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Yet Another Onan CCK Question - Won't Run Compressor


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  #1  
Old 02-10-2018, 11:01:44 AM
hertfordnc hertfordnc is offline
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Default Yet Another Onan CCK Question - Won't Run Compressor

This forum has provided amazing support in getting this old beast up and running. I've been using it hard for the last few days.

Today i plugged a brand new 4 gal DeWalt compressor in. Worked fine one time, came up to pressure etc.

Then on the next cycle it groaned and struggled and would not restart.

Brought it home and it worked fine on house current.

Specs say it draws 15 amps.

I have the gen wired to the whole house. electric heaters, fans, a 20 amp saw. It's not showing the slightest hesitation. Just this small compressor.

What am i missing?
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Old 02-10-2018, 11:13:02 AM
Dale Russell Dale Russell is offline
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Default Re: Yet another CCK question- won't run compressor

Try letting all of the pressure out of the compressor and see if it will start then. Just a thought. Maybe it just doesn't want to start with the pressure in the Tank. It would take more amps to start under a load.
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Old 02-10-2018, 11:33:59 AM
Thaumaturge Thaumaturge is offline
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Default Re: Yet another CCK question- won't run compressor

Is your "unloader" working on your compressor? Most non-hobby type compressors have an unloader valve on pressure switch that releases pressure on cylinder when compressor stops. Should hear hiss for short time when compressor stops.
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Old 02-10-2018, 02:26:31 PM
hertfordnc hertfordnc is offline
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Default Re: Yet another CCK question- won't run compressor

Another problem resolved by fully engaging my brain.

The Onan is connected to 60 feet of 10/2 wire that enters the home electrical system through the drier plug, jumpered to get both legs. So the whole house is powered.

heaters, power tools etc have all been working great But apparently all those items are more tolerant of voltage drops.

So i went back to the drier plug and added an outlet right there and the compressor worked great.
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Old 02-10-2018, 03:46:54 PM
Wayne 440 Wayne 440 is offline
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Default Re: Yet another CCK question- won't run compressor

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Originally Posted by hertfordnc View Post
Another problem resolved by fully engaging my brain.
Quote:
The Onan is connected to 60 feet of 10/2 wire that enters the home electrical system through the drier plug, jumpered to get both legs. So the whole house is powered.
I (somewhat) respectfully suggest that a re-engagement is advisable. Transfer switches exist for a reason.
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Old 02-10-2018, 04:09:06 PM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Yet Another Onan CCK Question - Won't Run Compressor

Another unsuspecting victim unwittingly pokes the hornets' nest......
Back-feeding through a dryer outlet is severely frowned upon in these here parts. Just a little too much potential for disaster.
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Old 02-10-2018, 04:42:19 PM
hertfordnc hertfordnc is offline
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Default Re: Yet another CCK question- won't run compressor

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I (somewhat) respectfully suggest that a re-engagement is advisable. Transfer switches exist for a reason.
Ya know, i probably should have avoided mentioning what I was doing on a generator forum.

Really, the power is cut off by the power company, I opened the main breaker along with all the other 240V breakers and I'm only running the generator while I am physically there.

I suppose I could open the panel and disconnect the lines coming in.
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Old 02-10-2018, 06:15:30 PM
Power Power is online now
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Default Re: Yet another CCK question- won't run compressor

Quote:
Originally Posted by hertfordnc View Post
Another problem resolved by fully engaging my brain.

The Onan is connected to 60 feet of 10/2 wire that enters the home electrical system through the drier plug, jumpered to get both legs. So the whole house is powered.

.
If you were closer, I would ask if we could come over and toast marshmallows when the fire starts.
See current thread Total Harmonic Distortion of Portable Generators for a good explanation of what happens when you jumper both hots together with 1 neutral.
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Old 02-10-2018, 06:40:01 PM
DMeed DMeed is offline
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Default Re: Yet another CCK question- won't run compressor

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Originally Posted by hertfordnc View Post
Really, the power is cut off by the power company,..
So you have the perfect opportunity to install a generator panel.


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Originally Posted by hertfordnc View Post
...I opened the main breaker along with all the other 240V breakers ..
Is it locked out/tagged out??!
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Old 02-10-2018, 06:55:34 PM
hertfordnc hertfordnc is offline
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Default Re: Yet another CCK question- won't run compressor

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So you have the perfect opportunity to install a generator panel.




Is it locked out/tagged out??!
It's a rental so no generator panel. I could tag it out but there is no scenario where someone is going to come mess with it. They would be trespassing.

Quote:
Originally Posted by Power View Post
If you were closer, I would ask if we could come over and toast marshmallows when the fire starts.
See current thread Total Harmonic Distortion of Portable Generators for a good explanation of what happens when you jumper both hots together with 1 neutral.
I read the whole thread but I seem to be missing the applicable information.

I'm not arguing or being defensive. Just trying to understand.

Assuming there is no way to electrocute a lineman, I have no sensitive electronics connected etc, which part of this creates a fire hazard?

Would it make a difference if i only used one leg?
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