Coils for capacity regulator

When configuring a compressor HS.64 .. 74 or OS.74, the "coils for capacity regulator" (standard scope of delivery) may be excluded: The control pistons then operate as start unloading, which is suitable for frequency inverter operation.

All other compressors (i.e. all compressors with slider regulation as well as HS.53) need the coils for start unloading and starting – with or without frequency inverter operation (Recommended start and stop sequences).