SECTION E: HYDRONIC HEATING PIPING
PUMP SELECTION
In order to ensure 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 heater is firing at full rate). If a Delta T larger than 20°F is necessary, see Table
PRESSURE DROP IN FEET OF HEAD
FEEDWATER REGULATOR
Raypak recommends that a feedwater regulator be installed and set at 12 PSIG minimum pressure at the highest point of system. Install a check valve or back flow device upstream of the regulator, with a manual shut off valve as required by local codes.
PIPING - HEATING BOILERS
All high points should be vented. Purge valves and a bypass valve should be installed. A boiler installed above radiation level must be provided with a low water
The boiler piping system of a hot water heating boiler connected to heating coils located in air handling units where they may be exposed to circulating refrigerated air, must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. It is highly recommended that the piping be insulated.
AIR-SEPARATION/EXPANSION TANK
All boilers should be equipped with a properly sized expansion tank and air separator fitting as shown in the following diagrams.
THREE-WAY VALVES
Valves designed to blend water temperatures or reduce water circulation through the boiler should not be used. Raypak boilers are high recovery low mass boilers not subject to thermal shock. Raypak offers a full line of electric sequencers that produce direct reset of boiler water temperature. Refer to the Controls Section in our Complete Catalog.
Table D-1
* Flow switch (when used) will not activate at less than 12 gpm. NOTE: Basis for minimum flow - 10 gpm or 40° Delta T
maximum flow - 44 gpm, except for 1.25” header.
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