All the units except the 20HP unit are modular. Each module has a tandem set of scroll compressors and two fans. The individual compressor amps are only around 32 amps. That is why the RLA and MCA are so close. On the largest unit the pump is the largest load at 40 amps. All of the heat trace for the water piping, the GFCI outlet and pumphouse service light are on a seperate generator back up service.
The small modular scroll compressor layout saves on start up amp draw and also gets around the requirement for a full time manager. Larger screw compressors and some recips require a full time manager under some city codes.
