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Small Units for Distributed Air Conditioning

Some applications take a distributed approach to air conditioning—instead of one large central unit, they call for multiple small units. The Heat-X-Changer® featured here is one of fourteen 100% outdoor make-up air, dehumidification, roof-top units built for a middle school in the Carolinas. They ranged in capacity from 725 cfm, 4 tons cooling, and 14 kW heating to 2,000 cfm, 12 tons cooling, and 36 kW heating. They were all supplied with a complete DX cooling circuit and a Model XLT™ flat plate heat exchanger for dehumidification and reheat. Combined with electric resistance heaters, each is a complete, highly-efficient, year-round, total air conditioning solution.

Performance Specification

  • Model: DXH–20–24–RT–CD–HE
  • Air Volume: 1,500 cfm
  • Built: May, 2006
  • Weight: 2,000 lbs
  • Energy Recovered: 28 MBH (Reheat)
  • Design Conditions: 10 °F / 100% RH (Winter), 92 °F / 46% RH (Summer)

Unit Features

  • A Model XLT–20F–24 Aluminum Flat Plate Exchanger provides 28 MBH cooling reheat.
  • This unit has an enamel coated, 18ga, galvannealed steel exterior and a 20ga, galvanized, double wall interior with 2” PolyISO insulation. The cabinet is mounted on a welded
    structural steel base frame with integral lifting lugs.
  • Outdoor/roof-top construction includes a sloped roof with capped seams, rain gutters, and screened intake hoods.
  • The blower is a belt driven FC-DWDI fan driven by a 2 hp, NEMA frame, ODP, Premium Efficiency motor all mounted on an RIS isolated frame.
  • The electrical system includes single point power disconnect, starters with overloads, and fused branch circuits with temperature controls provided by others.
  • Outdoor air intakes include shut-off damper with actuator and 2” 30/30 filters.
  • Heat: 25 kW Electric Resistance Heater—Cooling: 6-Row DX Coil and 6 Ton Compressor

The XeteX unit featured on this page was built for an actual application. It is provided here to show our capability.

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