System Sensor DH100ACDC User Manual
2. Vacuum sensing chamber before using clean, compressed air to loosen and blow out any remaining debris.
[8.2] Power Board replacement
1. Disconnect wiring from the terminal block.
2. Remove the two power board mounting screws.
[8.0] Board Replacement
[8.1] Detector Board Replacement
1. Remove the two detector board mounting screws.
2. Pull gently on the board to remove it.
3. To replace the board, align the board mounting fea-
tures, holes, and the interconnect terminals. Push the
3. Pull gently on the board to remove it.
4. To replace the board, align the board mounting features, holes, and the interconnect terminals. Push the
board into place.
5. Secure board with the two mounting screws.
6. Re-connect wiring to terminal block.
board into place.
4. Secure board with the two mounting screws.
[9] Model DH100ACDC Air Duct Smoke Detector Specifications
Temperature:
DH100ACDCP 32° to 131° F0° to 55° C
DH100ACDCI 32° to 120° F0° to 49° C
Humidity: 10% to 93% R.H. noncondensing
Air Velocity: 500 to 4000 ft./min. 2.5 to 20.3 m/sec.
Dimensions: 14.38″ L x 5.5″ W x 2.75″ D 37cm L x 14cm W x 7cm D
Weight: 3.75 pounds 1.7 kg
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 detector label See detector label See detector label See detector label
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 15 mA 35 mA RMS 25 mA RMS* 15 mA RMS*
Max. alarm current 70 mA 125 mA RMS 35 mA RMS* 25 mA RMS*
CONTACT RATINGS
Alarm initiation contacts (SPST) 2.0A @ 30 VDC (resistive)
Alarm auxiliary contacts (DPDT) 10A @ 30 VDC
Note: Alarm auxiliary contacts must switch 100 mA minimum at 5VDC. Alarm auxiliary contacts shall not be
connected to inititaing circuits of control panels. Use the alarm initiation contact for this purpose.
Trouble contacts (SPDT) 2.0A @ 30 VDC (resistive)
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:
D100-68-00 8 I56-1147-07
10A @ 250 VAC
Three-Year Limited Warranty
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.
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400Z
RTS451/ RTS451KEY
* NOTE: When a unit is powered at the 120VAC or 220/240VAC input, any
combination of accessories may be used such that the given accessory loads are:
60 mA or less in the standby state,
110 mA or less in the alarm state.
STANDBY
12.5mA Max.
0mA
0mA
12mA
ALARM
30mA Max.
15mA Max.
10mA Max.
7.5mA Max.
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
DH100ACDC Air Duct Smoke Detector
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
tacts are available for control panel interface (alarm initiation), HVAC control, and other auxiliary functions. Auxiliary
relays are also provided for fan shut down or signaling of up
to 9 other detectors in the loop for multiple fan shut down.
These detectors are not designed for 2-wire applications.
1-800-SENSOR2, FAX: 630-377-6495
manual are available from System Sensor. NFPA Standards 72
and 90A should also be referenced for detailed information.
For testing, the alarm can be enabled by a magnet acti-
vated test switch or by the optional remote test station.
NOTICE: This manual should be left with the owner/user
of this equipment.
The duct smoke detector latches into alarm state when an
alarm occurs. A green LED flashes to indicate power, a
red LED signals local alarm indication, and optional acIMPORTANT: This detector must be tested and maintained
cessories offer a variety of annunciation capabilities.
regularly following NFPA 72 requirements. The detector
should be cleaned at least once a year.
The DH100ACDC can be reset by a momentary power in-
terruption, the reset button on the front cover, the control
Table of Contents Page
[1] General Description 1
[2] Limitations of Duct Smoke Detectors 1
[3] Exploded View of Duct Smoke Detector Components 2
[4] Contents of the Duct Smoke Detector Kit 2
[5] Installation Sequence 2
[6] Duct Smoke Detector Maintenance and Test Procedures 5
[7] Detector Cleaning Procedures 7
panel, or remote reset accessory.
[2] Limitations Of Duct Smoke Detectors
WARNING
The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A SUB-
STITUTE 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.
[8] Board Replacement 8
[9] Specifications 8
Warranty 8
System Sensor supports this position and strongly recommends
that the user read NFPA Standards 90A, 72, and 101. The
DH100ACDC Air Duct Smoke Detectors are listed per UL 268A.
[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 DH100ACDC Air Duct Smoke Detectors are supplied
as an ionization model or photoelectronic model. 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, 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.
This device will not operate without electrical power.
Fire situations may cause an interruption of power. The
system safeguards should be discussed with your local fire
protection specialist.
This device will not sense smoke unless the ventilation sys-
tem is operating and the cover is installed.
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 op-
erated within ALL electrical and environmental specifica-
tions listed in this manual. Failure to comply with these
requirements may prevent the detector from activating
when smoke is present in the air duct.
WARNING
WARNING
WARNING
DH100ACDC detectors are designed to operate on 24 VDC/
VAC, 120 VAC, or 240 VAC. Alarm and supervisory relay con-
D100-68-00 1 I56-1147-07
[3] Figure 1: Exploded View Of Duct Smoke Detector Components
FOAM
GASKETS
CONDUIT HOLES
DETECTOR
HOUSING
Figure 10. Wiring diagrams for optional accessories (see page 6 for APA451 wiring diagram):
ALARM SIGNAL (+)
AUX POWER (–)
15
20
(+)
ALARM SIGNAL (+)
AUX POWER (–)
(–)
15
20
(+)
RED
(–)
TELESCOPING TUBE
TELESCOPING TUBE
SELF-TAPPING SCREW
DETECTOR BOARD
SAMPLING TUBE
FILTERS
DETECTOR
COVER
COVER MOUNTING
SCREWS
[4] Contents Of The Duct Smoke Detector Kit
1. Complete housing base and cover assembly
2. Two #10 machine screws for mounting
3. Two sampling tube filters
4. One test magnet
5. Drilling template
6. Two foam gaskets
7. Four #6-self tapping mounting screws for the metal
sampling tube and optional exhaust tube extension
8. Two jack nuts
9. One inlet tube end plug
10. One telescoping sampling tube
11. One #8 self-tapping screw for the telescoping sampling
tube
NOTE: For ducts over 11/2 feet, longer inlet sampling tubes
must be ordered to complete the installation. They
must be the correct length for the width of the duct
where they will be installed. See Table 1 on page 3
to determine the inlet tube required for different
duct widths.
[5] Installation Sequence
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH100ACDC detectors are designed to be used in air
handling systems having air velocities of 500 to 4000 feet
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
TERMINAL STRIP
POWER BOARD
Tube Installation Chart:
Supplemental Duct
Tube Holes Width
512″-14″
614″-16″
716″-18″
smooth on the duct. Center punch holes A and B. Drill the
holes as indicated on the template. Insert the two jack nut
receptacles. Drive a #10 machine screw into jacket to flare
the retainer, then back out the screw to use for detector
mounting.
[5.2.1] Sampling Tube Installation for Ducts Less
Than 11/2 Feet Wide (see Figure 2)
1. Remove the front cover.
2. Use the tube installation chart above to determine the
set screw setting.
3. Slide the sampling tube into the housing bushing.
4. Align the holes in the bushing with the holes in the
sampling tube. Make sure the number of exposed holes
on the supplemental tube matches the number as determined in step 2. Secure with the #8 self-tapping screw
into the bottom of the permanent tube.
NOTE: For ducts greater than 11/2 feet in width, refer to
sections [5.4.1] and [5.4.2].
Figure 2. Sampling tube connected to duct smoke
detector:
[5.3] Secure The Detector Housing To The Duct
Slide the foam gaskets over the tube bushings as shown in
Figure 3. Use the two machine screws to screw the detector
DUCT DETECTOR
DH100ACDC
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400Z
RTS451/RTS451KEY
When a unit is powered at the 120VAC or 220/240VAC input,
any combination of accessories may be used such that the given
accessory loads are:
60mA or less in the standby state,
110mA or less in the alarm state.
STANDBY
12.5mA Max.
0mA
0mA
12mA Max.
PA400 (OPTIONAL)
AUDIBLE ALERT
ALARM
30mA Max.
15mA Max.
10mA Max.
7.5mA Max.
Figure 11. Testing detector alarm:
A78-2325-00
[6.2.2.2] RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates
test of the alarm capability of the duct smoke detector
as indicated in the RTS451/RTS451KEY manual. The
DH100ACDC duct smoke detector can be reset by the
RTS451/RTS451KEY. If a system control panel is used,
the panel itself may also require testing.
To install the RTS451/RTS451KEY, connect the device as
shown in Figure 9; wire runs must be limited to 25 ohms or
less per interconnecting wire.
[6.2.3] Sensitivity Tests
[6.2.3.1] MOD400 or MOD400R Test
After verification of alarm capability, use the MOD400R test
module with a voltmeter to check detector sensitivity as indicated in the test module’s manual. The housing cover
must be removed to perform this test.
DUCT DETECTOR
DH100ACDC
RA400Z (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
A78-2354-05
If test module readings indicate that the detector head is
outside of the acceptable range that is printed on the label
of the detector, the detector chamber requires cleaning per
Section [7] of this manual.
[7] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector system is undergoing maintenance, and that the system will
temporarily be 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 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
reinstall the filters.
[7.2] Photo Detector Boards
1. Remove the screen by gently grasping on each side and
pulling straight off.
2. Lift the photo chamber in the same fashion. Vacuum the
screen and cover. Use clean, compressed air to loosen
and blow out any remaining debris. Replacement
screens (S08-39-01) are available.
3. Vacuum photo chamber, then use clean compressed air
to blow area clean.
4. Replace the chamber by pressing it onto the base.
Press the screen into place. It should fit tightly on the
chamber.
[7.3] Ion Detector Boards
1. Brush or vacuum inside area of cover. Chamber may
then be blown out using clean, compressed air.
D100-68-00 2 I56-1147-07
D100-68-00 7 I56-1147-07
Loading...