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The LEDs on the RTU Open Controller show the status of certain functions
If this LED is on...
Power
Rx
Tx
BO#
The Run and Error LEDs indicate control module and network status
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
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. 54.)
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. 54. 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.
Enthalpy
Switch
24V
RED
GND
BLK
LOW
GRA
Factory Wiring Harness
Fig. 54 − Enthalpy Switch (33CSENTHSW) Connections
Table 7 – LEDs
Status is...
The RTU Open controller has power
The RTU Open controller is receiving data from the network segment
The RTU Open controller is transmitting data over the network segment
The binary output is active
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
PL6-1 (24-V)
PL6-4 (COM)
CTB ECON
7
(RTU Open: to J2-6)
C11169
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 MSTP 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:
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.
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
(33CSENTHSW). See Fig. 55.
24V
– 4-20
Main
GND
+ VDC
Out
LOW
Outside Air
Enthalpy Switch
+ 24-36
VDC In
– 4-20 Main
Out
Fig. 55 − Outside and Return Air Enthalpy Sensor
Wiring
34
the
enthalpy
controller
RED
PL6-1 (24-V)
BLK
PL6-4 (COM)
CTB ECON
GRA
7
(RTU Open: to J2-6)
Return Air
Enthalpy
Sensor
C11170
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