System Sensor DH200PL User Manual
Page 2
D200-38-00
2
I56-1976-004R
[2.1] Sampling Tube Installation for Ducts Less Than
1
1
⁄
2
Feet (0.46m) Wide (see Figure 2)
1. Remove the front cover.
2. Slide the plastic sampling tube into the housing bushing.
3. Align the holes in the bushing with the holes in the sam-
pling tube. Make sure there are 6 exposed holes on the
plastic sampling tube. Secure with the #8 self-tapping
screw into the bottom of the permanent tube (shown in
Fig. 2).
NOTE: For ducts greater than 1
1
⁄
2
feet (0.46m) in width,
refer to sections [4], [4.1] and [4.2].
[3] Secure The Detector Housing To The Duct
Slide the foam gaskets over the tube bushings as shown
in Figure 3. Use the two 1
1
⁄
4
″ long sheet metal screws to
screw the detector housing to the duct.
CAUTION: Do not overtighten the screws.
[4] Sampling Tube Installation for Ducts Greater
Than 1
1
⁄
2
Feet (0.46m) Wide
The sampling tube is identified by a series of air inlet holes
on the tube. A plastic tube is included for ducts up to 1
1
⁄
2
feet (0.46m) wide. All other lengths must be purchased
separately. Order the correct length, as specified in Table
1, for width of the duct where it will be installed. It is rec-
ommended that the sampling tube length extend at least
2
⁄3
across the duct width for optimal performance. The
exhaust tube is molded onto 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 (50mm) into the duct.
The sampling tube is always installed with the air inlet
holes facing into the air flow. To assist proper installation,
the tube’s mounting flange is marked with an arrow. Make
sure the sampling tube is mounted so that the arrow points
into the air flow (see Figure 4). Figure 5 shows the various
combinations of tube mounting configurations with respect
to air flow. Mounting the detector housing in a vertical ori-
entation is acceptable, provided that a metal sampling tube
is installed and the air flows directly into the sampling tube
holes as indicated in Figure 4.
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.
It is strongly recommended that the user read NFPA
Standards 90A, 72, and 101.
WARNING
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.
WARNING
This device will not sense smoke unless the ventilation
system is operating.
WARNING
In order to function properly, this detector must be installed
according to the instructions. Do not exceed the electrical or
ambient specifications or the detector will not function prop-
erly. This detector must be protected from the elements.
Installation Sequence
Step 1. Verify duct air flow direction and velocity ......... 2
Step 2. Drill the mounting holes .................................. 2
Step 2.1 Install the sampling tube for ducts
less than 1
1
⁄
2
feet (0.46m) wide ........................ 2
Step 3. Secure the detector housing to the duct ............ 2
Step 4. Install the sampling tube for ducts
greater than 1
1
⁄
2
feet (0.46m) wide .................. 2
Step 4.1 Installation for ducts greater than 1
1
⁄
2
feet (0.46m)
but less than 8 feet (2.4m) wide .................... 3
Step 4.2 Installation for ducts more than 8
feet
(2.4m) wide .................................................... 4
Step 5. Install the filters .............................................. 4
Step 6. Field wiring ..................................................... 4
Step 7. Perform detector check .................................... 5
Step 8. Install the cover............................................... 5
Step 9. Detector Maintenance and Test Procedures ....... 5
[1] Verify Duct Air Flow Direction And Velocity
The DH200PL duct smoke detector is designed to be used
in air handling systems having air velocities of 100 to
4000 feet per minute (0.5 to 20.32m/s). 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. See Air
Flow Test, section 9.1.
[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.
Figure 2. Plastic sampling tube
connected to duct smoke detector:
WARNING
H0110-00