Per Broad Street Hockey, Nodl has been temporarily sent to the Phantoms due to roster size constraints

According to THIS article on Broad Street Hockey, the Flyers had to temporarily assign Andreas Nodl to the Phantoms in order to trim their roster size to 23.

Ian Laperriere (post-concussion syndrome) and Michael Leighton (bulging disk in lower back) are not on the LTIR yet, though it's expected that both of them will eventually go on the long-term injured reserve. Assigning them to the LTIR would remove them from the active roster; the Flyers roster stands at 25, when it must be 23 by noon today.

Therefore, Nodl was sent down as a roster-trimming move, though according to Paul Holmgren, he will be recalled when the Flyers have cleared room for him on the active roster.

I sure hope he doesn't have to haul himself and all his gear 288 miles to Glens Falls, if he's going to be back on the Flyers roster in the immediate future. This is the kind of thing that makes me (and, I'm sure, the Flyers brass) miss the days when both teams operated out of the same practice facility. Callups and send-downs merely required a player to walk to the opposite side of the same building. Oh, well.