47
Table 24 – LEDs
The LEDs on the RTU Open Controller show the status of certain functions
If this LED is on...
Status is...
Power
The RTU Open controller has power
Rx
The RTU Open controller is receiving data from the network segment
Tx
The RTU Open controller is transmitting data over the network segment
BO#
The binary 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
2 flashes, alternating with
Run
LED
Five minute auto---restart delay after system error
2 flashes per second
3 flashes, then off
Control module has just been formatted
2 flashes per second
4 flashes, then pause
Two or more devices on this network have the
same MSTP network address
2 flashes per second
On
Exec halted after frequent system errors or
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 Open controller off, then on.
S
Format the RTU Open controller.
S
Download memory to the RTU Open controller.
S
Replace the RTU Open controller.
Outdoor Air Enthalpy Control
(P/N 33CSENTHSW)
The enthalpy control (33CSENTHSW) is available as a
field--installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field--installed
accessory return air enthalpy sensor (33CSENTSEN) is
required for differential enthalpy control. See Fig. 59.)
7
CTB ECON
(RTU Open: to J2-6)
LOW
GND
24V
Enthalpy
Switch
GRA
BLK
RED
Factory Wiring Harness
PL6-1 (24-V)
PL6-4 (COM)
C11169
Fig. 59 -- Enthalpy Switch (33CSENTHSW) Connections
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 59. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing and
comparing the outside air and return air enthalpy
conditions. Install the outdoor air enthalpy control as
described above. Add and install a return air enthalpy
sensor.
Return Air Enthalpy Sensor —
Mount the return--air enthalpy sensor (33CSENTSEN) in
the return--air section of the economizer. The return air
sensor
is
wired
to
the
enthalpy
controller
(33CSENTHSW). See Fig. 60.
GRA
BLK
RED
–
4-20
Main
+
VDC
Out
–
4-20 Main
Out
+
24-36
VDC In
LOW
GND
24V
7
CTB ECON
(RTU Open: to J2-6)
PL6-1 (24-V)
PL6-4 (COM)
Outside Air
Enthalpy Switch
Return Air
Enthalpy
Sensor
C11170
Fig. 60 -- Outside and Return Air Enthalpy Sensor
Wiring
Summary of Contents for 549J Series
Page 4: ...4 C160144 Fig 2 Unit Dimensional Drawing 07 08 Size Units ...
Page 5: ...5 C160145 Fig 2 Unit Dimensional Drawing 07 08 Size Units cont ...
Page 6: ...6 C10757A Fig 3 Unit Dimensional Drawing 09 Size Units ...
Page 7: ...7 C10758A Fig 3 Unit Dimensional Drawing 09 Size Unit cont ...
Page 40: ...40 a549J 001 Fig 44 Typical RTU Open Controller Wiring Diagram ...
