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The concept of superheat
October 19, 2021
We illustrated the concept of superheat in last week's article by boiling water and superheating steam in a moonshine still. This week we will apply this concept to refrigerant in an air conditioning system. The still has been replaced with an evaporator.Read Article >
More on the behavioral characteristics of various compressors
October 12, 2021
Last week's article ended with a slide from my class at the MACS Training Event & Trade Show. If you haven't already read that article, you may want to do so. That slide had the following question in it: Finally, with a 30 to 32 PSI low side, why is the suction line temperature 65° FRead Article >
Behavioral characteristics of various compressor types pt. 2
October 5, 2021
So now it is time to provide the correct answer along with information on why it is correct and also information on why the others are incorrect.Read Article >
Transit bus cooling system overhaul
September 28, 2021
Upon inspecting the 300,000-mile bus, we found several concerns likely contributing to the engine’s overheating situationRead Article >
What to know before you go
September 23, 2021
MACS Registration Information MACS Registration is located near the Executive and Junior Ballrooms. To reach the registration desk between 8:30am-5pm via phone, please call the MACS office at (215) 631-7020 x 305. Leave your name, cell # & reason for your call. An onsite MACS staff will return your call.Read Article >
AEM Update: Snap application for off-highway R-1234yf
September 22, 2021
MACS will have a variety of heavy-duty and off-road presenters beginning at 8 am on Thursday, September 30. One will be AEM Update: Snap application for Off-highway R-1234yfRead Article >
Behavioral characteristics of various compressor types
September 21, 2021
When faced with a challenging A/C system problem, knowing what type of compressor you are dealing with can help streamline the diagnosis process.Read Article >
Komatsu and mining equipment A/C clinic
September 20, 2021
Attend the MACS 2021 Training Event and Trade Show heavy-duty and off-road program and you will learn about servicing Komatsu mining equipment.Read Article >
The cool kids ride air conditioned school buses
September 17, 2021
More and more school districts are requiring their school transport buses to be air conditioned. On blazing hot days, high in humidity, it is a matter of comfort for riders. In the era of COVID-19, filtration of the air is an important matter of safety.Read Article >
Cooling fan circuit analytics
September 16, 2021
What is Peter Orlando’s class Cooling Fan Circuit Analytics about? It all began decades ago as a mechanical fan attached to the water pump with and without a fan clutch. And now it has evolved into an efficient complex electrical motor control of cooling the modern internal combustion engine.Read Article >