23
Fig. 42 — 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. 43. The holes in the sampling tube
face downward, into the return air stream. The sampling tube is
connected through tubing to the return air sensor that is mount-
ed on a bracket high on the partition between return filter and
controller location. The sensor is shipped in a flat-mounting lo-
cation. Installation requires that this sensor be relocated to its
operating location and the tubing to the sampling tube be
connected. See installation steps.
Fig. 43 — Typical Return Air Smoke Detector
Location
RETURN AIR SMOKE DETECTOR SENSOR WITH
ECONOMIZER
The sampling tube is inserted through the side plates of the
economizer housing, placing it across the return air opening on
the unit basepan. See Fig. 44. The holes in the sampling tube
face downward, 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 control-
ler location. The sensor 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
detector plate.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
RETURN AIR
SAMPLING TUBE
SAMPLE TUBE
SCREWS
FLEXIBLE EXHAUST TUBES
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