The APR Control is NOT Hot Gas Bypass


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Applications


The APR Control’s unique technology can be utilized to improve a wide range of HVAC applications:

Oversized Air Conditioning

The APR Control is an optimal solution for oversized air conditioner systems. Standard air conditioning design requires the system capacity to meet maximum design criteria (i.e. maximum outdoor temperature, sunshine, internal occupancy, and ventilation requirements to name a few). Most systems will be designed larger than necessary for peak, “design day”, conditions. However, most of the year it will be operating during below peak conditions. An oversized system will result in short cycling of the compressor, causing unstable temperature and humidity levels, leading to an uncomfortable (and possibly unsafe) space. The modulation capabilities that the APR provides will help extend runtime, keeping airflow across the evaporator coil dehumidifying, while still allowing the system to meet maximum load demands.

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Comfort and Indoor Air Quality (IAQ)

The APR Control provides modulation for humidity control, the benefit of extended runtimes, and the ability to maintain a system in a dehumidifying mode. This allows a simple single-stage DX system to respond to a variety of operating conditions to solve a wide range of indoor air quality problems.

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Precise Temperature

Many applications, including surgery suites, clean rooms, high-precision manufacturing, etc., have tight temperature and humidity requirements and can benefit from the addition of the APR Control. By providing continuous capacity modulation to match changing load conditions, the APR and APR-E have helped correct many under-performing systems.

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Ventilation

The introduction of outside air with highly variable load creates the need for variable-capacity systems. APR Control enables the system to match capacity with changing load conditions.

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System reliability and longevity

A system that can modulate capacity also benefits from higher reliability and fewer operating problems because less stress is placed on the system’s compressor. Short cycling, low airflow from dirty filters, and other problems with the system can easily be corrected. As a result, the APR Control can reduce call-backs and warranty issues, even on new systems!

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Optimization: Improved system and overall application efficiency

The ability to modulate system capacity to match lower loads results in a lower compression ratio. This means the compressor has to do less “work.” We have seen selected applications produce significant drops in amperage draw versus full-load conditions. Ultimately, when comparing energy efficiency in part-load operation, the APR Control is more energy efficient than standard hot-gas bypass (to the evaporator coil) by about 12% to 15%, depending on operational conditions and system applications.

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