Trane CHHN60 Screw Compressor: Applications, Performance and Replacement Options for Commercial Chillers

When a commercial chiller goes down, the compressor can quickly become the center of attention. In hospitals, manufacturing facilities, office buildings, campuses, data centers, and other large facilities, losing chilled water can affect far more than occupant comfort.

For systems equipped with a Trane CHHN60 compressor, replacing the compressor does not necessarily mean replacing the entire chiller. A properly selected remanufactured CHHN60 can offer an alternative when the chiller and its other major components remain serviceable.

The Trane CHHN family uses a helical rotary, or twin-screw, design. The CHHN60 is one of several capacities in this compressor family and is designed for demanding commercial cooling applications.

What Is a Trane CHHN60 Compressor?

The Trane CHHN60 is a hermetic helical rotary screw compressor used in commercial HVAC applications.

According to Trane CHHN technical documentation, the CHHN model number identifies several important compressor characteristics. The CHHN designation describes a helical rotary compressor with a serviceable suction-gas-cooled motor, while the 060 designation identifies the 60-ton capacity version at the referenced rating conditions.

The same CHHN family also includes 35-, 40-, and 50-ton versions. Unlike a reciprocating compressor that uses pistons moving inside cylinders, a twin-screw compressor uses two intermeshing helical rotors. As the rotors turn, they trap refrigerant vapor and compress it as the space between them decreases.

This design makes screw compressors well suited for larger commercial cooling loads and applications requiring extended operation.

Where Is the Trane CHHN60 Used?

The CHHN compressor family is associated with larger commercial HVAC/R applications where reliable chilled-water cooling is important.

Depending on the equipment and system configuration, these types of chillers may serve facilities such as:

• Hospitals and healthcare facilities
• Manufacturing plants
• Universities and schools
• Large office buildings
• Hotels and resorts
• Data centers
• Government facilities
• Large retail properties
• Industrial facilities

These applications can run a compressor for long hours. A chiller serving a large commercial building may operate for extended periods during hot weather. A healthcare facility or data center may have cooling requirements that continue regardless of the time of day.

This is one reason proper compressor selection, installation, and system maintenance matter. Contractors looking for a replacement can view the current Trane compressor inventory available from Compressors Unlimited.

Why Does the CHHN60 Use a Screw Compressor Design?

The twin-screw design is particularly useful for commercial HVAC/R applications because it provides continuous compression rather than the individual compression strokes associated with piston-based designs. Two precision-machined helical rotors rotate inside the compressor housing. Refrigerant vapor enters the compressor, becomes trapped between the rotors and housing, and is compressed as the rotors continue turning.

The compressed refrigerant then moves to the discharge side and continues through the refrigeration circuit. This design offers several advantages for larger HVAC/R systems.

Continuous Refrigerant Compression

The screw compressor's rotary motion provides a relatively smooth compression process. This makes screw compressors well suited to applications requiring substantial cooling capacity over long operating periods.

Capacity Control For HVAC/R Applications

Commercial cooling demand rarely remains constant. A building may need much less cooling in the morning than during the hottest part of the afternoon. Chiller systems are therefore designed to respond to changing loads rather than simply operating at maximum capacity all the time.

Capacity control helps the system better match compressor output to actual cooling demand.

Commercial Chiller Applications

The combination of capacity, reliability, and controllability has made screw compressor technology common in commercial chilled-water systems.

For a broader look at this technology, Compressors Unlimited provides additional information about screw compressors for industrial HVAC/R systems.

What Do the Numbers and Letters in a CHHN Compressor Model Mean?

This is an especially useful question for contractors searching online for a replacement. Do not assume every CHHN compressor is interchangeable. Trane's CHHN model numbering system contains information about capacity, voltage, design sequence, capacity controls, motor rating, and volume ratio.

For example, Trane documentation identifies the capacity portion of the model number as:

035 = 35 tons

040 = 40 tons

050 = 50 tons

060 = 60 tons

Other characters identify electrical and design characteristics. That means simply telling a supplier, "I need a CHHN compressor," is not enough information to ensure the correct replacement. The complete compressor nameplate should be recorded.

What Should Be Verified Before Replacing a Trane CHHN60?

The safest approach is to provide the complete model number from the compressor nameplate.

Important information can include:

• Complete model number
• Voltage
• Phase
• Frequency
• Application
• Refrigerant
• Chiller information
• Existing system configuration

Trane's CHHN documentation shows that this family was produced with multiple voltage configurations, which makes electrical verification particularly important. Never assume another CHHN60 is automatically a direct replacement simply because the capacity designation matches.

Compressors Unlimited also offers a commercial compressor replacement finder that lets contractors search by the existing compressor model number or system specifications.

What Causes a Trane Screw Compressor to Fail?

Screw compressors are built for demanding service, but they are not immune to system problems. When a CHHN60 fails, identifying the cause is as important as finding a replacement.

Potential contributors can include:

Lubrication Problems

Proper lubrication protects bearings and other internal components. Oil-related problems can increase wear, cause excessive heat, and eventually damage the compressor.

Contamination

Moisture, debris, acid, and other contaminants circulating through the system can damage a replacement compressor if the refrigeration circuit is not properly cleaned.

Electrical Problems

Technicians should investigate voltage problems, motor issues, loose electrical connections, control failures, and other electrical conditions before installing a replacement compressor.

Abnormal Operating Pressures

A compressor operating outside its intended conditions can experience excessive stress and heat. Technicians should investigate the entire refrigeration circuit rather than treating the compressor as an isolated component.

High Operating Temperatures

Excessive heat can affect oil, bearings, motor windings, and other components. Identify the source of abnormal temperatures before returning the chiller to normal service.

Replacing a damaged compressor without correcting the condition that damaged it can result in another expensive failure.

Can a Trane CHHN60 Be Remanufactured?

In most cases, yes. The CHHN family is among the Trane screw compressors that can be professionally remanufactured. Remanufacturing involves much more than repairing the immediate failure.

Compressors Unlimited fully disassembles commercial compressors during remanufacturing. Components are inspected, worn or damaged parts are addressed, the compressor is reassembled to the required specifications, and the finished compressor is tested before shipment.

When Does a Remanufactured CHHN60 Make Sense?

The answer depends on the condition of the complete chiller. If a chiller has major problems throughout the system and is approaching the end of its practical service life, replacing the compressor may not be the best long-term investment. But consider a different situation.

A facility has a commercial chiller that has been maintained properly. The heat exchangers, controls, piping, and other major components remain serviceable, but the compressor experiences a failure.

Replacing the entire chiller could involve substantial equipment cost, installation work, piping modifications, electrical work, controls integration, and downtime. In that situation, replacing the failed CHHN60 may let the facility keep an otherwise functional chiller.

A remanufactured compressor may also be worth considering when a new replacement has a long lead time or when controlling repair costs is a priority.

Is a Remanufactured Trane Screw Compressor Reliable?

Reliability depends heavily on the quality of the remanufacturing process and the condition of the system where the compressor is installed. A replacement compressor cannot compensate for an unresolved system problem.

The contractor still needs to verify operating conditions, electrical supply, lubrication, refrigerant circuit cleanliness, controls, and other factors before startup.

When properly remanufactured, correctly matched, and installed into a healthy system, a remanufactured compressor can provide a practical way to extend the service life of commercial HVAC equipment.

Frequently Asked Questions About the Trane CHHN60

Is the Trane CHHN60 a screw compressor?

Yes. The CHHN family uses a helical rotary twin-screw compressor design.

What capacity is the Trane CHHN60?

Trane's CHHN model documentation identifies the 060 designation as the 60-ton capacity version at its referenced rating conditions.

What is a Trane CHHN60 used for?

The CHHN60 is intended for larger commercial HVAC/R cooling applications, particularly systems that use screw compressor technology to provide chilled-water cooling.

Can a Trane CHHN60 compressor be remanufactured?

In most cases, yes. Trane CHHN screw compressors can be professionally remanufactured. Evaluate the compressor's condition and exact application to determine the appropriate replacement.

Are all Trane CHHN60 compressors interchangeable?

No. Verify the complete model number. Voltage, frequency, design configuration, motor characteristics, and other model-specific details can vary.

Where can I find a replacement Trane CHHN60?

Compressors Unlimited stocks remanufactured Trane commercial HVAC compressors, including CHHN models. You can check current availability through the company's compressor inventory.

Finding the Right Trane CHHN60 Replacement

When a commercial chiller equipped with a Trane CHHN60 compressor goes down, the goal should not be to find a compressor that simply looks similar or shares part of the model number.

The goal is to identify the correct replacement for the specific chiller and determine why the original compressor failed.

That means checking the complete model number, electrical characteristics, operating conditions, lubrication system, controls, refrigerant circuit, and overall condition of the chiller.

Compressors Unlimited currently carries multiple CHHN models along with other Trane screw compressors for commercial HVAC applications. If the exact compressor is not immediately identified, the company can also help match the existing model and specifications to an appropriate replacement.

Contractors and facility managers looking for a Trane CHHN60 replacement compressor can request a compressor quote using the complete model information from the existing compressor.