Outdoor Air Enthalpy Control; Differential Enthalpy Control - Carrier 50KCQ Installation Instructions Manual

If this LED is on...
Power
Rx
Tx
BO#
The Run and Error LEDs indicate control module and network status
If Run LED shows...
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
sequences 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

(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. 62.)
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. 62. Connect the enthalpy
control power input terminals to economizer actuator power
leads RED (connect to 24V) and BLK (connect to GND).
Table 9 – LEDs
The LEDs on the RTU Open show the status of certain functions
Status is...
The RTU Open has power
The RTU Open is receiving data from the network segment
The RTU Open is transmitting data over the network segment
The binary output is active
And Error LED shows...
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
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 MSTP 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:
S Turn the RTU Open off, then on.
S Format the RTU Open.
S Download memory to the RTU Open.
S Replace the RTU Open.
Enthalpy
Switch
24V RED
GND BLK
LOW GRA
Factory Wiring Harness
Fig. 62 - - 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.
35
PL6-1 (24-V)
PL6-4 (COM)
7 CTB ECON
(P'LINK: to J4-2) or
(RTU Open: to J2-6)
C11160