Articles by Joe Marchese

Ice Breaker: Determining an Oil Charge

The required oil charge for a system is basically a factor of the amount of refrigerant in the system and the compressor’s oil pumping rate. The most common method of determining if oil needs to be added to a compressor is to observe the compressor’s oil sight glass. But what if the compressor doesn’t have an oil sight glass?
Read More

Ice Breaker: Technician Certification

Certifications offer many benefits to a technician. First, taking a certification exam demonstrates that a technician is serious about his trade and, more importantly, if passed, that he has achieved a high level of expertise. Certifications can also be used as a self-check to identify areas of weakness or strength.
Read More

Ice Breaker: Multiple Evacuations

One contaminant that must be removed from a refrigeration system before refrigerant can be added is water vapor. If water vapor is left trapped in a system, it can lead to some serious problems. Technicians will typically reduce the system’s pressure to about 500 microns to remove this water vapor.
Read More

Ice Breaker: Don't Be Afraid to Ask Why

There are several ways we can get answers to our questions. The easiest way is to just ask someone who has more experience with the system or component. However, if an answer does not make sense or is unclear, we should not just simply accept it as fact, but should ask it again or ask “why.”
Read More

Ice Breaker: Testing Thermistors

Thermistors are one type of temperature sensor used on electronic control systems. Technicians servicing these control systems need to be able to test the operation and accuracy of these sensors. A defective thermistor can easily cause a controller to not operate correctly.
Read More

Ice Breaker: Talking Oil Separators

An oil separator is an accessory used on some larger refrigeration systems to help limit the amount of oil in circulation. It is typically used on low temperature applications where the refrigerant’s mass flow rate is low. But it could be used on any system.
Read More

Ice Breaker: First Steps of Service Calls

Troubleshooting a refrigeration system is all about gathering information and using that information to determine the cause of a problem. Technicians are always measuring voltages, amperages, pressures, and various temperatures to help them find a problem. Besides these important measurements, there are other pieces of information that can assist a technician.
Read More

Ice Breaker: Starting a Stuck Recip Compressor

One of the common problems found while troubleshooting reciprocating compressors is that they simply fail to start. This could be the result of many different causes, both electrical and mechanical. One common mechanical cause is a stuck piston. Mechanically the piston cannot overcome an internal resistance to move.
Read More

Multimedia

Videos

Image Galleries

2015 ACCA Conference

Images from the 2015 ACCA Conference in Grapevine, Texas. Posted on April 8, 2015.

Podcasts

NEWSMakers: Leslie McDowell

Leslie McDowell, director of communications at the Building Performance Institute Inc., discusses the nonprofit organization's new homeowner centric website. Posted on April 10.

More Podcasts

ACHRNEWS

NEWS 04-13-15 cover

2015 April 13

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Global Warming

Do you believe in man-made global warming?
View Results Poll Archive

HVACR INDUSTRY STORE

2015.jpg
2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research

 

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

DON'T MISS A THING

Magazine image
 
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.

STAY CONNECTED

facebook icontwitter iconyoutube iconLinkedIn i con