Outdoor Air Enthalpy Control; Smoke Detectors - Carrier WeatherMaster 50HC14 Installation Instructions Manual

The LEDs on the RTU Open Control Board (see Fig. 79) show the status of certain functions
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
Outdoor Air Enthalpy
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 re-
turn air enthalpy sensor (33CSENTSEN) is required for dif-
ferential enthalpy control. See Fig. 93.)
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 la-
beled "LOW." See Fig. 94. Connect the enthalpy control
power input terminals to economizer actuator power leads
RED (connect to 24-v) and BLK (connect to GND).
The outdoor enthalpy changeover setpoint is set at the en-
thalpy controller.
Enthalpy
Switch
24V RED
GND BLK
LOW GRA
FACTORY WIRING HARNESS
Fig. 93 — 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 (33CSENTSEN) in the
return-air section of the economizer. The return air sensor is
wired to the enthalpy controller (33CSENTHSW). See Fig. 94.
Table 26 — LEDs
Status is...
The RTU Open controller has power
The RTU Open controller is receiving data from the network segment
The RTU Open controller 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 Brownout
On
Control (P/N
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
MSTP network address
Exec halted after frequent system errors or control pro-
grams halted
Exec start-up aborted, Boot is running
Firmware transfer in progress, Boot is running
Ten second recovery period after brownout
Failure. Try the following solutions:
· Turn the RTU Open controller off, then on.
· Format the RTU Open controller.
· Download memory to the RTU Open controller.
· Replace the RTU Open controller.
– 4-20
MAIN
+ VDC
OUT
OUTSIDE AIR
ENTHALPY SWITCH
+ 24-36
VDC IN
– 4-20 MAIN
OUT
Fig. 94 — Outside and Return Air Enthalpy Sensor
To wire the return air enthalpy sensor, perform the following:
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
controller.
2. Connect the field-supplied RED wire to (+) spade con-
nector on the return air enthalpy sensor and the (+) termi-
nal on the enthalpy controller. Connect the BLK wire to
(–) spade connector on the return air enthalpy sensor and
the ( ) terminal on the enthalpy controller.
–

Smoke Detectors

Smoke detectors are available as factory-installed options
on 50HC**14 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 Return Air. Return Air
smoke detectors are arranged for vertical return configura-
tions only. All components necessary for operation are facto-
ry-provided and mounted. The unit is factory-configured for
immediate smoke detector shutdown operation; additional
wiring or modifications to unit terminal board may be neces-
sary to complete the unit and smoke detector configuration to
meet project requirements.
60
Status is...
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