Can anyone vouche for this unit from Northern Equipment or atleast provide a little background on them ? (Northstar Electric Stationary Air Compressor — 7.5 HP, 26.2 CFM At 90 PSI, 208-230 Vol)
http://www.northerntool.com/webapp/w...47#productinfo

Thanks, Chet

 

Internal search links don't work on many sites. Post an item number and a link to the site and some people may be able to look at it.

Most compressors are imports.

Is it item # 45924 ???

If so then the motor seems to be specified incorrectly:
# Motor: 7.5 HP single phase Leeson motor
# Volts: 230/208Volts/40 Amps

~40 Amps would be a 10HP motor.
~30 Amps would be a 7.5HP motor.
Leeson makes very good electric motors.

Whatever it is the unit probably has a REAL HP motor not some bogus consumer rated unit.

 

Thanks Eric, Yes it is item 45924 and it does specify a Leeson motor, but the description says its a 7.5 horse so I guess that motor must ba a 30 amp ? I think it will suit my needs and it says US made so I'm gonna get one
Chet

 

Either it is a 7.5 HP or a 10HP depending on which spec is right. It looks like a great unit with lots of capacity to do most anything. What are you doing that you need that high pressure and high capacity? According to the website it is on backorder. It is hard to tell from the pictures but the motor does not look big enuf to be a 10HP motor. That is a huge pump tho.

 

Hey Eric, I got the North Star compressor fairly cheap (scratchd paint/factory return) I tend to over buy so I don't outgrow the capacity and I figured I may want to grit blast some parts on my old Mustang. I have a slew of questions about what size wire to run the motor on and also "venting" the pump exhaut outside because my neibor said it would be quite noisey to operate.

 

Wire is cheap, always go a couple guages more than you need and you won't be sorry.
Most people answer the question with "if it's 220 use 10ga", amperage matters, 8 is better, 6ga is what electric stoves are wired with.
As far as venting the exhaust? Do you mean intake?
Your exhaust would be the air pressure going into the tank.

Yes piping the intake outside does quiet them but the downside it more water in the tank when cold or damp outside. The moisture comes from heating up the air when it gets compressed and if it's coming in from outside the temp dif is even more.

This is one of the problems with the "newer" faster compressors. They are all over rated compared to the past, they run them faster than old/big compressors to get more cfm out of less displacement. The downside is that faster means hotter and that means more water and noise.

 

Your neighbor won't like the noise directed at his place. The air intake is a big noisemaker but baffles and bends in the intake passage help reduce the noise. There is another recent thread here on converting a three phase compressor to single phase that has some wire size discussion in it.

 

Thanks for the correction budman-mo, I did mean the intake. Now here is a point re: tank moisture though, My A/C is in the garage which is not currently heated (I have a gas fired heater but not connected) so the inside of the garage is more or less the same temp as the outside. That being said, if I drained my tank on a regular bassis and installed a water trap, would it still be bad to vent the "Intake" outside or should I stick with a baffle and where can I get one ?

Chet

 

Keep the intake inside to avoid antagonizing the neighbors. Construct the intake like a muffler with lots of baffles to break up the sound waves. Fabricate and experiment with various intake filter combinations.