A new line of dedicated outside air systems (DOAS) from the YORK brand of Johnson Controls, includes a range of 100 percent outside air units and mixed air units that provide users with more options and greater application flexibility. With heat pump operation and water source operation, as well as a hot water heat option, the new line of air systems delivers more combinations of heating and cooling than before. The systems also feature an internal energy recovery wheel that pre-conditions outside air and reduces heating and cooling loads by transferring energy between the exhaust airstreams.
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“Handling up to 20,000 cfm of air and providing as much as 70 tons of cooling capacity, the new YORK DOAS meets ASHRAE requirements for fresh air and energy efficiency, and addresses the needs of building owners and consulting engineers,” said John Tuleya, product manager, Applied DX products at Johnson Controls. “The system controls supply air to room neutral, ensures precise unit cfm delivery, and continuously conditions up to 100 percent of outside air. It also features an energy recovery wheel for greater energy efficiency.”
The new DOAS line offers air or water cooled units, in various configurations ranging from cooling only to heat pump. A full selection of factory-installed options adds to system flexibility, including:
<li>Modulating or staged gas heat, modulating electric heat or hydronic heat options to meet outside air heating requirements</li>
<li>Six row evaporator coil for maximum capacity and moisture removal</li>
<li>On/off or modulating hot gas reheat to condition air to a neutral discharge temperature and accurate humidity control</li>
<li>BAS connectivity, thanks to the native BACnet control system, which has been designed specifically for integration with multiple BAS via BACnet, Modbus, Lonworks and N2 protocols.</li>
Often paired with another heating, ventilation and air-conditioning (HVAC) system, a YORK DOAS can operate in combination with a separate sensible cooling system for a bundled solution that satisfies the entire building load, sensible and latent. Paired system options include rooftop and self-contained units, chillers, water-source heat pumps, variable-air volume terminals and variable refrigerant flow systems.
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