Troubleshooting; Rtu Open Controller (Factory-Installed Option); Smoke Detectors; Additional Application Data - Bryant Preferred Series Installation Instructions Manual

CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Be sure to allow enough time for compressor start-up and
shutdown between checkout tests so that you do not short-
cycle the compressors.

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.
If the alarm still exists after clearing it, it is redisplayed within
5 seconds.

RTU Open Controller (Factory-Installed Option)

For details on operating 551J 04-06 units equipped with the
factory-installed RTU Open controller refer to the Factory-In-
stalled RTU Open Multi-Protocol Controller Control, Start-
Up, Operation and Troubleshooting manual.

Smoke Detectors

Smoke detectors are available as factory-installed options on
551J 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 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. 53 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. 54, 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. 54, Step 2.
3. Screw the sensor and detector plate into its operating position
using screws from Step 1. See Fig. 54, 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.

CONTROLLER OPTIONS

Low Ambient
If the unit comes with Electro-Mechanical (EM) control, then
no adjustment is necessary.
If the unit comes with the RTU Open control option, refer to its in-
stallation control manual for details on adjusting "Cooling Lock-
Out" setting and configure for the specific job requirements.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 53 — Return Air Smoke Detector,
Shipping Position
39