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 Bypass VAV Terminal Unit  A to Z Products
 Introduction
 
Bypass VAVs combine the advantages of proven air handling concepts to give complete zoning flexibility from a single zone source. The VAVs complement by providing excellent temperature control and central air distribution with unlimited zoning. The added advantage of multi-zone systems are by supplying centralized air distribution from unwanted zones to demand related zones.

 
  Systems Principle Of Operation
 
Cosmos Bypass Terminal Unit is a single duct pressure dependent air terminal unit, designed for use with popular constant volume low and medium pressure packaged air handling systems or roof top air conditioning units at low prime cost. Temperature control is achieved by supplying only enough conditioned air to the space to satisfy room thermostat demand. Excess air is diverted (bypassed) directly to the return air ceiling plenum for free or ducted return. Airflow to each occupied zone will vary on thermostat demand, from full flow to shut-off or to a set minimum air volume.

Bypass terminals can be added to a single-zone constant volume system to provide zoning without the energy penalty of a conventional reheat system, providing low first cost with minimum fan controls. The Combination of efficient pressure independent VAV & VFD driven AHU is more energy efficient compared to these system. Its most frequent application is on small systems.
 
  Standard Features
 
Casing 22 gauge galvanized sheet with round inlets. Outlets are square with four side flange. Damper well design for reliable long term operation. The internal linkage is smooth due to frictionless double nylon bushings.
12 x 12 mm plated steel drive shaft.
Internally lined casing utilizing opencell elestometric nitrile foam rubber, fiberfree, supersilent & microban resistant.
Size range from 150 mm to 400 mm with capacities from 400 CFM to 2800 CFM
Compact low profile design is ideally suited for installation in tight space
Electronics control factory supply & mounted.
Variety of control options available, based on applications.
Electronic thermostat & actuator provide accurate mounting control.
 
  Unique Damper Design
 
COSMOS Bypass terminal units utilize a unique damper for superior control and performance. A common problem with standard pivoted single blade damper designs is objectionable noise and loss of modulation due to pulsating and / or a snap-closing action of the valve. This is caused by a poor valve design, which struggle to modulate turbulent airflow arid require excessive torque.

The COSMOS damper eliminates these problems. The special damper design smoothly modulates between supply and bypass conditions essentially self - balancing, requirement.

The precisely design damper operates with minimum torque.
 
  Standard Control Sequences . Analog Electronic . Pressure Dependent
 
Sequence of Operation:
 
Central system supplies cool air. On a rise in room temperature above set point, the bypass damper will slowly modulate open, increasing the flow of air to the room, closing the bypass at the same time. On a fall in room temperature below set point, the bypass damper will modulate closed, reducing the flow of cool air into the room and opening the bypass at the same time. A mechanical air volume minimum stop is provided (field set).
 
  Cosmos Modulating Controls
 
  Hardware Specs   Power Consumption
      15 VA peak
       
  Enclosures   Ambient limit
  Confirms to NEMA1   Storage and operation -10 to 50 Deg C, Humidity-0 to 95 RH Non condensing
       
  Mounting   Actuator Specs
  Actuator - Direct mounting on VAV shaft/box Communicating Thermostat - On the wall in occupied area.   4 VA, 24 Vac/dc, 30 - 180 sec stroke Guaranteed for 60,000 operations minimum
       
  Power Supply    
  24 V ac for the controller 40 VA transformer 230 V to 24V    
 Features
 
19" rack mountable or table top version Front and rear screw less
Single depth extrusions with decorative grooves Optimised usable height for 1u and 2u subracks
Softline with minmum screws    
 
 Construction
 
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
 
 Compliance
 
IEC 297 and DIN41494
IEEE 1101.10 / 11
IEC 297 and DIN41494
IEEE 1101.10 / 11
 Products
 
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
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