GREENHECK DD Dual Duct VAV Terminals User Manual

GREENHECK DD Dual Duct VAV Terminals

Product Information

Specifications

• Model: DD, DH, DS
• Type: Dual Duct VAV Terminals
• Document Number: 1041404

Product Usage Instructions

Installation

1. Only qualified personnel should install the unit.
2. Ensure personnel have a clear understanding of the instructions and general safety precautions.
3. Follow all local electrical and safety codes, as well as national codes where applicable.
4. Securely and adequately ground the unit.
5. Verify compatibility of power source with the equipment.

Operation

1. Read the installation, operating, and maintenance instructions thoroughly before using the equipment.
2. Always disconnect power before performing any work on or near the unit.
3. Use appropriate lockout tagout procedures to prevent accidental power up.

Maintenance

1. Regularly inspect the unit for any damage.
2. Report any shipping damage immediately to the delivering carrier.

Troubleshooting
If you encounter any issues with the Dual Duct VAV Terminals, refer to the troubleshooting section in the manual for guidance. If problems persist, contact a licensed professional for assistance.

FAQ

• Q: What should I do if I find shipping damage?
  A: If any shipping damage is found, report it immediately to the delivering carrier.

• Q: Can children operate this appliance?
  A: This appliance is not intended for use by children or persons with reduced capabilities unless supervised by someone responsible for their safety.

Installation,  Operation and Maintenance Manual Dual Duct VAV  Terminals

• Document 1041404 Model DD, DH, DS DUAL DUCT ATU
• Installation, Operation and Maintenance Manual
  Please read and save these instructions for future reference. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with these instructions will result in voiding of the product warranty and may result in personal injury and/or property damage.

General – Safety Information

Only qualified personnel should install this unit. Personnel should have a clear understanding of these instructions and should be aware of general safety precautions. Improper installation can result in electric shock, possible injury due to coming in contact with moving parts, as well as other potential hazards. If more information is needed, contact a licensed professional engineer before moving forward.

1. Follow all local electrical and safety codes, as well as the National Electrical Code (NEC), the National Fire Protection Association (NFPA), and the Canadian Electrical Code (CEC), where applicable.
2. Unit must be securely and adequately grounded.
3.  Verify that the power source is compatible with the equipment.
4. Electrical equipment should be transported, stored, installed, and operated only in the environment for which it is designed.

DANGER
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.
WARNING
Always disconnect power before working on or near a unit. Use appropriate lockout tagout procedures to prevent accidental power up.
NOTICE: This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with
the appliance.

Receiving Inspection and Hanging/Installation Requirements

• Prior to removing the shipping materials, visually inspect the packing materials. There should be a black plastic strip wrapped in the clear plastic stretch wrap. If this black plastic strip is missing, the shipment may have been repacked by the shipper and you should make a note of this on the shipping documents and inform the delivering carrier. If any damage or other concerns are present, make a note of this on the shipping documents and inform the delivering carrier.
• After unpacking the Dual Duct Air Terminals, check for shipping damage. If any shipping damage is found, report it immediately to the delivering carrier.
• Always store the product in a clean dry location prior to installation.
• Units with controls are not recommended for use in ambient temperatures greater than 95ºF. For protection of controls, do not store in temperatures above 135ºF.

General – Model Number Code

The model number code provides basic identification of the unit.

Installation

• CAUTION: HAZARD OF EQUIPMENT DAMAGE
• Do not use the flow sensor, connecting tubing or damper shaft as a lift point. Damage to the components may result.
• NOTICE : Unit is not recommended for installation above 2,000 m.
• The Dual Duct terminal should be supported directly with straps screwed into the side of the terminal. (See figure 1)
• Alternate trapeze hangers or the method prescribed for the rectangular duct on the job specification may be used. (See figure 2)

Figure 2 -Trapeze
Using Trapeze-Hangers

Dual Duct Air Terminals may also be suspended with factory-supplied and field- installed hanger brackets and field-supplied and installed hanger rods. (See figure 3)

• Dual Duct Terminal Units are not designed nor suitable for outdoor use.
• In advance of start-up, verify all electrical connections are tight and the correct voltage is supplied to the Dual Duct Terminal Unit per the rated voltage listed on the unit label. If factory-supplied controls are present, review all wiring diagrams to assure a complete working knowledge.
• IMPORTANT
• If equipped with pneumatic controls, the orientation of the Dual Duct Air Terminal unit is critical. The pneumatic controls must be mounted right side up. The Dual Duct Terminal must be level within + or – 10 degrees of horizontal, both parallel to the airflow and at right angle of airflow. The control side of the Dual Duct Terminal is labeled with an arrow indicating up. Unless otherwise noted, most electric, analog electronic and digital controls are not position sensitive and may be installed in any orientation.
• MINIMUM CLEARANCE FOR ACCESS
• Dual Duct Air Terminals require sufficient space to allow servicing of the controls and electric reheat power hookup (if applicable). Horizontal clearance requirements are dependent upon access panel dimensions which are indicated on the appropriate submittal. For control panel access, a minimum of 18” is recommended. See the appropriate submittal for control panel location.
• CAUTION
  These clearance recommendations are not meant to preclude NEC requirements or local building codes that may be applicable, which are the responsibility of the installing contractor.

CONNECTING DUCTWORK
NOTICE: Do not insert ductwork inside the inlet collar of the Dual Duct Air Terminal. Inlet duct should be installed in accordance with SMACNA guidelines.

1. Slip each inlet duct over the inlet collar of the Dual Duct Air Terminal.

2. Fasten and seal the connection by method prescribed by job specification.

3. The diameter of the inlet duct in inches must be equal to the listed size of the Dual Duct Air Terminal; e.g., a duct that actually measures 8 inches must be fitted to a size 8-inch Dual Duct Air
   Terminal. The inlet tube of the Dual Duct Air Terminal is manufactured 1/8” smaller than the listed size in order to fit inside the duct.

4. If an inlet airflow sensor is installed, it is recommended the installer provide a minimum of 3 duct diameters of straight duct at the Dual Duct Air Terminal inlet.

5. The outlet end of the Dual Duct Air Terminal is designed for use with slip and drive duct connections (flanged outlets optional).

6. A rectangular duct the size of the Air Terminal outlet should be attached. (Refer to submittal for correct size.)

FIELD ELECTRICAL WIRING

• DANGER
  High voltage electrical supply is needed for this equipment. The control cabinet contains live electrical parts. Contacting these parts with power applied may cause serious injury or even death. This work should only be performed by a qualified electrician.

• All field wiring must comply with local building codes and NEC. (ANSI/NFPA 70).

• When applicable, electrical control and piping diagrams are attached to the inside of the control enclosure cover of the Dual Duct Air Terminal.

• Use copper only conductors with insulation rated 75ºC.

• The Dual Duct Air Terminal must be properly grounded per NEC 424-14 and 250.

• Always check product label for voltage and current data to determine the proper wire size and over current protection.

• The control panel cover must be closed or in place before applying electric power to the Dual Duct Air Terminal.

• These recommendations are not meant to preclude NEC requirements or other applicable local building codes and are the sole responsibility of the installing contractor.

• NOTICE : If the unit is not ordered with an internal disconnecting device then a disconnection device that shall disconnect all phases must be provided by the customer and incorporated in the fixed wiring.

CONTROLS

• NOTICE : Dual Duct Air Terminals with digital controls, if factory programmed, incorporate specific communication addresses. Installing the Dual Duct Air Terminal in a different location than noted on the Dual Duct Air Terminal label and building plans may result in excessive start-up labor and is the sole responsibility of the contractor.
• For information on controls provided by other manufacturers and installed on the Air Terminals, contact the local branch or dealer.

INLET FLOW SENSOR

• Dual Duct Air Terminals are shipped with factory-installed (where applicable) pressure differential inlet flow sensors in the primary inlet. See figure 4 for calibration curve and K factors. Bypass Air
• Terminals offer an optional downstream flow sensor for field installation a minimum of 3 feet downstream of box discharge.

Troubleshooting

Investigating Noise Complaints

• Noise from a Dual Duct Air Terminal can be due to a variety of conditions and can be difficult to eliminate.
• The first step is to isolate the type, source and direction.
• Generally, noise heard at the air outlet is considered a discharge type.
• Noise heard through the ceiling is considered radiated noise.
• For detailed information concerning noise transmission in buildings, refer to AHRI Standard 885- 2008, “Procedure for estimating occupied space sound levels in the application of air terminals and air outlets.”

Discharge Noise

• This is usually caused by high static pressure or little to no internal duct lining downstream of the Air Terminal.
• It can sometimes be caused by the air outlet itself.
• Air outlet generated sounds can be reduced by reducing flow or increasing an outlet size.
• Reducing static pressure, flow or adding additional downstream attenuation materials will reduce discharge sounds from the Air Terminal.

Radiated Noise

• Radiated noise is most commonly associated with Fan Powered Terminals.

Figure 4 – Multi-Quadrant Averaging Flow Sensor

• XG-TH, XG-FCI, XG-FCQ
• XG-FVI, XG-DD XG-DH, XG-BP XG-RT, XG-RA XG-TL (4 to 10)
• XG-FCl C2 (4 to 8)
• XG-FVL C2 (4 to 8)

| 04 Rnd| 300
05 Rnd| 375
06 Rnd| 540
07 Rnd| 760
08 Rnd| 990
09 Rnd| 1250
10 Rnd| 1640
12 Rnd| 2350
14 Rnd| 3250
16 Rnd| 4100
XG-TL (12)| 12 Flat Oval| 2270
XG- TL (14) & XG-FVL C6| 14 Flat Oval| 2850
XG- TL (16)| 16 Flat Oval| 3550
XG-FVL C4| 14×8 Rect| 2450
XG-FCl C4| 16×8 Rect| 2770
XG-FCI, XG-FCQ, & XG-FVI C7| 18×16 Rect| 6200
XG-TH 20| 20×16 Rect| 6430
XG-TH 24| 24×16 Rect| 7270

Note: K-factor is the calibration flow constant at 1 in. wg delta P

Our Commitment

• As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.
• Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature section of the website at Greenheck.com/Resources/Library/Literature.
• Phone: 715.359.6171
• Fax: 715.355.2399
• Parts: 800.355.5354
• E-mail: gfcinfo@greenheck.com
• Website: www.greenheck.com
• Dual Duct VAV Terminals
• Rev. 2, February 2024
• Copyright 2024 © Greenheck Fan Corporation

References

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