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Supply Air
Smoke Detector
Fig. 44 — Typical Supply Air Smoke Detector Sensor
Location
RETURN AIR SMOKE DETECTOR SENSOR WITHOUT
ECONOMIZER
The sampling tube is located across the return air opening on the
unit basepan. See Fig. 45. The holes in the sampling tube face
downward, into the return air stream. The sampling tube is con-
nected through tubing to the return air sensor that is mounted on a
bracket high on the partition between return filter and controller
location. The sensor is shipped in a flat-mounting location. Instal-
lation requires that this sensor be relocated to its operating location
and the tubing to the sampling tube be connected. See installation
steps.
Return Air
Smoke Detector
(As Shipped)
Fig. 45 — Typical Return Air Smoke Detector
Location
RETURN AIR SMOKE DETECTOR SENSOR WITH
ECONOMIZER
The sampling tube is inserted through the side plates of the econo-
mizer housing, placing it across the return air opening on the unit
basepan. See Fig. 46. The holes in the sampling tube face down-
ward, into the return air stream. The sampling tube is connected
using tubing to the return air sensor mounted on a bracket high on
the partition between return filter and controller location. The sen-
sor is shipped in a flat-mounting location. Installation requires the
sensor be relocated to its operating location and the tubing to the
sampling tube be connected. See installation steps below.
Fig. 46 — Return Air Sampling Tube Location
(View reoriented to show opposite side for clarity.)
Completing Installation of Return Air Smoke
Detector
Use the following steps to complete the installation of the return
air smoke detector.
1.
Unscrew the 2 screws holding the return air sensor detec-
tor plate. See Fig. 47. Save the screws.
Fig. 47 — Return Air Smoke Detector
Shipping Position
2.
Remove the return air smoke sensor module and its
detector plate.
27
Return Air
Sampling Tube
Flexible Exhaust Tubes
Screws
Sample Tube
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