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Low GWP Rooftop Series: ST, shown

Low GWP Rooftop: Water-Cooled Units – 3 to 20 tons

Tranquility® (ST) Rooftop Series


Low GWP Stamp
Low Global Warming Potential (GWP): The Tranquility (ST) Rooftop Series

The Tranquility (ST) Rooftop Series showcases superb efficiency ratings, quiet operation, and application flexibility that is synonymous with the ClimateMaster Tranquility family. The Tranquility ST surpasses ASHRAE 90.1 efficiency standards and utilizes R-454B low Global Warming Potential (GWP) refrigerant, setting a high standard for ecofriendly performance. Due to its innovative and environmentally-conscious design, the Tranquility ST qualifies for LEED® (Leadership in Energy and Environmental Design) points.


  • Sizes 036 (3 ton, 8.7 kW) through 240 (20 ton, 70.3kW)
  • Exceeds ASHRAE 90.1 efficiency standards
  • Environmentally-friendly R-454B low-GWP refrigerant
  • Refrigerant Detection System (RDS) (mandatory on sizes 048 through 240, optional for size 036)
  • Dual refrigeration circuits (sizes 096 and larger)
  • Galvanized-steel cabinet construction with polyester powder-coat paint
  • Double-wall construction for access doors with stainless-steel hardware
  • Unique double-isolation compressor mounting with vibration isolation for quieter operation
  • TXV metering device
  • Easy-to-clean, rust-prohibitive, stainless-steel drain pan
  • Communicating Controls Powered by CXM2 (Sizes 096-240 only):
    • 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
  • Communicating Controls Powered by DXM2.5 (sizes 036-072 only):
    • Includes all of the CXM2 control features
    • 24V accessory relays
    • Variable-speed pump control
  • Up to 2-inch (5.08 cm) ESP capability
  • Slide-out blower assembly for quick servicing
  • High-efficiency EC plug fans
  • Unit Performance Sentinel performance monitoring system
  • Eight standard safety features


  • BACnet, Modbus and Johnson N2 compatibility options for Building Management Systems (BMS)
  • Demand-controlled ventilation (DCV) with optional enthalpy economizer and optional CO2 sensor
  • Two-way motorized water valves that prevent water flow through the unit when it is not in operation increasing system pumping efficiency
  • Internally-mounted water pump for single-pipe systems


  • Wi-Fi communicating (AWC) thermostat with color touchscreen
  • Wide variety of thermostat options to meet your application needs
  • Braided-hose kits in various lengths with optional water valve, PT plugs, blowdown valve, flow regulator, and strainer
  • 2-inch Merv 8
  • 4-inch Merv 8 or 13 filters
  • Aesthetically-pleasing wall sensors for connection to BMS (MPC) controls

Control Board – DXM2.5

Tranquility (ST) Rooftop Series: Close Up Look - Control Board

Easy-access controls box contains advanced communicating DXM2.5 controls that provide real-time operating conditions that reduces startup, commissioning, and service times by digitally providing key system temperatures and operating conditions. (Sizes 036-072 only)

Control Board – CXM2

Tranquility (ST) Rooftop Series: Close Up Look - Control Board

Advanced CXM2 digital controls with Remote Service Sentinel. (Sizes 096-240 only)


Tranquility (ST) Rooftop Series: Close Up Look - Hinge

Integrated lifting lugs. Heavy-duty cabinet, powder-coated, with stainless-steel hinges.

Filter (Optional
Pleated Filters Shown)

Tranquility (ST) Rooftop Series: Close Up Look - Filter (Optional Pleated Filters Shown)

Fully insulated including base pan. 2-inch fiberglass filters standard. Optional 4-inch & pleated filters.

ClimateMaster, Inc.

7300 S.W. 44th Street

Oklahoma City, OK 73179


Learn more about other Climate Control Group companies

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