Make-up water from an approved backflow preventer feeds the system at 20 PSI minimum and 50 PSI maximum through a one-inch line. A Bell & Gossett dual unit pressure reducing and relief valve set at 60 PSI regulates the feed line, which includes isolation valves and a one-inch quick fill bypass. The make-up line connects to a low temperature coil and an expansion tank system with associated pressure gauges and unions.
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