Since the APR Control was introduced to the HVAC market in the early 1990s, customers have installed the devices on a wide range of applications and systems. Tests have been conducted that validate the control’s effectiveness and energy efficiency, demonstrating the positive impact of retrofitting DX air conditioning systems.

Among the benefits provided by APR Control enhancement include better capacity control and modulation for greater space comfort and maintaining lower humidity levels, managing load fluctuations in high-percentage outside air systems and protecting the refrigerant circuit in variable air volume. The results we have seen show a significant improvement in energy efficiency when compared to reheat systems as well as standard hot gas bypass (as typically piped to the evaporator coil) in both package and split-system applications.

The following case studies demonstrate these results:

ASHRAE Research Project (RP-1604)

Resetting the discharge air temperature for development of ASHRAE cleanroom and energy saving standards


Nodaway School District

Retrofitting unit ventilators for improved IAQ and avoiding expensive system replacements


Indoor Agriculture & Grow Rooms

Meeting environmental challenges and creating optimal conditions forplant growth and crop yield


Angiotech Electronic Valve Test/Performance

Lowering humidity in an office environment.

Case Studies

The APR Control is NOT Hot Gas Bypass

APR Control® Complies with Energy Codes

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APR Control

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Transform any standard DX Air Conditioning system into a variable capacity system!

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Download Information on Precision Discharge Air Control with Rawal APR-E Valve

Achieve the performance of a chilled water system on a DX budget!

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