Bryant Legacy 549J 12 Series, Руководство по установке

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TROUBLESHOOTING
Alarms
The economizer module provides alarm messages that display
on the 2-line LCD.
NOTE: Upon power up, the module waits 60 minutes before
checking for alarms. This allows time for all the configured devic -
es (e.g. sensors, actuator) to become operational. The exception is
the SAT sensor which will alarm immediately.
If one or more alarms are present and there has been no keypad
activity for at least 5 minutes, the Alarms menu displays and
cycles through the active alarms.
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.
Smoke Detectors
Smoke detectors are available as factory-installed options on
549J models. Smoke detectors may be specified for supply air
only, return air without or with economizer, or in combination
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 shut -
down operation; additional wiring or modifications to unit
terminal 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. 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.
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.
Fig. 51 — Return Air Smoke Detector,
Shipping Position
Fig. 52 — Completing Installation of Return Air Smoke Sensor
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
STEP 1 STEP 2 STEP 3