HVAC

By Aaron Stotko

When a century-old Dallas railroad company headquarters required major renovations to transform into a Homewood Suites by Hilton, initial cost estimates for the hydronic heating system came in too high.

That’s when City Wide Mechanical of Dallas looked to alternative piping systems for a solution. They found PEX-a pipe with F1960 expansion connections to be the ideal system, due to its durability and ease of installation in addition to the job-site productivity, safety and, best of all, profitability potential it provided.

And City Wide Mechanical isn’t alone in their findings. Many mechanical contractors are discovering the benefits of PEX-a pipe and F1960 connections as the preferred alternative to copper, iron, and steel, which have dominated the mechanical piping industry for decades.

Benefits of PEX-a

PEX is an acronym for crosslinked polyethylene. It has been used in North America since the mid-1980s, starting with radiant floor heating systems, then moving into plumbing and, eventually, to hydronic hot-water heating and chilled-water applications.

PEX can be manufactured via three different processes, which create products with varying crosslinking percentages that allow for different characteristics. PEX-a is the most durable, flexible, and resilient with crosslinking around 85%. PEX-b is a stiffer piping product with crosslinking around 65% to 70%, and PEX-c features crosslinking around 70% to 75%.

ASHRAE Headquarters Grand Opening Fall 2021, photos by Devin Abellon

One major benefit of the higher crosslinking in PEX-a is its extreme flexibility along with its thermal and shape memory. The flexibility of PEX-a eliminates most connections in smaller-diameter piping, saving time and money with up to half the connections required in rigid metal piping systems. To make a change in direction, the installer simply bends the pipe instead of having to stop and make a fitting. There are also bend supports available that help hold a bend securely in place.

The thermal memory of PEX-a provides kink repairability with a simple shot of heat from a heat gun. This eliminates the need to add in a coupling if a kink ever occurs in the pipe. (It is important to note that kink repairability is not possible with PEX-b or PEX-c pipe.)

The shape memory of PEX-a allows the pipe to expand and contract back down to its original shape. This makes it extremely resilient in freezing conditions and also provides for the fastest, easiest, most reliable PEX-a fitting system — F1960 expansions.

Expansion fittings require one simple tool to expand the pipe and an expansion ring before inserting a fitting. As the pipe and expansion ring naturally shrink back to their original shape, it creates a strong, durable connection that holds tight and can never be dry-fit. (Note: It is not recommended to expand PEX-b or PEX-c pipe due to microcracking that can occur.)

The innovative expansion fitting method eliminates torches, glues, and solder from a job site for greater worker safety. Plus, the system is extremely easy for installers to learn, helping get new crews up to speed quickly.

Speaking of job-site safety, PEX is also much lighter in weight compared with metal systems. For example, a 300-foot coil of 1/2-inch PEX weighs about 18 pounds, whereas the same amount of copper pipe weighs around 85 pounds. The lighter weight of PEX makes it safer and easier for installers to move around a job site and also eliminates the need for heavy-lifting equipment.

PEX-a also has a long-term advantage over copper when it comes to performance longevity. It is a static system, meaning its internal surfaces — which are three times smoother than copper — will not pit, scale, or corrode. That means its performance will remain the same from day one through decades of use.

Finally, because it is not a traded commodity, PEX-a holds a relatively stable material cost. This makes bidding a project much more consistent and reliable.

Application Details and Installation Tips

PEX-a is regulated by the ASTM F876 standard, which denotes temperature and pressure ratings of 200°F at 80 psi (pounds per square inch), 180°F at 100 psi, and 73.4°F at 160 psi. These values are well within the range of operation for most hydronic systems, including chilled beams, fan coil units, baseboards, radiators, hydronic VAV (variable-air volume) reheat coils, and radiant manifolds.

Because PEX is oxygen-permeable, it is important to use a pipe with an oxygen barrier that limits oxygen diffusion to levels below DIN 4726. This will protect the metallic components in the mechanical piping system, such as valves, strainers, and pump volutes, from corrosion.

The pipe is manufactured in sizes from 5/16 inch up to 4 inches and features a copper tube size (CTS) outside diameter. This means all the off-the-shelf components used in a copper hydronic piping system — hangers, supports, and insulation — can be the same.

For horizontal piping, the industry offers PEX-a Pipe Support — a galvanized-steel channel that is 9 feet in length and available in PEX pipe sizes from ½ inch to 3½ inches. This solution enables hanger spacing similar to copper pipe and helps control the natural expansion and contraction of the pipe as it heats and cools.

Because PEX-a expands at 1.1 inches per 100 feet per 10°F Delta T (which is 10 times that of copper), installing anchors every 65 feet and using PEX-a Pipe Supports allows PEX-a to function much like a copper system. In fact, different installation methods have a different effect on the overall net expansion rate.

With a strut-and-clamp system, using PEX-a Pipe Supports and anchoring with fixed points reduces the expansion rate of PEX-a to 0.08 inches per 100 feet per 10°F Delta T (a rate less than copper). And a loop-and-clevis system can reduce the rate to 0.12 inches per 100 feet per 10°F Delta T.

If you’d like to learn more about PEX-a piping systems, visit the Plastics Pipe Institute at plasticpipe.org or the Plastic Pipe and Fittings Association at ppfahome.org.

Aaron Stotko is the director of Segment Marketing at Uponor. He can be reached at aaron.stotko@uponor.com.

Scholarships awarded to children, grandchildren and employees of Carrier and Bryant distributors and contractors nationwide

Carrier and Bryant have announced the recipients of this year’s Carrier & Bryant Distributors’ Education Foundation scholarships. Recipients will receive funding for their post-secondary or vocational program during the 2022-2023 school year. Carrier and Bryant are part of Carrier Global Corporation (NYSE: CARR), the leading global provider of healthy, safe, sustainable and intelligent building and cold chain solutions.

Established in 1981 the Carrier & Bryant Distributors’ Education Foundation was created to commemorate the late William A. Blees for his many years of service as an advisor to Carrier and Bryant distributors. Since inception, the foundation has awarded scholarships to over 400 students. Today, the foundation continues to serve the children, grandchildren and employees of distributors and contractors while also honoring the industry’s founder, Willis Carrier.

Willis Carrier attended Cornell University on a full, four-year merit scholarship. He earned a bachelor’s degree in electrical engineering, became a successful inventor and businessperson, and, in 1902, invented the founding principles of modern air conditioning. Willis Carrier was a consummate scientist and an educator who attended college on scholarship, just as our recipients will in his honor.

“The Carrier & Bryant Distributors’ Education Foundation scholarships are a special way for us to say ‘thank you’ to our contractors and distributors for their expertise and support,” said Justin Keppy, President, NA Residential & Light Commercial HVAC, Carrier. “This year’s outstanding scholarship recipients embody all of the values and characteristics we look for in future leaders, and we’re proud to support their educational endeavors just as Willis Carrier was supported in his.”

Scholarships from the foundation are available to children, grandchildren and employees of Carrier and Bryant distributors and contractors and their employees throughout the U.S. Students are awarded the scholarship based on academic achievement, extracurricular activities, demonstrated leadership potential, and personal motivation. A short essay about the candidates’ educational and career aspirations is required during the application process. There were 119 total applicants from 27 states for this year’s scholarships.

The 2022 Carrier & Bryant Distributors’ Education Foundation scholarship recipients include:

For more information about Carrier or Bryant, please visit https://www.carrier.com/residential/en/us/ or www.bryant.com.

Name: Matthew Fleming
Title: Owner
Company: All-Star Plumbing & Heating
Location: Manasquan, New Jersey
Specialty: New Construction Large Custom Homes

Although a self-described “rough around the edges” kind of guy, Matthew Fleming (@allstarplumbinginc), owner of All-Star Plumbing & Heating, Manasquan, N.J., admits he’s a girl dad, and he wouldn’t have it any other way. “I have no problems laying on the floor and playing dolls with my daughters,” says Fleming. He says that at some point you have to be able to shut OFF work and turn ON home.

And while spare time doesn’t happen as often as Fleming would like, when it does, he loves hanging at the beach with his wife and kids. He also tries to make time to work out at the gym every morning to clear his head and start the day right. “Work will always be there tomorrow so you need to make sure that you’re not missing those important life/leisure moments that you can’t get back.”

It’s a Generational Thing

With Fleming’s father owning a family plumbing business, it was a simple decision to get into the plumbing industry. Fleming went to college for business administration and construction management to at least give himself a solid base of business knowledge if he was to ever take over the company. A solid decision as it turns out. “I started plumbing when I was about 16 years old but would always help out my dad as a kid. I worked part time through school and college. Once I graduated college, I jumped in full time and I’ve never looked back,” says Fleming.

The Ultimate Influence

Fleming has recently officially taken over the company that his father started 30+ years ago. And it was his father that molded Fleming into the craftsman that he is today. “He instilled in me the values of hard work and determination,” says Fleming. “He was always pushing the envelope and would take on jobs that other plumbers and companies would shy away from. My father always embraced challenges, and after years of doing that, it became clear the you can attack difficult situations with the confidence and mindset that you have what it takes to handle it.”

Like most modest tradespeople, Fleming doesn’t consider himself a “role model” but he does feel like he has some valuable bits of advice he could pass on to the younger generation looking to get into this trade or take into whatever field they choose. “A lot of plumbing is having the ability to problem solve, and that applies to any field. I encourage people to never be content with their current knowledge and skill set, you can always find ways to improve,” says Fleming.

These days a lot of teaching and connecting with others happens through social influencing. “Social media has absolutely made a big impact on my business for multiple reasons. I’ve learned so much from so many of the incredible plumbers across the country and have made some good friends, too. I’ve gotten jobs from the work people have seen on my Instagram, but above that, seeing the amazing work that others put out makes me improve my own work. I always remind the guys that I might take a picture of their work and post it to Instagram for public ridicule by the “super plumbers,” so make sure it’s right, haha,” says Fleming. “Social media can be very valuable if you use it right, and the plumbing community is second to none on there.”

State of the Industry

“I feel like most people believe that being in the trades means that you’re a second-rate citizen and couldn’t get a “real” job,” says Flaming. When in reality, continues Fleming, it’s a respectable occupation that requires highly educated, hard-working people. And with that comes training. “There should be more educational and training options available so that people entering the trades can be trained properly, which will help raise industry standards. Increasing trade school funding to ensure that the programs available are legit programs would absolutely attract more people. They need to be proactive in recruiting instead of just waiting for kids to show up,” says Fleming.

A Hard Day’s Work

One of the most rewarding things about his work is the problem-solving aspect. “I really enjoy when the customer tells me that they had four other companies there prior and nobody could figure out the problem but we did,” says Fleming. I’d say that’s a win.

But nothing compares to when you are down and come home to see those smiling faces.  “I was having a pretty rough week, put through the ringer. I came home that day feeling pretty defeated only to be greeted by my two daughters—ages 6 and 8—barreling towards me to give me a huge hug as my wife kissed me on the cheek. Instantly, I was reminded of what is really important, and even though I was having a rough patch, I was still doing a good job. It was just what I needed and I thought to myself, ‘I’m extremely lucky to have this life that plumbing has provided me.’”

LG’s ‘On Demand’ Library and Distance Learning Opportunities Reinforce Company’s Commitment to Industry-Wide Education

LG Air Conditioning Technologies has extended its LG Connections Virtual Speaker Series. This dynamic series of monthly webinars provide architects, contractors, engineers, and professionals with ongoing education opportunities, product and innovation updates, design and service tools, and industry insights.

The series explores various topics focused on profitable strategies for enhanced building design and performance, comfort, and control while offering participants the opportunity to connect with LG’s team of experts. LG Connections webinars are presented on the last Wednesday of each month at noon EDT and include a 45-minute presentation followed by 15 minutes of Q&A. Additionally, the company offers an On Demand Library for access to a range of content and speaker presentations, which is available here.

“LG remains steadfast in our commitment to the training and advancement of architects, engineers, contractors, building owners – anyone in the project chain,” said Steve Scarbrough, senior vice president and head of LG Air Conditioning Technologies USA. “What was first launched during the height of the pandemic as a remote learning resource has evolved into an ongoing educational opportunity for the AEC (architects, engineers and consultants) community. This extended LG Connections webinar series is another tool within our comprehensive education arsenal that gives learners nationwide the ingredients to understand and apply new air conditioning technologies to an array of projects – from residential to commercial.”

Since late 2019, LG has significantly enhanced its educational resources for project professionals, with distance learning being a key component of its overall training strategy. As a result, according to Scarbrough, webinar participants can expect to receive inspiring content and tools for differentiation that they can leverage now and during the economic recovery.

Details for upcoming webinars (12 noon – 1:00 PM EDT):

• Wednesday, July 27 – Designing HVAC Systems with LATS Revit
• Wednesday, August 31 – A Closer Look at the LG Inverter Scroll Heat Pump Chiller

LG invites design and construction professionals to mark their calendars on the last Wednesday of every month at noon EDT for the LG Connections Virtual Speaker Series. Upcoming Connections webinars and registration links are shared regularly on the company’s LinkedIn. For more information about LG Air Conditioning Technologies, visit lghvac.com.