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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by Ignoramus2645 on August 2, 2006, 10:57 pm
>
>>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).
>
> Get an electrician to check your shorts
My shorts are pretty wet by now, from the rain and wet grass.
As far as the wiring, I would like to check out some things by myself
(I am not a big stranger to electricity, built my phase converter blah
blah).
i
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Posted by Ignoramus2645 on August 2, 2006, 10:55 pm
It is quite obviously not very relevant, but there is very solid 24
VAC as input to the contactor's coil.
One pair of contacts (across the contactor) measures 0 ohm. Another
pair, strangely, measures infinity, which is quite strange as the
contactor ought to be closed for a power fault like this to occur
(barring some very strange troubles). I left the outside unit due to
the rain that resumed, will come back there soon.
I am not used to seeing such strange contactors, all contactors that I
dealt with, to date, were three pole contactors for 3 phase motors.
Also, can someone explain me why the capacitor has three sets of
terminals. What is the purpose of the third terminal. Thanks.
i
On Thu, 03 Aug 2006 02:37:39 GMT, Ignoramus2645
> 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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Posted by Ron Moore on August 2, 2006, 11:09 pm
Well, the contactor's apparently bad. Start there. Been there, done that.
Respectfully,
Ron Moore
> It is quite obviously not very relevant, but there is very solid 24
> VAC as input to the contactor's coil.
>
> One pair of contacts (across the contactor) measures 0 ohm. Another
> pair, strangely, measures infinity, which is quite strange as the
> contactor ought to be closed for a power fault like this to occur
> (barring some very strange troubles). I left the outside unit due to
> the rain that resumed, will come back there soon.
>
> I am not used to seeing such strange contactors, all contactors that I
> dealt with, to date, were three pole contactors for 3 phase motors.
>
> Also, can someone explain me why the capacitor has three sets of
> terminals. What is the purpose of the third terminal. Thanks.
>
> i
>
> On Thu, 03 Aug 2006 02:37:39 GMT, Ignoramus2645
>> 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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Posted by Ignoramus2645 on August 2, 2006, 11:13 pm
> Well, the contactor's apparently bad. Start there. Been there, done that.
Hi Ron.
I think that I was wrong. The contactor is OK. I must have mismeasured
something. It has zero ohms across bost pairs of contacts.
I am going to post a little update, it is a little more apparent to
me -- see my separate post.
i
> Respectfully,
> Ron Moore
>
>> It is quite obviously not very relevant, but there is very solid 24
>> VAC as input to the contactor's coil.
>>
>> One pair of contacts (across the contactor) measures 0 ohm. Another
>> pair, strangely, measures infinity, which is quite strange as the
>> contactor ought to be closed for a power fault like this to occur
>> (barring some very strange troubles). I left the outside unit due to
>> the rain that resumed, will come back there soon.
>>
>> I am not used to seeing such strange contactors, all contactors that I
>> dealt with, to date, were three pole contactors for 3 phase motors.
>>
>> Also, can someone explain me why the capacitor has three sets of
>> terminals. What is the purpose of the third terminal. Thanks.
>>
>> i
>>
>> On Thu, 03 Aug 2006 02:37:39 GMT, Ignoramus2645
>>> 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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Posted by Barry on August 2, 2006, 11:32 pm
wrote:
>Well, the contactor's apparently bad. Start there. Been there, done that.
>Respectfully,
>Ron Moore
>
>> It is quite obviously not very relevant, but there is very solid 24
>> VAC as input to the contactor's coil.
>>
>> One pair of contacts (across the contactor) measures 0 ohm. Another
>> pair, strangely, measures infinity, which is quite strange as the
>> contactor ought to be closed for a power fault like this to occur
>> (barring some very strange troubles). I left the outside unit due to
>> the rain that resumed, will come back there soon.
>>
>> I am not used to seeing such strange contactors, all contactors that I
>> dealt with, to date, were three pole contactors for 3 phase motors.
>>
>> Also, can someone explain me why the capacitor has three sets of
>> terminals. What is the purpose of the third terminal. Thanks.
>>
>> i
>>
>> On Thu, 03 Aug 2006 02:37:39 GMT, Ignoramus2645
>>> 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
>>>
>>
>
Does this happen to be San Diego, Ron Moore?
Barry
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Page 2 of 4 < 1 2 3 > last >>
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