I rented an electric vacuum pump to dry the lines after I have a friend evacuate the system of old refrigerant...which side do I put the vacuum pump on? I assume it is the "suction side" but dont want to make any mistakes. Thanks

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Hook the evacuator to the center port of a manifold and open both valves.

"How do I use the gauge set with my vacuum pump?
If your ready to vacuum an empty system, you begin by attaching the middle hose (yellow) to the vacuum pump port. With both manifold valves turned off, attach the red hose to the high side service port, and the blue hose to the low side service port. If the system is empty, and ready for evacuation, you should see 0 psi pressure on both Gages. Turn on the vacuum pump and slowly open the high and low side control valves. This opens both sides of the system for evacuation. You should begin seeing the needle on the low side compound gauge drop into the vacuum range. When you are done vacuuming, turn both control valves off, then switch off the vacuum pump. You may now remove the center hose from the vacuum pump. Your blue low side gauge should still indicate vacuum. You can watch this gauge to make sure the system is holding vacuum."

There is a double middle hose which allows you to hook up to vacuum then to refrigerant can without messing with hoses... allowing you to vacuum even the charging hose as compared to having to purge it with refrigerant as you start to fill the system. But I can't find a picture of it right now... Greg