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Low GWP Large Belt Drive Packaged Series: SB Horizontal and Vertical, shown

Low GWP Vertical Stack Units – 0.5 to 3 tons

Tranquility® (SM) Vertical Stack Series


Low GWP Stamp
Low Global Warming Potential (GWP): The Tranquility (SM) Vertical Stack Series

The Tranquility® (SM) Vertical Stack Series offers an innovative, labor-saving solution for spaces where individual, quiet control of the heating and cooling systems is important. The Tranquility SM offers a proven solution that is designed and manufactured in America, exceeds ASHRAE 90.1 efficiencies, and uses R-454B low Global Warming Potential (GWP) refrigerant making it an extremely environmentally friendly space conditioning product solution. Featuring a contractor/technician friendly design, the Tranquility SM has a compact footprint that minimizes its impact on salable space, maximizes comfort levels of occupants, and has been proven as a preferred system in thousands of multi-story building applications across North America.


  • Sizes 06 (1/2 ton, 1.8kW) through 36 (3 ton, 10.6 kW)
  • Environmentally-friendly R-454B low-GWP refrigerant
  • High-efficiency rotary and scroll compressors
  • Exceeds ASHRAE 90.1 efficiencies
  • Removable chassis allows staged installation and ease of maintenance
  • Coaxial heat exchanger
  • Galvanized-steel cabinet construction
  • Chassis rests on rubber-grommeted isolated condensate pan for vibration reduction
  • Unique double-isolation compressor mounting for quiet operation
  • TXV metering device
  • Cabinet construction for unit or remote-mounted controls
  • Eight standard safety features
  • Microprocessor controls with on-board fuse and emergency shutdown
  • Integrated drain pan with condensate-overflow sensor
  • Field-convertible supply air on all sides and the top
  • Field-convertible riser supply, return, and condensate locations on the left, right, or back sides
  • Communicating Controls Powered by CXM2:
    • Multiple communication pathways for unit access and diagnosis:
      • Cloud-based remote monitoring via Wi-Fi communicating color-touchscreen thermostat
      • Connect directly to the system with a handheld service tool
    • Provides real-time unit operating conditions
    • Reduces startup, commissioning, and service time by providing key system temperatures electronically
    • Captures operating conditions in the event of a safety shutdown


  • High-efficiency EC blower motors:
    • Intelligent Constant Volume (CV) EC motors for ultimate airflow control
    • Entry-level Constant Torque (CT) EC motors provide efficiency at a value
  • Communicating Controls Powered by DXM2.5:
    • Includes all of the CXM2 control features
    • Dial in desired airflows for (CV) EC blower motors
  • vFlow® modulating water flow:
    • Modulates water flow to maintain a water-temperature differential
    • Changes operation to modulate to a leaving-water temperature during extreme entering-water temperatures
    • Provides ultimate variable water-flow control
    • Functionally operates as both a water-flow regulator and water close-off valve
  • 2-inch filter rail to support higher indoor air-quality filters
  • BACnet, Modbus, and Johnson Controls N2 compatibility options for Building Management Systems (BMS)
  • Factory-configured supply-air openings with or without dust protection
  • Full-port shut-off valves with memory stop, for supply and return risers.
  • Unit-integrated power disconnect
  • Field quick-connect thermostat whips in 15-, 25-, 35-, and 50-foot in lengths
  • Factory-mounted high-density rubber isolation pad
  • Easy-to-clean rust-prohibitive stainless-steel drain pans
  • Extended-range insulation for geothermal applications
  • Autoflow regulators that limit water flow to the unit preventing system overpumping
  • Two-way motorized water valves that prevent water flow through the unit when it is not in operation increasing system pumping efficiency (fail-open or fail-closed options)
  • Three-way motorized water valves that allow continuous water flow through the water loop, reducing pressure drop when the unit is not in operation (usually applied on the top floor of a system)
  • Internally-mounted water pump for single-pipe systems
  • RIB relay (sizes 06-18) box for quiet contactor closer
  • UltraQuiet sound-attenuation package
  • Refrigerant Detection System (RDS) (optional for all sizes)


  • Copper risers:
    • Swedged ends ready for quick drop-in connection when brazing is used
    • End treatment ready for crimped (torch-less) style connections
  • Unit stands that prevent clearance issues with tall baseboards
  • Single, Double, and Double deflection with opposed dampers supply-air grilles
  • Fresh-air frame kit for connection to outdoor air ducting
  • Flush-mounted return-air panel (L style) with fixed frame and removable panel for easy chassis access/removal:
    • Available in Bright White or Polar Ice paint colors
  • Attractive return-air panel with hinged access door (G style):
    • Key Lock Option
    • Available in Bright White or Polar Ice paint colors
  • Stainless-steel braided-hose kits for connection from piping risers to the chassis
  • Selection of thermostats including programmable, Wi-Fi, and color touchscreen
  • Filters - 1-inch (Merv 8 or 11) or 2-inch (Merv 8 or 13)

Control Board

Tranquility (SM) Vertical Stack Series: Close Up Look - Control Board

Advanced digital controls with Remote Service Sentinel. Shown with optional DDC controller. Optional enhanced controls (DXM2.5) also available.

Blower Motor

Tranquility (SM) Vertical Stack Series: Close Up Look - Blower Motor

Torsion-flex blower motors SM09-12.


Tranquility (SM) Vertical Stack Series: Close Up Look - Chassis

Exclusive dual compressor vibration isolation lowers vibration and reduces noise for quiet operation. Removable chassis allows staged installation and ease of maintenance/service once installation is complete.

Drain Pan

Tranquility (SB) Compact High-Capacity Series: Close Up Look - Condensate

Integrated drain pan with condensate overflow protection. Optional stainless steel insulated drain pan.

ClimateMaster, Inc.

7300 S.W. 44th Street

Oklahoma City, OK 73179


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