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Table 9 – LEDs
The LEDs on the RTU--MP show the status of certain functions
If this LED is on... Status is...
Power The RTU MP has power
Rx The RTU MP is receiving dat a from the network segment
Tx The RTU MP is transmitting data over the network segment
DO# The digital output is active
The Run and Error LEDs indicate control module and network status
If Run LED shows...
And Error LED shows... Status is...
2 flashes per second Off Normal
2 flashes per second
2flashes,
alternating with Run LED
Five minute auto---restart delay after system err or
2 flashes per second
3flashes,
then off
Control module has just been formatted
2 flashes per second
4flashes,
then pause
Two or more devices on this network have the
same ARC156 network address
2 flashes per second On
Exec halted after frequent system errors o r
control programs halted
5 flashes per second On Exec start---up aborted, Boot is running
5 flashes per second Off Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second, alternating with
Run LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second,
alternating with Run LED
Brownout
On On
Failure. Try the following solutions:
S Turn the RTU---MP off, then on.
S Format the R TU --- M P.
S Download memory to the RTU---MP.
S Replace the RTU---MP.
NOTE: Refer to Form 48 --50H--T--2T for complete
configuration of RTU--MP, operating sequences and
troubleshooting information. Refer to RTU-- MP 3rd Party
Integration Guide for details on configuration and
troubleshooting of connect ed networks. Have a copy of
these manuals available at unit start--up.
SMOKE DETECTORS
Smoke detectors a re available as factory--installed opt ions
on 50TCQ m odels. Smoke detectors may be specified for
Supply Air only or for Return Air without or with
econom izer or in c ombination 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 Re turn Air smoke
dete ctors require a relocation of the sensor module at unit
installation. See “Completing Installation of Return Air
Smoke Sensor:” on page 35 for details.
System
The smoke detect or system consists of a four--wire
controller and one or two sensors. Its primary function is
to shut down the rooftop unit in order to prevent smoke
from circul ating throughout the building. It is not to be
used as a life saving device.
Controller
The controller (see Fig. 58) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two c ompatible duct
smoke sensors. The clea r pla stic cove r is secured to the
housing with a single captive screw for easy access t o the
wiring terminals. The controller has three LEDs (for
Power, Trouble and Alarm) and a manual test/reset button
(on the cover face).
Sensor
The sensor (see Fig. 59) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube i nlet and an e xhaust tube. The sampli ng tube (when
used) and exhaust tube are attached during installa tion.
The sampling tube varies in length depending on the size
of the rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four c aptive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
50TCQA