Solid State Enthalpy Controller, w/ W7459 and C7400A Zoom

Solid State Enthalpy Controller, w/ W7459 and C7400A


Brand: Honeywell

H705A1003 has been discontinued.
Please contact customer service at
(888) 757-4774 for help finding an alternative.


20-28V at 60 Hz
20-26V at 50 Hz
Frequency: 50 Hz
50-60 Hz
Temperature Range (F): 45°-95°F
Accessory For: Series 90 Motors

Description for Honeywell H705A1003

The H705 Solid State Enthalpy Controller maximizes the use of free outdoor air in place of the first stage of cooling in heating, ventilating and air conditioning (HVAC) economizer systems.


  • Consists of a W7459A type solid state economizer logic module and a C7400A Solid State Enthalpy Sensor on a mounting plate.
  • Mounts in any position in outdoor air duct.
  • Use enthalpy setpoint to select desired combination of air temperature and humidity.
  • Use a second C7400A Sensor for differential changeover control to maximize savings.
  • Maximizes use of outdoor air for free cooling.
  • Use in electronic and electromechanical systems.

    SPDT - terminals 1 and 2 make with enthalpy increase above setpoint; terminals 2 and 3 make with enthalpy decrease.

  • Solid State Enthalpy Controller, w/ W7459 and C7400A

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