Carrier WeatherMaster Series - Outdoor Air Enthalpy Control; Differential Enthalpy Control; Return Air Enthalpy Sensor

63
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---rest art delay after system error
2 flashes per second 3flashes,thenoff 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 solutio ns:
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 access ory to be used with the EconoMi$er
R
2
damper system. The outdoor air enthalpy sensor is part of
the enthalp y control. (The separate field--installed accesso ry
return air enthalpy sensor [33CSENTSEN] is required for
differential enthalpy control. See Fig. 84.)
Locate the enthalpy control in the economizer next to the
Actuato r Moto r. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 84. 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.
7
CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
LOW
GND
24V
Enthalpy
Switch
GRA
BLK
RED
Factory Wiring Harness
PL6-1 (24-V)
PL6-4 (COM)
C11160
Fig. 84 -- Enthalpy Switch (33CSENTHSW) Connections
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 t he return --air entha lpy sensor (33CSENTSEN)
in the return-- air section of the economizer. The return
air sensor is wired to the enthalpy controller
(33CSENTHSW). See Fig. 85.
GRA
BLK
RED
– 4-20
Main
+ VDC
Out
– 4-20 Main
Out
+ 24-36
VDC In
LOW
GND
24V
7
PL6-1 (24-V)
PL6-4 (COM)
Outside Air
Enthalpy Switch
Return Air
Enthalpy
Sensor
CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
C11161
Fig. 85 -- Outside and Return Air Enthalpy Sensor
Wiring