Bryant 581J Outdoor Air Enthalpy Control PNO 33CSENTHSW, LEDs, Differential Enthalpy Control

		Table 4 – 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 network status

If Run LED shows...	And Error LED shows...
2 flashes per second	Off
2 flashes per second	2 flashes,
	alternating with Run LED
2 flashes per second	3 flashes,
	then off
2 flashes per second	4 flashes,
	then pause
2 flashes per second	On
5 flashes per second	On
5 flashes per second	Off
7 flashes per second	7 flashes per second, alternating with
	Run LED
14 flashes per second	14 flashes per second,
	alternating with Run LED
On	On

Status is...

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 halted after frequent system errors or control programs halted

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:

STurn RTU Open off, then on. S Format RTU Open.

S Download memory to RTU Open. S Replace RTU Open.

581J

NOTE: Refer to Catalog No. TS-5580J-01 for complete configuration of RTU Open operating sequences. Contact your Bryant applications engineer for details on configuration and troubleshooting of connected networks.

Outdoor Air Enthalpy Control (PNO 33CSENTHSW)

Enthalpy
Switch
24V	RED
GND	BLK
LOW	GRA

PL6-1 (24-V)

PL6-4 (COM)

7CTB ECON

(RTU Open: to J2-6)

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. 53.)

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. 53. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to 24V) and BLK (connect to GND).

Factory Wiring Harness

C11169

Fig. 53 - 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.

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