CRJ-700 flight crew reported malfunction with rudder pedal steering control during takeoff roll resulting in a rejected takeoff.

Narrative

Reported to the MRO to repo an aircraft to ZZZ1. Performed all pre-flight inspections and checklists. Flight was to be a test flight after both engines were changed and flight controls had been removed. Our flight control checks and taxi by use of the tiller was normal. On the takeoff roll; after advancing power to takeoff and transitioning to steering with the rudder pedals; I could not maintain directional control of the aircraft and we began to veer right. I rejected the takeoff thinking I had lost steering ability. After further assessment we determined that the rudder pedal input to nosewheel steering was reversed. Input to the left rudder pedal steered the aircraft to the right; input to the right rudder pedal steered the aircraft to the left. The tiller functioned normally (correct steering); and the rudder indication showed correct deflection of the rudder according to rudder pedal input. The takeoff was rejected at approximately 30 kts.Cause: Incorrectly installed rudder pedal controls to the nosewheel steering system.Suggestion: We currently don't test/check rudder pedal steering prior to takeoff. We use the tiller for taxi and check rudder control deflection in the After Start checklist; but don't control nosewheel steering with rudder pedals until the takeoff roll. A check could be incorporated to test this function after heavy maintenance has been performed or prior to test flights when work has been performed on the rudder system.