The high-efficiency equipment complies with Tier 4 emissions requirements of the U.S. Environmental Protection Agency. It includes the new 7500 and 7300 single-temperature belt-driven models, which require less power than Carrier Transicold's prior platform, as well as competitive equipment designed for 2013 Tier 4 compliance. The new units provide 68,000 and 66,000 BTUs of cooling, respectively, at a setpoint of 35 degrees Fahrenheit. According to Carrier Transicold, the X4 Series uses "significantly" less engine power, fuel and refrigerant, while achieving higher refrigeration capabilities and faster pulldown than previous models. The units achieve 35- to 50-percent more BTUs of cooling per gallon of fuel, at AHRI rating conditions, than the company's current designs. For users hauling frozen loads in higher-ambient temperatures, fuel savings of up to 22 percent over earlier models are possible, the company claimed.

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