Tecumseh AH5540E Service Handbook page 104

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SERVICE HANDBOOK
FIGURE 6-10: Liquid refrigerant enters compressor
and settles to the bottom, below the
oil.
FIGURE 6-11: Five seconds after start-up, violent
foaming action fills sight glass as
refrigerant boils away taking the oil
charge with it.
FIGURE 6-12:
More than 60 seconds after start-up,
oil level is well below normal operating
levels - a condition that is an important
factor in compressor bearing wear.