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Phason TVS Three Ventilation Stage Control

QC Part #
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An easy-to-use 3-stage automatic control.

The Phason Three Ventilation Stage Control (TVS) automatically controls the temperature in a room by operating two variable speed fans and a single-speed fan or heater.

The control comes with seven factory-configured operating programs you can easily adjust for your situation. The easy-to-use keypad and menu system make the TVS one of the easiest controls to program.

The TVS has a 30' temperature probe the monitors temperatures from -49° F to 122° F in a single zone. For more versatility, you can connect four temperature probes together and use four-zone averaging.

The TVS displays alert conditions such as high and low temperatures, power failure, and low line voltage, and can connect to an alarm system, alarm panel, or auto-dialer. Customizable alarm settings allow you to choose which alarm conditions you want to be notified about.


  • Automatic temperature-based control, range -13° F to 120° F
  • 7 configurable operating programs
  • 2 variable cooling stages for controlling fans
  • 1 general-purpose relay (heat or cool)
  • 1 alarm relay (for external alarm system or siren)
  • 4-character LED display and individual stage LEDs
  • Minimum and maximum temperature logging
  • Error code display
  • Manual override/test mode
  • Selectable motor curves
  • Ventilation disable option
  • 3-second full-power-turn-on for minimizing ice-up
  • Power-failure settings protection
  • 30' temperature probe, extendable to 500'
  • Easy System compatible; edit and store configuration and settings on a computer
  • Rugged enclosure (corrosion-resistant, water-resistant, and fire retardant)
  • CSA approval
  • 2 year limited manufacturer warranty
  • Weight: 6 lbs

Electrical Ratings:

  • Incoming Power: 120/230 VAC, 50/60 Hz
  • Variable Stages:
    • 7.5 A at 120/230 VAC, general-purpose (resistive)
    • 5 FLA at 120/230 VAC, PSC motor
    • 1/3 HP at 120 VAC, 1/2 HP at 230 VAC, PSC motor
    • Fuses: 12 A, 250 VAC ABC-type ceramic
  • Relay Stage:
    • 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
    • Fuse: 12 A, 250 VAC ABC-type ceramic
  • Alarm Relay:
    • 0.4 A at 120 VAC, 2.0 A at 30 VDC, resistive load
    • 0.2 A at 125 VAC, 1.0 A at 30 VDC, inductive load

Common Applications:

  • Livestock Applications include buildings housing calves, rabbits, goats, hogs, poultry, and turkey. In these applications, the TVS often controls ventilation in a single 20' x 40' or smaller room.
  • Greenhouse Applications include controlling variable and single-speed fans and heaters
  • Business/Light Industrial Applications include machine shops, garages, and utility sheds where customers use the TVS 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
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