[2] Figure 1: Exploded View Of Duct Detector Components
SAMPLING TUBE
FILTERS
CONDUIT HOLES
DUCT DETECTOR
HOUSING
TERMINAL STRIP
DUCT DETECTOR
COVER
SAMPLING TUBE
MOUNTING
SCREWS
DETECTOR HEAD
(SUPPLIED SEPARATELY)
EXHAUST
FILTER ADAPTER
DETECTOR BASE
INLET SAMPLING TUBE
(SUPPLIED SEPARATELY)
O-RINGS
FOAM
GASKETS
HOUSING
MOUNTING SCREWS
TEST MAGNET
TUBE
END
PLUG
A78-2093-00
[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-inch O-rings
7. Two rubber tube bushing seals
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:
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 dif-
ferent duct widths.
[4] Limitations Of Duct 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.
System Sensor supports this position and strongly recom-
mends that the user read NFPA Standards 90A, 72, and 101.
The DH400 Air Duct Smoke Detectors are listed per UL
268A.
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 will not sense smoke unless the ventilation sys-
tem is operating.
WARNING
This detector housing is not a weatherproof device, there-
fore it should not be installed above the building roof line
and must be protected from the elements.
[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
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH400 detectors are designed to be used in air han-
dling systems having air velocities of 500 to 4000 feet per
minute. Be sure to check engineering specifications to en-
sure that the air velocity in the duct falls within these pa-
rameters. If necessary, an Alnor Model 6000-P velocity
meter or equivalent, may be used to check the air velocity
in the duct.
D400-14-00
2
I56-554-05
Summary of Contents for DH400
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