SF340 flight crew encounters engine bleed and pneumatic system CWP warning messages and decide to return to departure airport for maintenance.

Narrative

We were delayed due to being swapped to an aircraft that Maintenance was repairing. Maintenance was clearing a discrepancy on the left engine intake anti-ice. After Maintenance cleared the discrepancy and released the aircraft; we got underway. Everything went without incident until we were in our climbout at about 14;500 FT; and about 20 miles south of ZZZ1. At that point; a CWP warning sounded an air conditioning master caution. Looking at the overhead panel we had a Right Bleed Closed light illuminated. As the Captain was the Pilot Flying; he called for identify and cancel; which I did; and then an Emergency Non-normal Checklist for environmental/air conditioning. Before I could pull out the POM/checklist; we received another caution for a Right Duct Over Temperature. We completed the appropriate checklists and were instructed to 'wait a while' for the Duct Over Temperature light and Bleed Valve light to extinguish. We 'waited for a while;' approximately 2-3 minutes; and the lights were still illuminated. The Captain shifted control of the aircraft and #1 radio to me while he tried to get further guidance from Maintenance about how long 'a while' was before we should follow the next part of the checklist; which was to 'land at nearest suitable airport.' It took the Captain approximately 5 minutes to contact Maintenance. In the meantime; the Duct Over Temperature light would cycle randomly off and on which would also activate Master Caution warnings. After conferring with Maintenance; it was decided that turning back to ZZZ was the best course of action. Dispatch ran our numbers and agreed that returning was the safest option. The Captain resumed control of the aircraft; we obtained a new clearance from ATC and returned to ZZZ without further event. I would like the Emergency Non-normal checklist to be more specific as to how long to wait for the lights to extinguish. As it is presently worded; 'wait a while;' it is impossible to accurately gauge how long to wait.