WELCOME TO RAWAL DEVICES

Founded 1993 by Davis Rawal, Rawal Devices manufactures highly efficient and cost-effective solutions that solve temperature and humidity control problems in commercial, industrial and institutional building applications.

Our combination of technology, expertise and customer service ensures proper temperature and humidity control for greater comfort, indoor air quality and energy efficient performance, while providing an excellent return on your investment!.

Davis Rawal said “Let there be modulation” and it was good!

Davis Rawal, inventor of the Rawal Device, was one of those creative engineers who could uncover cost-effective solutions to unusual problems.

The APR Control enhancement has been a proven solution since 1993 when founder Davis Rawal patented his innovative APR Control. The APR Control enhancement has been a proven solution since 1993 when founder Davis Rawal patented his innovative APR Control. Rawal’s ingenuity ranged from inventions that resulted in patents (a very early air-to-air heat exchanger) to solutions that provided an edge in winning and completing a competitive project (a severely space-constrained DX evaporator air handling unit).

Part-load control that’s better than hot gas bypass

This creativity brought about the development of the APR Control, also known as the Rawal valve. Davis was consulting on a project where an engineer specified standard hot-gas bypass to the evaporator coil. The design required multiple large-capacity split systems with evaporators located a considerable distance from the condensers. Realizing that the hot gas would condense prior to arriving at the evaporator coil, Davis sought another solution. After the successful application of this unique solution, he recognized that it could be applied to a variety of needs for part load control. He simplified and engineered the device down to its compact size and patented it as the APR® Control.

Davis recognized that the unique design of the APR Control provided advantages such as lower installed cost – especially on split-system applications – and much smoother response to system and load changes. He envisioned additional opportunities and applications for the device.

New generation leads Rawal Devices for next-gen HVAC control

Since 1993, the APR Control has been applied to temperature- and humidity-sensitive spaces that would normally require considerably more costly solutions. Guided for the last 20 years by Davis’ son Richard, Rawal Devices has sold tens of thousands of APR Controls, providing system solutions to thousands of engineers, facility managers, and service contractors across the country and around the world.

  1. Rawal History

    The APR Control enhancement has been a proven solution since 1993 when founder Davis Rawal patented his innovative APR Control.

  2. Leadership

    The APR Control enhancement has been a proven solution for nearly 30 years since founder Davis Rawal patented his innovative APR Control. Today the firm is managed by his son Richard, dedicated to growing Rawal Devices into a leadership position for HVAC control technology.

  3. Responsiveness

    Rawal Devices’ technical staff is experienced, capable and responsive to the needs of HVAC professionals. Please contact us and we will be glad to assist you! Rawal Devices is particularly proud of our customer service availability and knowledge – call us!

  4. Distribution

    APR Valves are available through select HVAC distributors, Counter sales, designated OEMs, and directly through Rawal Devices. Call us today for advice on your application and how to purchase.

  5. Technical Proficiency

    Rawal Devices is the manufacturer of highly efficient and cost-effective solutions (including the APR Control (analog) and APR-E (digital) Valves) that solve temperature and humidity control problems in commercial, industrial and institutional building applications. Our combination of technology, expertise and customer service ensures proper temperature and humidity control for greater comfort, indoor air quality and energy efficient performance, while providing an excellent return on your investment!

About the team

We’re a dynamic group of individuals who are passionate about what we do and dedicated to delivering the best results for our clients.

  • Richard Rawal

    President / CEO

    From the age of 14, Richard learned the HVAC business in the family contracting firm. He attended engineering school and invested years in design-build contracting and service support along with his father, Davis.

    They started Rawal Devices in 1993 following successful patent of the APR Control. For over twenty years Richard has built the APR Control distribution process and created relationships with major OEMs, contractors and engineers across the country.

    Rawal Devices customers have always been his focus, and the APR Control has proven its effectiveness in delivering leading-edge control performance for building technologies.

  • Jason Santos

    Senior Technical Engineer

    Jason started in the HVAC industry at the age of 13, going on service calls with his father. After graduating from technical college he worked in the field for more than 30 years as a Service Technician, Service Manager and in start-up commissioning. Jason’s experience ranges from a limited tenure in the residential field to vast experience in the bio-medical field with an expertise in all aspect of DX equipment including chillers, VAV, VVT, Make-Up Air, and more. Towards his lasts days in the field, he was performing HVAC Forensic Analysis for large commercial /industrial spaces. He was instrumental in resolving issues from design issues to systemic automated control issues, as well as fundamental mechanical flaws. Jason joined Rawal Devices in 2017 as Senior Technical Engineer.

    Since joining the team, Jason has provided a wide range of training to both employees and service customers, took the lead on various research and development projects, and has been fundamental component of the APR-E project in both development and application. Jason has been published in the RSES Journal – check it out here!

  • David Larocque

    Sales Engineer

    After receiving his degree in Mechanical Engineering, David spent a few years working at Cambridgeport Air Systems, designing rooftop curbs and economizers. Looking to transition into more of a sales role, David joined Rawal Devices in 2018 as a Sales Engineer.

    As a quick learner and with a personable manner, David serves to educate customers and grow our industry reach, building upon his existing strong relationships.

Latest Resources

We’re a dynamic group of individuals who are passionate about what we do and dedicated to delivering the best results for our clients.

The Problem with Oversized HVAC Systems

Problem: HVAC systems are typically sized for full load conditions, which only occur for a small percentage of the year. The rest of the time that system is oversized, which can lead to many operational issues. Oversizing HVAC systems is a common industry practice to create safety margins when conditions… Read More

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Retrofit Existing R-410A HVAC Equipment Rather than Replace

​​Simplify Operations and Enhance Customer Satisfaction: Introducing the APR Control HVAC professionals face constant pressure to balance budgets, customer demands, and industry changes. The APR Control offers a cost-effective solution to simplify operations and maximize existing resources. By extending the life of your customers’ in-place R-410A… Read More

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APR Control Direct Compressor Energy Savings

APR Control Compressor Power Consumption Testing Parameters An HVAC equipment manufacturer conducted a test in their state-of-the-art testing facility to assess the direct energy-saving benefits of utilizing the APR Control at part load conditions. Original equipment performance parameters: 10-ton rated at AHRI 210/240 Two 5-ton stages… Read More

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The Rawal APR Control is a variable capacity enhancement to DX HVAC systems.