Honeywell Design and Application - Page 111

Section 11 - W7220 JADE™ Economizer Module
105 Honeywell Economizers 63-8594-02
Representative Locations of Connected W7220 Economizer System Devices
DIRECT
EXPANSION
COIL
C7400S
C7232
ENTHALPY
SENSOR
C7400S
ENTHALPY
SENSOR
RETURN AIR
OUTDOOR
AIR
C7250
MIXED AIR
SENSOR
FOR DIFFERENTIAL ENTHALPY, THE TWO C7400S ENTHALPY SENSORS
ARE CONNECTED TO THE ECONOMIZER MODULE—ONE IS MOUNTED
IN THE RETURN AIR DUCT, AND THE OTHER IS MOUNTED IN THE
OUTDOOR AIR DUCT. DIFFERENTIAL ENTHALPY CONTROL PROVIDES
GREATER ENERGY SAVINGS THAN SINGLE ENTHALPY CONTROL.
M22814B
INDOOR
AIR CO2
SENSOR
EXHAUST AIR
DISCHARGE
AIR
INDOOR
FAN
EXHAUST
FAN
M7215
MOTOR
1
1
1
ECONOMIZER
CONTROLLER
W7220