How to adjust the Rawal APR Control Valve

How to Adjust the APR Control

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For years, the APR Control has been known as a “set-it and forget-it” solution for capacity modulation throughout the HVAC industry. For most standard DX comfort cooling applications, the factory setting of the APR will solve the problem and typically does not require adjustment.
However, the APR Control is by no means a one-size fits all solution. Every job or application is unique, and it is completely adjustable if the runtime is inadequate or low load operation fails to cause suction pressure to fall low enough (the point at which the APR Control starts to open).
Read more to find out how to determine if the APR Control requires adjusting and learn more about the adjustment process. You will learn how to adjust the APR Control® Compression Ratio Reduction valve to gain the maximum performance from your DX system.

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APR Control maintains temperature and humidity levels in cleanrooms environmentsRawal Devices, Inc. 2023

Maintaining Temperature and Humidity Levels with the APR Control in Controlled Environments

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In any controlled environment avoid equipment off-cycles so you don’t “lose the room!” Maintaining tight temperature and humidity levels in controlled environments such as cleanrooms is critical to prevent material damage, production loss, and shutdowns. Installing the Rawal Devices’ APR Control can be the perfect, cost-effective solution to avoid any interruptions in production as a result of the failure to maintain quality. Here’s how…

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APR Control mounted in a packaged rooftop hvac unit.Rawal Devices, Inc. 2022

Installing the APR Control: Everything You Need to Know

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Installing the APR Control is straight-forward and doesn’t take a lot of guesswork from the technician. It is common for HVAC technicians who are unfamiliar with the APR Control to be intimidated by the installation process. The truth is, once the APR Control is installed, we often hear how much service technicians love the APR Control as a tool having to solve common HVAC challenges. Let’s address all the commonly asked questions and concerns about installing the APR Control valves. We also have a new installation video available to help you prepare and install the APR Control as seamless as possible!

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Indoor Cannabis Grow Room HVAC

Meeting Cannabis Grow Room HVAC Challenges

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Mechanical HVAC systems can be the greatest limiting factor or the greatest opportunity to maximize productivity and profits in the indoor Cannabis Cultivation Industry. Those involved in HVAC for Cannabis design, service, and operations are realizing that undersized or oversized systems from inaccurate load calculations for a given room lead to major challenges.
The lack of traditional funding for cultivators is a key contributor to underperforming HVAC design choices leading to poor crop yield and ultimately – Less Profit! Rawal Devices has seen poorly designed, and underperforming cultivation facilities that were in desperate need of control improvements without replacing the equipment. The APR Control will provide the perfect solution to improve both existing and new air conditioning equipment performance and reliability.
Rawal Devices has modulating technology, both mechanical and electronic, that transforms standard systems into variable capacity systems. This is critical for growing cannabis! With the APR’s ability to provide capacity modulation and precision discharge air control, your units will be able to meet ever-changing room criteria to maximize your plant yield and your customers’ profits!

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Common Problems Associated with Oversized DX Air Conditioning Systems

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Diagnosing or troubleshooting your customer’s air conditioning unit can be a daunting task, which can take up a lot of your time and potentially deplete your warranty reserve. One of the most overlooked issues is having too much cooling capacity as most commercial DX air conditioning systems are oversized for most of the year. As a result, you will likely experience:
Short Cycling, higher than desired humidity levels, varying and uncomfortable space temperatures, potential coil freezing and more. If you’re experiencing any of these issues, we have a solution for you and your customers! The APR Control!

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APR vs Hot Gas Reheat Comparison Table

The In-Stock Solution for Hot Gas Reheat Applications!

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Rawal Devices understands there are a multitude of reasons why customers request a system with Hot Gas Reheat (HGRH); such as the need for additional dehumidification capabilities that off the shelf equipment cannot provide.

Although hot gas reheat has been a common method to achieve design goals including dehumidification and temperature control, the APR Control is often a less expensive preferred design solution. There are plenty of projects that can be successful with just the APR Control’s continuous capacity modulation capabilities.

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Frozen Compressor

How to Prevent Evaporator Coil Freezing and Compressor Floodback/Slugging!

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During part-load or non-design day conditions or with lower airflow, you’re going to have less total heat content across the evaporator coil compared to your compressor capacity. Having enough heat content in the air entering the evaporator is critical to prevent Evaporator Freezing and Liquid Slugging or Floodback.

The APR Control’s ability to provide variable capacity control through mechanical means allows your system to match capacity of your equipment to the total heat load across the evaporator coil.

Rawal Devices’ APR Control can eliminate or prevent common problems associated with DX cooling – including eliminating Evaporator Coil Freezing and Liquid Slugging!

As a result, APR Control reduces downtime from labor-intensive service calls and costly warranty issues, make the APR Control a very cost-effective solution for problems occurring on you existing equipment and even on new systems!

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The APR Control is Better Than Hot Gas Bypass!

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As the APR Control has been embraced by the industry, it has often mistaken for and compared to Hot Gas Bypass. There are key differences that separate the two solutions, especially in terms of superior dehumidification the APR Control provides. Learn more about why the APR Control is the preferred solution!

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Chart explaining how to identify and fix high humidity issues

Solving High Humidity Challenges in HVAC Systems

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One of the biggest contributing factors to high humidity is the lack of compressor run-time, commonly known as short cycling. This is often a result of a system being oversized, providing too much cooling capacity for a space, and satisfying the thermostat too quickly. Having some form of capacity control is the most effective way to prevent short cycling from occurring and the APR Control is the perfect solution!

Rawal Devices’ APR Control offers a simple, reliable, and cost-effective solution that can eliminate or prevent high humidity because of compressor short cycling.

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Installing APR Control at WMUR

Avoid Costly HVAC Callbacks

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In HVAC Service, callbacks and warranty issues are an enormous problem and headache for HVACR contractors and service technicians. With the addition of the APR Control, you can eliminate callbacks on new equipment and improve performance of older/in-place equipment, saving you both time and money!

Of course, contractors should always follow best practices when it comes to start-up and commissioning newly installed equipment to ensure proper operation. However, callbacks can be inevitable and are not necessarily a result of anyone’s failure to install the part or equipment properly. More often than you might think, callbacks and warranty issues are related to equipment problems.

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