port. Rotate the cover counterclockwise to re-
move (see Figure 13).
3. Remove the detector head cover by placing a small
blade screwdriver in the side slot of the detector cover,
twisting it slightly until the cover can be turned counter-
clockwise.
2. 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 (RS24) are available.
4. Carefully reinsert the detector head into the duct hous-
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I56-555-09R
Figure 13. Photo head exploded view:
REMOVABLE HEAD COVER
TEST SLOT
CLEANABLE SCREEN
P/N RS24 (W/O THERMAL)
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
H0261-00
3. Vacuum the photo chamber. Use clean compressed air to
blow it clean.
4. Replace the screen by aligning the arrow on top with
the field test port on the detector. Press the screen into
place. It should fit tightly on the chamber.
5. Replace the detector cover and rotate it clockwise to lock
it in place.
[7.4] Reinstallation
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check, Section [5.7].
4. Notify the proper authorities testing has been completed
and the smoke detector system is back in operation.
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I56-555-09R
[8] Model DH400ACDCP Air Duct Smoke Detector Specifications
Description
HVAC air duct mounted ionization or photoelectronic smoke detector for separately powered systems or stand alone sys-
tems. Auxiliary alarm relay contacts provide fan contactor shutdown to prevent HVAC circulation of smoke.
Environmental Limits
Temperature:
32°F to 120°F
0°C to 49°C
Humidity:
Air Velocity:
10% to 93% R.H. non-condensing
500 to 4000 Ft/min.
2.54 to 20.3 m/sec.
Test Features
Magnetic test switch, magnetic reset switch, MOD400R test module (optional), RTS451 Remote Test Station (optional).
Mechanical Specifications
Length:
14.5 inches 37 cm
Width:
Depth (installed):
Weight:
5 inches
4 inches
4 pounds
13 cm
10 cm
1.8 kg
Terminals
Captive universal terminal screws with sems plates accept wire sizes of 14 gauge or smaller. The screws can withstand 10
in-lbs of tightening torque without damage.
Accessories
MOD400R
RA400Z
Sensitivity Test Module
Remote Annunciator
RTS451/RTS451KEY
PA400
Remote Test Station, test & reset switch with alarm LED
Piezo Sounder
APA451
Annunciator with piezo, alarm & power LEDs
Replacement Air Filter (two per package)
Replacement Test Magnet
Replacement End Plug for inlet sampling tube
Replacement Calibrated Test Card (For photo units only)
Replacement Screen, Photo
F36-05-00
M02-04-00
P48-21-00
R59-18-00
RS24
A2650-01
Replacement Installation Kit (mounting hardware)
Sampling (Inlet) Tubes
TUBE
ST-1.5
ST-3
OUTSIDE DUCT WIDTH
1 to 2 feet
2 to 4 feet
4 to 8 feet
(0.3 to 0.6 m)
(0.6 to 1.2 m)
(1.2 to 2.4 m)
ST-5
ST-10
8 to 12 feet (2.4 to 3.7 m)
Exhaust Tube Extension
A2440-00
5.75 in. (14.6 cm.) additional
D400-13-00
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Electrical Specifications
Power supply voltage:
Input capacitance:
20-29 VDC
270 µF max.
3.0 VDC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec.max.
2 to 17 sec.
24 VAC 50-60-Hz
270 µF max.
2.0 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
120 VAC 50-60 Hz 220/240 VAC 50-60 Hz
N/A
N/A
Reset voltage:
10 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
See head label
20 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
See head label
Reset time (with RTS451):
Reset time (by power down):
Power up time:
Alarm response time:
Sensitivity Test:
See head label
See head label
Electrical Ratings
Power Supply Voltage
20 - 29 VDC
24 VAC 50 - 60 Hz
120 VAC 50 - 60 Hz
220/240 VAC 50 - 60 Hz
CURRENT REQUIREMENTS (USING NO ACCESSORIES)
Max. standby current
25 mA
95 mA
35 mA AC avg.
55 mA AC avg.
20 mA AC avg.
55 mA AC avg.
20 mA AC avg.
30 mA AC avg.
Max. alarm current
CONTACT RATINGS
ACCESSORY CURRENT LOADS AT 24 VDC
Alarm initiation contacts (SPST)
Alarm auxiliary contacts (DPDT)
2.0A @ 30 VAC/DC (0.6 power factor)
ALARM
DEVICE
APA451
PA400
STANDBY
12mA MAX
0mA
30mA MAX
15mA MAX
10mA MAX
10mA MAX*
10A @ 30 VDC
10A @ 250 VAC
RA400Z
0mA
RTS451/ RTS451KEY 0mA*
ANY COMBINATION OF ACCESSORIES MAY BE
USED SUCH THAT THE GIVEN CURRENT LOADS TOTAL:
Note: Alarm auxiliary contacts must switch 500 mA minimum at 24VDC. Alarm auxiliary contacts shall not be
connected to inititaing circuits of control panels. Use the alarm initiation contact for this purpose.
100mA OR LESS IN THE STANDBY STATE,
150mA OR LESS IN THE ALARM STATE.
*NOTE: WHEN INITIATING AN ALARM, THE RTS451/
RTS451KEY REQUIRES 95 mA MAXIMUM IN
PRE-ALARM AND 103 mA MAXIMUM IN ALARM.
NOMINAL STANDBY CURRENT IS 0mA. ALARM
CURRENT IS 10 mA MAXIMUM WHEN TEST
MAGNET IS REMOVED.
Trouble contacts (SPST)
0.3A @ 32 VDC (resistive)
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
RA #__________, 3825 Ohio 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 inci-
dental damages for breach of this or any other Warranty, expressed or implied what-
soever, 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.
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 num-
ber, send defective units postage prepaid to: System Sensor, Repair Department,
D400-13-00
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I56-555-09R
NOTES
D400-13-00
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NOTES
D400-13-00
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DETECTOR TEST LOG
Detector Identification Information
Manufacturer and
Serial
Date
Detector Model:______________________ Number:______________________ Installed: ___________________
Description of Detector Location:
________________________________________________________________________________________________
________________________________________________________________________________________________
________________________________________________________________________________________________
Test Results and Maintenance Data
Date
Tested
Test
Description
Test
Results
Maintenance
Performed
Comments
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D400-13-00
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I56-555-09R
© System Sensor 1997
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