York R-410A, Technical & Service Manual, Page: 12 / 385

General information
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(5) Advanced oil return technology.
Combining the electronic control and the mechanical control, the oil level controller
keeps appropriate oil level in the compressor crankcase. Equipped with oil balance pipe and
low-pressure accumulator, it is applicable to both low-pressure & high-pressure oil cycling
system. Besides, with the innovative design of one-way valve and capillary, the system can
meet the continual oil level change of digital compressor and protect the compressor in whole
hog. The digital Scroll Compressor is in the state of loading or unloading. In the loading state,
the full speed operation of the compressor motor ensures the refrigerant has enough power to
bring the oil back to the compressor. In the unloading state, there is no oil moving out of since
there is no refrigerant output, the inertia of the refrigerant can also bring some oil back to the
compressor.
(6) Space saving