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SECTION E: HYDRONIC HEATING PIPING
PUMP SELECTION
In order to insure proper performance of your boiler system, you must install a properly sized pump. Raypak recommends
using a 20°F Delta T as design Delta T. (Delta T is the temperature difference between the inlet and outlet water when the
boiler is firing at full rate). If a
Delta T larger than 20°F is necessary, the bypass must be installed and adjusted to insure
proper hydraulics through the boiler while still allowing minimum flow to satisfy the safety flow switch. See Table D-1 for flow
rate requirements.