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Dedicated Outside Air Systems

Dedicated Outside Air Systems (DOAS)

Tranquility® Dedicated Outdoor Air Systems (TOH/R) Horizontal


ClimateMaster Dedicated Outdoor Air Systems (TOH/R) Series provides the most complete solution for your water-source application. Our many options & configurations allow the design for outdoor air requirements to be incorporated into the water loop system, further enhancing the advantages of a WSHP application. The ability to precisely control leaving air dew point temperature in summer, handle extremely cold entering air temperatures in winter, & perform at part load conditions give designers unmatched flexibility in building design, Indoor Air Quality (IAQ) & energy efficiency.

Precise Leaving Air Temperature Control

  • Air temperature leaving dehumidifier controlled to ±0.2°F (±0.1°C)
  • Substantial energy savings
  • Conditioned outdoor air can be introduced directly into space

Evaporator Coil

  • Raised lance fins, rifled tubes maximize moisture removal
  • Very high MRE’s (Moisture Removal Efficiency)

Drain Pan

  • Stainless steel pan minimizes corrosion

Refrigerant Reheat Coil

  • Sized for neutral LAT (65 – 80°F, 18 – 27°C)
  • Air separation avoids condensate re-vaporization

Scroll Compressor

  • State-of-the-art compressor technology for highest efficiency & reliability
  • Quiet operation for less noise
  • Over 5 tons (18 kW), multiple compressors are staged to match the load


  • Forward curved centrifugal blowers
  • Backward-inclined centrifugal fans, plug fans on larger units

Electrical Service

  • Single point power connection, for all units


  • Simple ladder logic addresses wide variety of conditions
  • System can handle dehumidification, cooling, & heating
  • Occupancy contact ensures outdoor air enters only when needed

Cabinet Construction

  • Corrosion-resistant galvanneal with powder coat finish
  • Meets 1000 hour salt spray test
  • All serviceable elements accessible from one side of unit
  • Double-wall construction
  • R-5 insulation

Refrigeration Circuit

  • Dissipates captured heat into water loop
  • Unique design – no reversing valve
  • Modulating hot gas reheat


  • 4″ deep extended surface pre-filters (MERV 7)

Outdoor Design (Rooftop Models)

  • Rain hood, aluminum mist eliminator
  • Stainless steel fasteners
  • Isolation dampers
  • TEFC motors

Rx Energy Recovery Wheel (Optional)

  • Sensible & latent heat recovery
  • Significant energy savings by lowering operating costs

Additional Options Increase Flexibility

  • Top, bottom or end horizontal air discharge
  • Horizontal or Rooftop configurations available
  • Optional coil coatings available for corrosive environments
  • Optional power disconnects (fused & non-fused)
  • Contact factory for non-standard options

Downloads (Literature)

ClimateMaster, Inc.

7300 S.W. 44th Street

Oklahoma City, OK 73179


Learn more about other Climate Control Group companies

CCG | ClimaCool | ClimateCraft | IEC

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