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Vacuum Pump Ballast Control

brucebotti on Fri July 11, 2008 12:17 PM User is offline

Year: 2001
Make: Chrysler
Model: 300M
Engine Size: 3.5L
Refrigerant Type: 134-a
Country of Origin: United States

I have purchased all the parts / oil / 134a to replace my wife's compressor, condenser, receiver/dryer, and expansion valve after taking your expert advice. I now have a vacuum pump question. I have a VWR Scientific / Edwards E2M1 vacuum pump, that has a ballast control on it. I have no idea what this does. I went to their website, and I can't download the instruction manual because it says that the "PDF has been corrupted". I got this pump when my former company moved, and they were going to throw it out. It works great despite sitting in my garage for the last 8 years. It is still available and the retail price is $2,148....OUCH. I'm glad I scarfed it up. If I had known that it was so valuable, I would have put it on the fireplace mantle.

I digress....can anyone enlighten me on the ballast control?


Dougflas on Fri July 11, 2008 12:30 PM User is offline

Ballast on a vacuum pump allows one to pull a vacuum with the valve open so that the vacuum oil doesn't absorb the moisture. When you get to the point that no increase of vacuum level increases, close the ballast valve.

mk378 on Fri July 11, 2008 4:30 PM User is offline

The ballast control admits air into the second stage of the pump. This helps to clear water through it. With the extra air, the water remains a vapor and leaves with the exhaust. Without it, it will condense and foul up the oil quicker.

You should take the oil tank off of your pump (drain oil, remove 4 screws at the corners), and clean all the sludge out of it. There will be sludge in there. Also remove and clean the oil filter which should be a little conical screen near the bottom.

brucebotti on Fri July 11, 2008 9:44 PM User is offline

Thanks for the info....I'll keep you posted!

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