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Environmental & Combustion Controls
Logic Modules
Using a combination of sensors and actuators, Honeywell's Solid State Economizer Logic Modules determine whether or not Free-Cooling can be used by bringing in outdoor air instead of energizing a compressor. Some Logic Modules control based upon DCV using a CO2 sensor.

Compare Select and Compare the Product Models below.  Limited to five.  Some groupings may not be comparable.
  
H205
Electro-mechanical Enthalpy Sensor with SPDT switch
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H705
Provides solid state enthalpy changeover control in economizer systems.
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W7210
Solid State Economizer Logic Modules. Use with 2 to 10 Vdc actuators.
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W7212
Demand Control Ventilation Economizer Logic Modules
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W7213
Demand Control Ventilation Economizer Logic Modules
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W7214
Demand Control Ventilation Economizer Logic Modules
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W7215
Enhanced Solid State Economizer Logic Modules with inputs for IAQ from a Carbon Dioxide Sensor (C7232). Use with 2 to 10 Vdc actuators.
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W7459
Solid State Economizer Control Packages. Models available for use with T7300 (2-stage cooling thermostat) and W7401/7411 Direct Digital Control.
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W7499
Consists of a W7459 Solid State Economizer Logic Module with a M7415 actuator.
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W859
Economizer Control Packages. Models available with dry-bulb or enthalpy changeover. Contain all the controls require to operate an outdoor return air damper system when used with the M91xx Modutrol Motor.
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Logic Modules Parts and Accessories
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Compare Select and Compare the Product Models above.  Limited to five.  Some groupings may not be comparable.
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Output
2-10 Vdc to actuatorOutput for M7415
Resistive output to M7415 motor or contact output to unit for mechanical coolingSeries 90
Two SPDT one 2-10VdcTwo SPDT, one floating.
Input
Air Quality SensorDischarge Air Temperature controller: T675 or T6031
Discharge Air Temperature sensor: C7150 or C7046Dry Bulb Temperature sensor C7660, or Enthalpy sensor C7400A, or Mixed Air Temperature sensor C7150
Dry Bulb Temperature sensor: C7660Dry Bulb Temperature sensor: C7660; Mixed Air Temperature sensor: C7150
Dry Bulb Temperature sensor: C7660; Mixed Air Temperature sensor: C7150; CO2 sensor: C7232Dry Bulb Temperature sensor: C7660; Mixed Air Temperature sensor: C7150; CO2 sensor: C7232; B-B1 terminals for heat pump
Dry Bulb Temperature sensor: C7660; Mixed Air Temperature sensor: C7150; CO2 sensor: C7233Enthalpy Sensor: C7400
Enthalpy Sensor: C7400AEnthalpy Sensor: C7400C
See commentsY1 and Y2 from thermostat
Use with Sensor
C7046C7150
C7232C7400
C7400AC7660
May add a second C7400 sensor for differential control
Differential Temperature (F)
2 degrees F at 50% RH, 10% RH at 60 degrees F2%RH at the following conditions: Diff. 6% max. when measured at 12%RH/hr. when RH control midpoint is 45% to 55% RH and temperature is constant between 70 and 80 degrees F.
Operating Humidity Range (% RH)
10 to 80% RH20 to 90% RH
5 to 95% RH5 to 95% RH, non-condensing
6 to 95% RH, non-condensing
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Related Information
Check out Economizer Simulator
Click the link, then navigate to the "Economizer Logic Module (W7212) Simulator and Demand Control Ventilation Savings-Estimator" page