Completing Installation Of Return Air; Smoke Sensor; Additional Application Data - Carrier WeatherExpert 48LC 07 Series Installation Instructions Manual
Single package rooftop unit gas heat/electric cooling with puron (r-410a) refrigerant
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TERMINAL 53
VOLTAGE
Motor
Voltage
Option
208/230V
STD
460V
575V
208/230V
MID
460V
575V
208/230V
HIGH
460V
575V
Smoke Detectors
Smoke detectors are available as factory-installed options on
48LC 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. All components necessary for
operation are factory-provided and mounted. The unit is facto-
ry-configured for immediate smoke detector shutdown opera-
tion; additional wiring or modifications to the Integrated Stag-
ing Control (ISC) board may be necessary to complete the unit
and smoke detector 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. 66 for the as-shipped location.
COMPLETING
INSTALLATION
SMOKE SENSOR
1.
Unscrew the two screws holding the return air smoke
detector assembly. See Fig. 67, 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. 67, Step 2.
3.
Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. See Fig. 67, Step 3.
4.
Connect the flexible tube on the sampling inlet to the sam-
pling tube on the base pan.
ADDITIONAL APPLICATION DATA
Refer to Factory-Installed Smoke Detectors for Small and Me-
dium Rooftop Units 2 to 25 Tons for discussions on additional
control features of these smoke detectors, including multiple
unit coordination.
Step 1
Table 25 — VFD Unit Parameters - 48LC 07 Units (cont)
TERMINAL 53
LOW
HIGH
VOLTAGE
6-10
6-11
2
[10]
2
[10]
2
[10]
2
[10]
2
[10]
2
[10]
2
[10]
2
[10]
2
[10]
OF
RETURN AIR
Fig. 67 — Completing Installation of Return Air Smoke Sensor
TERMINAL 53
TERMINAL 53
LOW
HIGH
REFERENCE
REFERENCE
6-14
6-15
0
[60]
0
[60]
0
[60]
0
[60]
0
[60]
0
[60]
0
[60]
0
[60]
0
[60]
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 66 — Return Air Smoke Detector,
Step 2
53
AUTO.
RESET
RESTART
MODE
TIME (S)
14-20
14-21
[3]
600
[3]
600
[3]
600
[3]
600
[3]
600
[3]
600
[3]
600
[3]
600
[3]
600
Shipping Position
Step 3
RFI
FILTER
14-50
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
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