Why You Should Choose APR Control

APR Control vs. Digital Scroll & Other Variable Speed Technology

Engineers, Technicians & Contractors are curious about how the APR Control compares to similar technologies that provide system compressor and capacity modulation. This page shows the similarities and differences of Digital Scroll Compressors, VRV or VRF Systems cost, performance, and reliability.

Why is the APR Control Better Than Digital Scroll?

  • Lead Time & Availability
  • Lower Cost
  • Service-Friendly
  • Comparable Performance


The APR Control:

The APR can be installed on both new and retrofit projects; allowing you to keep existing in-place systems and still achieve variable capacity at a reduced budget.

The initial costs of APR Control is significantly less than the alternative compressor technologies. This low initial cost greatly outweighs the cost disadvantage of VRF system’s installation, maintenance, and repair.

APR Control’s low failure rate results in lower service and maintenance costs.

Variable Speed Alternatives:

The initial cost and installation of replacing existing equipment with an entirely new systems equipped with variable speed compressors is considerable.

The cost of replacement parts (ex. computer chips/boards) for the newer technologies is another significant cost disadvantage when it comes to repairing Digital Scroll Compressors, VRV, or VRF systems.


The APR Control:

The APR Control is a completely mechanical devices that is easy to understand when compared to new technology.

The APR has become well-known for its “Technician Friendliness” and requires virtually no troubleshooting after installation. It is truly a set-it and forget-it modulating solution.

Alternative Technology:

The disadvantage of the newer technologies, like VRV or VRF systems, is that it is time-consuming for commissioning, troubleshooting, and the repair process.

Digital scrolls and variable speed technology require much higher commitment to regular maintenance and service. That is why most facilities (like K-12 schools, universities, and government/public buildings) prefer systems that their technicians are familiar with and can easily manage.

Proven Reliability

The APR Control:

Simply put, the APR control has an extremely low failure rate and is maintenance free!

The APR protects your compressor along with the rest of the system against missed or improper maintenance.

Variable Speed Alternatives:

New technology (Digital Scroll, VRV or VRF systems) are susceptible to electrical failures (ie. brown outs, single phasing, etc.). The APR Control is not susceptible to any electrical fault.

The complexity of the new technological options poses ever increasing challenges to your service & installation teams. Choose what your sales reps and mechanics KNOW works.

Exceptional Performance

The APR Control:

The APR Control provides excellent turn down capabilities, upwards of 10:1 turndown.

The APR also unloads the compressor to save power for comparable energy efficiency.

The APR Control is considerably quieter during operation compared to Digital Scroll  or VFD compressors, so it does not require noise or vibration control measures for harmonic resonance or skip frequency concerns.

Alternative Technology:

A major disadvantage of the newer alternative variable speed technology is that the performance of those systems suffers during periods of high modulation. In fact, in certain applications they actually lose latent capabilities (ability to remove moisture) during high turndown.

Technical Support

Rawal Devices proudly offers LIVE customer service, engineering and technical support!

With over 30 years of experience supporting a variety of air conditioning installations, our engineers and customer support personnel can provide:

  • Selection and sizing guidance
  • Installation training
  • Application/refrigeration piping oversight
  • Application feedback and support
  • Exceptional technical capabilities and support
    • Before the sale – confirming proper selection and application
    • Post-sale – installation support
    • After Installation – Readily available and personable technical troubleshooting and performance confirmation

Since 1992, Rawal Devices has been in business with continuous support from most major manufacturers because of our holistic approach to environmental comfort conditioning and process applications.

We consider many factors that impact system performance, such as:

  • system size and staging
  • load parameters
  • current operating issues (including duty cycle and humidity levels)
  • controls integration

We encourage you to call us, or fill out our online contact form today!

APR Control Benefits to the Engineer

Including the APR Control® on plans & specifications provides the engineering firms with flexibility in system selection!

Learn more

Utilizing The APR Control in VAV/VVT Systems

APR Control® Improves the Functionality of VAV & VVT Systems Through Its’ Capacity Modulation and Dehumidification Capabilities

Learn more

The complex internal controls of a VRF system
the internal piping of VRF systems is very complexed