From the church history web page:
UCF’s pipe organ was built in 1871 by William A. Johnson of Westfield, MA, and his son, William H. Johnson. The original pipes used a mechanical linkage, or ‘tracker action’, to open the valves, allowing air to flow in the pipes and create sound. After the collapse of the sanctuary floor in 1957, the organ was installed in its current location in the rear balcony and rebuilt by Chester A. Raymond of Princeton, N.J., in 1959. At this time, the pipes were upgraded to a pneumatic mechanism, which uses compressed air to control the valves.

The organ has undergone several renovations since 1959, including a console replacement in 1989. The current console consists of three keyboard manuals and 27 ranks of pipes plus, three 16’ extensions and chimes. The Great division was repositioned by Kerner and Merchant Pipe Organ Builders, Ltd., in 1994, and was renovated in 2004. UCF’s organ is mentioned in the book, The Johnson Organs: The Story of One of Our Famous American Organ Builders, by John Van Varick Elsworth and edited by Donald R. M. Paterson.

Was Presbyterian. Electrified and enlarged by Chester Raymond c. 1960.