York VSD 270 Operation Manual page 30

Figure 11: OptiSpeed system architecture (Model 1055 shown, similar to 868, 882, 914, 917,
and 948 models)
Callout Description
1 Filter pre-charge contactor
2 Air coil
3 Filter supply contactor
4 Line inductor
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Callout Description
5 Filter inductor
6 Line voltage isolation board
7 Circuit breaker
8 Filter trap
Liquid-Cooled OptiSpeed Compressor Speed Drive