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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 shut-
down 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 ac-
tivity 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.
RTU Open Controller (Factory Option)
For details on operating 50FCQ*04-07 units equipped with the
factory-installed RTU Open controller option refer to the Factory-
Installed Option RTU Open Multi-Protocol Controller Controls,
Start-Up, Operation and Troubleshooting manual.
SystemVu™ Controller (Factory Option)
For details on operating 50FCQ*04-07 units equipped with the
factory-installed SystemVu controller option refer to the
FCQ/GCQ Series Single Package Rooftop Units with SystemVu
Controller Controls, Start-up, Operation and Troubleshooting
manual.
Controller Options
LOW AMBIENT
If the unit comes with Electro-Mechanical (EM) control, then no
adjustment is necessary.
If the unit comes with SystemVu or RTU Open controller option,
then refer to its installation control 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
50FCQ models. Smoke detectors may be specified for Supply Air
only or 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 components
necessary for operation are factory-provided and mounted. The
unit is factory-configured for immediate smoke detector 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 detectors
require a relocation of the sensor module at unit installation. See
Fig. 53 for the as-shipped location.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 53 — Return Air Smoke Detector,
Shipping Position
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.
Step 12 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Unit Control Board
(UCB), at terminals marked "Smoke Shutdown." Detach the
jumper covering the Smoke Shutdown terminals on the UCB and
then attach the wiring harness from the smoke detector.
ECONOMI$ER IV OCCUPANCY SWITCH
See Fig. 55 on page 45 for general EconoMi$er
nal occupancy control is managed through a connection on the
Unit Control Board.
If external occupancy control is desired, connect a time clock or
remotely controlled switch (closed for Occupied, open for Unoc-
cupied sequence) at terminals marked OCCUPANCY. Detach the
jumper covering the "Occupancy" terminals on the UCB and then
attach the required connections.
44
IV wiring. Exter-
®
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