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12-Volt Phason Natural Ventilation Control

MF #NVC-2-12
QC Part #
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DC powered Natural Ventilation Control.

This 12-Volt DC powered Phason Natural Ventilation Control (NVC-2-12) automatically controls the temperature in a room by operating a curtain machine and heater or furnace according to your programmed settings.

Controlling a Curtain Machine:

  • When the temperature is within the idle band, the NVC-2-12 maintains the curtain position
  • When the temperature rises above the idle band, the NVC-2-12 opens the curtain for the on duration and then pauses for the off duration
  • After each off duration, the NVC-2-12 checks the temperature and then either opens or closes the curtain, depending on the temperature

Controlling a Heater or Furnace:

  • When the temperature is below the heat set point, the NVC-2-12 switches the heater on; when it is above the set point, the NVC-2-12 switches the heater off


  • Automatic temperature-based control, with extended range
    • -13 to 125°F (-25 to 51.7°C)
  • Programmable On and Off durations for the open and close relays
    • 1-900 seconds (up to 15 minutes)
  • Programmable Idle band
    • 1.0 to 10.0°F (0.6 to 5.5°C)
  • Programmable heater Hysteresis
    • 0.3 to 5.0°F (0.2 to 2.8°C)
  • Programmable High hand Low temperature alarms
  • Two curtain relays (one open, one close)
  • Heater control relay
  • Alarm relay (for external alarm system)
  • Four-button keypad
  • Four-digit LED display
  • Programming and status LEDs
  • Manual override and test modes
  • Power-failure settings protection
  • Six-foot temperature probe, extendable to 500 feet
  • Optional Rain Sensor
  • Rugged enclosure (corrosion resistant, water resistant, and fire retardant)
  • cCSAus approval

Electrical Ratings:

  • Input
    • 85 to 264 VAC, 50/60 Hz
  • Open/Close/Heat Relays
    • 15 A at 120/230 VAC, resistive load
    • 1/2 HP at 120 VAC, 1 HP at 230 VAC
  • Alarm Relay
    • 0.4 A at 125 VAC, 2.0 A at 30 VDC, resistive load
    • 0.2 A at 125 VAC, 1.0 A at 30 VDC, inductive load
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