Raypak 1501 User Manual
Page 13
13
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.