Articles Tagged with ''The Professor''

In medium- and low-temperature refrigeration applications, 1 hp is hardly ever equal to 1 ton of refrigeration. Let’s review a few principles to illustrate this point.

Remember, when wiring motors for a certain voltage, the service technician must always refer to the motor manufacturer’s literature and numbering scheme before wiring the motor for the desired voltage or damage to the motor’s windings may occur.

Voltage unbalances exceeding more than 2 percent in three-phase systems can cause current unbalance among the windings. These voltage and current unbalances can cause an increase in winding temperature and an overheating problem that can be detrimental to the motor.

This article explores some of the new, state-of-the-art, digital, wireless technologies available for measuring system superheat and subcooling. These new tools enable technicians to automate measurements, share data, and save time and money

Bluetooth technology is a wireless standard that exchanges data wirelessly over short distances (100 meters) using radio wave frequency transmissions.

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. 

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