GREENHECK XG-DD-500 Series XG-Dual Duct VAV Terminals Instruction Manual
- June 3, 2024
- GREENHECK
Table of Contents
GREENHECK XG-DD-500 Series XG-Dual Duct VAV Terminals Instruction Manual
Receiving Inspection
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. After unpacking the 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 95º F. For protection of controls, do not store in temperatures above 135ºF.
Caution: Do not use the flow sensor, connecting tubing or damper shaft as a lift point. Damage to the components may result.
Hanging/Installation Requirements
- The XG-Dual Duct Air 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)
- XG-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)
Note: XG-Dual Duct Air Terminals are not designed nor suitable for outdoor use. In advance of startup, verify all electrical connections are tight and that the correct voltage is supplied to the XG-Dual Duct Air Terminal per the voltage listed on the label. If factory supplied controls are present, review all wiring diagrams for complete working knowledge.
Figure 1 Hanging Straps
Figure 2 Trapeze
Figure 3 Optional Hanger Brackets and Hanger Rods
Important
If equipped with pneumatic controls, the orientation of the XG-Dual Duct Air
Terminal unit is critical. The pneumatic controls must be mounted right side
up. The XG-Dual Duct Air Terminal must be level within + or – 10 degrees of
horizontal, both parallel to the air flow and at right angle of air flow. The
control side of the XG-Dual Duct Air Terminal is labeled with an arrow
indicating up. Unless otherwise noted, most electric, analog electronic and
digital are not position sensitive and may be installed in any orientation
Minimum Clearance for Access
XG-Dual Duct Air Terminals require sufficient space to allow servicing of the
controls. 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.
Note: These clearances 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 Duct Work
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Slip each inlet duct over the inlet collar of the XG-Dual Duct Air Terminal.
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Fasten and seal the connection by method prescribed by job specification.
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The diameter of the inlet duct in inches, must be equal to the listed size of the XG-Dual Duct Air Terminal; e.g. a duct that actually measures 8 inches must be fitted to a size 8 inch Air Terminal. The inlet tube of the XG-Dual Duct Air Terminal is manufactured 1/8” smaller than the listed size in order to fit inside the duct.
Note: Do not insert duct work inside the inlet collar of the XG-Dual Duct Air Terminal. Inlet duct should be installed in accordance with SMACNA guidelines. -
If an inlet air flow sensor is installed, it is recommended the installer provide a minimum of 3 duct diameters of straight duct at the XG-Dual Duct Air Terminal inlet.
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The outlet end of the XG-Dual Duct Air Terminal is designed for use with flanged outlet connections. (Slip and drive outlet connection is optional.)
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A rectangular duct the size of the XG-Dual Duct Air Terminal outlet should be attached. (Refer to submittal for correct size.)
Field Electrical Wiring
- All field wiring must comply with local building codes and NEC. (ANSI/NFPA 70-2002)
- When Applicable, electrical control and piping diagrams are attached to bottom of XG-Dual Duct Air Terminal.
- Use copper only conductors.
- 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 cabinet contains live electrical parts.
- Contacting these parts with power applied may cause serious injury or even death.
- The control panel cover must be closed or in place before applying electric power to the XG-Dual Duct Air Terminal.
- These recommendations are not meant to precluded NEC requirements or applicable local building codes and are the sole responsibility of the installing contractor.
Controls
For information on controls provided by other manufactures and installed on
the Air Terminals, contact the local branch or dealer.
Important
Air Terminals with digital controls, if factory programmed, incorporate
specific communication addresses. Installing the Air Terminal in a different
location than noted on the Air Terminal label and building plans, may result
in excessive start up labor and is the sole responsibility of the contractor.
Inlet Flow Sensor
XG-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.
Labeling
XG-Dual Duct Air Terminals are shipped from the factory with multiple
information labels.
Control Sequence Label: Affixed to the terminal casing bottom. Displays piping/wiring diagram, control sequence number and any optional components.
Terminal I.D. Label: Affixed to bottom on cooling only Shows tagging, representative name, sales order number, applicable certifications, model number, Made in USA, any applicable electrical data and UL compliance markings.
AHRI Certification Label: Identifies applicable industry test standard and certifies XG-Dual Duct Air Terminal is in compliance.
Orientation Label: Identifies the proper air flow direction and top of XG-Dual Duct Air Terminal.
Troubleshooting
Investigating Noise Complaints
- Noise from an 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 or little to no internal duct lining downstream of the Air Terminal.
- It can sometimes be caused by 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.
MULTI QUADRANT AVERAGING FLOW SENSOR
