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 selected airflow rate and pressure drop shall be established prior to recording the first determination. For all types of tests, three readings of ambient drybulb temperature tdoambient wet-bulb temperature twoand ambient barometric pressure pb shall be recorded unless the readings are steady in which case only one need be recorded.
Any consistent system of units may be employed to evaluate these quantities unless a numerical factor is included, in which case units must be ajca specified. Standard air is air with a density of 1. Thus, if the air is at rest, the total pressure will equal the static pressure.
Open a smaller nozzle combination such that the pressure differential across the leakage chamber nozzle plate is higher than the first determination. Ps5 may not be used to calculate the damper pressure differential. Curtain type dampers of less than 30 percent duct area blockage may be tested with 4D minimum upstream of Plane 9 and 6D minimum downstream of Plane 2 provided there is 15 percent maximum blockage at any wall.
The arithmetic mean of the individual velocity measurements made at these points will be the mean velocity through the measuring section for the subject velocity profiles . If the value is above 2 cfm, the leakage test shall be repeated. The instruments and apparatus used in the test shall be listed.
A supply fan shall not surge or pulsate during a test. It is determined by multiplying the sum of the minimum distances between intermediate blades, top blade and head 500r bottom blade and sill, by the minimum distance between jambs. Mount damper as shown in Figure 5. A stable airflow rate through the damper shall be established before commencement of the closing cycle. The standard nozzle is considered a primary instrument and need not be calibrated if maintained in the specified condition.
Once the damper is opened an external visual inspection through viewing ports, if necessary of the damper shall be made and recorded. The plenum height shall be no less than the plenum length.
This test shall be referred to as the damper and system test. Equipment other than the examples cited may be used provided the accuracy requirements are met or exceeded.
A test is a complete set of measurements or determinationsone set for each setting of xmca with the damper in the open position and pressure drop across the damper when in the closed position. Aca with inlet chamber Figure 5. 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 amcx damper when in the closed position.
Failure to open 500r previously demonstrated in the static condition shall be recorded.
A statement of the measured airflow leakage rate per face area of damper at the test temperature and test pressure shall be reported. Torque readings at 1? Where torque must be applied to a blade or shaft to drive the damper to its closed position, seating torque shall be applied as described in Section 8. Adjust the fan speed to obtain the desired pressure differential across the closed damper. The airflow face velocity is the velocity established with the damper 50d the open position.
The report 050d presentation of results shall include all the data as outlined in Section 8. Names, model numbers, serial numbers, scale ranges, and calibration information should be recorded.
One reading per determination of chamber static pressure Ps7 shall be recorded. A test shall be conducted with calibrated weights, maca, actuators or other dampers that may be used to apply the normal seating torque. For all tests, three readings of ambient dry-bulb temperature tdoambient wet-bulb temperature twoambient barometric pressure pb shall be recorded unless the readings are steady in which case only one need be recorded.
AMCA seeking volunteers to serve on AMCA D Review Committee.
The results of an air leakage test shall be presented as a statement of the pressure differential across maca damper [Pa in. One reading per determination of plenum static pressure Ps8 and plenum temperature td8 shall be recorded. When discontinuities exist they shall be identified with a broken line.
Objective, Observations and Conduct of Test. If desired, the blade angle may be measured degrees from closed at each amva point.
The results for each determination shall be shown on the performance curve as a series of circled points, one for each variable plotted as ordinate. The dry-bulb thermometer shall be mounted upstream of the wet-bulb thermometer so its reading will not be depressed. Where a measuring plane is located downstream of the settling means, the settling means is provided to insure a substantially uniform flow ahead of the measuring plane.
Your 500r Profile lists the documents that will be monitored. Inlet chambers shall have a cross-sectional area at least three times the free area of the damper being tested.
The corresponding weight shall be lowered gradually, without impact loading, until the damper reaches its closed position and without additional applied force. After the test 500 has been set to establish the desired airflow rate through the open amxa and pressure drop across the closed damper, the test damper will be opened and the system set to deliver the airflow rate established at ambient conditions.
The temperature which exists by virtue of the internal energy of the air only. Data shall be recorded to establish accurate airflow measurement see Section 6.
Since it is not practical to set up and test the exact airflow rate, corrected to standard air, for each pair of determinations the subtraction may be accomplished by one of the methods below. The Reynolds number Re based on nozzle exit diameter D6 shall be calculated from: The gas constant R may be taken as During opening, the pressure drop across the damper shall not be less than the value indicated by a straight line between a,ca pressure drop at the full-open position and the pressure drop across the damper at the full-closed position when time abscissa vs.
Closure velocity shall be based on the total area of the multiple damper sections and not the single section velocity. With the pressure differential maintained on the closed damper, a visual inspection shall be made on the damper and the degree of closure shall be recorded.
An airflow rate measurement and pressure differential shall be established and recorded at ambient temperatures between 500e