32
Fig. 43 — Typical Return Air Smoke Detector
Location (size 16 units)
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. 44. 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. 44 — 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 two screws holding the return air sensor
detector plate. See Fig. 45. Save the screws.
Fig. 45 — Return Air Smoke Detector
Shipping Position
2. Remove the return air smoke sensor module and its detec-
tor plate.
3. Rotate the detector plate so the sensor is facing outwards and
the sampling tube connection is on the bottom. See Fig. 46.
Fig. 46 — Return Air Smoke Detector
Operating Position
4. Screw the sensor and detector plate into its operating position
using screws from Step 1. Ensure the sampling tube connec-
tion is on the bottom and the exhaust tube is on the top.
5. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
6. For units with an economizer, the sampling tube is inte-
grated into the economizer housing but connecting the
flexible tubing to the sampling tube is the same.
Return Air
Smoke Detector
(As Shipped)
Sample Tube
Screws
Flexible Exhaust Tubes
Return Air Smoke Detector
(Operating Position Shown)
Screws (2)
Sample Tube
Controller
Module
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