Question about Heating & Cooling
The instructions that come with a starting capacitor are simple enough that they are often printed right on the capacitor itself. But be careful, failing to turn off electrical power, and failing to discharge a capacitor when working on electrical equipment can result in a nasty or even a fatal shock. See our motor starting capacitor safety warnings just below.
The particular starting capacitor to be purchased is matched to the horsepower range and voltage of the compressor or motor being repaired. Many motor starter capacitors to support a pretty wide range of motors. For example our sample capacitor was rated for use on 115V electric motors rated from 1/12 horsepower to 1/2 horsepower.
Prices for typical air conditioner compressor starter capacitors range from around $10. to $50. U.S.
Here are some sample capacitor installation instructions for adding a motor starter capacitor to an air conditioning compressor motor - taken from the product package for a relay and start capacitor intended for use on a refrigerator or freezer. Similar starter capacitors are available for air conditioning compressors.
Remove the power supply cord from the electrical outlet - in other words, be absolutely certain that electrical power has been turned off to the equipment being serviced.
Remove the old starting relay, leaving the old overload protection in place.
Push the wire with the one single pin terminal onto the "start" terminal of the air conditioning compressor. (See the wiring diagram above).
Push the other wire with the pin terminal onto the "run" terminal of the air conditioning compressor.
Connect the line from the old starting relay to the spade terminal on the "run" wire (insulating sleeve).
Restore electrical power
Air Conditioner Motor Starting Capacitor Safety warnings:
When testing a compressor, one must discharge the capacitor first! It'll otherwise have enough power stored on it to be at least very painful. (Author and others have been zapped!) Some systems will automatically discharge the capacitor, but shorting its leads with a screwdriver (after verifying that the power's off) is a safe way to ensure that you won't get shocked. Motor starting capacitors can hold a charge for days!
If oil has leaked out of a capacitor: Don't touch any oil that leaked out: old capacitors may contain PCB oils, an extremely carcinogenic (cancer causing) material which require special disposal.
Once the capacitor has been discharged (as described just above), then it can be tested with a multi meter. Either use the meter's built in capacitor test function, or use this trick: Charge the capacitor by using the sense current the meter puts out when set to ohms. You should observe a rapidly rising resistance before the meter indicates over range/infinity. Disconnect the test leads, and switch over to volts. Then, reconnect the test leads. A voltage reading should be observed, approaching zero.
If the capacitor doesn't hold a charge, or the resistance reading never approaches infinity, it probably needs replacement.
Also, the capacitor may be defective if the compressor hums but does not start. Visual inspection may reveal it to be bulged, or have a blown out safety plug.
For diagram go to this link
Posted on Aug 02, 2010
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Posted on Jan 02, 2017
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