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Phason Natural Ventilation Control (NVC-2)

QC Part #
In stock
Effective curtain machine and heater control.

Phason's Natural Ventilation Control (NVC-2) 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 maintains the curtain position
  • When the temperature rises above the idle band, the NVC-2 opens the curtain for the on duration and then pauses for the off duration
  • After each off duration, the NVC-2 checks the temperature and then either opens or closes the curtain, depending on the temperature

Controlling a Heater:

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


  • Automatic temperature-based control, -13° F to 125° F
  • Programmable On and Off durations for the open and close relays
    • 1-900 seconds
  • Programmable idle band
    • 1.0° F to 10.0°F
  • Programmable heater hysteresis
    • 0.3° F to 5.0°F
  • Programmable temperature alarms
  • 2 curtain relays (1 open, 1 close)
  • Heater control relay
  • Alarm relay (for external alarm system)
  • 4-button keypad
  • 4-character LED display
  • Programming and status LEDs
  • Manual override/test mode
  • Power-failure settings protection
  • 6' temperature probe, extendable to 500'
  • Optional Rain Sensor
  • Rugged enclosure (corrosion resistant, water resistant, and fire retardant)
  • cCSAus approval
  • 2 year limited manufacturer warranty

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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