Carrier 48TC Instruction Manual download pdf (Page 39)

Table 9 – 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 control module and netwo rk stat us

If Run LED shows...

And Error LED shows... Status is...

2 flashes per second Off Normal

2 flashes per second

2flashes,

alternating with Run LED

Five minute auto---restart delay after system error

2 flashes per second

3flashes,

then off

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.

NOTE: Refer to Catalog No. 48--50HCTQ--01T for

complete configuration of RTU Open, operating sequences

and troubleshooting information. Refer to RTU Open

Controller Integration Guide (Catalog No. 11--808--428--01)

for details on configuration and troubleshooting of connected

networks. Have a copy of these manuals available at unit

start--up.

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).

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

The outdoor enthalpy changeover setpoint is set at the

enthalpy 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.

48TC

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Carrier 48TC Instruction Manual Page 39

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