The Trane Intellipak Roof Systems have a sizing of 20 to 130 tons, or 240,000 to 1.56 million BTUs. For air conditioning, the Intellipak uses its Economizer, an energy-efficient mechanism that automatically draws in outdoor air for free-cooling. Intellipak produces heat from electricity, steam or natural gas, depending on the model. Electric heat units run on 48-amp circuits; the circuits contain nickel-chromium heating elements.
Trane's Intellipak II Roof Systems are a slightly larger variation of the Intellipak. Intellipak II has a sizing of 90 to 162 tons, or 1.08 to 1.94 million BTUs. Depending on the model, Intellipak II units provide 850 to 2,500 MBH of gas heat energy; a MBH is equivalent to 1,000 BTUs. Intellipak II units with electric heaters have a unit withstand rating of 480 volts or 600 volts.
Trane's Voyager roof units have a slightly smaller energy output than the Intellipak units. The smaller Voyager rooftop systems offer 12.5 to 25 tons, or 150,000 to 250,000 BTUs. Larger Voyager models have a sizing of 27.5 to 50 tons, or 330,000 to 600,000 BTUs. These HVAC rooftop systems have an annual fuel utilization efficiency (AFUE) rating of 81 percent. The smallest sized, gas-fired Voyager, which has a size of 12.5 tons, provides a 150 to 250 MBH gas heating performance.
The smallest of Trane's roof units is the Precedent, which has a sizing of 3 to 10 tons, or 36,000 to 120,000 BTUs. Precedent roof units have a SEER rating of 17.5. The SEER rating is the air conditioning's cooling output divided by the total electric energy input in watt-hours at the same time.