Question about Northern Industrial 2 Hp Twin Tank Electric Air Compressor

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Starting the unit

My compressor (a portable) starts pumping when I turn it on. It goes up to 120 lbs and then at the point it is to shut off, it does. The air then starts escaping from the compressor switch and purges the tank down to 70 lbs; I believe that this is through the unloader which is built into the pressure switch. The compressor tries start up again, but fails and repeats this action until I shut the system down by pulling the plug because if I try to depress the on and off switch it lets more air out of the tanks. The pressure switch was replaced with a new one, but this did absolutely no good, it keeps doing the same thing.

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I am thinking it is 110 volt. the reason I mention that is because I had a similar problem with powering back on but without the air leakage. Narrowed it down to insufficient power supply. As it didn't do it all the time. And I think the built in thermo protector somehow had an effect. Think the motor heated up faster due to not enough current, and the thermo protection tried to keep it from starting but wasn't working properly to start with I don't think after it was a year or so old. It drew 15 amps, That is a big draw. Turn on a skill saw at the same time there went the breaker. Different locations it acted differently.

In your case I think if you replace that entire power switch pressure unloader assembly. It sounds like at least your describing an assembly, that definately sounds faulty and may be the root of the whole problem. Then just to check, check your amp draw for the compressor and make sure the circuit your plugged into doesn't have a lot of other demands. Better to get 25 feet more of air hose then use an extension cord, depending on your amps for your compressor.
The way it's described sounds like the on off switch, pressure switch that controls the auto on and off, and the pressure relief/unloader valve are all together. So when you say you replaced the pressure switch, did you replace the whole assembly ? If I am calling that correctly in picturing it as being one combined unit ?

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Posted on Nov 20, 2008

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