Controller Options; Low Ambient; Smoke Detectors - Carrier WeatherExpert 48JC04 Installation Instructions Manual

Controller Options

LOW AMBIENT

Refer to the 48/58JC 04-06 Single Package Rooftop Units with
SystemVu Controller Controls, Start-up, Operation and Trou-
bleshooting manual for details on adjusting "Cooling Lock-
Out" setting and configure for the specific job requirements.

Smoke Detectors

Smoke detectors are available as factory-installed options on
48JC models. 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
arranged for vertical return configurations only. All compo-
nents necessary for operation are factory-provided and mount-
ed. The unit is factory-configured for immediate smoke detec-
tor shutdown operation; additional wiring or modifications
may be necessary to complete the unit and smoke detector con-
figuration to meet project requirements.
Units equipped with factory-installed optional return-air smoke
detectors require a relocation of the sensor module at unit in-
stallation. See Fig. 51 for the as-shipped location.
Completing Return Air Smoke Sensor Installation
1. Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 52, 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. 52, Step 2.
3. Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. See Fig. 52, Step 3.
4. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
STEP 1
Fig. 52 — Completing Installation of Return Air Smoke Sensor
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 51 — Return Air Smoke Detector,
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 2
29
Shipping Position
STEP 3