Outdoor Air Enthalpy Control - Carrier WeatherMaker 48TC 06 Installation Instructions Manual

IF THIS LED IS ON...
Power
Rx
Tx
DO#
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
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
(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).
Enthalpy
Switch
24V RED
GND BLK
LOW GRA
FACTORY WIRING HARNESS
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
Table 31 — LEDs
(The LEDs on the RTU Open show the status of certain functions)
THE STATUS IS...
RTU Open has power
RTU Open is receiving data from the network segment
RTU Open is transmitting data over the network segment
The digital output is active
The Run and Error LEDs indicate control module and network status
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
ENTHALPY CONTROL
PL6-1 (24-V)
PL6-4 (COM)
7 CTB ECON
(P'LINK: to J4-2) or
(RTU Open: to J2-6)
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
ARC156
Network address
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:
• Turn RTU Open off, then on
• Format RTU Open
• Download memory to RTU Open
• Replace RTU Open
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.
– 4-20
MAIN
+ VDC
OUT
OUTSIDE AIR
ENTHALPY SWITCH
+ 24-36
VDC IN
– 4-20 MAIN
OUT
Fig. 79 — Outside and Return Air Enthalpy Sensor
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.
55
24V RED PL6-1 (24-V)
GND BLK PL6-4 (COM)
CTB ECON
LOW GRA 7
(P'LINK: to J4-2) or
(RTU Open: to J2-6)
RETURN AIR
ENTHALPY
SENSOR
Wiring