Notifier DHX-501 Installation And Maintenance Instructions Manual - page 2
Maximum alarm output current is 20 mA (terminals 2 and 6).
Relay Contacts
Minimum contact current must be greater than 500 mA
10A @ 30 VDC
10A @ 250 VAC
Accessories
Part No.
Remote LED
RA400Z
Piezo Alert Sounder
PA400
Replacement Filters
F36-05-00
Magnet
M02-04-00
End Plug For Sampling Tube
P48-21-00
Installation Kit (Parts bag)
A2650-01
Photoelectronic Replacement Screen
RS24
Ionization Replacement Screen
RS14
Sensitivity Test Kit
MOD400 or MOD400R
Ionization Cover Removal Tool
CRT400
Remote Test Station
RTS451/RTS451KEY
Calibrated Test Card (For photo units only) R59-18-00
SAMPLING (INLET) TUBES
TUBE
OUTSIDE DUCT WIDTH
ST-1.5
1 to 2 ft.
(0.3 to 0.6 m)
ST-3
2 to 4 ft.
(0.6 to 1.2 m)
ST-5
4 to 8 ft.
(1.2 to 2.4 m)
ST-10
8 to 12 ft.
(2.4 to 3.7 m)
Programming Specifications/Requirements For Intelligent System Control Panels.
CAUTION:
Models CPX-551 and SDX-551 can be used with the DHX-501 if the following constraints are observed.
1. There may be a limit to the number of devices per zone that can have their LEDs latched on. The actual number
of devices is determined by the control panel and its ability to supply LED current. As seen with Rev. 4 or earlier
AM-2020 Systems, the control panel stops latching device LEDs on after 4 devices indicate an alarm. The
maximum number of devices that can be latched in an alarm state at one time is 4. If more than the maximum
number of devices are on the same loop, Do NOT use the DHX-501 for control purposes. Control for duct
applications would need to come directly from the control panel or by using control modules.
The following applies to the AM 2020 and AFP-1010 Systems that use Revision 5 or higher software, and “R4” type
intelligent detectors and modules: the LED restriction does not apply, and all LEDs may be latched on. Consult
the AM-2020/AFP-1010 programming manual for additional information.
When System 5000 control panels are used with AIM-200 modules, they may ignore the LED restriction by
selecting the “FL” full LED control. Consult the AIM-200 manual for further information.
2. The duct control circuitry (auxiliary relay contacts and 12 volt alarm output) may operate (change states) if the
sensor is tested and the LED is turned on for more than 4 seconds. If the LED is latched on for less than 4 seconds,
the control circuitry of the DHX-501 will NOT operate.
3. The panel must not continuously poll the same unit for more than 4 seconds or the auxiliary relay and 12 volt alarm
output may switch states. After 4 seconds of continual polling of a device, the panel must wait a minimum of 100ms
before polling or communicating to that same device.
4. Communications must not cease for more than 3 seconds without an additional clock pulse (after Pulse Width 5)
to turn off the LED on the sensor.
5. To allow the auxiliary relay and 12 volt alarm output to return to standby (after being in alarm), the panel must wait
a minimum of 100ms after turning off the sensor LED before communicating with that device again.
6. The following systems must use the CPX-551 with the DHX-501 models when high sensitivity is selected: 1)
System 5000 panels with AIM-200 modules, and 2) AM 2020 Systems with Revision 4, or earlier, software.
1. Complete housing base and cover assembly.
2. Two #10 sheet metal mounting screws.
3. Two sampling tube filters.
4. One test magnet.
5. Drilling template.
6. Two 5/16-inch O-rings.
7. Two foam gaskets.
8. Four #6 self-tapping mounting screws for the sampling tube.
9. One filter adapter.
10.One inlet tube end plug.
11.Two #10 speed nuts.
Note 1:The inlet sampling tube must be ordered separately. It must be the correct length for the width of the duct
where it will be installed. See Table 1 on Page 3 to determine the inlet tube required for different duct widths.
A smoke detector head (CPX-551 for ionization or an SDX-551 for photoelectronic) must be ordered
separately.
WARNING
LIMITATIONS OF DUCT DETECTORS
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.
Notifier supports this position and strongly recommends that the user read NFPA Standards 90A, 72, and 101. The
DHX-501 is listed per UL 268A.
WARNING: This device cannot operate without electrical power. Frequently, fire situations may cause an
interruption of power to the detector. The system safeguards should be discussed with your local fire
protection specialist.
WARNING: This device will 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.
INSTALLATION SEQUENCE
PAGE
Step 1. Verify duct air flow direction and velocity .......................................................................................................... 2
Step 2. Drill the mounting holes ...................................................................................................................................... 2
Step 3. Mount duct housing ............................................................................................................................................ 3
Step 4. Install the inlet tube ............................................................................................................................................ 3
Step 5. Complete the field wiring .................................................................................................................................... 5
Step 6. Install the filters ................................................................................................................................................... 7
Step 7. Perform detector check ...................................................................................................................................... 7
Step 8. Install the cover ................................................................................................................................................... 9
Step 9. Perform the final system check (Testing) .......................................................................................................... 9
STEP 1. VERIFY DUCT AIR FLOW DIRECTION AND VELOCITY
The DHX-501 is 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.
STEP 2. DRILL THE MOUNTING HOLES
Remove the paper backing from the drilling template. Affix the template to the air duct at the desired mounting location.
Make sure the template lies flat and smooth on the air duct. Center punch hole targets and remove the template. Drill
the holes as indicated on the template. Slide the two speed nuts over the two small holes (Hole A) next to the sampling
tube bushing holes (Hole B) previously drilled in the duct. (See Figure 2.)
N500-03-00
2
I56-456-07
N500-03-00
11
I56-456-07