Dedicated Outdoor Air System Simplifies Specification for Small Spaces

The Reznor ZQYRA Series is a dedicated outdoor air system (DOAS) for adding outdoor air requirements in light commercial spaces.
The Reznor ZQYRA Series is a dedicated outdoor air system (DOAS) for adding outdoor air requirements in light commercial spaces.

Nortek Global HVAC LLC has introduced the Reznor ZQYRA Series, a dedicated outdoor air system (DOAS) for adding outdoor air requirements in educational, healthcare, office, retail and other light commercial spaces.

The patented ZQYRA–8 (500 to 1,100-CFM) and ZQYRA–12 (900 to 1,500-CFM) units combine control design with modulating heat pump and enthalpy wheel technology. They boast a small footprint and are ideal for adding outdoor air ventilation in smaller spaces for new and retrofit VRF or conventional DX air conditioning projects.

The Z-Series Selection software expedites specification as simply as selecting an off-the-shelf system because inputs require basic project parameter data. Combined with the proprietary software capabilities, specifiers now have a choice for ventilating small spaces with pinpoint temperature/humidity control.

The ZQYRA Series incorporates several control functions and components in its design:

  • Supplemental electric heat control uses an SCR time-proportioned modulation controller (zero to 100-percent control) for optimizing efficiency and pinpoint temperature control.
  • Extended heat pump operational time during low ambient temperatures to eliminate coil freezing and subsequent energy-intensive defrost modes.
  • Z-Series Selection software calculates unit performance expectations as per inputted CFMs and the facility’s geographical temperature/humidity ranges.
  • A refrigerant charge compensator that allows minimized and optimized refrigerant usage for both heating and cooling modes.

The ZQYRA Series surpasses the AHRI Standard 920 dehumidification efficiency minimum 5.2 ISMRE rating. Although both models are 3.5-tons, their silica gel enthalpy wheels’ dehumidification benefit equals that of a 7-ton air conditioner. The Series also surpasses minimum requirements for ASHRAE Standards 62.1, 90.1, 189.1 and LEED project mandates for 30-percent more ventilation air while using 30-percent less building energy.

Unlike large capacity DOAS systems with options that complicate the specification process, the ZQYRA design offers an approach with basic options. Specifiers need to choose MERV 8 or MERV 13 filtration; corrosion-resistant coil coatings for salt water locations; and activation control options ranging from CO2, occupancy, and VOC sensors, or a manual on/off override switch; power requirements of 208/230 or 460V power.

Other features of the ZQYRA Series are:

  • Functions as a stand-alone, self-contained DOAS or can be combined with packaged air conditioning systems for outdoor air supply and/or recover up to 80-percent exhaust air energy.
  • Reznor’s designs, such as pre-painted gloss-90 steel cabinets with double-wall insulation in the wet areas to minimize moisture harboring biological growth.
  • Compatibility with all Building Management Systems (BMS)
  • EC motor/direct drive fans
  • The heat pump heating mode offers a 56-percent energy savings.
  • The Z-Series Selection software data sheet is printable for client specification presentations.
  • Doesn’t require energy-inefficient defrost modes
  • Two-year all parts warranty

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