Articles by Joe Marchese

Ice Breaker: Reducing Flash Gas

By Joe Marchese
No Comments
Less flash gas equals a higher net refrigerating effect and a more efficient system. Many designers reduce the amount of flash gas by additionally subcooling the liquid refrigerant entering the metering device. This lowers the refrigerant temperature; meaning less refrigerant will flash off to cool itself down to the evaporating temperature.
Read More

Ice Breaker: Working Safely With Circuits

By Joe Marchese
No Comments
Working safely should be a technician’s No. 1 priority; especially while working around electrical circuits and devices. Electricity is a powerful force that could kill or cause severe harm if mishandled. A technician must always be aware of this potential hazard.
Read More

Ice Breaker: Non-Refillable Refrigerant Cylinders

By Joe Marchese
No Comments
Refrigeration technicians carry refrigerant in non-refillable cylinders on their service vehicles every day. While these cylinders are considered relatively safe, there are some hazards associated with transportation and storage, and when removing refrigerant. Mishandling or improper use can lead to injury and/or property damage.
Read More

Ice Breaker: Determining an Oil Charge

By Joe Marchese
No Comments
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: The Making of a Refrigeration Technician

By Joe Marchese
No Comments
Servicing and maintaining refrigeration systems requires a technician with a unique set of skills. Not only must a technician be proficient in the refrigerant cycle and all of its components, they also must be knowledgeable in many other trades.
Read More

Ice Breaker: Technician Certification

By Joe Marchese
No Comments
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

By Joe Marchese
No Comments
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

By Joe Marchese
No Comments
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

By Joe Marchese
One Comment
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

By Joe Marchese
No Comments
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

Multimedia

Videos

Image Galleries

2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.

Podcasts

NEWSMakers: Jeremy Begley

Jeremy Begley, home-performance specialist and Web and social media manager with National Heating and Air Conditioning Co. in Cincinnati discusses how and why you should add home-performance philosophies to your contracting repertoire. Posted on Sept. 12.

More Podcasts

ACHRNEWS

NEWS 09-15-14 cover

2014 September 15

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Venting R-22

The NEWS reported that a man received prison time for venting R-22. Should EPA step up enforcement?
View Results Poll Archive

HVACR INDUSTRY STORE

plumbing-hvac.gif
2014 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