Question about Hitachi EC12 Portable Electric 2hp Air Compressor, Oil Lubricated
Normally you can find the setting instructions on the underside of the switch cover.
In almost all compressor switches you will find two adjustment screws. One is for the "Cut-in/Cut-out" or "Cut-on/Cut-off" psi. The other for "Cut-out" psi only. If there is no label the easiest way to tell the difference is by the springs. The "Cut-in/Cut-out" is the larger of the two springs.
Start by turning the smaller or "Cut-out" screw counter-clockwise. This will decrease the Cut-out psi. I would say to back it off 1 1/2 or 2 turns. Now run the compressor and check where your max psi is. Your target is 105psi if your present "Cut-in" psi is 80psi. Once you have that setting at 105psi, move to the larger screw or "Cut-in/Cut-out" adjustment. Turn the screw clock-wise making 1/4 turns adjustment until you reach the 100/125 psi.
By blow off I assume you mean the unloader valve. There really isn't any setting for the unloader because it's built in to the valve itself.
Since there are some variations for this switch please let me know and I'll explain how to make the adjustments for your type.
Or if you are unclear about anything here just let me know and I will be happy to help you out.
Hope this helps.
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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