Natural Ventilation Control (NVC)

Simple, effective curtain machine or actuator control

The Natural Ventilation Control (NVC) automatically controls the temperature in a room by positioning an inlet or curtain.

When the temperature is at the temperature set point, the NVC maintains the curtain position. When the temperature rises above the set point, the NVC opens the curtain for the 'open duration' and then pauses for the 'idle duration'.

After each idle duration, the NVC checks the temperature and then either opens the curtain or closes the curtain (for the preset duration) depending on the temperature.

The NVC is ideal for greenhouses and curtain-sided livestock buildings.

Features

Two relay stage outputs (open/close)
Adjustable temperature set-point and differential
Adjustable high/low temperature alert settings
Adjustable open/close and idle durations (1 to 900 seconds)
Manual override to open/close curtains
Lock mode to prevent setting changes
Four-digit LED display and status LEDs
Fahrenheit and Celsius display
Error code display for troubleshooting
Overload protection fuse
Alarm relay
30-foot temperature probe, extendable to 500 feet
Rugged enclosure (corrosion resistant, water resistant, and fire retardant)
CSA approval
Two-year limited warranty

Electrical ratings

Input:
Open/close relays:

Fuses:
Alarm relay:

120/230 VAC, 50/60 Hz
6 A at 120/230 VAC, general-purpose (resistive)
1/3 HP at 120 VAC, 1/2 HP at 230 VAC
12 A, 250 VAC ABC-type ceramic
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

Additional information

NVC user manual (PDF - 241K)
NVC feature sheet (PDF - 122K)
Ventilation control overview (PDF - 35K)

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