33
Fig. 45 — Typical Rooftop Unit with Humidi-MiZer Adaptive Dehumidification System
with Edge Pro Thermidistat Device
EconoMi$er
®
X (Factory-Installed Option)
PRODUCT DESCRIPTION
The EconoMi$er X system is an expandable economizer control
system, which includes a W7220 economizer module (controller)
with an LCD and keypad (see Fig. 46). The W7220 module can be
configured with optional sensors.
Fig. 46 — 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.
S-Bus Enthalpy Control Sensors
The S-Bus enthalpy control sensors are a combination temperature
and humidity sensor which is powered by and communicates on
the S-Bus. Up to three sensors may be configured with the W7220
economizer module. See page 34 for details.
CO
2
Sensor (optional)
This 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
2
sensor,
Mixed Air sensor, and an outdoor dry bulb sensor. Enthalpy and
other options are available with bus sensors.
User Interface
This provides status for normal operation, setup parameters,
checkout tests, and alarm and error conditions with a 2-line 16
character LCD display and four 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 with-
out sensors or actuators
Rc
Rh
W1
G
Y2
C
O/W2/B
Y1
OAT
RRS
SRTN
HUM
D1
D2
V+
Vg
X*
C
G
W2
W1
Y2
Y1
R
EDGE Pro THERMIDISTAT
Unit CTB
THERMOSTAT
*Connection not required.
Humidi-MiZer
®
FIOP
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