If you do have another drive that can boot Windows 7, you can use the Disk Management tool to build a new system partition on your existing SATA drive. You have to shrink the existing partition, and create a new partition. Then you can copy the boot files to the new partition using bcdboot.
An APU is an auxiliary power unit. On-board APUs are small jet turboshaft engines that are started to provide electrical and hydraulic power to the aircraft when needed during periods when the engines aren't running. Some aircraft are designed...
FCU is fan coil unit which is intalled for samll capacities and have less options than AHU like no humidity control and no special options for heat recovery of air filters. AHU means Air Handling Units and are available in number of varities and tonnages from small upto large capacities.