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36 MARCH 2016 | FUEL OIL NEWS | www.fueloilnews.com turndown, and they're daisy-chained together to fire in lead-lag configuration. Altogether, we'll have a 30-to-one turndown," explained Husmann. "Tied to an outdoor reset, the system will modulate with the crazy temperature swings we have in this valley." With the material in the shop, manpower on tap and draw- ings on paper, all they waited on was the word "Go". Day 1 Husmann technicians hauled a skid-loader to the school and used it to drag the old boilers out of the mechanical room. While three techs worked at demolishing the system, three more carefully unpacked the new Alpine 800s and got them ready for installation. Before the end of the day, the big boilers were set and the Taco 1900 series boiler pumps were level. Everything was ready to tie into a primary loop. Day 2 "The challenge on the second day was staying out of each other's way," said Mike Husmann, Matt's brother, who was onsite for the duration of the project. "There was a welder, two electricians, a manufacturer's rep from McCoy Sales, myself and one other technician onsite the whole day." The welder prepared the existing five-inch secondary loop for connection to the new boiler loop. Two big, closely spaced tees were installed to act as a hydraulic separator. Meanwhile, the Husmann crew went flat out-on the boiler loop. The primary loop starts with two-inch copper at the first stack of boilers, increases to three-inch as it reaches the second stack, and when it passes the third stack, the copper is four inches in diameter. Another Husmann technician began working on water heaters. Next to the boilers, two 119-gallon Burnham Alliance indirect water heaters now handle the school's domestic load. The near-boiler piping was almost complete by the end of the day; the only thing that remained was tying the primary and secondary loops together. Day 3 Electricians wired the boilers quickly, knowing that the time to fire the system would come soon enough. With the end clearly in sight, the six-inch PVC venting was also installed on Day 3, and the old conventional stacks were removed from the roof. A welder connected the five-inch steel pipe to the four-inch copper loop to complete the primary-secondary system. The big steel loop also utilizes a large Taco 4900 Series air and dirt separator. Six loops branch off the big secondary system, each supplying anywhere between four and 10 classrooms. At each classroom, a three-quarter-inch line tees off to supply a fan coil unit or short baseboard run. A Taco 4900 Series air and dirt separator was used on the large secondary loop. To provide more critical manpower for the fast-paced project, an electrical subcontractor was hired to wire the Alpine boilers.