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RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 47 — Return Air Smoke Detector,
Shipping Position
COMPLETING RETURN AIR SMOKE SENSOR
INSTALLATION
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 48, Step 1. Save
the screws.
2. Turn the assembly 90 degrees and then rotate end to
end. Make sure that the elbow fitting is pointing
down. See Fig. 48, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 48,
Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
ADDITIONAL APPLICATION DATA
Refer to the application data document "Factory Installed
Smoke Detectors for Small and Medium Rooftop Units 2 to
25 Tons" for discussions on additional control features of
these smoke detectors including multiple unit coordination.
STEP 1
527 01 2701 00
Fig. 48 — Completing Installation of Return Air Smoke Sensor
Specifications subject to change without notice.
Step 12 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Unit Control
Board (UCB), at terminals marked "Smoke Shutdown." De-
tach the jumper covering the Smoke Shutdown terminals on
the UCB and then attach the wiring harness from the smoke
detector.
ECONOMI$ER IV OCCUPANCY SWITCH
See Fig. 49 on page 38 for general EconoMi$er
External occupancy control is managed through a connec-
tion on the Unit Control Board.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY. Detach the jumper covering the "Occupan-
cy" terminals on the UCB and then attach the required
connections.
Step 13 — Install Accessories
Available accessories include:
•
Roof curb
•
Thru-base connection kit (must be installed before
unit is set on curb)
•
Manual outside air damper
•
Two-Position motorized outside air damper
•
EconoMi$er IV (with control and integrated baromet-
ric relief)
•
Power exhaust
•
Differential dry-bulb sensor (EconoMi$er IV)
•
Outdoor enthalpy sensor
•
Differential enthalpy sensor
•
Electric heaters
•
Single point kits
•
Low Ambient Controls
•
Thermostat / Sensors
•
CO
sensor
2
•
Louvered hail guard
•
Phase monitor control
Refer to separate installation instructions for information on
installing these accessories.
STEP 2
IV wiring.
®
STEP 3
37
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