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Phason Staged Environment Control (SEC-HD)

QC Supply Part #: 11735
Shipping: Standard
Availability: In stock

A five-stage control with inlet actuator capability.


Phason's Heavy-Duty Staged Environment Control (SEC-HD) automatically controls temperature by operating two variable speed fans, and up to three single-speed fans or heaters. To control the temperature, it operates the connected ventilation and heating equipment according to programmed settings.

The SEC-HD comes with seven factory-configured operating programs you can easily reconfigure for your ideal situation. The easy-to-use keypad and menu system make it one of the easiest controls to program.

The SEC-HD has a 30' temperature probe that monitors temperatures in a single zone. For more versatility, you can connect 4 temperature probes together and use 4-zone averaging. You can connect it to an alarm siren or other external alarm system. Customizable alarm settings allow you to choose which alarm conditions you want to be notified about.


  • Automatic temperature-based control, range: -13° F - 125° F
  • 2 variable cooling stages for controlling fans
  • 3 general-purpose relays (heat or cool)
  • Alarm relay (for external alarm system or siren)
  • 7 configurable operating programs
  • Minimum and maximum temperature logging
  • Error code display
  • Ventilation disable option
  • Manual override/test mode
  • Selectable motor curves
  • 3-second full-power-turn-on to minimize fan ice-up
  • Power-failure settings protection
  • 1 temperature probe input
  • 30' temperature probe, extendable to 500'
  • Easy System compatible; use the optional SEC-HD Updater to update firmware, or the SEC-HD Saver to save or store settings and configuration
  • Rugged enclosure (corrosion resistant, water resistant and fire retardant)
  • CSA approval
  • 2-year limited manufacturer's warranty

Electrical Ratings:

  • Incoming Power: 120/230 VAC, 50/60 Hz
  • Variable Stages:
    • 10 A at 120/230 VAC, general-purpose (resistive)
    • 7 FLA at 120/230 VAC, PSC motor
    • 1/2 HP at 120 VAC, 1 HP at 230 VAC, PSC motor
    • Fuses: 15 A, 250 VAC ABC-type ceramic
  • Relays:
    • 6 A at 120/230 VAC, general-purpose (resistive)
    • 1/3 HP at 120 VAC, 1/2 HP at 230 VAC
    • 360 W tungsten at 120 VAC
    • Fuses: 12 A, 250 VAC ABC-type ceramic
  • Alarm Relay:
    • 0.4 A at 125 VAC; 2 A at 30 VDC, resistive load
    • 0.2 A at 125 VAC; 1 A at 30 VDC, inductive load

Common Applications:

  • Livestock Applications include buildings housing calves, rabbits, goats, hogs, poultry, and turkey. In these applications, the SEC-HD often controls ventilation in a single 20' x 40' or smaller room. It is not restricted to small rooms; some customers use it to control ventilation in sow breeding rooms that ar 200' long
  • Greenhouse Applications include controlling variable and single-speed fans and heaters. Some operations use the proportional feature for misting or ground heat (water pipes)
  • Business/Light Industrial Applications include machine shops, garages, and utility sheds where customers use the SEC-HD to control fans and inlets. It exhausts heat from the room made by equipment and/or regulates the temperature as service bays open and close
Brand Phason
Manufacturer Part Number SEC-HD-EASY
Animal Cattle, Swine, Poultry & Gamebird





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