Model Number: NVAV-CAV Brand: Provent

• Constructed from galvanized steel sheet G90, with a thickness of (gauge 22).
• Used in variable speed fan HVAC systems.
• Fiber Glass with a thickness of (25 mm) and a density of (24 Kg/m³) for noise absorption.
• Perforated sheet to cover the fiberglass and to reduce the airflow turbulence, with a thickness of (0.8 mm), (5 mm) perforation diameter and a (3mm) pitch.
• Heater can be added to the VAV unit upon request.
• Calibration is done in factory to the VAV upon the required constant flow.
• Siemens GDB181.1E actuator is used to modulate the blade position to control the airflow.
• Siemens RDG400 room thermostat is used to measure room temperature and to provide the control circuit with the desired temperature and the actual temperature.

Components

1. Round or oval Inlet.
2. Volume control Blade.
3. Galvanized steel casing.
4. Fiber glass.
5. Perforated Sheet.
6. Differential pressure sensor

Components and Diagram Components:

• Round, rectangular or oval Inlet.
• Rectangular outlet.
• By pass outlet.
• Volume control Blade.
• By pass blade.
• Galvanized steel casing.
• Fiber glass.
• forated Sheet.
• Control Box.

Control box components :

• Siemens actuator.
• Terminal block.
• Transformer.
• Wires inlet.
• Wires.

By Pass VAV Operation Principle : The main component of BP-VAV includes a the thermostat (Inside room) that measures the room temperature and sets the set point (desired room temperature by the end-user) and a controller that receives thermostat signals and convert the result of the required blade change position to the actuator that changes the blade position. If the system or the zoon requires more air (the heat exchange is high, more people entered the room or the thermostat has been set to less temperature) the actuator blades will open in a larger angle to allow more air to flow which in return it closes the by-pass blade with the same angle of the opening, if the system or the zoon requires less air (the room temperature reached the desired amount, people left the room or the thermostat has been set to higher temperature) the actuator will close the blade to reduce the amount of air entering the room which in return will cause the by-pass blade to open in the same angle allowing the air to pass through the return duct or to exhaust outside the whole system.