Carrier 48LC Series Installation Instructions

41
Table 5 – LEDs
The LEDs on the RTU Open show the status of certain functions
If this LED is on...
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 cont rol 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 3flashes,thenoff Control module has just been formatted
2 flashes per second
4flashes,
then pause
Two or more devices on this network have the
same ARC156 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 sol utions:
S TurnRTUOpenoff,thenon.
S Format RTU Open.
S Download memory to RTU Open.
S Replace RTU Open.
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. 69.)
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. 69. 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. 69 -- 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 the return--air enthalpy sensor (33SENTSEN) in
the return--air section of the economizer. The return air
sensor is wired to the enthalpy controller
(33CSENTHSW). See Fig. 70.
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. 70 -- Outside and Return Air Enthalpy Sensor
Wiring
48HC48LC

Carrier 48LC Series Specifications

General

Brand	Carrier
Model	48LC Series
Category	Air Conditioner
Language	English