As found in the above mentioned list A and B, the compressor and the main motor are protected from dangerous lubricating condition, low oil supply pressure or high oil supply temperature, by being shut down and as for the rest less dangerous but undesirable condition, those instruments have alarm system activated and emitted alarm signal to draw operators attention to take necessary action for the matter.
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Oil heater is installed at in the end of oil tank. Its heating element and temperature sense element are inserted in to the oil tank and immersed in oil. Oil heater is activate by its thermostats when oil temperature in the oil tank lowers below 20 ๐ C