VAV B 20/30 Series
Dual Duct Type
Type: Rectangular / Round
Construction: Galvanized Steel (GI) / Stainless Steel
Application: Light & Medium Duty
Dual Duct Terminals
Dual duct terminal units are used in a special type of air distribution system where the main system has both warm air and cold air separatly ducted to each termial unit. the flow of both warm air and cool air is modulated, delivering air to the VAV zone at variable air volumes as well as variable temperatures.
A dual duct with integral mixing is similar to the non-mixing type, but has an integral mixing section between the two supply valves and the discharge duct connection. The standard mixing dual duct should provide, at a downstream distance of three equivalent diameters from the dual duct, a uniform discharge air temperature profile (±1 °F).
Data
Technical Features:
- Volume control range from 100 to 10% is possible to the
conditioned zone. - Accurate airflow sensing with 2 X 12 points averaging.
Low Leakage i.e. less than 2% of V nominal at 750 Pa. - Designed to produce low NC levels with minimal
pressure drop to the system. - Suitable for use as constant volume application,it can
maintain a set flow requirement, compensating for
fluctuations in system pressure. - Suitable for single duct variable volume control
- Air volume capacity upto 2800 CFM
- Electronics control factory supply & mounted.
- Variety of control options available, based on
applications. - Electronic thermostat & actuator provide accurate
mounting control. - Metal encapsulated edges limit fiberglass insulation
erosion into the airstream. - Single-point power connection reduces installed cost.
- Maintenance free.
- Mixing dual ducts are used in both interior and exterior
zones in buildings such as hospitals, or buildings where
the use of auxiliary reheat such as hot water or electric
reheat is not desirable.
Standard Construction
Casing
0.9 mm thick galvanized sheet steel.
Insulation
13 mm thick 32 kg/m³ density Acoustic liner.
Blade
0.9 mm thick galvanized sheet steel.
Flow grid
Flow grid multi point with 12 inlet holes in four concentric
circles.
Axle Shaft
12 mm diameter damper shaft made of galvanized steel.
Bearing
12 mm diameter Brass bearings.
Gasket
Neoprene Gasket.
Controls :
Modulating / On-Off.
Optional Fittings
Controls
Backnet DDC with suitable thermostat.
Sound Attenuator
VAV with additional length insulated casing for sound
attenuation.
Insulation
25 mm thick 32 kg/m³ density Acoustic liner.
Blade
0.9 mm thick aluminium extruded aerofoil multiple blades.
Duct Heater
Slip-in type electric duct heater (230V AC 1 Phase or
400V AC 3 Phase)
Double skin
Insulated internal walls surface with Galvanized perforated
sheet used for low noise applications to minimise breakout
noise.
Neck connections
Round inlet with round outlet and square inlet with square
outlet.