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Adjustable Pressure Air Compressor

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Dino R

03-31-2000 07:02:24




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Our church has a pneumatic thermostat control system for the heating boilers. We have a Quincy air compressor that maintains the air pressure at 45 psi (starts at 20 psi, kicks out at 45). We would like to install a backup air compressor that has a ADJUSTABLE START STOP PRESSURE SWITCH. We would set the spare (backup compressor at 15 psi to start. In this way should the main compressor fail the backup would kick in. I am looking for a reasonably priced unit of about $300, does not have to be an oilless compressor as we have a filters on the system output. There are lots of compressors for sale at Sears, Menards, and dealerships of such but none have adjustable pressure start stop switches. Thank you for any help that you can offer. Dino

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Roger Prosper

04-05-2000 19:54:04




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 Re: Adjustable Pressure Air Compressor in reply to Dino R, 03-31-2000 07:02:24  
Almost all pressure switches have an adjustment screw that will let you adjust your pressure to suit your needs. No one advertises this though because too many people think more pressure will solve all their problems when really what they need is more volume. Virtually nothing needs 200psi! Sometimes, you will also void a warranty if you adjust the pressure settings. For a cheap and easy solution, you could put a regulator on the second compressor and set it to 40psi. The new compressor would be free to cycle at whatever pressure it was set to, but air leaving the tank into the system would never exceed 40psi. The Quincy would then be the backup machine, cutting in when the pressure dropped to 20psi. A Quincy is probably the best compressor ever built, especially pressure lubed, and goes to show you how things were built to last in years gone by. It would be nice to find another, but a $300 Quincy may be tough to find. Proper HVAC compressor units usually utilize pumps of higher quality than average,(cast iron DeVilbiss,Quincy,) and this is reflected in their price. They often recieve little maintenance, so they must be of better quality in order to last. Also, if your Quincy is very old, it may be getting kind of tired. It would be best to let the new machine take the lead role. AVOID all oilless. I wouldn't want to run anything critical on something so hell-bent on self destruction. The parishoners may also wonder what is growling in the basement. Most aluminum pumps are of pretty low quality as well. A cast iron Campbell Hausfeld may be the best route if price is a consideration. Get one that turns fairly slowly, not one geared as a 5hp. A small Champion would also be a good machine. Champions are an exception to the "aluminum is junk" rule.

Roger Prosper

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Dusty

04-02-2000 18:40:30




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 Re: Adjustable Pressure Air Compressor in reply to Dino R, 03-31-2000 07:02:24  
You can get a control called called an alternater, that will run one compressor then when that one turns off the other one will run the next time. If the one that is running gets behind or fails, the other one will start. Costs more but a very good back-up system.

Dusty



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Bill

04-02-2000 16:35:18




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 Re: Adjustable Pressure Air Compressor in reply to Dino R, 03-31-2000 07:02:24  

You could use a pressure switch from a water system, the one that goes on the pressure tank. It's adjustable, just what you need. Have a nice day.



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bbott

03-31-2000 12:56:34




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 Re: Adjustable Pressure Air Compressor in reply to Dino R, 03-31-2000 07:02:24  
Probably one of those safety deals. They all used to have adjustment screws on them... And probably still do inside the control switch housing.

I'm pretty sure that Northern Industrial Supply sells the pressure control switches you're looking for. Then just plumb the tanks together.

bb



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