Skip to content
Find Trane Rep

Series R® Helical Rotary Screw Chillers

Models RTZA, RTWD, and RTHD

Overview

Proven performance, modern versatility.

  • Capacity Range: 80-400 tons; 600-5,000 MBH
  • Refrigerant: R-513A, R-515B, and R-1233zd(E)
  • Compressor Type: Helical Rotary Screw
  • Controls: Symbio® 800-Unit Controller 
  • Applications: Industrial Process Cooling and Heating; Commercial Comfort Cooling and Heating

  1. One Portfolio, Many Possibilities

    Series R® helical rotary screw chillers offer versatility for commercial and industrial process applications requiring precise temperature control. Their wide operating temperature range, electronic expansion valve, and short anti-recycle timers provide flexibility for high-performance cooling and heating systems.

  2. Sustainable Innovation

    Series R® helical rotary screw chillers help reduce environmental impact by using low and ultra-low GWP refrigerants including R-513A, R-515B, and R-1233zd(E).

    The Symbio® 800 controller enables secure connectivity and integration with building automation systems.

  3. A Proven Platform

    Since 2006, the Series R® platform has delivered proven performance. Accelerated life testing simulates thousands of hours of operation on the compressor, the heart of the Series R® chiller. The direct-drive helical rotary compressor design has fewer moving parts with premium bearings for enhanced operation.

  4. INSTALL OUTLINE - SVG

    Big Capabilities in a Compact Footprint

    Chiller replacement can be faster, cheaper and less disruptive due to the compact size of the Series R® helical rotary screw chiller, which fits into most existing mechanical rooms without requiring additional floor space or wall tear-outs. Units can pass through a standard double doors (72-inch by 80-inch) fully assembled, and both single- and dual-point power connections can take advantage of existing wiring. 

Product Information

Series R Water Cooled Chiller RTZA Angle Front Left Transparent
  • The Trane helical rotary screw compressor, the heart of the Series R® chiller, is a proven design resulting from years of research and thousands of test hours. 
  • The falling film evaporator in the Series R® chiller features a Trane patented design that requires less refrigerant charge.
  • Series R® chillers provide high compressor lift capabilities for use with heat recovery and non-reversible water-to-water heat pump applications for highly efficient system designs.  
  • The direct drive, low-speed compressor with only four moving parts delivers efficiency and reliability with low maintenance requirements. 
  • The suction gas-cooled motor stays at a uniformly low temperature for enhanced motor life. 
  •  The electronic expansion valve, with fewer moving parts than alternative valve designs, provides reliable operation at high lift conditions. 
  • Tracer® SC+ building automation system features pre-engineered chiller plant control, enhancing the rotation, staging and sequencing of multiple units to meet dynamic building loads.

 

  1. RTZA (Chiller Capacity 80-250 tons; 1300-3000 MBH)

    • Operates with ultra-low refrigerant R-1233zd(E) with a GWP of 1. 
    • By utilizing existing medium-temperature heat sources, the RTZA heat pump chiller delivers hot water temperatures to 210°F (99°C).
    • Ideal for high-temperature commercial and industrial process heating applications.

  2. RTWD (Chiller Capacity 80-250 tons; 600-3,000 MBH)

    • The RTWD heat pump chiller features expand heating capabilities of up to 165°F (74°C) with refrigerant R 515B.
    • Operated with R-513A refrigerant for both comfort cooling and low-temperature industrial process cooling applications, with leaving evaporator solution temperatures as low as 10°F (-12°C).
    • Ideal for process cooling and commercial comfort cooling and heating applications.

  3. RTHD (Chiller Capacity 175-400 tons; 2,100-5,000 MBH)

    • R-513A refrigerant utilized for all applications.
    • The RTHD chiller can be configured to produce leaving evaporator solution temperatures as low as 5°F (-15°C) for industrial process cooling applications. 
    • The RTHD chiller can generate condenser water temperatures as high as 111°F (44°C). 
    • Ideal for process cooling and commercial comfort cooling applications.

Series R® Helical Rotary Screw Chillers

Two proven workhorses known for their reliability, Trane’s Series R® helical rotary screw chillers offer dependable performance and versatility. The RTWD model features expanded heating capabilities up to 165°F, and both RTWD and RTHD models operate with low-GWP refrigerants and are available with the Symbio® 800 equipment controller.

Product Literature

Brochures

Catalog

Installation Operation Maintenance (IOMs)

Environmental Product Declaration (EPDs)

Integration Guides

Software & Firmware

FAQs

Your questions about rotary screw chillers, answered.

A rotary screw chiller is a type of chiller that uses a rotary screw compressor to compress the refrigerant. This type of chiller is known for its efficiency and reliability, making it suitable for a wide range of applications, including commercial and industrial cooling (and now heating with our RTWD model achieving temps of up to 165F/74C!).

A water-cooled rotary screw chiller works by using a rotary screw compressor to compress the refrigerant, which then absorbs heat from the water circulating through the chiller. The heat is then transferred to a cooling tower or another heat rejection device, where it is dissipated into the atmosphere. This process effectively cools the water, which can then be used for air conditioning or process cooling.

Yes, a helical rotary chiller is a type of screw chiller. The term "helical" refers to the shape of the rotors inside the compressor, which are designed to compress the refrigerant efficiently. Helical rotary chillers are known for their smooth operation and energy efficiency.

Both chillers are great options and each excels at different applications. The best choice will depend on tonnage, load profile, energy goals, acoustic requirements, and cost. Screw chillers are best fit for small to mid size capacities, retro-fit applications, and offer a lower install cost.

Looking for parts?

Visit Trane Supply

Related Products

  • Agility HDWA Hero Left No Background

    Agility® Magnetic Bearing Centrifugal Chiller

    Model HDWA

    The Trane Agility® Magnetic Bearing Centrifugal Chiller provides best in class performance that exceeds ASHRAE standards and a compact size that minimizes your installation costs.

  • CenTraVac CDHH Background

    CenTraVac® Water-Cooled Centrifugal Chillers

    Models CVHE, CVHF, CDHF

    Trane CenTraVac water-cooled centrifugal chillers feature a time-tested low-pressure design utilizing ultra-low GWP refrigerants R-514A and R-1233zd.

  • Thermal Battery Storage Source Heat Pump System With Hydronic Branch Conductor Controls

    Comprehensive Heat Pump Chiller Systems

    Pre-engineered Hydronic Heating

    Discover how Trane heat pump chiller systems simplify the implementation of cost-effective, energy-efficient, reliable, sustainable cooling and hydronic heating while helping to reduce carbon emissions.

  • Air-Cooled Thermal Energy Storage System at Davidson

    Thermal Battery Energy Storage Systems

    Trane® Thermal Battery™ Storage systems help lower utility bills, increase sustainability, and provide greater operational flexibility by integrating thermal energy storage.

  • Comprehensive Chiller-Heater System with Hydronic Branch Controls

    Air-to-Water Heat Pump System

    Discover the Trane air to water heat pump system, a customizable electric HVAC system that works with many existing hydronic heating systems.

  • AdobeStock_571238892.jpeg

    Smart Building Solutions

  • systems-category-page-1400x600-web-banner.png

    Commercial HVAC Systems

    A robust portfolio of innovative, reliable, efficient end-to-end HVAC systems for high performance thermal management that turn problems into possibilities.

Customer Stories

Learn how we’ve helped customers like you.

All Customer Stories

Discover More of What’s Possible with Trane 

  • design-and-analysis-tools-1400x600-web-banner.jpg

    HVAC Design and Analysis Tools

    Backed by Trane's long history of HVAC system design and software simulation knowledge, our cutting-edge HVAC tools and calculators answer your challenges and help create a more sustainable world.

  • Happy business people, handshake and meeting in teamwork for partnership or collaboration in boardroom. Woman person shaking hands in team recruiting, introduction or b2b agreement at the workplace

    Energy Services

    Advance your mission with Trane as your dedicated partner in creating lasting improvements for your people, facilities, and future.

  • Business people working in the modern office

    Building Decarbonization Solutions

    The journey to decarbonize your building is uniquely yours and Trane can meet you at any point. Whether policy, regulations or your own ESG goals are motivating your building to change, Trane has the answers.

  • A engineer under checking the industry cooling tower air conditioner is water cooling tower air chiller HVAC of large industrial building to control air system.

    Maintenance and Repair Services

    Maintenance and repair services help commercial buildings run efficiently, minimize downtime, and extend equipment life with expert HVAC and facility support.

  • Ensemble on a Desktop

    Building Control Solutions

    Enhance your buildings performance with Trane’s innovative building control solutions, designed for both modern and previous systems to improve comfort and reduce energy consumption.

  • tc-es-electrification-to-carbon-reduction-thumbnail.jpg

    Electrification Solutions

    When electrification of heat becomes part of your building’s decarbonization journey, contact your Trane office. We can support you every step of the way.

Tools for your trade.

Consulting Engineers

Supporting engineers who are designing the future. We provide tools for your trade so that we can support you in designing our future.

Facility Managers

Transform your building with our solutions in controls, services, and rentals. Stay ahead of trends, leverage technology, and ensure efficiency, safety, and sustainability.

Contractor Solutions

More than just equipment, Trane offers unwavering support and professional guidance. With over 100 years of experience, we know the importance of bringing the blueprints to life. Your job demands flawless execution and we’re here for you.

Contact Us

Help is closer than you think.

Work with dedicated local Trane representatives who can team with you to solve your problems while providing training and insights.

Find Your Trane Rep