AMCA 500D PDF
The AMCA laboratory has the capability to test fans, louvers, dampers, air curtains ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating . Buy AMCA D: LABORATORY METHODS OF TESTING DAMPERS FOR RATING from SAI Global. ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating The purpose of this standard is to establish uniform laboratory test methods for.
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The area A6 is measured at the plane of the throat taps or the nozzle exit for nozzles without throat taps. The volume flow rate Q5 at the entrance to a nozzle or amxa nozzles with chamber approach shall be calculated from: A test shall be conducted with calibrated weights, springs, actuators or other dampers that may be used to apply the normal seating torque.
The test temperature td1 shall be recorded Figure 5. During this test, a damper 50d0 with an external actuator used as the mechanism to close the damper 28 shall be tested with an enclosure around the actuator. A curve for each variable shall be obtained by drawing a continuous curve using the test points for reference. The expansion factor Y may be obtained from: A determination or a series of determinations for various points of operation of a damper.
The converted airflow rate Qc is determined by adjusting the test airflow rate Qt by the square root of the pressure ratio required to make the pressure differentials identical. The recommended approximation which meets these requirements is shown in Figure 7B by Cermak, J.
ANSI/AMCA D – Laboratory Methods of Testing Dampers for Rating
It may be negative or positive. A performance curve shall be drawn with airflow rate as abscissa. The damper airflow rate may be calculated from velocity pressure measurements Pv3 taken by Pitot traverse. An airflow rate less than 0.
The downstream elbows should be as far as possible from the damper being tested. The nozzle throat dimension L shall be either 0. One reading per maca of chamber static pressure Ps8 and chamber temperature td8 shall be recorded.
A stable airflow rate through the damper shall be established before commencement of the closing cycle. The installation types and the corresponding test damper setup figures are: If multiple section dampers are to be tested each single section must be tested for closure with all other sections closed. For the purpose of calculating density at plane 5 Figure 6. The instruments and apparatus used qmca the test shall be listed.
When using a chamber for airflow leakage testing, criteria anca velocity profile downstream of the nozzles, and area ratio criteria may be ignored. Sufficient details shall be listed to identify clearly the damper and setup.
The original airflow shall be reestablished and recorded. Nozzles shall conform to Figure 7. The dry-bulb thermometer shall be mounted upstream of the wet-bulb thermometer so its reading will not be depressed. A test is a complete set of measurements or determinations one set for each setting of airflow with the damper in the open position and pressure drop across the damper when in the closed position.
Increase the pressure upstream of the nozzles in a minimum of five 5 approximately equal increments, to a minimum of Pa 4 in.
Either or both of these pressure signals can then be transmitted to a manometer or other indicator. After the test system has been set to establish the desired airflow rate through the open damper and pressure differential across the closed damper, the test damper will be opened and the system set to deliver the airflow rate established at ambient conditions.
AMCA seeking volunteers to serve on AMCA 500-D Review Committee.
The vane thickness shall not exceed 0. When system leakage is less than 9. Six airflow measurement setups are diagramed in Figures 6.
Dynamic operation torque is the torque at varying angles of rotation of the axle which operates the damper from the full open, to the full closed, and back 500dd the full open position while exposed to specific airflow conditions. B Blank off exiting end of chamber location where tail end piece Figure 6.
Turning vanes may be used to improve the a,ca profile through an elbow. If the value is anca 2 cfm, the leakage test shall be repeated. The report and presentation of results shall include all the data as outlined in Sections 8. It is preferable that the same meters be used for the test as for the calibration.
One reading of chamber static pressure Ps8 and chamber temperature td8 shall be recorded per determination.
AMCA seeking volunteers to serve on AMCA D Review Committee.
Elevated temperature dynamic closure is the ability of a damper to properly travel from the full open to the full closed position while exposed to specific airflow conditions at a specified elevated air temperature. For each determination the pressure drop shall be the pressure with amcw damper in aamca damper and system at a given airflow minus the pressure at the identical airflow with the damper removed system. The corresponding weight shall be lowered gradually, without impact loading, until the damper reaches its closed position and without additional applied force.