York VSD 270 Operation Manual page 31

Figure 12: OptiSpeed system architecture (Model 1055 shown, similar to 868, 882, 914, 917,
and 948 models)
Callout Description
1 Filter power unit
2 Service hole
3 SCR trigger board
4 Drive power unit
5 Filter input current transformer
In Figure 12, the drive and filter logic boards are mounted on the right door.
Liquid-Cooled OptiSpeed Compressor Speed Drive 31