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You can also navigate to the Alarms menu at any time.
Clearing Alarms
Once the alarm has been identified and the cause has been re-
moved (e.g. replaced faulty sensor) the alarm can be cleared
from the display.
To clear an alarm, perform the following:
1.
Navigate to the desired alarm.
2.
Press the
(Enter) button. ERASE? displays.
3.
Press the
(Enter) button. ALARM ERASED displays.
4.
Press the
(Menu up/Exit) button to complete the
action and return to the previous menu.
NOTE: If the alarm still exists after clearing it, it is redisplayed
within 5 seconds.
RTU OPEN CONTROL SYSTEM
For details on operating units equipped with the factory-in-
stalled RTU Open controller, refer to the "Factory-Installed
RTU Open Multi-Protocol Controller Control, Start-Up, Oper-
ation and Troubleshooting" manual.
Smoke Detectors
Smoke detectors are available as factory-installed options on
548J 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 unit terminal board
may be necessary to complete the unit and smoke detector con-
figuration 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. 51 for the as-shipped location.
COMPLETING
INSTALLATION
SMOKE SENSOR
1.
Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 52, Step 1. Save the screws.
Step 1
OF
RETURN AIR
Fig. 52 — Completing Installation of Return Air Smoke Sensor
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.
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.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 51 — Return Air Smoke Detector
Step 2
40
(Shipping Position)
Step 3
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Troubleshooting
