Articles Tagged with ''variable-speed technology''

Tecumseh president and CEO, Doug Murdock, says the company is “back in the game” thanks to investments it has made and continues to make in its core products: fractional horsepower compressors.

Designed for water-cooled chiller applications and built with Turbocor technology, the TT700 compressors are oil-free, variable-speed, magnetic-bearing centrifugal compressors that provide full- and part-load energy efficiency.

The Design Envelope Vertical-In-Line Retrofit allows building owners to replace the moving parts of an installed Armstrong constant speed pump while retaining the existing pump casing, insulation, and piping. 

Variable-speed blowers on indoor units can enhance the comfort and efficiency of residential HVAC systems, but most homeowner customers won’t be aware of those benefits unless you explain them. A few minutes spent educating homeowners about the advantages of variable-speed equipment and how the technology actually works could help you sell an upgrade and create a happier customer.   

Kevin O’Neill, owner of O’Neill Cooling and Heating in Myrtle Beach, South Carolina, is a fan of variable-speed blowers on indoor units because of the enhanced dehumidification capabilities they provide. He said he includes a variable-speed indoor unit on the majority of the systems he sells.

“When a traditional air conditioning system starts up, the outdoor unit and indoor unit both come on full blast,” O’Neill pointed out. “The problem is, the indoor coil doesn’t get cold immediately; it can take as long as 15 minutes to reach maximum coldness. So, if you have a slightly oversized system, or if you’re in the shoulder months of spring and fall, the coil in a traditional system doesn’t really get cold enough to  dehumidify for at least five minutes and sometimes as long as 15 minutes.

“When a system with a variable-speed indoor blower initiates, the outdoor unit kicks on, but the indoor fan starts at only 50 percent of airflow,” he continued. “That allows the indoor coil to get much colder sooner, and it will typically reach maximum coldness in a minute or less. That allows the system to do a much better job of dehumidification, which is important in this climate.”

O’Neill said he educates his customers on the dehumidification advantages of variable-speed performance by using the classic “condensation on a glass” example.

“If you take a glass of water from your cold water tap and set it outside on a hot and humid day, it’s going to sweat,” he said. “If you take a glass of water from your refrigerator and set it outside on a hot, humid day, it’s going to sweat more because it’s colder. If you take ice cubes and put them in that glass, it’s going to be colder still, and it’s going to sweat even more. The message to customers is, the colder the coil, the more humidity it takes out of the air, and the faster it gets cold, the better. That’s how variable-speed technology helps an air conditioner.”

THREE KEY FEATURES

Dan Jape, owner and CEO of Reliable Heating & Air in Kennesaw, Georgia, said variable-speed indoor blowers are included on about 85 percent of the units his company sells. 

“No matter what condenser you match with a variable-speed furnace, you get the best comfort and a fast payback,” he said. “We usually work on the furnace selection first and then move onto the condenser we want to pair it with.”

According to Jape, there are three key selling features he utilizes to sell variable-speed equipment: energy cost savings, comfort, and humidity control. He said to run a variable-speed electronically commutated motor (ECM) or a variable-speed dc motor costs about $30 per year in Atlanta, compared to about $300 per year for a permanent split capacitor (PSC) motor.

“The first thing we discuss with customers is energy savings. Then, we explain how this upgrade will make them more comfortable,” he said.

By running slower and longer, variable-speed furnaces provide outstanding comfort, said Jape.

“Everybody has had the experience of a furnace heating up the air quickly, yet still being uncomfortable because the items in the home — the walls, floors, and furniture — aren’t warm. By running slower and longer on low speed, a variable-speed system may take a longer time to heat the air, but it does a better job of creating radiant heat from the objects in the room that make you feel more comfortable.

The third selling point — the ability to program a humidity set point with a variable-speed unit — may be the most important, said Jape, especially in Atlanta.

“In this market, we have days when you can just wring the water out of the air, so we appreciate enhanced dehumidification,” Jape said. “Most of the time, when our customers hear ‘enhanced dehumidification,’ they’re sold. So, between the humidity control, better comfort, and the fact that the variable-speed upgrade pays for itself in just a few years of electrical savings, it’s a pretty easy sell.”

After customers have been sold on the benefits of a variable-speed indoor unit, Jape said contractors should emphasize how these benefits will multiply when paired with the correct, appropriately sized outdoor condensing unit.

“Even if you’re pairing the variable-speed indoor unit with a basic 14-SEER outdoor unit, you can normally get an equivalent rating of 1- to 1.5-SEER points higher than the standard rating on that condenser because you’re dramatically reducing the energy consumption of the blower,” he said.

BELIEF MAKES THE SALE

At Atlas Butler Heating & Cooling in Columbus, Ohio, it’s the comfort advisors’ belief in the benefits of variable-speed that helps the company make the sale. According to Jeff Starkey, vice president of residential sales operations, about 60 percent of the units the company sells are equipped with variable speed indoor blowers.

“All of our comfort advisors are well-educated on the benefits of variable-speed products, and they truly believe in them,” Starkey told The NEWS. “Believing in a product has a huge impact. If they believe, their confidence will spill over with the customer, and the customer will know this is the right thing to do.”

Starkey said Atlas Butler’s comfort advisors educate customers on the comfort, energy-efficiency, and humidity-control benefits of variable-speed equipment. Columbus has a relatively short cooling and dehumidification season and a longer heating season. That means comfort is the main selling point, followed by energy efficiency.

“We talk about how the efficiency kicks up with a variable-speed product, but it really comes down to our ability to communicate how variable-speed technology can help improve their comfort levels,” Starkey said.

He added that once customers understand the benefits, the majority agree that variable speed is the way to go.

“It’s an education rather than a selling process,” Starkey noted. “I tell all my salespeople, ‘At the end of the day, you’re not a salesperson. You’re there to educate people about what’s out there, give them their options, and let them take it from there.’ Our salespeople are educated and enthusiastic about the benefits of variable speed. If a salesperson truly believes that an entry-level unit is the best option for customers, that’s all that salesperson will ever sell. But, if your salespeople truly believe in the many benefits that variable speed offers, they’ll communicate that, and the customers will believe it, too.”

Publication date: 12/5/2016

A look at some of the latest motor and drive products now available on the market.

Geothermal heat pumps (GHPs) have been around for a long time, but recent technological advances have propelled these systems into a new sphere of efficiency and comfort.

The Carel HEOS Sistema is a high-efficiency solution for refrigerated cases. It features remote cases fitted with variable-speed BLDC compressors cooled by a water loop. Each case can adapt its operating pressure to the load conditions in real time, allowing the compressor to operate in the most energy-advantageous conditions.