Bgrigg wrote: |
I wonder why dialing down the pressure triggers the shut down? You would think it would try to turn on. |
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It shuts down because it has a shut-off safety pressure switch which prevents the compressor from being dead-headed, or overloaded, for too long a time, thus extending the life of the compressor.
Dead-heading (running it with no air flow) a compressor puts excessive wear on the moving parts and bearings that cycle the piston/diaphragm, as well as on the pistin/diaphragm as well, thus shortening the life of all those items.
Thus, cranking down the pressure further restricts the air flow, which essentially increases the back-pressure to the compressor, giving it a faster build-up to the safety presure shut-off switch, telling it to shut down, which temporarily shuts the unit off until the pressure drops again, due to increased air flow, extending the unit's lifespan.
This helps the manufacturer form getting a lot of prematurely worn or failed compressors while under warrenty.
The only thing is that after a while you might have to replace the pressure switch, which is no big deal.
That is how my new Harbor Tool unit works straight from the factory, with a pre-set regulator and all:
OK?
Tom
Tom T
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