Motor itself but also the condenser fan motor as well as the compressor motor base heater if a heater element is installed and operating. Remember that the total system FLA number includes the current draw of not only the compressor The current draw in AMPS is compared with the unit's specified FLA or "full load amps"įound on the data tag or in the service manual for the unit. It is important to measure the amp draw of the compressor only when you are trying to determine if it is operating properly. To use the chart, the technician must know the evaporating temperature, condensing temperature, and voltage applied to the compressor. The compressor chart will list the correct amp draw for the compressor under its various operating conditions. Watch out: the nameplate data giving FLA/RLA or LRA for an air conditioning system may include multiple electrical components combined, and even if it pertains to just the compressor motor, according to some industry experts these figures may not be an accurate diagnostic number for checking on hermetically-sealed A/C or heat pump compressor motors. Stabilize at its normal operating temperatures and pressures (typically 10 to 20 minutes), the service technician may measure the compressor's current draw in Amps using anĪmmeter or amp meter or multi-tester and appropriate connections. How We Measure Amps or Current Draw at the Air Conditioner Compressorīasic air conditioning compressor operation check: after the air conditioning system compressor/condenser unit has been running long enough to Amp Draw Testing for A/C or Heat Pump Compressor MotorsĪlso see Basic Electrical Tests on Air Conditioner or Heat Pump Compressor Motors foundĪt BURNED-OUT COMPRESSOR. On its long future life before it needs to be replaced. If these steps do not get the tight or seized compressor running, it needs to be replaced.īut even if these steps do work, the compressor has probably been damaged and you should not count If these steps work the compressor may continue to be used. The service technician may try re-starting a hard-starting or tight air conditioning compressor by trying to move the motor backwards and forwards.īe freed up enough to start at all and the oil level is made correct, the technician may install a "hard start kit"Īlso see CAPACITORS for HARD STARTING MOTORS for photos, wiring diagram, and installation instructions for air conditioner compressor, fan, blower, refrigerator motor, freezer motor, or other electrical motor starting booster capacitors. Re-Starting a Tight or Seized Air Conditioner Compressor Startup, so that measurement may be used as part of the diagnosis of this problem. The A/C compressor may refuse to start at all, or may be hard-starting depending on when it last ran and what it's temperature is.Ī "hard starting" "tight" air conditioner compressor will probably draw excessive current (Amps) during Or perhaps if the compressor is old and has not been run in some time. Loose and worn - loose or worn air conditioner compressor diagnosis is described separatelyĪ tight or seized air conditioner compressor might occur, for example, if the compressor ran while low on oil. Sometimes a compressor may be internally damaged or worn in a way that makes the piston(s) run tight in the cylinder(s) rather than Diagnosing Tight or Seized Air Conditioning Compressors We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Here we continue with details about examining and measuring A/C and heat pump compressors to continue compressor condition diagnosis. See the basic diagnostic steps suggested BURNED-OUT COMPRESSOR for A/C and heat pump damage indications and causes. Advice for measuring amps or current draw to check for a seized or tight or failing A/C or heat pump compressor motor. This air conditioning repair article discusses theĭiagnosing Tight or Seized Air Conditioning Compressors and how to re-start a tight air conditioning compressor. Seized air conditioner or heat pump compressor motor diagnosis: We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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