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W7212 Economizer Logic Modules are used with CO2 Demand Control Ventilation (DCV) Sensors, and solid state C7400A Enthalpy Sensors or C7660 Dry Bulb Temperature Sensors. All models proportion outdoor and return air dampers for control of free cooling in commercial HVAC equipment.


  • Operates from commercial thermostat and DCV sensor to provide a totally integrated control system.
  • Mounts on M7215 Motor or ductwork.
  • The W7212 is used with Honeywell Series 72 actuators.
  • Combines minimum and DCV maximum damper position potentiometers with compressor staging relay.
  • Functions with solid state enthalpy or dry bulb changeover control.
  • Terminals included for connecting optional S963B1128 Remote Potentiometer for remote minimum damper position control.
  • LED indicates when free cooling is available.
  • LED indicates when module is in DCV mode.
  • LED indicates when exhaust fan contact is closed.
  • W7212C with additional "E" enthalpy curve.

Product Specifications

Dimensions (in.)
4 1/8 in. high x 4 3/8 in. wide x 1 5/8 in. deep
Dimensions (mm)
105 mm high x 111 mm wide x 41 mm deep
Used With
Honeywell Series 72 actuators; C7232; C7632
Can be used with C7400A Enthalpy or C7660 Dry Bulbs and C7232 CO2 sensors for Demand Control Ventilation; Accepts inputs from discharge or mixed air temperature sensors. Default minimum position in freeze protection
Item Type
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL Listed File: E4436, Guide: XAPX, Meets UL873 plenum requirements
Operating Humidity Range (% RH)
5 to 95% RH, non-condensing
Contact Ratings
30 Vac-- 1.5 A Run, 3.5 A Inrush
24 Vac
Operating Temperature Range (F)
-40 F to +149 F
Operating Temperature Range (C)
-40 C to +65 C
Approvals, CE
CE Report: GV02-003
Approvals, Others
Complies with California Title 24
2-10 Vdc to actuator
Use with Sensor
Dry Bulb Temperature sensor: C7660; Mixed Air Temperature sensor: C7150; CO2 sensor: C7232; Enthalpy Sensor: C7400A
Approvals, C-Tick
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