Marstair has a large range of MCU+ condensing units available suitable for use with R407C. There are many systems still functioning on R22 refrigerant, however R22 refrigerant is no longer available for servicing this equipment. Many of these systems will need replacing due to their age but it is not always that simple. It is often very difficult to access the pipework on these old systems. R407C requires similar pipework so can be used to easily replace R22 condensing units whilst maintaining the existing pipework and evaporator if required.