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G as S upply (Optional) 2- 6 Gallo nStorage Tank(To eliminate cold watersandwich e ect caused byfre quent On/ O operation) TanklessWater Heater Expansion Tank Minimum 3/4 “ Cold Water Supply Line Minimum 3/4 “ Hot Water Supply LineBuilding Outlets For this application:Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer. Pump to be sized to maintain circulationloop temperature.A minimum of 3 GPM flow is recommended for the circulation system.The pump should be sized to overcome thepressure loss through the Tankless waterheater, optional storage tank, and supply and return plumbing in the circulation loop.Reference the section Pump Sizing forCirculation.Pump to be of bronze or stainless construction. Aquastat Connection TanklessEquipment List QTY Tankless 1 Water Heater Pressure Relief Valve 3/ 4" Ball Valve3/ 4" UnionCheck Valve Key S Pressure RegulatorCirculating PumpSolenoid Valve Boiler Drain Valve WH-1-R Domestic Hot Water - Circulation Systems1 Tankless Water HeaterOptional Piping InstallationJune 11, 2007 This is not an engineering drawing; it notas a replacement for professional engineering This drawing is not intended to describe It is up to thecontractor or engineer to determine andconfiguration of the particular The drawing doesnot imply compliance with It is theresponsibility of the engineer isin accordance with Confer with local buildingofficials before installation. G as S upply (Optional) 2- 6 Gallo nStorage Tank(To eliminate cold watersandwich e ect caused byfre quent On/ O operation) TanklessWater Heater Expansion Tank Minimum 3/4 “ Cold Water Supply Line Minimum 3/4 “ Hot Water Supply LineBuilding Outlets For this application:Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer. Pump to be sized to maintain circulationloop temperature.A minimum of 3 GPM flow is recommended for the circulation system.The pump should be sized to overcome thepressure loss through the Tankless waterheater, optional storage tank, and supply and return plumbing in the circulation loop.Reference the section Pump Sizing forCirculation.Pump to be of bronze or stainless construction. Aquastat Connection TanklessEquipment List QTY Tankless 1 Water Heater 20 Expansion Tank Minimum 3/4 “ Cold Water Supply Line Minimum 3/4 “ Hot Water Supply Line Building SupplyGas Supply Line TanklessWater HeaterPrimary TanklessWater HeaterSub 1 Gas or Electric Tank WaterHeater Important: Install return line to the hot supply line as close as possibleto the Rinnai water heater For this application:Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer. Pump to be sized to maintain circulationloop temperature.The pump should be sized to overcome thepressure loss through the tank water heater, and supply and return plumbing in thecirculation loop. Reference the sectionPump Sizing for Circulation.Pump to be of bronze or stainless construction. TanklessEquipment List QTY Tankless 2 Water HeatersE...

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