“It’s common to simply replace, but there’s a lot of potential benefit to upgrading,” he said.

McKissack added that, not surprisingly, there are substantially more capabilities and options now. He also pointed out a less frequently considered factor: Loads for these buildings may even have the same square footage as when the original unit was installed, but their loads have often shifted considerably as owners and spaces have changed.

These trends contributed to the company’s effort in making the R7DA powerful but still configurable. And because mechanical space may not have changed much, if at all, in the years leading up to a new purchase, the R7DA was designed to arrive with a small footprint. Its compatibility with many existing RTU brand curbs can let owners dodge an extra expense by avoiding re-roofing costs for retrofits.

The R7DA, which is available in 6 and 7.5 tons, complements the R7 Platform’s existing R7TQ package space conditioning (only) unit that’s available from 6 to 12.5 tons. The product line will be expanded to 20 tons in 2019.

The R7DA features a thermostat interface and a direct digital control (DDC) controller that provide pinpoint control by modulating electronically commutated motor (ECM) supply fans, air-cooled DX, and gas heat. The DDC controller also uses proprietary algorithms to facilitate Nortek’s newly-patented method of modulating hot gas reheat circuits that eliminates inefficient evaporator freezing challenges common among all DOAS brands operating in cold weather.

As for that configurability, its field-convertible design can adapt to existing horizontal or vertical supply air discharge and return air without incurring the design costs of custom equipment. In addition, electrical and gas piping inlets are possible through the curb or unit.

A few other features include a corrosion-proof drain pan, optional coil coatings, and airflow sensors monitoring static pressure.

Elsewhere in the Nortek universe, David Street is the vice president of engineering and product management, Nortek Global HVAC.

“Innovation in the residential market is being heavily driven by regulatory compliance,” he said. “In the commercial market, there will be replacement demand in buildings less than 50,000 square feet. Our focus is building products that are energy efficient and easy to install.”

One response that can conceivably fit in any or all of those situations is ductless HVAC. So in addition to the R7DA, this year’s attendees could check out a model from the manufacturer’s recently redesigned split-system jacket line.

Models showcasing two additional new designs (launching in 2019), a model from the company’s unit heater line, and a brand-new 96 percent AFUE gas furnace for use in manufactured housing applications also shared space at the booth.

Happening miles away from the show but nevertheless a proud part of the company’s very recent history: Nortek Air Solutions LLC announced that its StatePoint™ liquid cooling technology was chosen for a new, state-of-the-art Facebook data center. For Facebook, the facility is the first engineered by the company and located in Asia.

The StatePoint system uses a liquid-to-air exchanger in which water evaporates through a membrane separation layer to cool the data center. The liquid-to-air membrane exchanger prevents cross contamination between the water and airstreams. With the addition of a pre-cooling coil, the system can maintain required cooling water and temperatures in humid climates (a box Singapore checks easily) while using minimal supplemental mechanical cooling.

Liquid-cooled data centers seem a long way — geographically and technologically — from the company’s origins a century ago. Founded as the International Oil Heating Co. in 1919, the company rose to success manufacturing coal-to-oil conversion furnace burners. The innovative oil burners helped reduce coal-burning air pollution challenges faced in its St. Louis hometown, which was considered the dirtiest city in the Mississippi Valley at the time.

Later, the company innovated even cleaner gas-fired burner conversions. Decades after that, the family of companies continues working to break new ground, whether by delivering new features on nearby rooftops or serving servers across the world.

Publication date: 2/18/2019

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