Quincy compressor, model 310, runs slow still -- after rewire for 220

by Steve
(Wichita, Ks.)

I bought an older Quincy compressor, model 310 compressor, 60 gal tank. It was wired for 110, working fine/quiet I thought but "slower" than my other compressor, single stage 5hp 60 gal unit. I wired it for 220 thinking it would run faster but it seems the same as wired for 110. (Motor isn't running faster on 220) Also it bleeds down to around 60 psi before it kicks on. any ideas?? Thanks

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Bill says...

Steve, you are correct. If the RPM of each electric motor you install is the same, regardless of the HP of the motors, the pump will still run at the same speed.

A higher HP motor is used when more power is needed to run a bigger pump, not necessarily to run a compressor pump faster.

"Also it bleeds down to around 60 psi before it kicks on." Are you saying that every time the compressor reaches cut out pressure and stops, the air in the tank bleeds down to 60 PSI, and the compressor stops?

If so, check out your Check Valve.

If I've got it wrong, please post a comment here.

Cheers,

Bill