Articles by Joe Marchese

Ice Breaker: Refrigerant Numbering System Explained

There are many different types of refrigerant used in our industry today. They are produced by several different manufacturers and have numerous ways of identification. One proper method of identification is referring to a refrigerant by its ANSI/ASHRAE designation.
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Ice Breaker: Evacuation Speed Up

Evacuating a refrigeration system can be a very time-consuming task. There are several factors that influence the speed of this process. A technician has no control over many of these factors, but there are some areas in which he can help speed up the process.
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Ice Breaker: PTC Starting Relays

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.

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Ice Breaker: Taking Stock of Downtime

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.
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Ice Breaker: Thinking Outside the Box

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.
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Ice Breaker: Condensate Drain Lines

Technicians servicing refrigeration systems need to be knowledgeable in several different trades, one of which is plumbing.
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Ice Breaker: Servicing Special Systems

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.
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Ice Breaker: Simplifying Component Wiring

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.
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Ice Breaker: Liquid ‘Push-Pull' Recovery Method

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.
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Ice Breaker: The Hopscotch 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.
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NEWSMakers: Chris Mathis

Chris Mathis, president of Mathis Consulting Co. and vice chair of ASHRAE’s residential ad hoc committee, talks about ASHRAE’s exploration into the residential market. Posted on Oct. 17.

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EFFICIENCY STANDARDS

DOE has denied AHRI’s petition for reconsideration of walk-in standards. Is it getting harder to reach consensus on efficiency standards?
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