System Sensor DH200PL - Manual (Page 3)

D200-38-00 3 I56-1976-004R
SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.
Figure 3. Installation of foam gaskets over sampling
tube bushings:
Figure 5. Tube mounting configurations with varying
air flow direction:
[4.1] Installation For Ducts Greater Than 1 1 ⁄
2
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 3 ⁄
4
″ (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.
2. Slide the tube into the housing bushing that meets the
air flow first. Position the tube so that the arrow points
into the air flow, as shown in Figure 4.
3. Secure the tube flange to the housing bushing with two
#6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube
should extend out of the opposite side of the duct. If there
are more than 2 holes in the section of the tube extend-
ing out of the duct, select a different length using Table
1. Otherwise, trim the end of the tube protruding through
the duct so that 1″ to 2″ (25 to 50mm) of the tube extend
outside the duct. Plug this end with the end cap and tape
closed any holes in the protruding section of the tube. Be
sure to seal the duct where the tube protrudes.
NOTE: The sampling tube end cap is critical to the proper
operation of the duct smoke detectors. The end cap is
needed to create the proper air flow to the sensor of the
duct smoke detector.
Table 1. Sampling tubes recommended for different
duct widths:
Outside Duct Width Sampling Tube Recommended*
1 to 2 ft. (0.3 to 0.6 m)
ST-1.5
2 to 4 ft. (0.6 to 1.2 m) ST-3
4 to 8 ft. (1.2 to 2.4 m) ST-5
8 to 12 ft. (2.4 to 3.7 m) ST-10
*Must extend a minimum of 2⁄3 the duct width
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
Figure 4. Air duct detector sampling tube:
H0108-02
AIR FLOW
DIRECTION
DETECTOR
HOUSING
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DETECTOR
HOUSING
SAMPLING
TUBE
EXHAUST
TUBE
AIR FLOW
DIRECTION
EXHAUST
TUBE
SAMPLING
TUBE
SAMPLING
TUBE
EXHAUST
TUBE
DETECTOR
HOUSING
AIR FLOW
DIRECTION
DETECTOR
HOUSING
A. B.
C. D.
HORIZONTAL MOUNTING OF HOUSING
VERTICAL MOUNTING OF HOUSING
NOTE: Only metal sampling tubes can be installed in
orientations C and D.
[4.2] Installation For Ducts More Than 8 Feet (2.4m) Wide
NOTE: To install sampling tubes in ducts more than 8 feet
(2.4m) wide, work must be performed inside the
air duct. Sampling of air in ducts wider than 8 feet
(2.4m) is accomplished by using the ST-10 sam-
pling tube. 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 and support the end
opposite the duct smoke detector.
Install the sampling tube as follows:
1. Drill a
3 ⁄
4
-inch (19mm) hole in the duct directly opposite
the hole already drilled 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 for moisture drainage.
2. Slide the sampling tube with the flange into the housing
bushing that meets the air flow first. Position the tube so
that the arrow points into the air flow. Secure the tube
flange to the housing bushing with two #6 self-tapping
screws.
H0109-01
H0107-00