Bryant 548J A Series Installation Instructions Manual page 25

If this LED is on...
Power
Rx
Tx
DO#
If Run LED shows...
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
5 flashes per second
5 flashes per second
7 flashes per second
14 flashes per second
On
NOTE: Contact your Bryant applications engineer for
details on configuration of RTU- - MP, operating sequences
and troubleshooting information, as well as details on
configuration and troubleshooting of connected networks.
SMOKE DETECTORS
Smoke detectors are available as factory- - installed options
on 548J***A models. Smoke detectors may be specified
for Supply Air only or for Return Air without or with
economizer or in combination 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
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 "Completing Installation of Return Air
Smoke Sensor:" on page 27 for details.
Table 4 – LEDs
The LEDs on the RTU- - MP show the status of certain functions
Status is...
The RTU MP has power
The RTU MP is receiving data from the network segment
The RTU MP is transmitting data over the network segment
The digital output is active
The Run and Error LEDs indicate control module and network status
And Error LED shows...
Off
2 flashes,
alternating with Run LED
3 flashes,
then off
4 flashes,
then pause
On
On
Off
7 flashes per second, alternating with
Run LED
14 flashes per second,
alternating with Run LED
On
immediate smoke detector
Status is...
Normal
Five minute auto---restart delay after system error
Control module has just been formatted
Two or more devices on this network have the
same ARC156 network address
Exec halted after frequent system errors or
control programs halted
Exec start---up aborted, Boot is running
Firmware transfer in progress, Boot is running
Ten second recovery period after brownout
Brownout
Failure. Try the following solutions:
Turn the RTU ---MP off, then on.
S
Format the RTU ---MP .
S
Download memory to the RTU ---MP .
S
Replace the RTU ---MP .
S
System
The smoke detector 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 circulating throughout the building. It is not to be
used as a life saving device.
Controller
The controller (see Fig. 46) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
housing with a single captive screw for easy access to 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. 47) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube inlet and an exhaust tube. The sampling tube (when
used) and exhaust tube are attached during installation.
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 captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
25