System Sensor DH200RPL User Manual

Page 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 sampling 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

⁄

feet (0.46m) in width, refer to sec-

tions [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

⁄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

⁄

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

⁄

feet (0.46m) wide. All other

lengths must be purchased separately. Order the correct length, as speci-
fied in Table 1, for width of the duct where it will be installed. It is recom-
mended that the sampling tube length extend at least

⁄

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 orientation 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 operat-
ing.

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 properly. 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

⁄

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

⁄

feet (0.46m) wide ......................................2

Step 4.1 Installation for ducts greater than 1

⁄

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 DH200RPL duct smoke detector is designed to be used in air han-
dling 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.

[2.1] Sampling Tube Installation for Ducts Less Than 1

⁄

Feet

(0.46m) Wide (see Figure 2)

Figure 2. Plastic sampling tube
connected to duct smoke detector:

D200-39-00 2 I56-1977-004R

WARNING

[4.1] Installation For Ducts Greater Than 1

⁄

Feet (0.46m) But

Less Than 8 Feet (2.4m) Wide
1. If the tube is longer than the width of the air duct, drill a

⁄

″ (19mm)

hole in the duct opposite the hole already cut for the sampling tube.
Make sure the hole is 1″ to 2″ (25 to 50mm) below the inlet hole on
the opposite side of the duct to allow moisture drainage away from the
detector. If the tube is shorter than the width of the air duct, install the
end cap into the sampling tube as shown in Figure 4. Sampling tubes
over 3 ft. (0.91m) long must be supported at the end opposite the duct
smoke detector.