Variable Air Volume Terminal Unit

The performance of the VAV terminals and their controls is critical to the performance of the overall VAV system. Barcol-Air is known for their leadership to create an indoor climate which offers an optimum system in terms of comfort, pressure, IAQ and energy efficiency.

In order to vary the amount of Pressure, IAQ, Cooling or Heating provided to a room:

P = K.Q.ΔT Q
Supply Airflow		 ΔT
Room minus Supply Air Temperature
Constant Air Volume System (CAV) Constant Variable
Variable Air Volume System (VAV) Variable Constant
  • Reducing the airflow when not needed SAVES FAN ENERGY
  • Fan Power is proportional to [Airflow] ³
  • VAV Systems save 30% to 70% of fan Motor Energy
Variable Air Volume Terminal Unit
Variable Air Volume System

Barcol-Air VAV terminals incorporate the following features:

  • Pressure independent with Flo-Cross airflow sensor.
  • Barcol-Air patented design has 2 x 12 sensing points with signal averaging and amplification with proven accuracy of 2.5% in operational range for accurate measurement & control of air volumes.
  • Volume control range 100% to 10%.
  • Single or Double skin construction with 25 mm Insulation to reduce heat transfer & radiated noise.
  • Special Materials and Finishes i.e. Galvanized Sheet Steel, Painted & Stainless Steel.
  • Factory installed & calibrated digital actuator and controller with maximum and minimum airflows for plug and play operation.
  • Low pressure loss over the terminal.
  • BACnet MS/TP integration.
  • Suitable for all control function (VAV, CAV or shutoff operation) to maximise the system energy savings.
  • The air terminals can be delivered optional with an air distribution plenum and accessory hot water or electric reheat coil.
  • Nominal power supply requirements: 24 VAC, 50/60 Hz or 24 VDC. Optional transformer available for converting 230 VAC to 24 VAC for power supply.
  • Maintenance free.

Variable Air Volume (VAV) Terminal Configurations

Round Connection VAV Units NA (Single wall)NB Series (Double wall) Series

Round Connection VAV Units NA (Single wall) / NB Series (Double wall) Series

  • Round Inlet / Outlet connection.
  • Volume Capacity : 50 to 4,500 m3/h.
  • Size : ∮100, 125, 160, 200, 250, 315, 355, 400 mm.
  • Casing Leakage Class C according to Standard EN 1751.
  • Damper blade made of Galvanized Steel sandwich construction with twin blads and a neoprene gasket with low leakage.
  • Closed blade damper air leakage Class 4 according to Standard EN 1751 except diameters 100 and 125 are Class 3.
  • Sleeve connection with rubber gasket.
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Compact VAV Units NC (Single wall) Series

  • Round Inlet / Rectangular Outlet connection.
  • Volume Capacity : 50 to 4,500 m3/h.
  • Size : ∮100, 125, 160, 200, 250, 315, 355, 400 mm.
  • Oval shape damper blade for linear control characteristics,
  • Casing Leakage Class C according to Standard EN 1751.
  • Closed blade damper air leakage Class 4 according to Standard EN 1751 except diameters 100 and 125 are Class 3.
  • Sleeve connection with rubber gasket for Inlet and 30 mm duct flange connection for outlet.
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Compact VAV Units NC (Single wall) Series
Rectangular and Large Air Volume VAV units – NK (Single wall) NL (Double wall) Series

Rectangular and Large Air Volume VAV units – NK (Single wall) / NL (Double wall) Series

  • Rectangular Inlet / Outlet connection.
  • Volume Capacity– 750 to 14,500 m3/h.
  • Size- W x H: 200 x 150 to 1000 x 600 mm.
  • Damper blade: aluminium, aerofoil 100mm wide opposed blade construction with gear linkage.
  • Closed blade air leakage is class 1 according to standard EN1751.
  • NKS low leakage version is class 4 according to standard EN1751 except model sizes 100mm and 200mm height which are class 3.
  • 30 mm duct flange connection.
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Induction VAV System – NV (Single wall) Series

The Induction VAV system works on a similar principle to the standard VAV system varying the quantity of primary cooled air to the room in response to the cooling requirements. However the Induction VAV system takes the energy saving capability and comfort levels of the system to a higher level.

These benefits are achieved through the use of special induction VAV terminals that induce room air into the terminal to mix with the primary air before the total air is delivered to the air conditioned space to overcome poor air distribution at low primary air flows. This allows the system to operate with lower primary air temperatures. This help in reducing maximum airflows requirement, AHU and ducting sizes.

Induction VAV System – NV (Single wall) Series
  • Round Inlet / Outlet connection.
  • Volume Capacity : 50 to 4,500 m3/h.
  • Size : ∮100, 125, 160, 200, 250, 315, 355, 400 mm.
  • Oval shape damper blade for linear control characteristics.
  • Casing Leakage Class C according to Standard EN 1751.
  • Closed blade damper air leakage Class 4 according to Standard EN 1751 except diameters 100 and 125 are Class 3.
  • Sleeve connection with rubber gasket.
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Induction VAV System – NV (Single wall) Series-1
Room Pressure Control Series with Standard or High Speed Actuator and Room Pressure Controller (RPC-C1)

Variable Air Volume (VAV) Technical Data Sheet

Room Pressure Control Series with Standard or High Speed Actuator and Room Pressure Controller (RPC-C1)

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Variable Air Volume (VAV) Technical Data Sheet

Room Pressure Control Series with Standard or High Speed Actuator and Room Pressure Controller and Air Flow Measurement (RPC-C1-AF)

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Room Pressure Control Series with Standard or High Speed Actuator and Room Pressure Controller and Air Flow Measurement (RPC-C1-AF)
Room Pressure Control Series with High-Speed Actuator and Intelligent Controller for Supply and Exhaust Airflow Measurement and Controller (RPC-C2)

Room Pressure Control Series with High-Speed Actuator and Intelligent Controller for Supply and Exhaust Airflow Measurement and Controller
(RPC-C2)

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Room Temperature Control VAV Series with integral Actuator/Controller and Remote Temperature Controller
(RTC-ZE)

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Controller and Remote Temperature Controller (RTC-ZE)
Controllerand Remote Wall or Duct mounted CO  Sensor (CO2-ZE)

Demand Ventilation Control VAV Series with integral Actuator/Controller and Remote Wall or Duct mounted CO  Sensor
(CO2-ZE)

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Laboratory Fume Hood Control (FHC-C3)

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Laboratory Fume Hood Control (FHC-C3)

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