INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH400ACDC Air Duct Smoke Detector
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read the System Sensor Guide for Proper
Use of Smoke Detectors in Duct Applications (I56-473),
which provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. Copies
of this manual are available 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.
Table of Contents Page
[1] General Description 1
[2] Exploded View of Duct Detector Components 2
[3] Contents of the Duct Detector Kit 2
[4] Limitations of Duct Detectors 2
[5] Installation Sequence 2
[6] Duct Detector Maintenance and Test Procedures 8
[7] Detector Cleaning Procedures 10
[8] Specifications 12
Warranty 13
Detector Test log 16
List of Tables and Figures Page
Fig. 1: Duct Detector Exploded View 2
Fig. 2: Installation of Sampling Tube Gaskets 3
Fig. 3: Mounting Location of Speed Nuts 3
Table 1: Inlet Sampling Tube Selection 3
Fig. 4: Inlet Sampling Tube 4
Fig. 5: Sampling Tube Mounting Configurations 4
Fig. 6: Wiring Diagram 6
Fig. 7: Wiring Diagram – No Control Panel 7
Fig. 8: Wiring Diagram – Accessories 8
Fig. 9: Sampling Tube Filter Installation 8
Fig. 10: Testing Detector Alarm 9
Fig. 11: Detector Head Removal 9
Fig. 12: RTS451/RTS451KEY Test Coil Installation 10
Fig. 13: Photo Head Exploded View 11
Fig. 14: Ion Head Exploded View 11
[1] 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.
Model DH400ACDC Air Duct Smoke Detectors are supplied
with model 1451DH ionization detector heads or model
2451 photoelectronic detector heads. 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. These actions can facilitate the
management of toxic smoke and fire gases throughout the
areas served by the duct system.
DH400ACDC 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 functions. These detectors are not designed for 2-wire application.
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.
The detector can be reset by a momentary power interruption, by the magnet activated reset switch, or by the optional remote test station.
D400-13-00 1 I56-555-08
[2] Figure 1. Exploded view of duct detector components:
CONDUIT HOLES
FOAM
GASKETS
TUBE
PLUG
DETECTOR BASE
HOUSING
MOUNTING SCREWS
FILTER ADAPTER
TEST MAGNET
END
INLET SAMPLING TUBE
(SUPPLIED SEPARATELY)
EXHAUST
DETECTOR HEAD
O-RINGS
SAMPLING TUBE
FILTERS
[3] Contents Of The Duct Detector Kit
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 O-rings
7. Two rubber tube bushing seals
8. Four #6 self-tapping mounting screws for the sampling
and optional exhaust tube extension
9. One filter adapter
10.One inlet tube end plug
11.Two #10 speed nuts
NOTE: The inlet sampling tube must be ordered sepa-
rately. It must be the correct length for the width of
the duct where it will be installed. See Table 1 on
page 4 to determine the inlet tube required for different duct widths.
[4] Limitations Of Duct Detectors
WARNING
The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DETECTOR PROTECTION as a
means of providing life safety. Nor are they a substitute for
early warning in a building’s regular fire detection system.
DUCT DETECTOR
HOUSING
TERMINAL STRIP
PC BOARD
INSULATOR
DUCT DETECTOR
COVER
SAMPLING TUBE
MOUNTING
SCREWS
A78-1927-01
WARNING
This device will not operate without electrical power.
Frequently, fire situations may cause an interruption of
power. The system safeguards should be discussed with
your local fire protection specialist.
WARNING
This device does not sense smoke unless the ventilation
system is operating.
CAUTION
For this detector to function properly, it MUST be installed
according to the instructions in this manual. Furthermore,
the detector MUST be protected from the elements and operated within ALL electrical and environmental specifications listed in this manual. Failure to comply with these
requirements may prevent the detector from activating
when smoke is present in the air duct.
[5] Installation Sequence
Step Page
[5.1] Verify duct air flow direction and velocity 2
[5.2] Drill the mounting holes 3
[5.3] Secure the detector housing to the duct 3
[5.4] Install the sampling tube 3
[5.5] Complete the field wiring 5
[5.6] Install the filters and check pressure differential 8
[5.7] Perform detector check 8
[5.8] Install the cover 8
System Sensor supports this position and strongly recommends that the user read NFPA Standards 90A, 72, and 101.
The DH400ACDC Air Duct Smoke Detectors are listed per
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH400ACDC detectors are designed to be used in air
handling systems having air velocities of 500 to 4000 feet
UL 268A.
D400-13-00 2 I56-555-08
per minute. 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.
[5.2] Drill The Mounting Holes
Remove the paper backing from the mounting template
supplied. Affix the template to the duct at the desired
mounting location. Make sure the template lies flat and
smooth on the duct. Center punch holes A and B. 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 3.)
[5.3] Secure The Detector Housing To The Duct
Remove the duct housing cover. Slide the foam gaskets over
the tube bushings as shown in Figure 2. Make sure the two
small holes in the gaskets line up with the two base 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
screw the detector housing to the duct. CAUTION: Do not
overtighten the screws.
Figure 2. Installation of foam gaskets over sampling
tube bushings:
DUCT DETECTOR
HOUSING
EXHAUST TUBE
(EXTENSION BUSHING)
FOAM GASKETS
MOUNTING
SCREWS
O-RINGS
INLET SAMPLING
TUBE BUSHING
of air inlet holes on the tube. This tube must be purchased
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
A2440-00 Exhaust Tube Extension is available as an accessory in those cases where the molded exhaust port does not
extend at least 2 inches into the duct.
The inlet tube is always installed in the centermost housing
bushing, with air inlet holes facing into the air flow. To assist proper installation, the tube’s mounting flange is
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
with respect to air flow.
Mounting the detector housing in a vertical orientation is
acceptable, provided that the air flows directly into the
sampling tube holes as indicated in Figure 4.
Table 1. Inlet tubes required for different duct
widths:
Outside Duct Width Inlet Tube Required
1 to 2 ft. ST-1.5
2 to 4 ft. ST-3
4 to 8 ft. ST-5
8 to 12 ft. ST-10
SCREW HOLES FOR ATTACHING
DETECTOR HOUSING TO DUCT
A78-2045-00
Figure 3. Speed nut mounting location:
HOLE B
HOLE A
DUCT
WALL
SPEED
NUT
78-2046-00
[5.4] Install The Inlet
The inlet tube (shown in Figure 4) is identified by a series
D400-13-00 3 I56-555-08
Figure 4. Air duct detector inlet sampling tube:
FLANGE
AIR HOLES
ARROWS
AIR FLOW DIRECTION
MUST FACE
INTO AIR FLOW
Figure 5. Tube mounting configurations with varying air flow direction:
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DUCT
DETECTOR
HOUSING
EXHAUST
TUBE
EXHAUST
TUBE
INLET
TUBE
INLET
TUBE
EXHAUST
TUBE
AIR FLOW
DIRECTION
INLET
TUBE
INLET
TUBE
END
PLUG
AIR FLOW
DIRECTION
DUCT
DETECTOR
HOUSING
A78-2047-00
DUCT
DETECTOR
HOUSING
AIR FLOW
DIRECTION
[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 inlet
tube as shown in Figure 4. Sampling tubes over 3 ft. long
must be supported at the end opposite the duct detector.
2. Slide the tube into the centermost housing bushing. Position the tube so that the arrows point into the air flow.
3. Secure the tube flange to the housing bushing with two
#6 self-tapping screws.
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
outside the duct. Plug this end with the end plug and
DUCT
DETECTOR
HOUSING
EXHAUST
TUBE
INLET
TUBE
A78-1812-01
tape closed any holes in the protruding section of the
tube. Be sure to seal the duct when the tube protrudes.
WARNING
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.
[5.4.2] 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
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.
D400-13-00 4 I56-555-08
Install the inlet tube as follows:
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 with the flange into the centermost
housing bushing. Position the tube so that the arrows
point into the air flow. Secure the tube flange to the
housing bushing with two #6 self-tapping screws.
3. From inside the duct, couple the other section of the in-
let 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 and facing into
the air flow.
4. Trim the end of the tube protruding through the duct so
that 1 to 2 inches of the tube extend 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.
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 electrical tape to close off
some of the sampling holes so that there is a total
of 10 to 12 holes spaced as evenly as possible
across the width of the duct.
[5.5] Field Wiring
Wiring Installation Guidelines
All wiring must be installed in compliance with the National Electrical Code and the local codes having jurisdiction. Proper wire gauges should be used. 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 usually
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 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.
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 particular model control
panel being used before wiring the detector loop.
Air currents inside the duct may cause excessive vibration,
especially when the longer sampling tubes are used. In
these cases a 3 inch floor flange (available at most plumbing supply stores) may be used to fasten the sampling tube
to the other side of the duct. When using the flange/connector mounting technique, drill a 1 inch to 1-1/4-inch hole
where the flange will be used.
[5.4.3] Modifications Of Inlet Sampling Tubes
There may be applications where duct widths are not what
is 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.
Wiring Instructions
The DH400ACDC detectors are designed for easy wiring.
The housing provides a terminal strip with clamping plates.
Wiring connections are made by stripping about 3/8-inch
of insulation from the end of the wire, sliding the bare end
under the plate, and tightening the clamping plate screw.
The DH400ACDC duct detector is designed to operate from
24 VDC, 24 VAC, 120 VAC, or 240 VAC.
The detector may be wired for interconnection to UL listed
control panels, or for stand alone service per NFPA 90A.
Refer to the wiring diagrams of Figures 6, 7, and 8 to select
the appropriate circuit for your application.
D400-13-00 5 I56-555-08
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.
EOL RESISTOR
SPECIFIED BY
PANEL MANUFACTURER
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
MANUFACTURER'S
INSTALLATION INSTRUCTIONS
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR. SEE
SPECIFICATIONS FOR
ADDITIONAL POWER SUPPLY
INFORMATION.
VAC
220/240
120
VAC
OR CONTACT MANUFACTURER.
N.C.C.N.O.N.O.C.N.C.
18 19 20
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
8
9
AVAILABLE POWER INPUTS
AVAILABLE POWER INPUTS
24V
1 2 12 13 14
120
VAC
24V
1 2 12 13 14
ALARM AUXILIARY CONTACTS
VAC
220/240
FOR FAN SHUTDOWN, ETC.
15 16 17
N.C.C.N.O.N.O.C.N.C.
18 19 20
FOR FAN SHUTDOWN, ETC.
ALARM AUXILIARY CONTACTS
15 16 17
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
TROUBLE CONTACTS
ALARM AS INDICATED BY THE ARROWS.
TROUBLE CONTACTS
11 10 11 10
ALARM AS INDICATED BY THE ARROWS.
SIGNAL TROUBLE CONDITION TO PANEL.
REMOVED, AND DURING RESET. OPEN CONTACTS
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
8
SIGNAL TROUBLE CONDITION TO PANEL.
REMOVED, AND DURING RESET. OPEN CONTACTS
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
ALARM
INITIATION
CONTACTS
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
9
ALARM
INITIATION
CONTACTS
LAST DETECTOR IN THE LOOP
DH400ACDC
FIRST DETECTOR IN THE LOOP
DH400ACDC
ALARM
INITIATION
LOOP
UL LISTED
CONTROL PANEL
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50-60 HZ,
120 VAC 50-60 HZ, OR
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
AUX. CONTACT RATINGS
10A @ 30 VDC
10A @ 250 VAC
500mA MINIMUM @ 24 VDC
NOT INTENDED FOR
CONNECTION TO CONTROL
PANELS.
TROUBLE CONTACT RATING
0.3 A @ 32 VAC/DC
A78-2352-01
D400-13-00 6 I56-555-08
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
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
ALARM AUXILIARY CONTACT RATINGS
10A @ 30 VDC
10A @ 250 VAC
500mA MINIMUM @ 24 VDC
NOT INTENDED FOR CONNECTION
TO CONTROL PANELS.
ALARM INITIATION CONTACT RATING
2.0A @ 30 VAC/DC (0.6 POWER FACTOR)
SEE SPECIFICATIONS FOR
ADDITIONAL POWER
SUPPLY INFORMATION.
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
MANUFACTURER’S
INSTALLATION INSTRUCTIONS
OR CONTACT MANUFACTURER.
1 2 12 13 14
24V
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
15 16 17
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
ALARM INITIATION CONTACTS
8
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.
120
VAC
220/240
VAC
18 19 20
N.O.
N.C.C.N.O.N.O.C.N.C.
9
2 ALARM
COMMON
RED
GRN.
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.
APA451
1
FIELD
INSTALLED
JUMPER
POWER3
5
6
7
10
11
(+) ALARM SIGNAL
(–) AUX POWER
(+) AUX POWER
TROUBLE
CONTACTS
DH400ACDC
DUCT DETECTOR
TROUBLE CONTACT RATING
0.3A @ 32 VAC/DC
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.
A78-2353-02
D400-13-00 7 I56-555-08
Figure 8. Wiring diagrams for optional accessories (see Figure 7 for APA451 wiring diagram):
ALARM SIGNAL (+)
AUX POWER (–)
DUCT DETECTOR
DH400ACDC
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400Z
RTS451/RTS451KEY
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.
5
6
STANDBY
12mA MAX
0mA
0mA
0mA*
(+)
(–)
PA400 (OPTIONAL)
AUDIBLE ALERT
ALARM
30mA MAX
15mA MAX
10mA MAX
10mA MAX*
ALARM SIGNAL (+)
AUX POWER (–)
DUCT DETECTOR
DH400ACDC
[5.6] Install The Filters
To install the sampling tube filters, simply push the filter
adapter into the exhaust tube, and push the filter onto the
adapter tube on the left, as shown in Figure 9. Install the
other filter over the end of the inlet sampling tube.
Figure 9. Sampling tube filter installation:
INLET SAMPLING TUBE
5
6
(+)
RED
(–)
RA400Z (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
ALARM SIGNAL (+)
AUX POWER (–)
RESET (–)
TEST (–)
DUCT DETECTOR
DH400ACDC
5
6
FIELD
INSTALLED
3
JUMPER
4
RTS451/RTS451KEY
(OPTIONAL) REMOTE
TEST STATION
1
2
4
3
5
RESET
TEST
R
E
D
[5.7] Perform Detector Check
1. Perform the STANDBY AND TROUBLE TEST per Section
[6.2.1].
2. Perform the MAGNET TEST per Section [6.2.2.1]. The
RTS451 test of Section [6.2.2.2] may substitute for this
requirement.
3. Perform the AIR FLOW TEST per Section [6.1.1].
4. Perform the SMOKE RESPONSE TEST per Section
[6.1.2].
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.
A78-2354-00
FOAM GASKET
DETECTOR BASE
SAMPLING TUBE
MOUNTING
SCREWS
[5.8] Install The Cover
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
EXHAUST
FILTER ADAPTER
DETECTOR HEAD
SAMPLING TUBE
FILTERS
A78-2106-01
groove and that all gaskets are in their proper positions.
Tighten the four screws to 10 in-lbs.
[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 as-
CAUTION
Filters require periodic cleaning or replacement, depending
sist maintenance personnel in verification of proper detector operation.
on the amount of dust and dirt accumulated. Visually inspect 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-
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.
haust tube/intake tube filter P/N F36-05-00).
After conducting these tests, record the appropriate information in the Detector Test Log at the end of this manual.
D400-13-00 8 I56-555-08
Figure 10. Testing detector alarm: Figure 11. Detector head removal:
DETECTOR
HEAD
DUCT
HOUSING
DETECTOR
HEAD
TWIST
COUNTERCLOCKWISE
TO REMOVE
TEST
LOCATOR
TEST
MAGNET
PAINTED SIDE
TOWARD HOUSING
RESET
LOCATOR
A78-2138-00 A78-2139-00
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
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.
[6.1.2] Smoke Response
To determine if smoke is capable of entering the sensing
chamber, visually identify any obstructions. Plug the exhaust and inlet tube holes to prevent ducted air from carrying 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.
[6.1.3] 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 should
be replace because only a high percentage of contamination affects duct detector performance.
[6.2] Standby, Alarm, And Sensitivity Tests
[6.2.1] Standby And Trouble
Standby- Check for the presence of the blinking red LEDs
(blinks about every 10 seconds) through the
transparent housing cover. If the APA451 accessory is used, its green Power LED should be illuminated continuously.
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
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 defective (return for repair).
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 M0204-00 magnet into the Reset locator, as shown in
Figure 10. These actions should cause a trouble
condition locally and at the system control
panel.
[6.2.2] Alarm Tests
[6.2.2.1] M02-04-00 Magnet Test
1. Place the painted surface of the magnet into the Test lo-
cator molded into the side of the housing (see Figure
10).
2. The red alarm LEDs on the detector should latch on, as
should any accessories (PA400, RA400Z, RTS451,
APA451). Verify auxiliary functions (such as fan shutdown) and system control panel alarm status.
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.
[6.2.2.2] RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates test
D400-13-00 9 I56-555-08
Figure 12. RTS451/RTS451KEY test coil installation:
TEST COIL
DETECTOR
HEAD
A78-1994-02
of the alarm capability of the duct detector as indicated in
the RTS451/RTS451KEY manual. The DH400ACDC duct detector can be reset by the RTS451/RTS451KEY. If a system
control panel is used, the panel itself may also require resetting.
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 housing 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.
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].
[6.2.3.2] R59-18-00 CALIBRATED TEST CARD (photoelectronic units only)
After verification of alarm capability, the R59-18-00 test
card may be used to verify correct sensitivity of the detector head.
1. Remove the duct housing cover.
2. Remove the detector head from the housing as shown in
Figure 11.
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 counterclockwise.
4. Carefully reinsert the detector head into the duct housing 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.
[7] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector system 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.
[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.
[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 remove (see Figure 13).
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
D400-13-00 10 I56-555-08
Figure 13. Photo head exploded view:
REMOVABLE HEAD COVER
TEST SLOT
CLEANABLE SCREEN
Figure 14. Ion head exploded view:
REMOVABLE
COVER
FOR
CLEANING
REMOVABLE SCREEN
(P/N RS14)
P/N RS24 (W/O THERMAL)
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
A78-1213-01
screens (RS24) are available.
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.
[7.3] Ion Heads
1. Remove the detector cover by depressing the three lock
prongs on the top of the cover and rotating the cover
counterclockwise to remove the cover and screen assembly (see Figure 14). The optional CRT400 Cover Removal
Tool makes cover removal easier.
2. Carefully pull the screen out of the cover.
3. Clean the screen thoroughly with a soft brush or
vacuum. Replacement screens (RS14) are available.
4. Brush or vacuum the inside of the cover. The cover may
then be blown out with clean, compressed air.
5. Vacuum the sensing chamber before using clean, compressed air to loosen and blow out any remaining debris.
6. Press the screen back into the cover.
7. Replace the detector cover onto the sensing chamber.
Rotate it clockwise to lock it into place.
LOCK PRONG
SENSING CHAMBER
A78-2340-00
[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.
D400-13-00 11 I56-555-08
[8] Model DH400ACDC Air Duct Smoke Detector Specifications
Description
HVAC air duct mounted ionization or photoelectronic smoke detector for separately powered systems or stand alone systems. 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: 10% to 93% R.H. non-condensing
Air Velocity: 500 to 4000 Ft/min.
1.5 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: 5 inches 13 cm
Depth (installed): 4 inches 10 cm
Weight: 4 pounds 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 Sensitivity Test Module
RA400Z Remote Annunciator
RTS451/RTS451KEY Remote Test Station, test & reset switch with alarm LED
PA400 Piezo Sounder
APA451 Annunciator with piezo, alarm & power LEDs
CRT400 Cover Removal Tool (Ion only)
F36-05-00 Replacement Air Filter (two per package)
M02-04-00 Replacement Test Magnet
P48-21-00 Replacement End Plug for inlet sampling tube
R59-18-00 Replacement Calibrated Test Card (For photo units only)
RS14 Replacement Screen, Ion
RS24 Replacement Screen, Photo
A2650-01 Replacement Installation Kit (mounting hardware)
Sampling (Inlet) Tubes
TUBE OUTSIDE DUCT WIDTH
ST-1.5 1 to 2 feet (0.3 to 0.6 m)
ST-3 2 to 4 feet (0.6 to 1.2 m)
ST-5 4 to 8 feet (1.2 to 2.4 m)
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 12 I56-555-08
Electrical Specifications
Power supply voltage: 20-29 VDC 24 VAC 50-60-Hz 120 VAC 50-60 Hz 220/240 VAC 50-60 Hz
Input capacitance: 270 µF max. 270 µF max. N/A N/A
Reset voltage: 3.0 VDC min. 2.0 VAC min. 10 VAC min. 20 VAC min.
Reset time (with RTS451): .03 to 0.3 sec. .03 to 0.3 sec. .03 to 0.3 sec. .03 to 0.3 sec.
Reset time (by power down): 0.6 sec. max. 0.6 sec. max. 0.6 sec. max. 0.6 sec. max.
Power up time: 34 sec.max. 34 sec. max. 34 sec. max. 34 sec. max.
Alarm response time: 2 to 17 sec. 2 to 17 sec. 2 to 17 sec. 2 to 17 sec.
Sensitivity Test: See head label See head label 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 35 mA AC avg. 20 mA AC avg. 20 mA AC avg.
Max. alarm current 95 mA 55 mA AC avg. 55 mA AC avg. 30 mA AC avg.
CONTACT RATINGS
Alarm initiation contacts (SPST) 2.0A @ 30 VAC/DC (0.6 power factor)
Alarm auxiliary contacts (DPDT) 10A @ 30 VDC
10A @ 250 VAC
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400Z
RTS451/ RTS451KEY
STANDBY
12mA MAX
0mA
0mA
0mA*
ALARM
30mA MAX
15mA MAX
10mA MAX
10mA MAX*
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.
Trouble contacts (SPST) 0.3A @ 32 VDC (resistive)
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 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.
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 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.
D400-13-00 13 I56-555-08
NOTES
D400-13-00 14 I56-555-08
NOTES
D400-13-00 15 I56-555-08
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
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
_______ __________ _______ ____________ ___________________________
D400-13-00 16 I56-555-08
© System Sensor 1997
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