At Holton Community Hospital in rural Holton, Kan., two cast-iron atmospheric boilers and three gas-fired water heaters that had been in place for nearly 20 years were operating inefficiently.
>” […] Based on the boiler-plate outputs and firing rates of the existing boilers and domestic water heaters at design conditions and outputs, three Knight XL heating boilers with inputs of 500,000 Btuh, two 119-gal. Squire indirect water heaters, and a 119-gal. buffer tank were selected. […]
On one of the Knight XL heating boilers, a Grundfos MAGNA3 variable-speed circulator pump was installed. The boiler controls the speed of the pump using the built-in Smart System. When the boiler modulates down, the pump slows to maintain a constant temperature rise across the heat exchanger at all times. Reducing pump revolutions reduces power consumption tremendously.
Monitoring equipment was placed on both the lead boiler and the member boiler not dedicated to…
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