Hochiki DUCT SMOKE DETECTOR Installation Instructions
Hochiki DUCT SMOKE DETECTOR is engineered to detect smoke in ventilation ducts, helping protect people and property from fire hazards. It features customizable duct housing options for various smoke sensor types, including ionization, photoelectric, and analog sensors. The detector enables flexible duct mounting and sampling tube orientations to suit different duct configurations. It offers visual LED indicators for alarm and trouble conditions, aiding in quick identification of system status.
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HOCHIKI AMERICA CORPORATION
7051 Village Drive Suite 100 * Buena Park, CA 90621-2268
Phone: 714/522-2246 * Fax: 714/522-2268
Technical Support: 800/845-6692 or [email protected]
II. MOUNTING THE DETECTOR
The sampling tubes may be ordered to a desired length or ordered in one of 3 standard
lengths and cut per requirements. The intake sampling tube consists of a piece of steel
piping with a series of holes drilled the entire length of the tube and should extend the
entire width of the duct. The holes must be facing into the air flow (see Figure 2). The
exhaust tube consists of a piece of steel piping approximately 7-1/2" long.
1. Remove paper backing from mounting template AP 121 (packaged in installation kit) and affix to duct at desired
location.
2. Using template as a guide, drill 4 mounting holes (3/32" diameter) for duct mounting screws (4 #12 x 1/2" sheet
metal screws packaged in installation kit). Drill or punch holes for sampling tubes in air ducts (1-3/8" diameter), using
template as a guide. Clean all holes.
Duct Smoke Detector Location Requirements: To prevent false alarms the detectors should not
be mounted in areas of extreme high or low temperatures, in areas where high humidity exist, or in
areas where duct air may contain gases or excess dust. The duct detector should, when possible, be
located a minimum of six duct widths downstream from a source of turbulence (bends, inlets, or
deflection plates). At these locations, air flow is less turbulent and the air/smoke mixture should be
more homogenous.Refer to NFPA 90A, 72, and 101 for more information. See Figure 1A and 1B.
Exception: Where it is physically impossible to locate the duct detector accordingly, the
duct detector can be positioned closer than six duct widths, but as far as possible from
inlets, bends, or deflection plates.
*These products are compatible exclusively with fire alarm control panels that utilize Hochiki's protocol, DCP.
These are Installation Instructions (DWG.# HA-06-073) for the DH-98/DH-99 Duct Housing customized as follows:
Duct Housing with the SIJ-24DH Conventional Ionization Smoke Detector
Duct Housing with the SLR-24DH Conventional Photoelectric Smoke Detector
High Voltage Duct Housing with the SIJ-24DH Conventional Ionization Smoke Detector
High Voltage Duct Housing with the SLR-24DH Conventional Photoelectric Smoke Detector
Duct Housing with the ALG-DH Analog Photoelectric Smoke Sensor*
Duct Housing with the ALG-DH Analog Photoelectric Smoke Sensor & Relays*
Duct Housing with the ALK-D Analog Photoelectric Smoke Sensor*
Duct Housing with the ALK-D Analog Photoelectric Smoke Sensor & Relays*
INSTALLATION INSTRUCTIONS FOR THE DUCT SMOKE DETECTOR
A. DUCT PREPARATION
The Duct Detectors are designed for use in ducts where the air velocities are from 300 to
4000 feet per minute. Verify this by checking specifications of installation and if necessary,
use an Alnor Model 6000P velocity meter (or equivalent) to check the air velocity. See
Figure 2 for sampling tube orientation to air flow direction.
DH-98-I
DH-98-P
DH-98-HVI
DH-98-HVP
DH-98-A
DH-98-AR
DH-99-A
DH-99-AR
FIGURE 1B: DUCT HOUSING MOUNTING
TOP OF DUCT HOUSING
NOTE: Any of the DH-98-I, DH-98-P, DH-98-HVI or the DH-98-HVP detectors may be placed into alarm by placing the magnet (HA Part #0700-01117) as shown in
Figure 6.
The SLR photoelectric detector has a built-in sensitivity window verification feature. If the detector is within its
calibrated sensitivity range the detector LEDs will flash Green in standby or normal operation. If the detector drifts
outside its sensitivity range the LEDs will flash Red to indicate an out of sensitivity condition.
With the duct housing cover removed, place the magnet (HA Part #0700-01117) on the detector as shown in
Figure 4 for approximately six (6) seconds. The detector should not alarm. Place the magnet on the opposite
side (Figure 5) for another six (6) seconds. The detector LEDs should illuminate and the duct housing should
go into alarm. This test will verify that the detector is within its intended limits.
1. With power source de-energized and the smoke detector not installed,
wire all connections per engineering drawings. Refer to the applicable
figures below depending on your duct housing model number.
2. With all wiring in place, install the detector head.
3. Energize the duct detector.
Wiring must conform to applicable local codes, ordinances and regulations covering these types of devices.
Wire the detectors according to the engineering drawings for the particular job requirements. These detectors
are not intended for open area protection, nor should they be used for open air protection. Refer to NFPA 90A
and NFPA 72 for general and additional information on Duct Smoke Detectors concerning operation and
installation. Terminals are suitable for up to #14 gauge wire.
To verify proper sampling of air, use a Dwyer Model 4000 differential pressure gauge (or
equivalent). See Figure 3 for gauge connections. The pressure differential between input
sampling tube and exhaust tube should be greater than 0.01" of water and less than 1.2" of water.
Move duct housing/sampling tube assembly to desired location. Use 4 mounting
screws (4 #12 x 1/2" sheet metal screws, packaged in installation kit) to secure the
housing to the air duct.
1. Sampling tube connectors are equipped with set screws, which allow the tubes to be
mounted only in directions shown in Figure 2. Establish proper orientation
considering airflow direction.
2. Insert intake and exhaust tubes into connectors, align set screw to set screw hole in
tubes and tighten firmly.
1. Cut the intake sampling tube to the desired length.
2. Firmly insert the stopper (packaged in installation kit) in the end of the INTAKE sampling tube.
INTAKE SAMPLING TUBES STANDARD LENGTHS:
Models DH-98-P and DH-98-HVP:
Models DH-98-I and DH-98-HVI:
III. ELECTRICAL INSTALLATION
FIG. 6 MAGNET PLACEMENT
POWER BEFORE SERVICING
VOLTAGE TERMINALS - DISCONNECT
REMOVAL OF COVER EXPOSES HIGH
ameri ca cor porati on
Smoke Detector
DH-98 Duct
FIG. 4 L.E.D.S
PILOTALARM RESET
TEST
DH-98-P
DH-98-I
DH-98-A
DH-98-AR
FIG. 5
FIG. 3 AIR SAMPLING
VERIFICATION
For duct widths of 1.0' to 2.5'
For duct widths of 2.5' to 5.0'
For duct widths of 5.0' to 10.0'
EXHAUST TUBE
HOLE &
CONNECTOR
LOW PRESSURE
SIDE
STS-2.5
STS-5.0
STS-10.0
DWYER #4000 DIFFERENTIAL
PRESSURE GAUGE (OR
EQUIVALENT) WITH TUBING
AND SIZE 0 RUBBER STOPPERS
(HA PART# 0700-01118).
HIGH PRESSURE
SIDE
INTAKE TUBE
HOLE &
CONNECTOR
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700-09887, Page 1 of 3) Specifications subject to change without notice. * August 2014
B. VERIFY AIR FLOW AND DIRECTION
C. SAMPLING TUBE ASSEMBLY (See Figure 2)
D. MOUNT SAMPLING TUBES (See Figure 2)
E. MOUNT THE DUCT HOUSING (See Figure 1B & 2)
F. VERIFY AIR SAMPLING (See Figure 3)
A. GENERAL INFORMATION
B. DETECTOR WIRING
C. TESTING THE INSTALLATION
I. LOCATION REQUIREMENTS
7051 Village Drive Suite 100 * Buena Park, CA 90621-2268
Phone: 714/522-2246 * Fax: 714/522-2268
Technical Support: 800/845-6692 or [email protected]
II. MOUNTING THE DETECTOR
The sampling tubes may be ordered to a desired length or ordered in one of 3 standard
lengths and cut per requirements. The intake sampling tube consists of a piece of steel
piping with a series of holes drilled the entire length of the tube and should extend the
entire width of the duct. The holes must be facing into the air flow (see Figure 2). The
exhaust tube consists of a piece of steel piping approximately 7-1/2" long.
1. Remove paper backing from mounting template AP 121 (packaged in installation kit) and affix to duct at desired
location.
2. Using template as a guide, drill 4 mounting holes (3/32" diameter) for duct mounting screws (4 #12 x 1/2" sheet
metal screws packaged in installation kit). Drill or punch holes for sampling tubes in air ducts (1-3/8" diameter), using
template as a guide. Clean all holes.
Duct Smoke Detector Location Requirements: To prevent false alarms the detectors should not
be mounted in areas of extreme high or low temperatures, in areas where high humidity exist, or in
areas where duct air may contain gases or excess dust. The duct detector should, when possible, be
located a minimum of six duct widths downstream from a source of turbulence (bends, inlets, or
deflection plates). At these locations, air flow is less turbulent and the air/smoke mixture should be
more homogenous.Refer to NFPA 90A, 72, and 101 for more information. See Figure 1A and 1B.
Exception: Where it is physically impossible to locate the duct detector accordingly, the
duct detector can be positioned closer than six duct widths, but as far as possible from
inlets, bends, or deflection plates.
*These products are compatible exclusively with fire alarm control panels that utilize Hochiki's protocol, DCP.
These are Installation Instructions (DWG.# HA-06-073) for the DH-98/DH-99 Duct Housing customized as follows:
Duct Housing with the SIJ-24DH Conventional Ionization Smoke Detector
Duct Housing with the SLR-24DH Conventional Photoelectric Smoke Detector
High Voltage Duct Housing with the SIJ-24DH Conventional Ionization Smoke Detector
High Voltage Duct Housing with the SLR-24DH Conventional Photoelectric Smoke Detector
Duct Housing with the ALG-DH Analog Photoelectric Smoke Sensor*
Duct Housing with the ALG-DH Analog Photoelectric Smoke Sensor & Relays*
Duct Housing with the ALK-D Analog Photoelectric Smoke Sensor*
Duct Housing with the ALK-D Analog Photoelectric Smoke Sensor & Relays*
INSTALLATION INSTRUCTIONS FOR THE DUCT SMOKE DETECTOR
A. DUCT PREPARATION
The Duct Detectors are designed for use in ducts where the air velocities are from 300 to
4000 feet per minute. Verify this by checking specifications of installation and if necessary,
use an Alnor Model 6000P velocity meter (or equivalent) to check the air velocity. See
Figure 2 for sampling tube orientation to air flow direction.
DH-98-I
DH-98-P
DH-98-HVI
DH-98-HVP
DH-98-A
DH-98-AR
DH-99-A
DH-99-AR
FIGURE 1B: DUCT HOUSING MOUNTING
TOP OF DUCT HOUSING
NOTE: Any of the DH-98-I, DH-98-P, DH-98-HVI or the DH-98-HVP detectors may be placed into alarm by placing the magnet (HA Part #0700-01117) as shown in
Figure 6.
The SLR photoelectric detector has a built-in sensitivity window verification feature. If the detector is within its
calibrated sensitivity range the detector LEDs will flash Green in standby or normal operation. If the detector drifts
outside its sensitivity range the LEDs will flash Red to indicate an out of sensitivity condition.
With the duct housing cover removed, place the magnet (HA Part #0700-01117) on the detector as shown in
Figure 4 for approximately six (6) seconds. The detector should not alarm. Place the magnet on the opposite
side (Figure 5) for another six (6) seconds. The detector LEDs should illuminate and the duct housing should
go into alarm. This test will verify that the detector is within its intended limits.
1. With power source de-energized and the smoke detector not installed,
wire all connections per engineering drawings. Refer to the applicable
figures below depending on your duct housing model number.
2. With all wiring in place, install the detector head.
3. Energize the duct detector.
Wiring must conform to applicable local codes, ordinances and regulations covering these types of devices.
Wire the detectors according to the engineering drawings for the particular job requirements. These detectors
are not intended for open area protection, nor should they be used for open air protection. Refer to NFPA 90A
and NFPA 72 for general and additional information on Duct Smoke Detectors concerning operation and
installation. Terminals are suitable for up to #14 gauge wire.
To verify proper sampling of air, use a Dwyer Model 4000 differential pressure gauge (or
equivalent). See Figure 3 for gauge connections. The pressure differential between input
sampling tube and exhaust tube should be greater than 0.01" of water and less than 1.2" of water.
Move duct housing/sampling tube assembly to desired location. Use 4 mounting
screws (4 #12 x 1/2" sheet metal screws, packaged in installation kit) to secure the
housing to the air duct.
1. Sampling tube connectors are equipped with set screws, which allow the tubes to be
mounted only in directions shown in Figure 2. Establish proper orientation
considering airflow direction.
2. Insert intake and exhaust tubes into connectors, align set screw to set screw hole in
tubes and tighten firmly.
1. Cut the intake sampling tube to the desired length.
2. Firmly insert the stopper (packaged in installation kit) in the end of the INTAKE sampling tube.
INTAKE SAMPLING TUBES STANDARD LENGTHS:
Models DH-98-P and DH-98-HVP:
Models DH-98-I and DH-98-HVI:
III. ELECTRICAL INSTALLATION
FIG. 6 MAGNET PLACEMENT
POWER BEFORE SERVICING
VOLTAGE TERMINALS - DISCONNECT
REMOVAL OF COVER EXPOSES HIGH
ameri ca cor porati on
Smoke Detector
DH-98 Duct
FIG. 4 L.E.D.S
PILOTALARM RESET
TEST
DH-98-P
DH-98-I
DH-98-A
DH-98-AR
FIG. 5
FIG. 3 AIR SAMPLING
VERIFICATION
For duct widths of 1.0' to 2.5'
For duct widths of 2.5' to 5.0'
For duct widths of 5.0' to 10.0'
EXHAUST TUBE
HOLE &
CONNECTOR
LOW PRESSURE
SIDE
STS-2.5
STS-5.0
STS-10.0
DWYER #4000 DIFFERENTIAL
PRESSURE GAUGE (OR
EQUIVALENT) WITH TUBING
AND SIZE 0 RUBBER STOPPERS
(HA PART# 0700-01118).
HIGH PRESSURE
SIDE
INTAKE TUBE
HOLE &
CONNECTOR
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700-09887, Page 1 of 3) Specifications subject to change without notice. * August 2014
B. VERIFY AIR FLOW AND DIRECTION
C. SAMPLING TUBE ASSEMBLY (See Figure 2)
D. MOUNT SAMPLING TUBES (See Figure 2)
E. MOUNT THE DUCT HOUSING (See Figure 1B & 2)
F. VERIFY AIR SAMPLING (See Figure 3)
A. GENERAL INFORMATION
B. DETECTOR WIRING
C. TESTING THE INSTALLATION
I. LOCATION REQUIREMENTS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Note: All duct detector models can be tested with actual smoke. Remove the duct detector cover. Test the detector head by
lighting a piece of cotton clothesline. and placing it approximately 3 inches from the detector head. Blow across the lit end of the
clothesline toward the detector. The LEDs on the detector should illuminate within one minute. After performing this test
sequence, reinstall the duct detector cover.
D. WIRING DIAGRAMS - DH-98-I, DH-98-P, DH-98-HVI and DH-98-HVP
These duct sensors are analog addressable and can be calibrated by a U.L. Listed analog control panel.
See the FACP Installation Instructions for specific directions.
G N H
115 VAC 60 Hz INPUT
@ 0.1 AMP MAX.
115 V.A.C. OPERATION
1 2 3 4 5 6
DH-98-I
DH-98-P
24 V.A.C. OPERATION
DH-98-I
DH-98-P
1 2 3 4 5 6
See
Power
Connections
DH-98 DUCT SMOKE DETECTOR
Models DH-98-A/DH-99-A and DH-98-AR/DH-99-AR
24 VAC, 60 Hz
@ 0.1 AMP MAX.(Detector only).
UP TO 1.9 AMPS FOR AUXILIARY
OUTPUTS (HORNS/STROBES).
ALARM
CONTACTS
10.0A @ 115VAC
1 2 3 4 5 6
1 2 3 4 5 6
DH-98-HVI
DH-98-HVP
230 V.A.C. OPERATION
230 VAC 60 Hz INPUT
@ 0.1 AMP MAX.
G N H
DH-98-I
DH-98-P
24 V.D.C. OPERATION
- +
24 VDC
@ 0.1 AMP MAX.(Detector only).
UP TO 1.9 AMPS FOR AUXILIARY
OUTPUTS (HORNS/STROBES).
*Trouble contacts are shown in non-energized
condition. Trouble contacts monitor power
connected and head removed.
REMOTE
ACCESSORIES
*TROUBLE
CONTACTS
10.0A @ 115VAC
ALARM
CONTACTS
1A @ 24VDC
CAUTION: Since the analog loop is current limited similar to a conventional two-wire loop, the DH-98-AR/DH-99-AR
cannot be guaranteed to operate under all conditions. This analog duct housing must be treated as a two-wire conventional
duct detector when considering auxiliary functions necessary for smoke control. When smoke control is absolutely necessary,
the conventional four-wire duct detector (DH-98-P, DH-98-I, DH-98-HVP, DH-98-HVI) used with a contact monitoring
module will satisfy the condition.
Terminate Remote Accessories as indicated above (if required).
This is not a self-contained stand alone detector.
A U.L. Listed Analog Addressable Fire System is required.
ANALOG ADDRESSABLE
FIELD LOOP WIRING
REMOTE TEST
SWITCH
(Test function only. does not reset.)
REMOTE
ALARM
LED
6
III. ELECTRICAL INSTALLATION, continued
OBSERVE POLARITY
INPUT VOLTAGE
24 V.D.C.
S (+)
SC (-)
UL LISTED
CONTROL PANEL
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700-09887, Page 2 of 3)
A.A.
CONTROL
PANEL
ADDRESSABLE
LOOP
1 2
+-
REMOTE
PILOT LED
10 mA Standby
55mA Alarm
3 4
+ -
+
5
DH-98-AR /DH-99-AR WIRING DIAGRAM
DH-98-A/DH-99-A WIRING DIAGRAM
The DH-98-A/DH-99-A and DH-98-AR/DH-99-AR
are not self-contained sensors.
This product is compatible only with fire alarm
control panels that utilize Hochiki's Digital
Communications Protocol, DCP.
For example the FireNET Control Panel.
D. WIRING DIAGRAMS, continued
UL LISTED
CONTROL PANEL
LOOP INTERFACE S (+)
SC (-)
SUPPLY VOLTAGE
TO NEXT SENSOR
OR RETURN
TO CONTROL PANEL
ALARM CONTACTS
10.0A @ 250VAC
NC
ALARM CONTACTS
10.0A @ 250VAC
NONC C
7 8 9 10
NO
C
1211
STANDBY 390 mA
ALARM 8mA
-R +RL2L1
FAN SHUTDOWN EXAMPLE
421 3
FAN
TO NEXT
SENSOR
ALG-DH/ALK-D ANALOG
SENSOR
Specifications subject to change without notice. * August 2014
Note: All duct detector models can be tested with actual smoke. Remove the duct detector cover. Test the detector head by
lighting a piece of cotton clothesline. and placing it approximately 3 inches from the detector head. Blow across the lit end of the
clothesline toward the detector. The LEDs on the detector should illuminate within one minute. After performing this test
sequence, reinstall the duct detector cover.
D. WIRING DIAGRAMS - DH-98-I, DH-98-P, DH-98-HVI and DH-98-HVP
These duct sensors are analog addressable and can be calibrated by a U.L. Listed analog control panel.
See the FACP Installation Instructions for specific directions.
G N H
115 VAC 60 Hz INPUT
@ 0.1 AMP MAX.
115 V.A.C. OPERATION
1 2 3 4 5 6
DH-98-I
DH-98-P
24 V.A.C. OPERATION
DH-98-I
DH-98-P
1 2 3 4 5 6
See
Power
Connections
DH-98 DUCT SMOKE DETECTOR
Models DH-98-A/DH-99-A and DH-98-AR/DH-99-AR
24 VAC, 60 Hz
@ 0.1 AMP MAX.(Detector only).
UP TO 1.9 AMPS FOR AUXILIARY
OUTPUTS (HORNS/STROBES).
ALARM
CONTACTS
10.0A @ 115VAC
1 2 3 4 5 6
1 2 3 4 5 6
DH-98-HVI
DH-98-HVP
230 V.A.C. OPERATION
230 VAC 60 Hz INPUT
@ 0.1 AMP MAX.
G N H
DH-98-I
DH-98-P
24 V.D.C. OPERATION
- +
24 VDC
@ 0.1 AMP MAX.(Detector only).
UP TO 1.9 AMPS FOR AUXILIARY
OUTPUTS (HORNS/STROBES).
*Trouble contacts are shown in non-energized
condition. Trouble contacts monitor power
connected and head removed.
REMOTE
ACCESSORIES
*TROUBLE
CONTACTS
10.0A @ 115VAC
ALARM
CONTACTS
1A @ 24VDC
CAUTION: Since the analog loop is current limited similar to a conventional two-wire loop, the DH-98-AR/DH-99-AR
cannot be guaranteed to operate under all conditions. This analog duct housing must be treated as a two-wire conventional
duct detector when considering auxiliary functions necessary for smoke control. When smoke control is absolutely necessary,
the conventional four-wire duct detector (DH-98-P, DH-98-I, DH-98-HVP, DH-98-HVI) used with a contact monitoring
module will satisfy the condition.
Terminate Remote Accessories as indicated above (if required).
This is not a self-contained stand alone detector.
A U.L. Listed Analog Addressable Fire System is required.
ANALOG ADDRESSABLE
FIELD LOOP WIRING
REMOTE TEST
SWITCH
(Test function only. does not reset.)
REMOTE
ALARM
LED
6
III. ELECTRICAL INSTALLATION, continued
OBSERVE POLARITY
INPUT VOLTAGE
24 V.D.C.
S (+)
SC (-)
UL LISTED
CONTROL PANEL
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700-09887, Page 2 of 3)
A.A.
CONTROL
PANEL
ADDRESSABLE
LOOP
1 2
+-
REMOTE
PILOT LED
10 mA Standby
55mA Alarm
3 4
+ -
+
5
DH-98-AR /DH-99-AR WIRING DIAGRAM
DH-98-A/DH-99-A WIRING DIAGRAM
The DH-98-A/DH-99-A and DH-98-AR/DH-99-AR
are not self-contained sensors.
This product is compatible only with fire alarm
control panels that utilize Hochiki's Digital
Communications Protocol, DCP.
For example the FireNET Control Panel.
D. WIRING DIAGRAMS, continued
UL LISTED
CONTROL PANEL
LOOP INTERFACE S (+)
SC (-)
SUPPLY VOLTAGE
TO NEXT SENSOR
OR RETURN
TO CONTROL PANEL
ALARM CONTACTS
10.0A @ 250VAC
NC
ALARM CONTACTS
10.0A @ 250VAC
NONC C
7 8 9 10
NO
C
1211
STANDBY 390 mA
ALARM 8mA
-R +RL2L1
FAN SHUTDOWN EXAMPLE
421 3
FAN
TO NEXT
SENSOR
ALG-DH/ALK-D ANALOG
SENSOR
Specifications subject to change without notice. * August 2014
The DH-98/99 series duct detectors have the ability to interconnect (all alarm relays operate with a single alarm)
using the same independent power supply. Polarity must be observed throughout the connection using
terminals 16 and 18 from each unit. Up to 30 units may be interconnected.
INTERCONNECT WIRING DIAGRAM (MULTIPLE FAN SHUTDOWN)
DH-98-I, DH-98-P, DH-98-HVI and DH-98-HVP
Up to 1.9 Amps @ 24 VDC
(Depends upon Input power to
terminals 4 and 5).
Remote accessory terminals 16 to 20 are not supervised and the output voltage will be present when the duct
detector is in alarm or the test/reset switch is operated.
* Remote common alarm indication, remote pilot indication, remote common reset, common shutdown and common
visual indication.
* Common fault indication (when green pilot LED is extinguished) cannot be achieved on the DH-98 Duct Units.
Individual Remote Pilot LED's must be installed to monitor detector head or power source removal for each unit.
* In the event of an alarm, the detector head and duct unit alarm (Red) LED's will be illuminated. All remaining duct unit
alarm LED's will not be illuminated. All remote alarm LED's fitted to the duct units will be illuminated when any of the
units go into alarm. Only the duct unit in alarm will permit resetting of the system from the built in test/reset switch on
that particular duct unit.
* A common Remote reset switch will reset all detectors.
Installation requiring common functions must be wired as shown in Figure 5B.
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700- 09887, Page 3 of 3)
Input Power Source
Will Be Either
24V, 115V or 230V
18
19
19
18
16
18
DUCT UNIT #1
Strobe
&
Horn
INPUT
POWER
BLACK
RED
RED
BLACK
Positive
Negative
Positive
Negative
RED
"ALARM"
LED
P
P
15mA @
24 VDC
REMOTE ACCESSORY WIRING
Common functions include one or all of the following:
FIRE ALARM CONTROL PANEL WIRING
COMMON FUNCTION
Input Power Source
Will Be Either
24V, 115V or 230V 19
20
18
17
FIG. 5A
UL
LISTED
FIRE
ALARM
CONTROL
UNIT
+
-
DUCT UNIT #1
DH-98 DETECTOR
#1
INPUT
POWER
P
P
11
Specifications subject to change without notice. * August 2014
4A @
24 VDC
15mA @
24 VDC
16
18
FIG. 7
16
18
Negative
Positive
RED
BLACK
DUCT UNIT #2
16
20
16
17
DUCT UNIT #3
Key or
Push Button
"Test/Reset"
Switch
GREEN
"PILOT"
LED
DUCT UNIT #3
EOLR
END
OF
LINE
RESISTOR
FIG. 5B
19
20
17
18
DUCT UNIT #2
INPUT
POWER
12
P
P
14
11
15
DH-98 DETECTOR
#2
1514
INPUT
POWER
12
19
20
17
18
P
P
See Note A
NOTE A: Do not use with 115 VAC or 230 VAC operation.
HOCHIKI AMERICA CORPORATION
7051 Village Drive Suite 100 * Buena Park, CA 90621-2268
Phone: 714/522-2246 * Fax: 714/522-2268
Technical Support: 800/845-6692 or [email protected]
using the same independent power supply. Polarity must be observed throughout the connection using
terminals 16 and 18 from each unit. Up to 30 units may be interconnected.
INTERCONNECT WIRING DIAGRAM (MULTIPLE FAN SHUTDOWN)
DH-98-I, DH-98-P, DH-98-HVI and DH-98-HVP
Up to 1.9 Amps @ 24 VDC
(Depends upon Input power to
terminals 4 and 5).
Remote accessory terminals 16 to 20 are not supervised and the output voltage will be present when the duct
detector is in alarm or the test/reset switch is operated.
* Remote common alarm indication, remote pilot indication, remote common reset, common shutdown and common
visual indication.
* Common fault indication (when green pilot LED is extinguished) cannot be achieved on the DH-98 Duct Units.
Individual Remote Pilot LED's must be installed to monitor detector head or power source removal for each unit.
* In the event of an alarm, the detector head and duct unit alarm (Red) LED's will be illuminated. All remaining duct unit
alarm LED's will not be illuminated. All remote alarm LED's fitted to the duct units will be illuminated when any of the
units go into alarm. Only the duct unit in alarm will permit resetting of the system from the built in test/reset switch on
that particular duct unit.
* A common Remote reset switch will reset all detectors.
Installation requiring common functions must be wired as shown in Figure 5B.
Hochiki America Corporation
* DH-98/99 Installation Instructions (HA-06-073. P/N 1700- 09887, Page 3 of 3)
Input Power Source
Will Be Either
24V, 115V or 230V
18
19
19
18
16
18
DUCT UNIT #1
Strobe
&
Horn
INPUT
POWER
BLACK
RED
RED
BLACK
Positive
Negative
Positive
Negative
RED
"ALARM"
LED
P
P
15mA @
24 VDC
REMOTE ACCESSORY WIRING
Common functions include one or all of the following:
FIRE ALARM CONTROL PANEL WIRING
COMMON FUNCTION
Input Power Source
Will Be Either
24V, 115V or 230V 19
20
18
17
FIG. 5A
UL
LISTED
FIRE
ALARM
CONTROL
UNIT
+
-
DUCT UNIT #1
DH-98 DETECTOR
#1
INPUT
POWER
P
P
11
Specifications subject to change without notice. * August 2014
4A @
24 VDC
15mA @
24 VDC
16
18
FIG. 7
16
18
Negative
Positive
RED
BLACK
DUCT UNIT #2
16
20
16
17
DUCT UNIT #3
Key or
Push Button
"Test/Reset"
Switch
GREEN
"PILOT"
LED
DUCT UNIT #3
EOLR
END
OF
LINE
RESISTOR
FIG. 5B
19
20
17
18
DUCT UNIT #2
INPUT
POWER
12
P
P
14
11
15
DH-98 DETECTOR
#2
1514
INPUT
POWER
12
19
20
17
18
P
P
See Note A
NOTE A: Do not use with 115 VAC or 230 VAC operation.
HOCHIKI AMERICA CORPORATION
7051 Village Drive Suite 100 * Buena Park, CA 90621-2268
Phone: 714/522-2246 * Fax: 714/522-2268
Technical Support: 800/845-6692 or [email protected]
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