8
W7220 ECONOMIZER MODULE
C14154
Fig. 4 -- W7220 Economizer Module
Product Description
This economizer system is an expandable economizer
control system, which includes a W7220 Economizer
Module (controller) with an LCD and keypad. The W7220
can be configured with optional sensors.
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 indicates a device fail
error on its LCD.
System Components
The EconoMi$er X system includes an Economizer module,
20k mixed air sensor, damper actuator, and either a 20k
outdoor air temperature sensor or S--Bus enthalpy sensors.
Economizer Module
This is the core of the EconoMi$er X System, 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 outputs to provide simple economizer
control. When used with the optional sensors, the
Economizer Module provides more advanced economizer
functionality.
S--Bus Enthalpy Control Sensors
The S--bus enthalpy control sensor is 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 11 for details.
CO
2
Sensor (optional)
ACO
2
sensor can be added for Demand Control
Ventilation (DCV).
Certified FDD Product
California Title 24, Part 6
www.energy.ca.gov
HJW10
E4436
C14159
C14160
C14161
SUP--TI24--02SI
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