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  #16 (permalink)  
Old 09-26-2009, 10:54 AM
NEW INTERIORS's Avatar
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I ran mine like that for about 10 year.. It started tripping the thermal switch on the motor.. But I fix it now..

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  #17 (permalink)  
Old 09-26-2009, 01:40 PM
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Since you got away with it for 10 years you are either very lucky or you have a darn good motor or both!

Using an "Amp clamp" to check the current draw during start-up when the unloader is working properly vs when it is plugged off will show just how much extra load the motor is under at start-up, if the compressor is in a cold location this can be nearly twice what is normally required. Actually on older compressors with a worn pump this valve will become less critical than it will on a newer pump simply because the pump will by-pass some of the pressure when an older pump starts. By-passing this valve usually will seem to work at first but then it can cause a whole range of problems from a tripped breaker (if you are lucky) to a stalled motor or even a damaged motor! If that little hiss either stops happening or does not stop after it starts then it should be taken VERY seriously and immediate attention is required. 99% of the time it will be a simple and very inexpensive (sometimes no cost at all) fix but if it is ignored, or worse by-passed, then the results can indeed get very troublesome and expensive!
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  #18 (permalink)  
Old 09-26-2009, 01:50 PM
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If the max pressure the compressor is set at is low, the unloader isn't as critical, either. But a working unloader just makes sense- no reason to cause a large current draw every time the compressor starts up. Prolly more wear and tear on the capacitors, contact points and circuit breakers than anything.
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Old 09-26-2009, 02:00 PM
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Something that should be mentioned is those capacitors can pack quite a wallop even with the unit unplugged. After unplugging the unit it is usually a good idea to short the cap terminals to discharge them.
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  #20 (permalink)  
Old 09-26-2009, 03:04 PM
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Quote:
Originally Posted by T-bucket23
Something that should be mentioned is those capacitors can pack quite a wallop even with the unit unplugged. After unplugging the unit it is usually a good idea to short the cap terminals to discharge them.


That certainly is worth mentioning and it should have been brought up already, thanks for keeping the rest of us on our toes!


Just last night I got "walloped" pretty good while poking around in a large AC inverter that had been unplugged from the battery power for several minutes.
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  #21 (permalink)  
Old 09-28-2009, 02:31 AM
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Back when condensers were as common as dirt, there was always some jack-leg w/too much time on their hands that would charge one up on a 12 v battery- then leave it laying somewhere that it would be picked up by an unsuspecting target.

If it was picked up in such a way that the case and pigtail terminal were touched at the same time...
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Old 09-28-2009, 07:34 AM
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The trick was to charge it with a spark plug wire, just connect the plug wire to the lead on the condenser, hold the body of the condenser close to the engine and let it arc a time or two, then find an unsuspecting victim and yell "here catch" as you toss it to them!

Of course I would NEVER do anything like that!
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  #23 (permalink)  
Old 09-28-2009, 08:26 AM
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cold starts

a few years ago when the kids were still at home they turned on the compressor and left it on. when the temp dropped below freezing at night It tried to restart and the pump did not get enough lube and damaged the rod bearings and crank. I was able to polish the crank and had to buy 2 new rods. I made dippers and drilled and x'd the bearings like we used to do on old model T fords. I bought electrical pipe heater cord and wrapped around the pump to keep it warm... Brr It's predicted to start snowing tomorrow night.
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