Economi$Er X (Factory Option) - Carrier 48GC 04-06 Series Service And Maintenance Instructions

EconoMi$er X (Factory Option)

The EconoMi$er X system is an expandable economizer control
®
system, which includes a W7220 economizer module (controller)
with an LCD and keypad (see Fig. 75). The W7220 can be config-
ured with optional sensors. See Fig. 76 for wiring.
Fig. 75 — W7220 Economizer Module
The W7220 economizer module can be used as a stand-alone
economizer module wired directly to a commercial set-back space
thermostat and sensors to provide outside air dry-bulb economizer
control.
The W7220 economizer module can be connected to optional sen-
sors for single or differential enthalpy control. The W7220 econo-
mizer module provides power and communications for the sen-
sors.
The W7220 economizer module automatically detects sensors by
polling to determine which sensors are present. If a sensor loses
communications after it has been detected, the W7220 economizer
controller indicates a device fail error on its LCD.
SYSTEM COMPONENTS
The EconoMi$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.
Fig. 76 — Typical EconoMi$er
Economizer Module
The module is the core of the EconoMi$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.
S-Bus Enthalpy Control Sensors
The sensor is a combination temperature and humidity sensor
which is powered by and communicates on the S-Bus. Up to
3 sensors may be configured with the W7220 economizer module.
CO Sensor (optional)
2
The sensor can be added for Demand Controlled Ventilation
(DCV).
SPECIFICATIONS
W7220 Economizer Module
The module is designed for use with 2 to 10 vdc or bus communi-
cating actuator. The module includes terminals for CO
Mixed Air sensor, and an Outdoor Dry Bulb sensor. Enthalpy and
other options are available with bus sensors.
User Interface
Provides status for normal operation, setup parameters, checkout
tests, and alarm and error conditions with a 2-line 16 character
LCD display and 4 button keypad.
Electrical
• Rated Voltage — 20 to 30 Vac RMS, 50/60 Hz
• Transformer — 100 va maximum system input
• Nominal Power Consumption (at 24 Vac, 60 Hz) —
11.5 VA without sensors or actuators
• Relay Digital Output Rating at 30 Vac (maximum power
from Class 2 input only) — 1.5A run:
3.5A inrush at 0.45PF (200,000 cycles) or
7.5A inrush at 0.45PF (100,000 cycles)
• External Sensors Power Output — 21 vdc ± 5% at 48 mA
IMPORTANT: All inputs and outputs must be Class 2
wiring.
®
X (W7220 Controller) Wiring
47
sensor,
2