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COMPRESSOR QUESTION MAG STARTER OR NOT?

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Forum topic by a1Jim posted 1183 days ago 4183 views 0 times favorited 22 replies Add to Favorites Watch
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a1Jim

112015 posts in 2209 days


1183 days ago

Topic tags/keywords: resource

Hi gang

My old compressor bite the dust some time ago because of my economic situation I wasn’t able to think about replacing it now . I found a husky 7 1/2 hp 2 stage compressor with and 80 gal tank that looks all but new and since the seller agreed on $ 550 delivered it was hard to turn down. The seller says it has not been used at all except to check it out once because he has kept moving and has not had a place to hook up the 220 single phase motor. After thinking about it I was wondering if this compressor needs a magnetic starter since days gone by I needed one on a 20hp compressor I had 30 years ago. Maybe motors are different than they were back then. It would be a big help if I knew if I need a mag starter because it would make a difference weather I can afford this compressor or not. Here’s a link I looked at regarding the same question but not being an electrical expert I’m not sure who’s right. http://www.garagejournal.com/forum/showthread.php?t=87388

This is Husky model HS781002AJ if that helps

I would appreciate any help you electrical experts can give. Thanks Jim

-- http://artisticwoodstudio.com Custom furniture


22 replies so far

View Bertha's profile

Bertha

12951 posts in 1325 days


#1 posted 1183 days ago

I know just enough about electricity to kill myself. I have a fancy Fluke meter, to make me look like I know more than I do;) I’ve got a magnetic starter on my big 220V bandsaw but my older 20Gal 220V compressor did not. I replaced it with a 100V DeWalt Emglo for space reasons, and I miss the air my bigger guy could generate. I’m curious about this, too, so I’ll tune in.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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sandhill

2119 posts in 2555 days


#2 posted 1183 days ago

Simple answer Jim If it needed it it would come with it. Good deal on your purchase I am sure you are aware its the CMF you need not the storage but its a good bet that a two stage will suite you fine. Good luck

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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b2rtch

4318 posts in 1680 days


#3 posted 1183 days ago

Jim,
I tend to agree with sandhill,and on this part break down they show no mag switch.

www.aircompressorpartsonline.com/husky-hs781002aj-p-51942.html
My conclusion is that you do not need any.
Bert

-- Bert

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lew

10002 posts in 2387 days


#4 posted 1183 days ago

I think the need for the magnetic starter is based on the current rating of the pressure sensing switch on the compressor. A 7.5 hp motor will draw a lot of current when it starts up under load and this could overload the contacts in the pressure sensor.

I’m not expert at this and can be completely off base here.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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sandhill

2119 posts in 2555 days


#5 posted 1183 days ago

Most smaller 220VAC are Capacitor Start motors to overcome the start up torque until the amps settle down on the other hand Magnetic start switches are different from normal on/off switches. They are used on medium and larger power tools as a safety device. Among other features, they prevent the tool from remaining in the “on-state” after it is unplugged or a power loss occurs. (To test whether your tool has a magnetic starter or not, turn the tool on, unplug the tool, and if the tool begins running when you plug it back in, then it is NOT a magnetic starter.) A Magnetic starter uses a spring loaded, self-sustaining relay.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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mrg

521 posts in 1631 days


#6 posted 1183 days ago

Jim,

I looked up the compressor in question. It is built by cambel hausfield and the manual said to the motor name plate. From going over the manual quickly it looks like you just need 220v and are good to go.

If you would like for me to send you the pdf just pm me.

-- mrg

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a1Jim

112015 posts in 2209 days


#7 posted 1183 days ago

Thanks Guys I appreciate all your help. According to the on line manual it’s rated at a maximum of 22 amps. I won’t have the compressor until tonight and then I have to rig up temporary wiring using a heavy duty extension cord to test the compressor out before I buy it. I think my existing 220 circuits have 20 amp breakers so I hope that works. I noticed on this link http://www.garagejournal.com/forum/showthread.php?t=87388 they showed how to hook up a switch for 220 does that look good to you guys
Thanks
Mrg If you can give me a link for that it would be great. I found a manual too but I’m not sure it’s complete.

-- http://artisticwoodstudio.com Custom furniture

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MrRon

2797 posts in 1875 days


#8 posted 1183 days ago

Before buying it, I would open the drain at the bottom of the tank and examine any water that comes out. If there is a lot of water and it looks cruddy, the bottom of the tank may have a bad rust problem. Proper maintenance requires you to empty the tank of water every day.

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Bertha

12951 posts in 1325 days


#9 posted 1183 days ago

Mr Ron, thanks for this gentle reminder. I’ll be checking mine tonight!

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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mrg

521 posts in 1631 days


#10 posted 1183 days ago

Here you go Jim.
Manual

-- mrg

View DLCW's profile

DLCW

522 posts in 1286 days


#11 posted 1183 days ago

I’ve got this exact compressor connected to a circuit breaker box. I fed 220vac 50amp from the main power panel to a sub breaker box. The power cord for the compressor ties right in to this breaker box. I turn the thing on by just flipping the breaker to on. Don’t turn the breaker off until the compressor stops running.

-- Don, Diamond Lake Custom Woodworks - http://www.dlwoodworks.com - "If you make something idiot proof, all they do is make a better idiot"

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a1Jim

112015 posts in 2209 days


#12 posted 1183 days ago

Thanks a lot mrg a that should really help.

Hey Don just back from the hardware store were the guy behind the counter told me almost word for word the same thing even the part about having the same exact compressor. I guess you didn’t need a mag starter either? Thanks that’s a lot easier than using a knife switch. I wired my whole shop and a couple before that and passed code first time every time but I’m always a little gun shy about things with more than 20 amps.

Every ones been a great help
thanks tons

-- http://artisticwoodstudio.com Custom furniture

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sandhill

2119 posts in 2555 days


#13 posted 1183 days ago

Jim the photo you are referring to is for a 110VAC motor don’t do it buddy….

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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a1Jim

112015 posts in 2209 days


#14 posted 1183 days ago

Sandhill The photo I originally posted was the one from the ad but it was so poor I found found one on line that look just like it I thought, here’s the original .

I couldn’t read what the substituted photos label said, but if someone told me it was the one I’m buying I would have believed them right down to being bolted to a pallet .I guess you have eagle Eye’s :)

-- http://artisticwoodstudio.com Custom furniture

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sandhill

2119 posts in 2555 days


#15 posted 1183 days ago

Jim, I hope to be in my new shop soon and will be using MS switches for all my equipment Basicly I am using 110VAC to turn on 220VAC machines as well as 277 lighting that will also be on relay controls. The Mag Sw is just a safety device to keep a ckt De-energized. Anyway you need to kee Be safe buddy.p that compressor on its own ckt because it will run for a long time to fill the tank when needed and if you have it on the same ckt as say your Table saw you could over load the breaker; say your just about full at the tank so you may draw 7 – 9 amps and if you start the saw your looking at say another 12 amps on start up? You see where I am going?

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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