This Help Center article will show you the necessary steps to turn a Voyager III unit ordered as multi-zone variable air volume (VAV) to single zone variable air volume (SZVAV). This is not a difficult modification and the hardest part should be obtaining the 7 pin connector for the RTOM. There is a PDF download below, but if you have trouble then an Image is below on the steps.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.