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UPDATE #1 -- Re: A/C problem, need help ASAP

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UPDATE #1 -- Re: A/C problem, need help ASAP Ignoramus2645 08-02-2006
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Posted by Ignoramus2645 on August 2, 2006, 11:18 pm
Some new developments.

1. The main 24VAC coil contactor is fine, I must have mis-measured
something.

2. I understand why there are three terminals on the capacitor. There
are really two capacitors in one "can". They share a common. One
capacitor is for fan and another is for the main compressor motor.

3. If I disconnect one lead to the capacitor (a fat blue lead), then,
if my wife resets the breaker, the cooling fan starts up just fine and
I hear humming noise from the motor. I did not let that continue for
much more than 2 seconds.

My conclusion is that most likely, the capacitor for the main motor is
shot.

Q U E S T I O N S:

1. Anyone know how to calculate required capacitance by "rated amps"
of the motor? (I realize that motors are all different, but I need
some way to guesstimate)

2. Do the two coexisting caps share a common terminal, or does one of
them have one contact on top and another being the (grounded) can?

Answers will be appreciated.

More to follow.

i


Posted by CJT on August 2, 2006, 11:20 pm
Ignoramus2645 wrote:

> Some new developments.
>
> 1. The main 24VAC coil contactor is fine, I must have mis-measured
> something.
>
> 2. I understand why there are three terminals on the capacitor. There
> are really two capacitors in one "can". They share a common. One
> capacitor is for fan and another is for the main compressor motor.
>
> 3. If I disconnect one lead to the capacitor (a fat blue lead), then,
> if my wife resets the breaker, the cooling fan starts up just fine and
> I hear humming noise from the motor. I did not let that continue for
> much more than 2 seconds.
>
> My conclusion is that most likely, the capacitor for the main motor is
> shot.
>
> Q U E S T I O N S:
>
> 1. Anyone know how to calculate required capacitance by "rated amps"
> of the motor? (I realize that motors are all different, but I need
> some way to guesstimate)
>
> 2. Do the two coexisting caps share a common terminal, or does one of
> them have one contact on top and another being the (grounded) can?
>
> Answers will be appreciated.
>
> More to follow.
>
> i
>
There ought to be a diagram somewhere, and some markings on the
capacitor, that will tell you what you need to know. Anything else
is just guessing.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Posted by Cydrome Leader on August 2, 2006, 11:27 pm
> Ignoramus2645 wrote:
>
>> Some new developments.
>>
>> 1. The main 24VAC coil contactor is fine, I must have mis-measured
>> something.
>>
>> 2. I understand why there are three terminals on the capacitor. There
>> are really two capacitors in one "can". They share a common. One
>> capacitor is for fan and another is for the main compressor motor.
>>
>> 3. If I disconnect one lead to the capacitor (a fat blue lead), then,
>> if my wife resets the breaker, the cooling fan starts up just fine and
>> I hear humming noise from the motor. I did not let that continue for
>> much more than 2 seconds.
>>
>> My conclusion is that most likely, the capacitor for the main motor is
>> shot.
>>
>> Q U E S T I O N S:
>>
>> 1. Anyone know how to calculate required capacitance by "rated amps"
>> of the motor? (I realize that motors are all different, but I need
>> some way to guesstimate)
>>
>> 2. Do the two coexisting caps share a common terminal, or does one of
>> them have one contact on top and another being the (grounded) can?
>>
>> Answers will be appreciated.
>>
>> More to follow.
>>
>> i
>>
> There ought to be a diagram somewhere, and some markings on the
> capacitor, that will tell you what you need to know. Anything else
> is just guessing.

He's better at the guessing part. I suggest he wears a blue shirt
tomorrow, and white socks.

Posted by Ignoramus2645 on August 2, 2006, 11:44 pm
> There ought to be a diagram somewhere, and some markings on the
> capacitor, that will tell you what you need to know. Anything else
> is just guessing.
>

Yea. Great idea. Here's the diagram:

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

It is actually very straightforward.

i


Posted by Pete C. on August 2, 2006, 11:59 pm
Ignoramus2645 wrote:
>
> > There ought to be a diagram somewhere, and some markings on the
> > capacitor, that will tell you what you need to know. Anything else
> > is just guessing.
> >
>
> Yea. Great idea. Here's the diagram:
>
> http://igor.chudov.com/tmp/AC-Compressor/diagram.jpg
>
> It is actually very straightforward.
>
> i

It's also rather sad that the protective devices are "optional" or
"accessories".

Pete C.

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