27
Fig. 31 — Typical Supply-Air Smoke Detector Sensor
Location
RETURN AIR WITHOUT ECONOMIZER
The sampling tube is located across the return air opening on the
unit basepan. See Fig. 32. The holes in the sampling tube face
downward, into the return air stream. The sampling tube is at-
tached to the control module bushing that extends from the control
box through the partition into the return air section of the unit. The
sensing tube is shipped mounted to the indoor blower housing and
must be relocated to the return air section of the unit. Installation
requires that this sensing tube be attached to the control module
bushing. See installation steps.
Fig. 32 — Typical Return-Air Smoke Detector Location
(without Economizer)
RETURN AIR 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. 33. The holes in the sampling tube face down-
ward, into the return air stream. The sampling tube is connected
through tubing to the return air sensor that is mounted on a bracket
high on the partition between return filter and controller location.
The return-air 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.
SUPPLY-AIR
SMOKE
DETECTOR
SENSOR
SUPPLY-AIR
SMOKE
DETECTOR
SENSOR
RETURN-AIR
SMOKE
DETECTOR
SENSOR
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