One type of starting relay used on fractional horsepower compressors is the positive temperature coefficient (PTC) relay. It performs the same function as a current relay or potential relay but in a much different manner.
During the normal course of servicing and installing refrigeration systems, there are times when a technician will need to wait before proceeding to the next task. These downtimes do not need to be wasted time.
Repairing refrigeration and air conditioning systems is not always an easy task. Occasionally technicians will encounter multiple problems on one system. If all of these problems are not initially discovered and resolved, the unresolved ones could lead to problems and more costly repairs.
Our industry has many different types of specialized refrigeration and air conditioning systems. Servicing and maintaining these systems normally requires a higher level of expertise than generic systems. Depending on the application, these systems can operate quite differently from generic systems.
To prevent miswiring, any
time you need to replace an electrical component, draw a picture of the
wiring connected to the component. Draw the picture so each of the individual
wires are identified and shown exactly how they are landed on the component.
There are several methods that can be used to recover refrigerant from a system. The most common is the vapor recovery method. A faster method of recovering refrigerant is to remove the refrigerant in its liquid form. One method of recovering liquid refrigerant is the “push-pull” method.
Many system problems encountered by technicians are electrical in nature. Either the problem is an electrical defect, such as a defective switch or motor, or it can be traced electrically to the system problem itself, such as an open low-pressure switch as a result of a low system charge. In order to be proficient in troubleshooting a system problem, a technician must be able to efficiently troubleshoot the electrical components of a system.
Many of the systems and replacement components used in our industry will come with some type of literature supplied by the manufacturer. This literature will usually contain useful information for a technician and it should not be tossed aside.
Working with refrigerant recovery cylinders is a basic part of servicing refrigeration systems. Technicians need to work safely when handling these cylinders.