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Compressor ohms out good but will not start

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#21 ·
If you have resistance and the correct L1 and L2, something will happen. It may not be good but something...If you have no current and have voltage then the circuit is open somewhere. It's operator error 100% of the time...:eek:
 
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#22 ·
It is a home warranty so I will be bringing the body home for autopsy. I forgot to trace all the wiring. I hope someone did not come out before me and screw up the wires... But the question remains, given the numbers above, I think they should be real equal. Maybe .1 or .2 for operator error! I measured more than once.
 
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#24 ·
Bobe5531 said:
So, leave the leads on the compressor, engage the contactor and check the voltage at the compressor
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I know what you are saying. Not my first rodeo. Does anyone have any input on tolerance? Where would additional resistance come from?
 
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#27 ·
54regcab said:
I don't see how you can have a proper ohm and volt readings, but no amp draw. Either you have a bad connection (likely), The compressor is immediately tripping on internal overload (Unlikely), or you aren't getting a good ohm or volt reading (likely for a new tech).
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I have had ATC fuses in more than one case show good (low ohms), make the continuity checker beep, have voltage across it (both sides) with no load, but when the load would come on it would go to zero volts across it. Aggravating!!!!
 
#28 ·
rcstl said:
Bump... This one seemed as good as any. Google won't give me a thread that answers this question, although I have my own logical thoughts.

When Ohming a compressor, SR must equal CS plus CR. is there any tolerance? I thought I saw a thread last year that allowed some. Single phase.

My recent case, CS = 2.1
CR= 1.5
SR= 3.1.

Compressor would not start and not grounded and no humming.
Click to expand...
Did you ohm your meter's test leads for any error? Might be throwing your measurements off. More expensive meters allow you to zero your test leads.

Sent from my SM-N910W8 using Tapatalk
 
#30 ·
First Rodeo was mentioned,but no actual confirmation of a Voltage reading AT the Comp.
This a Molded Plug Term conn by chance,he said again,By Chance???
Ain't my first rodeo either.
 
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#31 ·
Yee hiiigh!

It is not a molded plug, individual spades to CSR.

Replacement compressor ohms out equal. RS = 2.2, CS = 1.4 CR = .8. Check.

CSR showed open to ground.

Original compressor had RS3.1,CS2.1,CR1.5. Out of balance.

Voltage at pulled-in contactor L1,L2 = 242, T1,T2 = 242, no apparent broken or burned wires, HO said I was first to look at it this year but I am going to make sure wiring at T1,T2 is correct and not reversed. I had that frustration before!

It was seasonably cold when I was there, the unit had been sitting for days.

This was my first rodeo this year. I forgot to check for a locked rotor and stuck OL switch. D'oh. I didn't have my Annie wannabe with me that day.
 
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#32 ·
Got to love,'getting back in the saddle again'.
:cheers:
 
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#33 ·
Annie wannabe with me that day.
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I still have 1,what a marvel of Technology back in the Day.:Faint:
Even those cheap Supco 'Meger's' would tell the Truth when in doubt.
 
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mrkelly
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