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Phason Modulating Temperature (MTC-4C) Control

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This controller automatically modulates the fan according to temperature change.

The MTC-4C is Ideal for Hog, Poultry, Dairy, Greenhouse, or Light Industrial Buildings.

Phason's MTC-4C Modulating Temperature Control allows you to automatically control ventilation fans according to ambient temperature.

When the temperature is at the temperature set point, the MTC-4C operates the fans at the idle speed setting. When the temperature exceeds the set point, it increases the speed. When the temperature increases 6° F above the set point, the MTC-4C increases the speed to maximum.

When the temperature drops below the set point, it shuts off the fans (in shut-off mode) or operates the fans at idle speed (idle mode).


  • 1 variable speed output
  • Adjustable 40° F to 90° F temperature set point
  • 6° F temperature differential
  • Automatic shut-off and idle modes
  • 2° F off set-back for shut-off mode
  • Adjustable idle speed for idle mode
  • Overload protection fuse
  • 1' temperature probe, extendable to 500'
  • Rugged enclosure (corrosion-resistant, water-resistant, and fire retardant)
  • CSA approval
  • 2 year limited manufacturer warranty
  • Weight: 2 lbs

Electrical Ratings:

  • Input: 120/230 VAC, 60 Hz
  • Variable Stage:
    • 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
  • Fuse: 15 A, 250 VAC ABC-type ceramic
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