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Smoke Detectors
Smoke detectors are available as factory-installed options on
48LC 08-12 units. Smoke detectors may be specified for supply
air only, for return air without or with economizer, or in combina-
tion of supply air and return air. Return air smoke detectors are ar-
ranged for vertical return configurations only. 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 the Integrated
Staging Control (ISC) board may be necessary to complete the
unit and smoke detector configuration to meet project require-
ments.
Units equipped with factory-optional return air smoke detectors
require a relocation of the sensor module at unit installation. See
Fig. 74 for the as-shipped location.
COMPLETING
INSTALLATION
SMOKE SENSOR
1. Unscrew the two screws holding the return air smoke
detector assembly. See Fig. 75, 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. 75, Step 2.
3. Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. See Fig. 75, Step 3.
4. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
ADDITIONAL APPLICATION DATA
Refer to 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 coordi-
nation.
Step 1
All manuals and user guides at all-guides.com
OF
RETURN-AIR
Fig. 75 — Completing Installation of Return-Air Smoke Sensor
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 74 — Return-Air Smoke Detector
Step 2
59
(Shipping Position)
Step 3
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