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Passive Ventilation Controllers | PVC PVC Intelligent Natural Ventilation Controller

The PVC is a controller for natural ventilation systems. The PVC combines temperature control (cooling via natural ventilation and heating via underfloor heating/heating coils/radiators) and air quality based ventilation boost function with optional fan switching.

 
The dampers/louvres/windows can be overridden by the user to the required positions from the controller buttons (with a timeout). The controller has also built-in night purge functions to enable building fabric cooling during the cooler night temperatures.
Natural Ventilation Controller Override Buttons
The PVC controller has Modbus RTU RS485 interface that can be used for interrogating the controllers from the BMS systems. Via Modbus it is possible to enable system functions such closing the louvres at high wind speeds when it rains, or activating night time purge. Night time purge can also operate when the controller is stand-alone based on the outside air temperature sensor.
The controller has been designed also for stand-alone operation with digital input purge control and scheduling. The controller is easily integrated into system dampers and fans by using the WC-06 wiring center. (or in small applications using WC-01 wiring center).
APPLICATION EXAMPLES
BALANCED STACK APPLICATION.
In this application the room temperature is controlled with underfloor heating and balanced stack cooling/fresh air boost. Auxiliary stack fan control output is used when ventilation boost is required. Typically systems also have low level damper that follows the balanced stack damper positions.
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PASSIVE VENTILATION SCHEME
The passsive ventilation scheme is very similar to the balanced stack application but in this case the controller does not have stack fan control.
NATURAL VENTILATION SCHEME
In the natural ventilation scheme the cooling and supply of fresh air is carried out by the roof ventilation.
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