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A/C problem, need help ASAP Ignoramus2645 08-02-2006
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Posted by Richard J Kinch on August 3, 2006, 12:11 am
Ignoramus2645 writes:

> Also, can someone explain me why the capacitor has three sets of
> terminals. What is the purpose of the third terminal.

Two capacitors, in one can, with a common terminal.

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Posted by Ignoramus2645 on August 3, 2006, 12:28 am
> Ignoramus2645 writes:
>
>> Also, can someone explain me why the capacitor has three sets of
>> terminals. What is the purpose of the third terminal.
>
> Two capacitors, in one can, with a common terminal.

Yes, that's right. You got it 100%. Here's the schematic:

http://igor.chudov.com/tmp/AC-Compressor/diagram.jpg


i


Posted by Tony on August 3, 2006, 12:01 am
This is symptomatic of a bad compressor. Try testing the motor leads for a
dead short (to each other and ground). There are start and run leads. You
may need a HVAC guy to replace your compressor and recharge the system.

Tony

> I have a central A/C. Around when there was a thunderstorm,
> electricity flickered about 2-3 times in our house.
>
> Now our A/C is not working. The inside is all fine, the fan runs etc.
>
> I am doing investigation and will post in this thread, but the breaker
> popped and any attempt to reset it pops it again. I tried to measure
> amps with my ammeter, it was quite hard to do due to breaker popping
> soon, but the highest measure I got was about 200 amps.
>
> I am going to open up the case now to have a quick look, I will be
> running back and forth. My hope is that it is something simple like
> capacitor shorted, but it easily could be worse (eg motor shorted).
>
> i
>



Posted by Ignoramus2645 on August 2, 2006, 11:57 pm
> This is symptomatic of a bad compressor. Try testing the motor leads for a
> dead short (to each other and ground). There are start and run leads. You
> may need a HVAC guy to replace your compressor and recharge the system.

Good idea, I will check motor leads for leaks to ground. (the main
motor leads should read a very low resistance to one another).

i

> Tony
>
>> I have a central A/C. Around when there was a thunderstorm,
>> electricity flickered about 2-3 times in our house.
>>
>> Now our A/C is not working. The inside is all fine, the fan runs etc.
>>
>> I am doing investigation and will post in this thread, but the breaker
>> popped and any attempt to reset it pops it again. I tried to measure
>> amps with my ammeter, it was quite hard to do due to breaker popping
>> soon, but the highest measure I got was about 200 amps.
>>
>> I am going to open up the case now to have a quick look, I will be
>> running back and forth. My hope is that it is something simple like
>> capacitor shorted, but it easily could be worse (eg motor shorted).
>>
>> i
>>
>
>


Posted by Ignoramus2645 on August 3, 2006, 12:07 am
> This is symptomatic of a bad compressor. Try testing the motor leads for a
> dead short (to each other and ground). There are start and run leads. You
> may need a HVAC guy to replace your compressor and recharge the system.

Um, no, that could not be the case. If I disconnect the cap's fat blue
lead and let the cap hang in the air, the breaker does not blow, the
blower runs, and the compressor hums (I am sure that it does not run).

It is very likely the cap.

i

> Tony
>
>> I have a central A/C. Around when there was a thunderstorm,
>> electricity flickered about 2-3 times in our house.
>>
>> Now our A/C is not working. The inside is all fine, the fan runs etc.
>>
>> I am doing investigation and will post in this thread, but the breaker
>> popped and any attempt to reset it pops it again. I tried to measure
>> amps with my ammeter, it was quite hard to do due to breaker popping
>> soon, but the highest measure I got was about 200 amps.
>>
>> I am going to open up the case now to have a quick look, I will be
>> running back and forth. My hope is that it is something simple like
>> capacitor shorted, but it easily could be worse (eg motor shorted).
>>
>> i
>>
>
>


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