emglo airmate AM78 HC4 serial# 080296299 won't restart under pressure

by James
(Berlin,Md)

My compressor starts fine and runs up to 125 lbs. It will not restart when reaching low pressure set point. It will hum and pop the breaker. Otherwise it has been a great tool for many years. It will restart when pressure get to 0.


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Bill says...

James, this is a classic unloader valve problem. Visit the Unloader Valve page, linked from the site map, and have a read.

Any more questions, post a comment here.

Cheers,

Bill

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compressor overheats and trips thermal shutoff feature of motor

by Adam Stalilonis
(Oakland, ME)

Compressor is used to run a waste oil burner. the compressor runs about 10 sec for every 2 min of time the burner is running. after about 15 min of using the compressor the thermal shutoff pops and the compressor does seem hot. I returned it as it was brand new, was given another one and still have the problem. the compressor was in a small shed so i moved it to open air thinking more ventilation would help. that made no difference. The cooling fan is working but on both of the units the heat sink got very hot and the fan didn't seem to cool it enough. It's a dual tank emglo E810-4V. I did everything as required by the instuction manual with reccomended oil and break in period. I can't figure it out.
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Adam, if the compressor isn't being overheated by the environment, then I wonder about the power supply. Are you using an extension cord?

Bill

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compressor will not start

I have an old twinpack electric 4 gal Emglo air compressor. The problems is that I let my cousin use it. It was working fine and now it just won't start. What do you think the problem could be?

Thank you,
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Could be many issue, most of which are linked from the Troubleshooting section on the sitemap page. Have a look, and then if you've tried everything, post a comment here and we'll press on.

Cheers,

Bill


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Emglo twin stack air compressor - Unit cycles incorrectly

by Tom
(Annandale, NJ USA)

Bill:

I have a 1.5 HP Emglo twin stack air compressor that developed what I thought was a Pressure switch problem.

From an initial manual turn on of the pressure switch, the unit will go to cut out normally, pressure is correct and head pressure is released.

In the next cycle, cut out is at a lesser pressure and it tries to restart for just a second and then stays off for approximately 10 seconds, this cycle will continue until I manually turn the pressure switch off.

The first time the switch is turn on manually , the first cycle is again normal. In viewing the pressure switch with the cover off (when the unit is operating in this abnormal mode) the contacts never fully open, and the schrader valve is not depressed and thus the head pressure is not relieve. The contacts just stay almost closed and apparently make and break contact.

I replaced the original Furnas pressure switch with a new Furnas HD Pressure Switch 95 psi-125 psi Unloader. Nothing has changed; the unit still malfunctions in the same manor. Is it possible that the new switch is also defective or is the problem something else?

Thanks

Tom

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Bill says...

Tom, the symptoms of the first switch suggest to me that it was pooched.

You say the symptoms in the new switch are the same. Did you pull the cover to observe if the same scenario was occurring. If it is, I'm guessing switch.

If the switch appears to function normally, please post a comment here to that effect and we'll delve deeper into the compressor problem.

Cheers,

Bill


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