Carrier WeatherExpert 48LCD05 - Economizer System Setup and Operation

35
Fig. 45 — Low-Voltage Connections
UNIT WITHOUT THRU-BASE CONNECTION KIT
Pass the thermostat control wires through the hole provided in the
corner post; then feed the wires through the raceway built into the
corner post to the control box. Pull the wires over to the terminal
strip on the upper-left corner of the Controls Connection Board.
See Fig. 46.
NOTE: If thru-the-bottom connections accessory is used, refer to
the accessory installation instructions for information on routing
power and control wiring.
Fig. 46 — Field Control Wiring Raceway
HEAT ANTICIPATOR SETTINGS
Set heat anticipator settings at 0.14 amp for the first stage and
0.14 amp for second-stage heating, when available.
TRANSFORMER CONNECTION FOR 208-V POWER
SUPPLY
All units except 208/230-v units are factory wired for the voltage
shown on the nameplate. If the 208/230-v unit is to be connected
to a 208-v power supply, the control transformer must be rewired
by moving the black wire with the
1
/
4
-in. female spade connector
from the 230-v connection and moving it to the 208-v
1
/
4
-in. male
terminal on the primary side of the transformer. Refer to unit label
diagram for additional information.
RTU Open Control System
For details on operating units equipped with the factory-installed
RTU Open controller, refer to the “Factory-Installed RTU Open
Multi-Protocol Controller Control, Start-Up, Operation and Trou-
bleshooting” manual.
SystemVu™ (Factory Option)
For details on operating units equipped with the factory installed
SystemVu control option, refer to the 48/50LC 04-26 Single Pack-
age Rooftop Units with SystemVu Controls Version 2.X Controls,
Start-Up, Operation and Troubleshooting manual.
Economi$er
®
X (Factory Option)
The EconoMi$er X system is an expandable economizer control
system, which includes a W7220 economizer module (controller)
with an LCD and keypad (see Fig. 47). The W7220 can be config-
ured with optional sensors.
Fig. 47 — W7220 Economizer Module
The W7220 economizer module can be used as a stand-alone
economizer module wired directly to a commercial set-back space
thermostat and sensors to provide outside air dry-bulb economizer
control.
The W7220 economizer module can be connected to optional
sensors for single or differential enthalpy control. The W7220
economizer module provides power and communications for the
sensors.
The W7220 economizer module automatically detects sensors by
polling to determine which sensors are present. If a sensor loses
communications after it has been detected, the W7220 economizer
controller indicates a device fail error on its LCD.
SYSTEM COMPONENTS
The EconoMi$er X system includes an economizer module, 20k
mixed air sensor, damper actuator, and either a 20k outdoor air
temperature sensor or S-Bus enthalpy sensors.
Economizer Module
The module is the core of the EconoMi$er X system. The module
is mounted in the unit’s control box, and includes the user inter-
face for the system. The W7220 economizer module provides the
basic inputs and outputs to provide simple economizer control.
When used with the optional sensors, the economizer module pro-
vides more advanced economizer functionality.
X
C
G
W2
C
W2
G
W1
O/B/Y2
Y2
R
W1
R
Y1
Y1
T
H
E
R
M
O
S
T
A
T
(Note 1) (Note 2)
Note 1: Typical multi-function marking. Follow manufacturer’s conguration
Instructions to select Y2.
Note 2: Y2 to Y2 connection required for 2 stage cooling operation and when
integrated economizer function is desired.
Field Wiring
Central
Terminal
Board
Typical
Thermostat
Connections
RACEWAY
HOLE IN END PANEL (HIDDEN)