Raypak Xtherm 1505A Installation & Operating Instructions Manual

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143. Check for leaks. Repair any that are found.Raypak Integral Cold WaterProtectionXTherm heaters are equipped with an integral coldwater protection system. Units equipped with the dualinjector pump system are designed to operate withheater inlet water temperatures down to 50°F continu-ous. Under start up conditions the dual injector systemcan operate with fluid temperatures down to 32°F.Operation at lower temperatures will create unwar-rantable damage to the injector pumps. XTherm WHand WHP models equipped with single injector pumpsare designed for typical domestic hot water and com-mercial pool heating operating conditions respectively.Contact your local representative or the factory forapplications assistance.Hydronic HeatingPump SelectionThe heater is equipped with an integral cold water pro-tection system that includes dual modulating injectorpumps to pull the required flow from the system loopand a heater pump, sized by the factory, for the opti-mal ∆T across the primary heat exchanger. Thesystem is designed for continuous return temperaturesfrom 50°F to 180°F.Feedwater RegulatorRaypak recommends that a feedwater regulator be in-stalled and set at 12 psi minimum pressure at thehighest point of the system. Install a check valve orback flow device upstream of the regulator, with amanual shut-off valve as required by local codes.PipingAll high points should be vented. A heater installedabove radiation level must be provided with a low wa-ter cut-off device (sales order option F-10). Thisheater, when used in connection with a refrigerationsystem, must be installed so that the chilled medium ispiped in parallel with the heater with appropriatevalves to pre-vent the chilled medium from enteringthe heater.The piping system of a hot water heater connected toheating coils located in air handling units where theymay be exposed to circulating refrigerated air, must beequipped with flow control valves or other automaticmeans to prevent gravity circulation of the heaterwater during the cooling cycle. It is highly recommend-ed that the piping be insulated.NOTE: Hot water heating systems all have uniquelevels of operating diversity that must be accountedfor in the system design. The system should alwaysinclude adequate system flow in excess of theconnected boiler flow for proper operation. Wherethe system flow may drop below the connectedboiler flow a buffer/decoupler may be needed.Failure to design for adequate flow (i.e. bypasses, 3way control valves, flow limiting balance devices,buffer tanks, etc.) will result in boiler short cyclingand may reduce boiler life. Always contact your localRaypak representative for system design assistanceto avoid these issues.