Showing results 1 - 50 of 82
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These schematics illustrate temporary deployment locations for probes during the commissioning process; these probes connect to smartphone commissioning applications.
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A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
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A flow grid is inserted into the filter grille/slot to directly measure airflow.
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A nitrogen pressure test was completed on this ductless mini-split heat pump using a digital manifold gauge.
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A static pressure measurement is taken on this air handler using probes on the supply and return sides of the fan.
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A vacuum decay test is performed on this ductless mini-split heat pump using a digital micron gauge for accurate measurement; a deep vacuum is achieved quickly by using large diameter, vacuum-rated hoses, and removing valve cores
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
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Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
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Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
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Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
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Duct to boot connection of jump duct not fastened and sealed
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Ducts sagging because supports not installed at regular intervals
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Example of an HVAC installer’s balancing report form
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Fan housing was oriented in the correct direction to allow proper exhaust duct installation
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Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter
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Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
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HVAC ducts, cavities used as ducts, and combustion inlets and outlets may pass perpendicularly through exterior walls but shall not be run within exterior walls unless at least R-6 continuous insulation is provided on exterior side of the cavity
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If filter is inaccessible, locate the air filter between the return air plenum and the air handler box
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If furnace is accessible, locate the air filter between the return air plenum and the air handler box
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If HVAC duct must be installed in an exterior wall, separate it from the exterior with at least R-6 of continuous rigid insulation
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If the furnace is hard to access, locate filters at return registers covered by hinged grilles that are easy to open from inside the home
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Inadequate amount of insulation installed with compression, misalignment, and voids
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