Crankcase heaters:

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The Crankcase Heaters

When compressor idle, lubricating oil may contain a certain amount of dissolved refrigerant depending on the pressure, temperature, and the refrigerant itself. At the time of launch oil this will darken the refrigerant and as the suction pressure falls, gas will boil out of the oil, causing it to foam. To reduce this decision of the refrigerant in the oil until an acceptable factor, heating devices usually come with Carter, and will remain in operation whenever the compressor is in stand-by mode.
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