Figure 7: Schematic drawing – (YK) Compressor lubrication system
Oil heater
During long idle periods, the oil in the compressor oil reservoir tends to absorb as much refrigerant
as it can hold, depending upon the temperature of the oil and the pressure in the reservoir. As
the oil temperature is lowered, the amount of refrigerant absorbed increases. If the quantity
of refrigerant in the oil becomes excessive, violent oil foaming results as the pressure within
the system is lowered on starting. This foaming is caused by refrigerant boiling out of the oil as
Model YK (Style H), R-134a and R-513A20
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