ACEEE Summer Study on Energy Efficiency in Industry

Digi RTU Optimizer Case Study: New Technology to Maximum Energy

The Digi RTU optimizer is a proven new technology for roof top unit (RTU) air
conditioners. The Digi RTU Optimizer utilizes one variable frequency drive (VFD), to control
both fan and compressor speed on the RTU to which it is installed. As an after factory addition it
is a perfect fit for the multitude of existing inefficient RTU’s that are currently in the market. The
fact that it only takes one drive to control two components keeps the cost relatively low and
minimizes the concern of having multiple drives on one RTU. The Omaha Public Power District
(OPPD) reviewed the product and concurred that it performed as the manufacturer said it would
and that it was unique to the industry. The utility then proceeded to initiate their pilot to test
performance and public acceptance.

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Digi-RTU Enclosures Receive Underwriters Laboratories Certification

Underwriters Laboratories® (UL) tested the Bes-Tech Digi-RTU™ enclosures and has certified the devices to bear their logo.

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Bes-Tech exhibiting at AHR Expo

Bes-Tech will be Presenting and exhibiting at AHR Expo, Booth #5211.

Bes-Tech Digi-RTUTM rooftop HVAC optimizer presentation.

Date: Monday, January 28
Time: 11:00 am
Theater: A
Digi-RTUTM is an aftermarket control package designed for rooftop unit between 5 and 20 tons, that satisfies ASHRAE Standard 62.1 and California Title 24 requirements. The Digi-RTU technology reduces energy demand and consumption by up to 60% while maintaining space temperature of constant volume – constant capacity HVAC rooftop units. The Digi-RTU achieves these results by modulating the speed of both the compressor(s) and indoor fan based upon the space requirements, not the simplistic on/off of the original equipment design. Due to the lowered capacity, the Digi-RTU reduces unit cycling, mitigates demand, reduces energy consumption and better controls space temperature and humidity.

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Pacific Gas and Electric Company approves Bes-Tech’s Digi-RTU Optimizer Incentive Application

Pacific Gas and Electric Company (PG&E) approved Bes-Tech’s application requesting the Digi-RTU optimizer become a qualified custom incentive program.  PG&E accepted the application and agreed to use the incentive rate of $.15 per kWh and $100 per kW for a facility utilizing Digi-RTU optimizers.

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Digi-RTU Incentive Program

Omaha Public Power District and The City of Omaha Announce Digi-RTU Incentive Program.

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