Raypak 1001 Operating And Installation Manual page 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
Delta Delta Delta
using a 20°F T as design T. ( T is the temperature difference between the inlet and outlet water when the
Delta
boiler is firing at full rate). If a 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.
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