Raypak XFyre 300A Installation & Operating Instructions Manual

Domestic Hot WaterWhen designing the water piping system for domestichot water applications, water hardness should be con-sidered. Table H indicates the suggested flow rates forsoft and medium water. Hard water must be softenedfor direct heating with the XFyre. Water hardness isexpressed in grains per gallon.Fig. 9: MODE 3 - Single Boiler with Indirecton Boiler LoopNOTE: If local codes require a vacuum relief valve,acquire one locally and install per valvemanufacturer’s instructions.Fig. 10: WH Units - Single Water Heater with TankH Units - Single Boiler with Process Tank16determined by the water temperature at the IndirectSupply sensor (S6) and the Target Max setting whenusing the Indirect DHW sensor (S5). The Boiler Pump(P1) runs during all heat calls regardless of priority.The Indirect DHW Pump (P3) runs during an indirectcall for heat with no “off” delay. The Boiler Pump (P1)and System Pump (P2) delay “off” as user defined inthe ADJUST menu. The system pump (P2) runswhenever the system is enabled for heating and theoutdoor air temperature is lower than the WWSD tem-perature setting (if utilized) unless an indirect call forheat is present.WH – Direct DHW ConfigurationWhen the unit is ordered as a “WH” configuration theonly application available to it is direct DHW with sin-gle or multiple heaters (Maximum 4 heaters). The tanktemperature is controlled by the System sensor (S3).The Boiler Pump (P1) runs during any call for heat.The System Pump (P2) output is active whenever thesystem is enabled. The Boiler Pump is delayed “off”after the Tank Target temperature is achieved and asuser defined in the ADJUST menu.NOTE: A Tank Aquastat can be used in lieu of theIndirect DHW Sensor (S5). See the Versa IC manu-al for additional details.NOTE: WH units will operate to a maximum tanktemperature of 150F. For temperatures requiredabove 150F an “H” model boiler must be used andgreat care must be given to ensuring water hardnessis less than 5 grains per gallon to ensure scale freeoperation. MODE 1 should be used and configuredfor setpoint operation for process heating applica-tions.