PeterD wrote:
On Thu, 04 Mar 2010 05:13:31 GMT, lid (Sparks
Fergusson) wrote:
I'm having a problem with my 20 gallon, single stage electric air
compressor. ...
Bad pressure switch. The unloader is part of the pressure switch so if
it is being activated, the pressure switch is 'saying' that the
pressure is sufficient. Maybe it is just mis-adjusted.
Actually, it's a mechanical unloader (combination check
valve/unloader, which I have already cleaned and lubricated.) It seems
to be working well.
Check the adjusting screws, and reset the cutoff back to 120 PSI.
Confirm the cuton is at 95 PSI.
The pressure swicth seems to be working fine. If I turn down the
pressure adjustment, I can get the contactor to turn off the motor
before it stalls, but that's only 90-95 psi or so. If I adjust it
higher, the motor is unable to turn the compressor if the pressure is
more than 95-100psi. It's definitely the motor stalling, not the
pressure switch opening.
Thanks!