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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. 35). The
W7220 can be configured with optional sensors.
Fig. 35 — 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 op-
tional sensors for single or differential enthalpy control. The
W7220 economizer module provides power and communica-
tions for the sensors.
The W7220 economizer module automatically detects sen-
sors 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 interface for the system. The
W7220 economizer module provides the basic inputs and out-
puts to provide simple economizer control. When used with the
optional sensors, the economizer module provides more ad-
vanced economizer functionality.
S-Bus Enthalpy Control Sensors: The sensor is a combina-
tion temperature and humidity sensor which is powered by and
communicates on the S-Bus. Up to three sensors may be con-
figured with the W7220 economizer module.
CO
Sensor (optional): The sensor can be added for Demand
2
Controlled Ventilation (DCV).
SPECIFICATIONS
W7220 Economizer Module: The module is designed for use
with 2 to 10 Vdc or bus communicating actuator. The module
includes terminals for CO
2
Outdoor Dry Bulb sensor. Enthalpy and other options are avail-
able with bus sensors.
User Interface: Provides status for normal operation, setup pa-
rameters, 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
sensor, Mixed Air sensor, and an
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 48mA
IMPORTANT: All inputs and outputs must be Class 2
wiring.
INPUTS
Sensors:
NOTE: A Mixed Air (MA) analog sensor is required on all
W7220 units; either an Outdoor Air (OA) sensor for dry bulb
change over or an OA bus sensor for outdoor enthalpy change
over is required in addition to the MA sensor. An additional
Return Air (RA) bus sensor can be added to the system for dif-
ferential enthalpy or dry bulb changeover. For differential dry
bulb changeover a 20k ohm sensor is required in the OA and a
bus sensor in the RA. DIP switch on RA bus sensor must be
set in the RA position.
Dry Bulb Temperature (optional) and Mixed Air (required),
20k NTC
2-wire (18 to 22 AWG);
Temperature range -40 to 150°F (-40 to 65°C)
Temperature accuracy -0°F/+2°F
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range -40 to 150°F (-40 to 65°C)
Temperature accuracy -0°F/+2°F
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (3) S-Bus sensors may be connected to the
W7220 economizer module. For outdoor air (OA), return air
(RA) and discharge (supply) air (DA).
4 Binary Inputs
1-wire 24 Vac + common GND.
24 Vac power supply
20 to 30 Vac 50/60Hz; 100 VA Class 2 transformer.
OUTPUTS
Actuator Signal: 2-10 Vdc; minimum actuator impedance is
2k ohm; bus two-wire output for bus communicating actuators.
Exhaust fan, Y1, Y2 and AUX1 O:
All Relay Outputs (at 30 Vac):
Running: 1.5A maximum
Inrush: 7.5A maximum
ENVIRONMENTAL
Operating Temperature:
-40 to 150°F (-40 to 65°C).
Exception of display operation down to -4°F with full
recovery at -4°F from exposure to -40°F
Storage Temperature:
-40 to 150°F (-40 to 65°C)
Shipping Temperature:
-40 to 150°F (- 40 to 65°C)
Relative Humidity:
5% to 95% RH non-condensing
21
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