Brunner A-514 Air compressor

RXN

New User
Wow is this frustrating.
I bought a Air compressor and 80 Gal tank from a co-worker. he bought it years ago, and never hooked it up because it was missing the motor. I thought this would be easy.

So after wasting close to 3hrs on line I learnt I have a Brunner Model A-514, Type 671MJFO, Serial No. C77F033

I've found out it is a 184T frame, 230Volts.

What I need to know, is the HP and RPM so I can get the proper sized motor and drive sheave.

Thanks in advance for any help.
- Ryan :?
 
Just going on what I have learned messing with compressors over the years, if it is a two cylinder-two stage pump, it probably needs at least a 'real' 5hp motor. A 184t frame, 5hp, 1725-1740 rpm. The pump probably needs to turn around 700-800 rpm max. If one cylinder is bigger than the other, it is a two stage, as you probably know.

A new, name brand, motor like that is in the $400-$500 range. I see that The Surplus Center has a Leeson for a little over $500. Good used 5hp single phase motors are very hard to find. 3 phase, no problem.

Garry
 
Is there any evidence if it was equipped with a 3 phase or single phase motor, as in the wiring, controls?

The largest 184 frame 3 phase motor is 7 1/2 HP. The largest single phase is 5 HP.

The motor RPM will be in the 1700-1740 range. The compressor RPM varies by manufacturer, but typically they run in the 700-800 RPM range.

That you don't know what the recommended HP/RPM specifically is, you could take a chance, make an educated guess, go with a variable pitch sheave so you could fine tune it. A properly configured compressor will run right at the rated motor FLA (full load amps). Be sure the compressor is healthy though before making an adjustment. If the valves are carboned up or leaking, you won't get a good reading.
 
AH, a great old piece of equipment. BRUNER. The BRUNER co. made refrigeration units that were on board SHIPS during the time of the N's series of tractors.

Later DUNHAM BUSH was the name on the compressor "racks".

You will need a magnetic STARTER for the 71/2 hsp motor. Probably 3 phase.

Only difference is if you find a 3 phase motor, your single phase requirements may exceed the wiring in your shop. Lots of times single phase is all there is.

If on single phase, you can start the motor by "kick start" to get her goi'N.
Then the motor will take over and keep turning until the starter trips off on overload.

5 hsp. motors are avail. for single phase. Will require 40 - 50 amps of juice along with some sort of starter, if the motor is not split phase with lots of capacitors.

By adjusting the pulleys the compressor will turn at various RPM's.

We used the adjustments to make a refrigeration system perform for either freezer, regular temp. range (35 deg.) or on board airconditioning. Usually the compressors ran 24 hrs. a day, once started-up. and they used valves to make lots of equipment work, individually.

BRUNER, DUNHAM BUSH. Windsor Locks, CONN. USA CURRENTLY. HARTFORD.

John,PA
 
Thanks guys.

I appreciate the help.
I will look into the 5hp single phase with variable sheave.
 
RXN If you get a 5hp single phase motor made for an air compressor you should be ok, providing you are going to run single phase. Make sure it is for an air compressor there is a difference. If someone tells you there is no difference between a regular motor and a compressor motor -- They don't know what they are talking about. As far as the pulley there should be a tag on the compressor somewhere telling you how fast the pump turns, compute the motor RPM's vs the compressor RPM's to get the size pulley you need.
 
I'm missing tags. Just has the model typeople and serial numbers on it.which makes it difficult.
The driven sheave is 18"OD
And I got numbers off after it.

Sounds like I should be aiming to hit 800-900 RPM on the compressor.
 
i would probably buy this motor
https://www.zoro.com/weg-air-compr-mtr-5-hp-1745rpm-208-230v-184t-
00518os1ccd184t/i/G4270822/
with a variable sheave 9" and smaller
good luck
Ron
 

18" is a monster.. A continuations duty are farm duty 5hp should run it if it don't you can always slow it down to were it will. I have a 27 CFM with a 7 1/2 HP motor 7 1/2 motors single phase are out there.

The most aggravating part of a compressor is the provision to adjust the belts. I have modified mine its still a project I plan to make a mount for the motor to make it EZ to adjust and align the belts.
 
You might consider a WEG brand motor. They are made in Brazil and a local compressor shop sells compressors (also made in Brazil) with these motors, and from what I hear, they are giving good service. I see that Grainger is selling WEG brand now. They may not be much, if any, cheaper than other brands. Just an option.

Garry
 
I bought an old Brunner compressor and tank with no motor years ago.
Mine had a large single cylinder compressor. From my research, I
found that it was intended to run at 500-600 rpm. I set it up in that
range and it was almost too many RPMs, as the whole 80 gallon
horizontal tank would move around on the floor due to the vibration.
If it is a one cylinder I think you need to stay in the 500-600 range,
a two cylinder should be better balanced and be able to run at 700-
800.
 

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