Quincy Compressor - Strange To Me

[Bib Overalls]

My friend Barry bought this Quincy air compressor at auction the other day. Neither one of us has ever seen anything quite like it.

There is a concept here that I am missing.

Can anyone clue me in?

 

[Mazdaspeed]

Duplex compressor I'd guess?

 

[stonesfan68]

That is a duplex compressor. There was an alternator panel for the unit that would start one machine, build pressure, and then turn it off. When the pressure dropped again then machine #2 would kick on. Sometimes the machines can run simultaneously as well.

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[rustyjames]

I've seen the exact same compressor in a super market we rehabbed, and was used to supply the HVAC controls.

 

[devoncoolman]

Duplex made to run simoutaniously to keep up with high demand. Like a production facility or a huge body shop. Anything where lots of air will be used and 300-500 gallon air tanks are out of the question.

 

[Bib Overalls]

Duplex compressor. Never heard the term before but it certainly seems right. There is no apparent master control. I guess the pumps could be wired one or the other (redundant) or so that, in a 175# psi system one would come on at say #150 and the other at #125.

 

[930dreamer]

Duplex compressors have an alternator that alternate between each compressor, if a huge amount of air is used both kick on. Kams1973 and I did a small resto on this one.

 

[May Pop]

That is an HVAC compressor. It looks to be single stage. As said before it would have had an alternator to swap back and forth between compressor heads. If the pressure drops below a set amount both will run. I have a very similar unit that I have used for the last 20 years. the nice thing about these is they stayed unloaded until the pump is up to speed. This allows a smaller motor to pump an equivalant amount of air. The pressure on these is often set low like 100 PSI to help increase its life. Parts are still available from Quincy. A drawback is they are often 3 phase.
This is a very high quality unit.

 

[Trey T]

duplex compressor system, pretty typical commercial/industrial setup. looks like a 216 model w/ 3-phase motors

 

[Bib Overalls]

Three phase is not a big deal. Barry's shop will have a 25 HP rotary converter. Heaviest continuous air draw is the industrial blast cabinet that is used infrequently. Also plasma and some air tools. Barry also has a large two stage Quincy. He will need to decide which one he wants to use. I'll pass the info on to him. Thanks.

 

[zkling]

You really need to figure out what pumps are on that. They look like 2xx series (singe stage, 100 psi max), possibly 216's (~8CFM @ 90 each) as Trey said. Then see if they will put out the air you need. I use to have a 230 and now run a 270. That setup was likely from an HVAC or fire suppression system. It is not really a high demand, shop use setup with those pumps. A very good unit, but I'm just not sure what your needs vs what it will provide are.

http://www.mesaequipment.com/Html/Products/Quincy/qr25_basic.html