Table 9 - LEDs
The LEDs on the RTU Open show the status of certain functions
If this LED is on... Status is...
Power The RTU Open has power
Rx The RTU Open is receiving data from the network segment
Tx The RTU Open 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 Ten second recovery period after brownout
Run LED
14 flashes per second 14 flashes per second, Brownout
alternating with Run LED
On On
Failure. Try the following solutions:
• Turn the RTU Open off, then on.
• Format the RTU Open.
• Download memory to the RTU Open.
• Replace the RTU Open.
NOTE: Refer to the RTU Open Multi-Protocol Controller
Controls, Start-Up, Operation and Troubleshooting manual
for complete configuration of RTU Open, operating
sequences and troubleshooting information. Refer to the
RTU Open v3 Integration Guide for details on configuration
and troubleshooting of connected networks. Have a copy of
these manuals available at unit start-up
Outdoor Air Enthalpy Control
(PNO 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. 71.)
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. 71. Connect the enthalpy
control power input terminals to economizer actuator power
leads RED (connect to 24V) and BLK (connect to GND).
Enthalpy
Switch
GRA OTBEOON
t t_l (P'LINK: to J4-2) or
(RTU Open: to J2-6)
FactoryWiring Harness
Cl1160
Fig. 71 - Enthalpy Switch (33CSEN3_SW) Connections
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.
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