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IDENTIFIYING COMPRESSOR TERMINALS  Rate Topic 
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 Posted: Thu Sep 9th, 2010 09:44 pm
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Bobice

 

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Using a good multimeter set on ohms, remove the compressor terminal cover with the unit off.

Touch one lead (of the meter) to one terminal and the other lead (of the meter) to one other terminal and record your reading . Lets call these terminals (A) and (B). The remaining terminal lets call (C)

So for example A-B=7 Ohms

Now lets read A-C and record. Lets say 5 Ohms

Now lets read C-B and record. Lets say 12 Ohms

Now lets add all the A's= 12 Ohms

Now lets add all the B's=19 Ohms

Now lets add all the C's=17 Ohms

The highest reading will be the "Start" winding

The next highest reading will be the "Run" winding

The lowest reading will be the "Common" winding

Therefore B= "Start"

The next is C="Run"

The remaining terminal A= "Common"



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 Posted: Fri Sep 10th, 2010 02:35 am
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Domo for posting these most sagacious and expeditious pearls of appliantological wisdom, Brother Bob! :dude:



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 Posted: Fri Sep 10th, 2010 02:00 pm
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JJDH

 

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Most compressors now go c-r-s...top to bottom, left to right. on residential more than 5 ohms total something is going on whether its age or wearing down... c
common to start
common to run
run to start should be equal to the above readings combined.

Last edited on Sat Sep 11th, 2010 12:00 am by JJDH



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 Posted: Fri Sep 10th, 2010 03:43 pm
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For most of the compressors, I start at the single one, going clockwise..... common..... run....start  ............ C.R.S.........   Can't...Remember.....Shit.........          What throws me for a moment is when   Common....Main....Phase............   is used..  

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 Posted: Fri Sep 10th, 2010 09:40 pm
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Bobice

 

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Ah Yes as usual some people are never happy. :P

The ohm values given were not specific to any compressor, just used for LEARNING but alas there is always someone complaining. :shock:



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 Posted: Sat Sep 11th, 2010 12:01 am
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JJDH

 

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Just adding to the useful info.  

edited order above..



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 Posted: Sat Sep 11th, 2010 01:25 am
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Bobice

 

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JJDH wrote: Most compressors now go c-r-s...top to bottom, left to right. on residential more than 5 ohms total something is going on whether its age or wearing down... c
common to start
common to run
run to start should be equal to the above readings combined.

Not all compressors  follow the left to right rule.

Common to Start in the examle =7 Ohms

Common to Run in the example =5 Ohms

Common to Start in the example = 12 Ohms

Again this is an exercise using the multimeter which alot of "Technicians" as well as "Newbies"

could benefit from.



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 Posted: Sat Sep 11th, 2010 02:00 pm
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JJDH

 

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I agree. some older compressors dont use that rule. From what ive seen most all of todays compressors use it,of course there are probably those lone odd units..... techs need more trouble shooting and less parts changing.



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 Posted: Sat Sep 11th, 2010 06:25 pm
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Bobice

 

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:D :D We at least agree on the training.

Before being laid up I worked with *NATE   giving a prep course and was amazed at how many technicians were poorly schooled.

The other sad part were the "Technicians" who went to pay per learn trade schools and were clueless.

As far as compressor terminals Embraco were the first ones I came across with common on bottom,run on left and start on right.

*North American Technician Excellence.



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40 Years HVAC/R service, sales,installations. a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/
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 Posted: Sun Sep 12th, 2010 04:39 am
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JJDH

 

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I am nate certified. What I hate is the hrs needed to keep up the cert.

Last edited on Sun Sep 12th, 2010 04:39 am by JJDH



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 Posted: Sun Sep 12th, 2010 06:44 pm
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Bobice

 

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Worse is there is "No Hands On" requirement to be "Nate" cerified.:X



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