My Delta 1010 rack-mount unit seems kind of warm after a period of time. Is this normal, or is something wrong.

Many electronic devices will have some heat dissipation, and this is normal for the Delta 1010. If you have the 1010 rack unit inside a rack, it is best to keep some air space above the unit (but not necessarily below it). If you have several devices in your rack that are building up heat, you might want to add a fan to the back of the rack. There are "silent" fans that are very efficient, and are available in many electronics, high-end audio, or computer stores.