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typical benefits provided by single duct units, while performing at extremely low sound levels. This is critical in today’s buildings, where occupants are placing more emphasis on indoor acoustics.


SDL terminals offer the typical benefits provided by single-duct units, while performing at extremely low sound levels. This is critical in today’s buildings where occupants are placing more emphasis on indoor acoustics. In addition to quiet and accurate temperature control, the building owner will benefit from lower operating costs. The highly amplified, velocity-pressure signal from the FlowStar™ inlet sensor allows precise airflow control at low air velocities. 

For added flexibility, Model SDL terminals with electric heat are invertible. They may be installed with the control enclosure on the left or right, except when position sensitive control options are required (e.g. mercury contactors). 


Model SDL terminals are available in four unit sizes (10, 12, 14 and 16) to handle airflow capacities up to 4100 CFM.


Standard Features:
Construction

  • AHRI 880 certified and labeled
  • 20 gauge galvanized steel construction
  • 1/2" thick fiberglass insulation, mechanically fastened for added security
  • Unit is invertible and may be installed with controls on left or right

Primary Air Valve

  • 18 gauge galvanized steel construction
  • Low thermal conductance damper shaft
  • Position indicator on end of damper shaft
  • Mechanical stops for open and closed position
  • FlowStar center averaging airflow sensor
  • Balancing tees
  • Plenum rated sensor tubing

Hot Water Coils

  • Designed and manufactured by ENVIRO-TEC
  • AHRI 410 certified and labeled
  • 1, 2, 3 or 4 rows
  • Left or right hand connections
  • Tested at a minimum of 450 PSIG under water and rated at 300 PSIG working pressure at 200°F

Electrical

  • cETL listed for safety compliance with UL 1995
  • NEMA 1 wiring enclosure

Electric Heat

  • Unit is invertible and may be installed with controls on left or right, except with mercury contactor option
  • Designed and manufactured by ENVIRO-TEC
  • cETL listed as an assembly for safety compliance
  • Automatic reset primary and back-up secondary thermal limits
  • Airflow switch
  • Single point power connection
  • Hinged electrical enclosure door
  • Fusing per NEC

Electronic Controls

  • Patented FlowStar™ airflow sensor
  • ETL listing
  • NEMA 1 enclosure
  • 24-volt control transformer
  • Floating modulating actuator
  • Balancing tees and plenum-rated tubing

Standard Features:
Construction

  • AHRI Standard 880-certified and labeled
  • 22-gauge, galvanized-steel casing and valve
  • 1/2" thick, fiberglass insulation, mechanically fastened for added security

Hot-Water Coils

  • AHRI Standard 410-certified and labeled
  • 1, 2, 3, 4-row coils
  • Tested at a minimum of 350 psig under water
  • Mechanically expanded copper tubes leak tested to 350 psig air pressure
  • Male sweat-type water connections

Primary Air Valve

  • Embossed rigidity rings
  • Low-thermal-conductance damper shaft with position indicator
  • Mechanical stops for open and closed position
  • Multi-point, center-averaging, airflow sensor
  • Balancing tees
  • Plenum-rated sensor tubing

Electrical Components

  • cETL listed for safety compliance with UL 1996
  • National Electrical Manufacturers Association (NEMA) Type 1 wiring enclosure

Electric Heat

  • cETL listed as an assembly for safety compliance
  • Integral, electric-heat assembly
  • Automatic-reset primary and back-up secondary thermal limits
  • Single-point-power connection
  • Hinged, electrical-enclosure door
  • Fusing per NEC
  • Airflow switch
  • Ni-chrome elements
  • Wiring diagram

Optional Features:
Construction

  • 20-gauge, galvanized-steel construction
  • 3/4" or 1" fiberglass insulation
  • Scrim-reinforced, foil-faced insulation meeting American
  • Society for Testing and Materials (ASTM) C1136 for mold, mildew, and humidity resistance
  • 1/2" elastomeric, closed-cell-foam insulation
  • Double-wall construction with 22-gauge liner
  • Mounting brackets to accept all threaded hanging rods or wire hangers
  • Low-temperature construction for use in thermal-storage applications, including a thermally-isolated, primary-air inlet and a composite damper shaft

Hot-Water Coils

  • Low-pressure steam coils
  • Multi-circuit coils for reduced water-pressure drop
  • Opposite-hand water connections
  • Bottom and top access plates for cleaning

Electrical Components

  • Toggle-disconnect switch
  • Primary and secondary transformer fusing

Electric Heat

  • Proportional, solid-state relay (SSR) heater control
  • Mercury contactors
  • Disconnect (toggle or door-interlocking)
  • Pneumatic-electric (PE) switches
  • Manual-reset secondary limit

Controls

  • Factory-provided controls include:

               - Pneumatic controls
               - Analog electronic controls

  • Consignment DDC controls (factory-mount and wire controls provided by others)
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Enviro Tec SDR Single Duct VAV
Enviro Tec SDL Low Height VAV

Enviro-Tec Single Duct Terminals

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SDR VAV Terminals: Quiet performance with single-duct simplicity


VALUE AND SECURITY FOR THE OWNER​
Enviro-Tec SDR terminals offer the typical benefits provided by single-duct units, while performing at extremely low sound levels. This is critical in today’s buildings where occupants are placing more emphasis on indoor acoustics. 

SDL Single-Duct, Low-Height, VAV Terminals: Fit more comfort in less space


Model SDL terminals are only 10" in height, making
them ideal for shallow or congested ceiling plenum
applications. SDL terminals provide variable air volume (VAV) control beyond the typical single duct box. They are specifically designed for precise air delivery throughout the entire operating range. They also offer improved space comfort and flexibility for a wide variety of HVAC applications. SDL terminals take advantage of

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In addition to quiet and accurate temperature control, the building owner will benefit from lower operating costs. The highly amplified, velocity-pressure signal from the FlowStar™ inlet sensor allows precise airflow control at low air velocities. The FlowStar sensor’s airfoil shape provides minimal pressure drop across the terminal. This allows the central fan to run at a lower pressure and with less brake horsepower, while maintaining occupant comfort.

FLEXIBILITY FOR THE BUILDING DESIGNER​
Enviro-Tec SDR terminals provide variable-air-volume (VAV) control beyond the typical single-duct box. The compact cabinet design and quiet operation give the system designer the option to place units directly above occupied spaces. It is not necessary to locate the unit in the crowded space above a hall or corridor. This reduces lengthy and expensive discharge-duct runs. The SDR terminal provides the ultimate in airflow control with the patented FlowStar airflow sensor. No other sensor in the industry can match the FlowStar’s ability to quietly and precisely measure airflow. The FlowStar sensor ensures accurate control, even when space constraints do not permit long, straight, inlet duct runs to the terminal.

​CONVENIENCE FOR THE CONTRACTOR​
Physical installation is simple with low-profile, compact design and standard metal hanging straps. And control-installation time is minimized with the availability of factory-mounted and calibrated controls. Controls are located on the outside of the unit casing for easy access by maintenance personnel. A standard, single-point, main-power connection is provided with all electronic controls and electrical components located on the same side of the casing, for quick access, adjustment, and troubleshooting.

The FlowStar sensor ensures accurate airflow measurement, regardless of the field-installation conditions. A calibration label and wiring diagram is located on the terminal for quick reference during start-up. SDR terminals require no periodic maintenance and provide trouble-free operation.