Carrier WeatherMaker 48TC 04, Installation Instructions Manual

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Table 31 — LEDs
(The LEDs on the RTU Open show the status of certain functions)
NOTE: Refer to the RTU Open Multi-Protocol Controller
Controls, Start-Up, Operation and Troubleshooting manual
for complete configuration of RTU Open, operating se-
quences 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
(P/N 33CSENTHSW) — The enthalpy control 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. 78).
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. 78. Connect the enthalpy control power input
terminals to economizer actuator power leads RED (connect to
24V) and BLK (connect to GND).
Fig. 78 — Enthalpy Switch (33CSENTHSW)
Connections
The outdoor enthalpy changeover setpoint is set at the en-
thalpy controller.
Differential Enthalpy Control — Control is provided by sens-
ing 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 (33SENTSEN) — The sensor is
mounted in the return-air section of the economizer. The return
air sensor is wired to the enthalpy controller (33CSENTHSW).
See Fig. 79.
Fig. 79 — Outside and Return Air Enthalpy Sensor
Wiring
SMOKE DETECTORS — Smoke detectors are available as
factory-installed options on 48TC 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 Re-
turn Air. All components necessary for operation are factory-
provided and mounted. The unit is factory-configured for im-
mediate smoke detector 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 de-
tectors require a relocation of the sensor module at unit installa-
tion. See Fig. 80 for the as shipped location.
IF THIS LED IS ON... THE STATUS IS...
Power RTU Open has power
Rx RTU Open is receiving data from the network segment
Tx RTU Open is transmitting data over the network segment
DO# The digital output is active
The Run and Error LEDs indicate control module and network status
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
ARC156
2 Flashes Per Second On Network address
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:
•
Turn RTU Open off, then on
• Format RTU Open
• Download memory to RTU Open
• Replace RTU Open
7 CTB ECON
(P
’ LINK: to J4-2) or
(RTU Open: to J2-6)
LOW
GND
24V
Enth a lpy
S witch
GRA
BLK
RED
FACTORY WIRING HARNE SS
PL6-1 (24-V)
PL6-4 (COM)
GRA
BLK
RED
– 4-20
MAIN
+ VDC
OUT
– 4-20 MAIN
OUT
+ 24- 3 6
VDC IN
LOW
GND
24V
7
PL6-1 (24-V)
PL6-4 (COM)
OUT S IDE AIR
ENTHALPY S WITCH
RETURN AIR
ENTHALPY
S EN S OR
CTB ECON
(P
’ LINK: to J4-2) or
(RTU Open: to J2-6)