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The outside ac unit will come on startup but the delay on the start up on the compressor will cause the lights in the house to dim momentairly for 5 or 6 times before either the compressor comes on or the circuit breaker kicks off.The unit is a rudd and is 10 years old .Iwas hoping to get a little more use out of it before replacement.Could this be bandaged by putting a slightly larger capacitor on the compressor? Thanks for any help . bluumoon5
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I would begin by measuring the supply voltage. If you have a low voltage condition which could result from a loose wire terminal or buned or corroded contact in the start relay that would cause the amperage draw to go up.
If the supply voltage is correct attach a snap on ammeter to the common wire from the compessor and measure the total start current. Compare the reading to the rated LRA current on the compressor data plate. If the current is more than 10% greater than the rated LRA you either have a defective capacitor or bad motor bearings.
In you will look in the illustration forum you will find an illustrated instruction that I prepared on how to test a motor capacitor.
If the capacitor tests ok and if the start current was high you might try adding a hard start kit.
The start winding of a compressor is costantly under power when the compressor is running. Adding a bigger capacitor can have a very adverse effect however A hard start kit is an additional capacitor with a built in potential relay that is designed to assist starting older compressors, but it automatically drops out of the circuit when the compressor starts. You can get them at an HVAC supply house--You will need to know the tonnage rating of your compressor or the voltage and FLA (Full Load Amperage) to get the proper hard start kit.
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wanted to let LazyPup know that following advise given ,it turned out to be the capacitor which was the dual type and paid seventy-five dollars for it at supply house.ac is now working fine.
thanks for the info bluumoon5Comment
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