Hello krystalmaree and welcome to Apple Discussions.
The drivers I posted were for the imagePASS-C1, which is an optional print controller (also known as a Fiery) that attaches to the back on the imageRUNNER. If you don't have this print controller connected to your iRC3220 then this driver will not work.
To check if you have the imagePASS, have a look at the back of the iRC3220. If you see a white metal box that has a separate power cord, two network cables and another cable that connects between the iRC3220 and the metal box, then you have the imagePASS.
If you don't see the metal box then you have the internal Canon board. In this case, you need to use the Canon PPD (as the UFR driver mentioned in the other reply does not support your iR). You can download the v2.70 PPD installer via the following link...
http://www.service.canon.com.au/drivers/files/ir/macppdv270.zip
After running the installer, you can add the printer via IP > LPD. Enter the IP address of the printer, a queue name of LP, and in the Print Using menu select Canon iRC2620/C3220.
Pahu