Articles by John Tomczyk

Distinguishing between a restricted liquid line and a system overcharge in a commercial refrigeration system is very important for service technicians.

There are varying types of symptoms that can occur when a refrigeration system has an overcharge of refrigerant.

Worn compressor rings and/or leaky compressor suction or discharge valves can cause a lack of cooling in refrigeration and air conditioning systems.

One important but often overlooked piece of equipment is the air filter, which protects the evaporator from dirt and lint.

Let’s look at how the density of refrigerant entering the compressor’s cylinders affects the mass flow rate of refrigerant through the compressor.

Long shutdowns can wreak havoc on refrigeration and air conditioning systems if certain steps are not taken.

Refrigeration and a/c compressors are vapor compressors, meaning they are designed to compress refrigerant vapor, not liquid refrigerant.

Technicians often confuse symptoms of a refrigeration system that has a frosted evaporator coil with a system that is overcharged with refrigerant.

In a refrigeration system, service technicians often confuse a liquid line restriction with an undercharge of refrigerant.

The compressor’s discharge temperature can tell the service technician what is going on inside a refrigeration or air conditioning system.