John Tomczyk

Liquid line restrictions cause the evaporator, compressor, and condenser to be starved of refrigerant, causing performance problems in refrigeration systems.

An evaporator can be cold but inactive, causing warm refrigerated space temperatures.

The condenser is the most underrated component in an air conditioning or refrigeration system.

Even though the circulated refrigerant is the working fluid required for cooling, lubricant or oil is needed for lubrication of the compressor’s moving mechanical parts.

The evaporator is one of the major components of any refrigeration or air conditioning system.

What happens in the condenser is a direct reflection of what is happening in the rest of the refrigeration system.

Inexperienced service technicians have a tendency to add refrigerant to a troubled system in order to remedy a problem. Because of this, many systems are operating with an overcharge of refrigerant.

Before servicing any refrigeration or air conditioning systems that contain an oil pump, technicians should make sure they understand the difference between net oil pressure and oil pump discharge pressure.

Service technicians should always remember that systematic troubleshooting is the only sure way to find the actual cause of any system problem.

Any compressor that gets too hot or is overheated is subject to premature wear between its internal moving parts.