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RTU-Open Controller System (Factory-Installed
Option)
For details on operating 50TCQ*07 units equipped with the
factory-installed RTU Open controller, refer to the “Factory-
Installed RTU Open Multi-Protocol Controller Control, Start-
Up, Operation and Troubleshooting” manual.
Smoke Detectors
Smoke detectors are available as factory-installed options on
50TCQ models. Smoke detectors may be specified for supply
air only, for return air without or with economizer, or in combi-
nation of supply air and return air. All components necessary
for operation are factory-provided and mounted. The unit is
factory-configured for immediate smoke detector shutdown
operation; additional wiring or modifications to unit terminal
board may be necessary to complete the unit and smoke detec-
tor configuration to meet project requirements.
Units equipped with factory-optional return air smoke detec-
tors require a relocation of the sensor module at unit installa-
tion. See Fig. 48 for the as-shipped location.
COMPLETING INSTALLATION OF RETURN AIR
SMOKE SENSOR
1. Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 49, 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. 49, Step 2.
3. Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. See Fig. 49, Step 3.
4. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
Fig. 48 — Return Air Smoke Detector
(Shipping Position)
ADDITIONAL APPLICATION DATA
Refer to the Application Data sheet titled, 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.
Fig. 49 — Completing Installation of Return Air Smoke Sensor
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Step 1 Step 2 Step 3
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