Frozen Compressor

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

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!

The APR Control is Better Than Hot Gas Bypass!

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!
Chart explaining how to identify and fix high humidity issues

Solving High Humidity Challenges in HVAC Systems

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.
Installing APR Control at WMUR

Avoid Costly HVAC Callbacks

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.
Capacity Control with APR Control

Why Does DX Air Conditioning Need Capacity Control?

Everyday contractors, engineers, and building owners across the country turn to the ease of DX air conditioning for a variety of reasons. The challenge with DX systems is that they are oversized by design! This is due to the fact the cooling capacity (tonnage) of these systems are selected based on the space’s “design day” conditions. For those unfamiliar, a “design day” also commonly referred to as peak load conditions, takes into account the full ambient (highest outside temperature for the region) load, full building occupancy, all lights, computers and other equipment are on, occupant fresh-air ventilation, etc. The problem is that this “design day” rarely occurs. This means that the unit will be providing too much cooling capacity the majority of the time. Depending on where you are in the country, an oversized unit can have dire consequences for the indoor space and equipment.

Make Preventative Maintenance More Effective with the APR Control

Recommending the APR Control during preventative maintenance could be one of the best preventative solutions you, as a contractor or service technician, can offer to address problems before they become ongoing customer complaints. We have officially entered Spring, which means all of you contractors and service technicians are performing routine preventative maintenance on the HVAC equipment for your customers. Preventative maintenance provides the opportunity to diagnose the system a bit more thoroughly than you otherwise would during an emergency service call where the problem is immediate and appears obvious. The addition of the APR Control is a cost-effective and reliable solution that can be field installed on virtually any existing DX equipment to maximize efficiency, performance, and lifecycle!