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Tool Talk Discussion Forum

Sears Air Compressors-fire hazard?

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jubilee johnny

02-05-2007 06:54:35

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Last week on the tractor talk forum someone said they had a shop fire that could have been caused by a craftsman air compressor. Could someone explain why they would be a fire hazard (if I understood correctly) as I have a 7hp 175psi "professional" sears compressor in my shop that I like very much.

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dave guest

02-05-2007 19:44:34

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 06:54:35

I got intercom in barn to house, so I hear anything happens out there. If I leave compressor on it will wake me up and I have to turn it off. Also good for intruders,squirrels,birds, chickens, dogs.

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Bus Driver

02-05-2007 16:36:00

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 06:54:35

My compressor, true 5hp , 2-stage, 175psi, has the pressure switch on the compressor. The magnetic starter is mounted on the wall nearby. The compressor switch handles only the current for the operating coil of the starter. In the wire run between the compressor switch and the starter coil, I have a spring-wound 12 hour timer without a "hold-on" position. The timer can be set for up to 12 hours, no more. If I am using air that day, I typically turn the timer to 3 hours. At the end of the preset time, the timer switch opens and the compressor cannot start. My unloader is separate from the pressure switch, so it unloads even if the compressor happens to be running when the timer shuts off.

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Bob

02-05-2007 17:15:04

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Re: Sears Air Compressors-fire hazard? in reply to Bus Driver, 02-05-2007 16:36:00

Bus,

That sounds like a GREAT idea. My late Uncle, who did a lot of grain elevator wiring, set up my shop with a "shop panel" and an "office panel", much like grain elevators he wired.

When leaving, you pull the "shop main", and everthing besides a few lights for exit and entry, and the heating system gets powered down, HOPEFULLY minimizing the chances of something malfunctioning, and setting a fire.

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jubilee johnny

02-05-2007 08:39:09

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 06:54:35

Ok, I understand better. I always have mine off except when using tools requiring air. I guess if I left the shop and forgot to turn it off I could get into trouble. I always shut off the valve at the tank as well when not using it. My tank is 80 gal I believe. So there are better safety devices on other brands if a hose brakes to shut the compressor down. Is this what you are saying?

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Eric SEI

02-05-2007 19:23:48

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 08:39:09

I don't know about now but back in 1977 Sears and John Deere and Montgomery Ward were all built on the same lines in the Campbell Hausfeld plant in Harrison, OH. The only differences were the paint, decals, and the plastic belt shield.

I doubt that you can say a particular brand is safer, because it is hard to know who actually built it.

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Bob

02-05-2007 15:13:11

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 08:39:09

I never said other brands has better safety equipment.

I simply suggested ANY compressor can get DARNED hot if it runs steady, for one reason or another.

And, I suggested powering down ANY compressor, when leaving the shop.

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jubilee johnny

02-05-2007 08:37:27

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 06:54:35

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Bob

02-05-2007 07:09:08

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Re: Sears Air Compressors-fire hazard? in reply to jubilee johnny, 02-05-2007 06:54:35

The air compressor is one of the things that gets shut off when I leave the shop.

If a hose were to break, or other air leak would occur, those things can get DARNED hot when they run steady, trying to build pressure.

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IH2444

02-05-2007 07:35:17

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Re: Sears Air Compressors-fire hazard? in reply to Bob, 02-05-2007 07:09:08

Of course the thermal overload should trip in the motor before a fire happens.

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Bob

02-05-2007 07:47:14

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Re: Sears Air Compressors-fire hazard? in reply to IH2444, 02-05-2007 07:35:17

The COMPRESSOR itself gets DARNED hot, too, and, since the thermal overload in the motor resets as soon as it cools a bit, and the cycle continues until you return and shut it off, or something finally fails, and the motor "burns out", probably emitting a shower of sparks!

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IH2444

02-05-2007 12:32:34

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Re: Sears Air Compressors-fire hazard? in reply to Bob, 02-05-2007 07:47:14

I guess this is why I shut off my compressor when not in the shop.

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