31
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. The holes in the sampling tube face into the return air
stream. See Fig. 39 and 40 for sensor assembly locations, sam-
pling tube location and orientation, and airflow direction example.
The sampling tube is connected using tubing to the return air sen-
sor mounted on a bracket low on the partition, near the return air
filter and opposite the controller location.
Fig. 39 — Vertical Return Air Sampling Sensor
Assembly and Tube Location
(View reoriented to show opposite side for clarity.)
Fig. 40 — Horizontal Return Air Sampling Sensor
Assembly and Tube Location
(View reoriented to show opposite side for clarity.)
FIOP Smoke Detector Wiring and Response
ALL UNITS
The FIOP smoke detector is configured to automatically shut
down all unit operations when a smoke condition is detected. See
Fig. 41, Smoke Detector Wiring.
HIGHLIGHT A
Smoke detector NC contact set will open on smoke alarm condi-
tion, de-energizing the ORN conductor.
HIGHLIGHT B
24-v power signal using the ORN lead is removed at the smoke
detector input on UCB; all unit operations cease immediately.
ADDITIONAL APPLICATION DATA
Refer to the application data document “Factory Installed Smoke
Detectors for Small and Medium Rooftop Units 2-25 Tons” for
discussions on additional control features of these smoke detectors
including multiple unit coordination.
SENSOR BRACKET
BRACKET SUPPORT
EXHAUST TUBE
TUBE SUPPORT
BRACKET
PICKUP TUBE
ASSEMBLY (INTAKE)
TUBE SUPPORT
BRACKET
PICKUP TUBE
ASSEMBLY (INTAKE)
SENSOR
BRACKET
BRACKET SUPPORT
EXHAUST TUBE
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