System Sensor INNOVAIR DH100ACDCLWP - Manual (Page 3)

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 3). Figure 4 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 3.
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.
[5.5.1] 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
″ hole in the duct opposite the hole already cut for the
sampling tube. Make sure the hole is 1″ to 2″ below the
inlet hole on the opposite side of the duct to allow mois-
ture drainage away from the detector. If the tube is short-
er 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 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.
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 where 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 3. Air duct detector sampling tube:
H0108-02
Figure 5. Tube mounting configurations with varying
air flow direction:
H0109-01
NOTE: Only metal sampling tubes may be used on ori-
entations C and D.
[5.5.2] Installation For Ducts More Than 8 Feet Wide
NOTE: To install sampling tubes in ducts more than 8 feet
wide, work must be performed inside the air duct.
Sampling of air in ducts wider than 8 feet is accom-
plished by using the ST-10 sampling 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 inlet tube as follows:
1. Drill a
3 /
4
-inch hole in the duct directly opposite the hole
already drilled for the inlet tube. Make sure the hole is 1
to 2″ 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.
3. From inside the duct, couple the other sections of the
sampling tube to the section already installed using the
1 /
2
-inch conduit fittings supplied. Make sure that the
holes on both of the air inlet tubes are lined up and fac-
ing into the air flow.
4. Trim the end of the tube protruding through the duct so
that 1 to 2″ 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
when the tube protrudes.
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
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
D200-24-00 3 I56-0056-07R