Honeywell W7340 - Manual (Page 5)

W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES
5 63-2569—04
Fig. 4. Representative Locations of Connected W7340 Economizer System Devices.
Fig. 5. Representative Locations of Connected W7345 Economizer System Devices.
10K NTC
DISCHARGE
AIR SENSOR
DIRECT
EXPANSION
COIL
C7400
C7232
ENTHALPY
SENSOR
C7400
ENTHALPY
SENSOR
RETURN AIR
OUTDOOR
AIR
10K
NTC
MIXED AIR
SENSOR
FOR DIFFERENTIAL ENTHALPY, THE TWO C7400 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.
USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR, NOT BOTH.
A C7600 HUMIDITY SENSOR, USED IN CONJUNCTION WITH A 10K NTC
TEMPERATURE SENSOR CAN BE USED INSTEAD OF A C7400 ENTHALPY SENSOR.
FOR DRY BULB CONTROL, USE ONLY A 10K NTC TEMPERATURE SENSOR.
M22814
INDOOR
AIR CO2
SENSOR
MODBUS
EXHAUST AIR
DISCHARGE
AIR
INDOOR
FAN
EXHAUST
FAN
M7215 MOTOR
WITH W7340
ECONOMIZER
LOGIC MODULE
1
1
2
2
2
3
3
1
3
10K NTC
DISCHARGE
AIR SENSOR
DIRECT
EXPANSION
COIL
RETURN AIR
OUTDOOR
AIR
10K
NTC
MIXED AIR
SENSOR
USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR, NOT BOTH.
M22822
MODBUS
EXHAUST AIR
DISCHARGE
AIR
INDOOR
FAN
EXHAUST
FAN
M7215 MOTOR
WITH W7345
ECONOMIZER
LOGIC MODULE
1
1
1
1