Articles by John Tomczyk

HFO refrigerants are actually unsaturated HFC refrigerants and are widely recognized as the next generation of refrigerants because of their environmental friendliness, cost-effectiveness, and great energy efficiencies.

The main reason for pulling a vacuum on a system is to rid it of unwanted gases, mainly air and water vapor. 

Often, a simple control scheme using a microprocessor can allow manufacturers to use lower starting torque compressors without the use of a hard start kit to operate their ice machines. 

The function of an oil reservoir, commonly known as an oil trap, is to prevent large oil slugs from forming. This is accomplished by trapping a small amount of oil in the reservoir or trap and gradually returning it to the compressor.

All frost means is the suction line or compressor is below freezing, and the moisture in the air has reached its dew point temperature and condensed. 

Often, compressors in the refrigeration and air conditioning fields have forced oiling systems. Here is a look at some of those oil pumps.

An overview of the oil check valve, which will only let oil pass from the compressor’s motor barrel to its crankcase.

The compressor’s discharge line temperature is important because it is an indication of the amount of heat absorbed in the evaporator and suction line and any heat of compression generated by the compression process.

Migration of refrigerant to the compressor’s crankcase during an off cycle is a serious problem, as significant compressor damage can occur if the problem is not remedied. 

This column will try to explain the voltages associated with the high or wild leg coming from the secondary of a Delta service transformer.