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6.3
Duct connection – airside connection to AHU
Depending on the customer's requirements, TRANE devices are equipped with various accessories
and options for attaching air duct elements like dampers, flexible connections, frames, panel
flanges, etc.
If no such accessories are supplied, then the airside mounting of components of the duct system is
made directly to the housing of the AHU. Depending on the device opening, this can be done di-
rectly on the panel flange or directly on the external panel of the device.
When connecting, make sure that the requirements listed below are followed:
Requirements
Ensure proper performance of the AHU by avoiding excessive pressure drops in the duct. To
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minimize the noise, the basic principles of the duct construction and acoustic design shall be ob-
served.
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A suitable seal (not included in the scope of supply) has to be installed between the device
housing and the component of the duct system.
The aero-technical connections must be executed tension and torsion free. For example no
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forces / loads are allowed to be transmitted to the device housing by means of attached acces-
sories such as ducts etc. The components on the system side must be fastened and supported
separately.
Even if no flexible connection is included in the scope of delivery of the device, an elastic con-
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nection must always be installed to prevent structure-borne sound transmission between the de-
vice and the duct system. It is recommended to use an interposed elastic connection of at least
140 mm in width, which shall be installed unstrained between the duct and the AHU.
This elastic connection must have sufficient flexibility and must be installed in a professional
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manner in order to avoid transmission of vibrations to the duct system.
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For a proper performance of the AHUs, the observance of the basic rules of the duct construc-
tion is necessary. By appropriate planning, dimensioning and execution of the duct system, in-
creased pressure losses and flow noise in the duct can be avoided.
Number of screws
40/115
Figure 66: Pressure side installation: remove the black closing plug
V07-19.0
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