LIONBALL Motor capacitor
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A motor capacitor, such as a start capacitor or run capacitor, including a dual run capacitor, is an electrical capacitor that boosts the current to an electric motor, such as in air conditioners, hot tub/jacuzzi spa pumps, or forced air heat furnaces. A round dual run capacitor (described below) is used in some air conditioner compressor units, to boost both the fan and compressor motors.
Contents
1 Dual run capacitors
2 See also
3 External links
4 References
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Motor capacitors include 2 common types, run capacitors and start capacitors:
Run capacitors: - Run capacitors are designed for continuous duty, and they are energized the entire time the motor is running. Run capacitors are rated in a range of 3-70 microfarads (mfd), with voltage classifications of 370V or 440V. Single phase electric motors need a capacitor to energize a second-phase winding. If the wrong run capacitor is installed, the motor will not have an even magnetic field, and this will cause the rotor to hesitate at those spots that are uneven. This hesitation can cause the motor to become noisy, increase energy consumption, cause performance to drop, and cause the motor to overheat. However, a motor will not be ruined just because a run capacitor is faulty.
Start capacitors: - Start capacitors briefly increase motor starting torque and allow a motor to be cycled on and off rapidly. Start capacitors have ratings above 70 microfarads (mfd), with three major voltage classifications: 125V, 250V, and 330V. A start capacitor stays energized long enough to rapidly bring the motor to 3/4 of full speed and is then taken out of the circuit, such as by a centrifugal switch that releases when rotating at or around that speed.
Examples of motor capacitors are: a 35 mfd, at 370V, run capacitor, or an 88-108 mfd at 250V start capacitor.
The motor capacitor, which is a component of a jacuzzi circulating pump, can overheat if defective. This poses a fire hazard, and the U.S. CPSC has received more than 100 reports of incidents of overheating of the motor capacitor, with some fires started.
Dual run capacitors
A dual run capacitor supports 2 electric motors, such as in a large air conditioner unit, with both a fan motor and a compressor motor in the outdoor heat pump. The dual capacitor has 3 wires, labeled “C” or “FAN” or “HERM” for the common, fan, and hermetic (pressure/compressor) electric lines.
Round dual run capacitors (shaped as round cylinders) are commonly used for air conditioning, to help in the starting of the compressor and the condenser fan motor. Dual capacitors come in a variety of sizes, depending on microfarads (uF or MFD), such as 40 plus 5 MFD, and also the voltage. A 440Volt capacitor can be used in place of a 370Volt, but not a 370 in place of a 440Volt. The microfarads must stay the same within 5% of its original value. An oval dual run capacitor could be used instead of a round capacitor, but the mounting strap should be changed to better fit the oval shape.
A faulty dual capacitor often becomes swollen up, with the sides bowed out further than usual: it can be clear to see that the capacitor has failed because it is swollen or even blown apart with capacitor oil leaking. The U.S. EPA stopped allowing manufacturers to produce capacitors with cancer causing PCBs, and because of the replacement materials, the capacitors now have a limited shelf life. When a dual capacitor fails in an A/C compressor unit, either the outdoor fan does not run, the compressor does not run, or both the fan and the compressor motors do not run.
See also
Capacitor (component) - overview of practical capacitors.
External links
“CPSC, Firms Announce Recall of Infinity and Lifestyle Spas”, U.S. CPSC, Washington, DC, 2003-12-09.
References
“CAPACITOR SIZING DILEMMAS” (motor capacitors), LA.gov, Louisiana, 2008, webpage: LAgov-HVAC-motor-capacitor.
^ a b c d e f g h LA.gov, Louisiana (2008-09-24). “CAPACITOR SIZING DILEMMAS (motor capacitors)”. LA.gov. http://dnr.louisiana.gov/sec/execdiv/techasmt/ecep/hvac/d/d.htm. Retrieved on 2008-09-24.
^ a b c d e f g JustTheRightAir (Sept. 2008). “Round Dual Run Capacitors”. justtherightair.com. http://www.justtherightair.com/Round-Dual-Run-Capacitors-p2710.html. Retrieved on 2008-09-24.
^ a b c U.S. CPSC, Washington, DC (2003-12-09). “CPSC, Firms Announce Recall of Infinity and Lifestyle Spas”. CPSC.gov. http://www.cpsc.gov/cpscpub/prerel/prhtml04/04047.html. Retrieved on 2008-09-24.
^ BestBuyHeatingandAirConditioning.com (Sept. 2008). “45/5 Mfd 370 Volt Dual Round Run Capacitor”. http://bestbuyheatingandairconditioning.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CAP455370R&Category_Code=C. Retrieved on 2008-09-24.
^ a b c Arnold’s Service Company (2008-09-21). “”Capacitors””. Arnoldservice.com….(and so on) To get More information , you can visit some products about Copper Fire Pit, quality knives, . The Jewelry Scale products should be show more here!