System Sensor INNOVAIR DH100LP - Manual (Page 3)

the inlet hole on the opposite side of the duct to allow for
moisture drainage. 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. long must
be supported at the end opposite the duct 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.
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
extending 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″ of the tube extend out-
side 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 when the tube protrudes.
NOTE: The sampling tube end cap is critical to the proper
operation of the duct smoke detector. The end cap
is needed to create the proper air flow to the sensor
of the duct smoke detector.
Figure 4. Air duct detector inlet sampling tube:
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
H0108-02
Figure 5. Tube mounting configurations with varying
air flow direction:
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
[5.3] 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.
Figure 3. Installation of foam gaskets over sampling
tube bushings:
SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.
H0107-00
[5.4] Sampling Tube Installation of Ducts Greater
Than 1
1 ⁄
2
Feet Wide
The sampling tube is identified by a series of air inlet holes
on the tube. One plastic tube is included for ducts up to 18″
in width. 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 recommended
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 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 the air flows directly
into the sampling tube holes as indicated in Figure 4.
Table 1. Sampling tubes recommended for different
duct widths:
Outside Duct Width Sampling Tube Recommended*
1 to 2 ft. ST-1.5
2 to 4 ft. ST-3
4 to 8 ft. ST-5
8 to 12 ft. ST-10
*Must extend a minimum of 2 ⁄
3
the duct width
[5.4.1] Installation For Ducts Greater Than 1 1 ⁄
2
Feet
But Less Than 8 Feet Wide
1. If the tube is longer than the width of the air duct, drill a
3 ⁄
4
-inch hole in the duct opposite the hole already cut for
the sampling tube. Make sure the hole is 1″ to 2″ below
D200-15-00 3 I56-0083-07R
H0109-01
NOTE: Only metal sampling tubes may be used on ori-
entations C and D.