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In the event of a power failure at temperatures below freezing, the water heater should be drained of all water to prevent freezing damage. The unit may be drained manually or through the installation of the Optional solenoid valves as shown. The electrical connections for the two solenoid valves should be tied to the 120 V power terminals provided on the PC Board of the water heater.When the electrical power to the water heater fails, the cold water supply solenoid valve closes, heater, and the drain down solenoid valve opens, allowing the water heater and associated piping to drain. Ensure that you run the drain for the solenoids per local codes. Route drainper local codes TanklessEquipment List QTY Tankless Outdoor 3 Water HeatersElectronic Connection ** Refer to Tankless Accessories and Model Applicability forelectronic connection details.Normally Closed Solenoid Valve(Full Size of Cold Water Supply Line) 1/4 “ MinimumNormally OpenSolenoid Valve Pressure Relief Valve 3/ 4" Ball Valve3/ 4" UnionCheck Valve Key S Pressure RegulatorCirculating PumpSolenoid Valve Boiler Drain Valve WH-3-D Domestic Hot Water - Optional Freeze Protection3 Outdoor Tankless Water HeatersPreferred Piping InstallationFebruary 27, 2008 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. Hot WaterSupply Line S S Sub 2Sub 1Primary VacuumBreaker NOTE:outside building structure. These are indicated by being above the dashed line.line should be located inside the buildingstructure. The vacuum breaker line should be located inside the building structure. NOTE:enclosure or recess box and packed with insulation for additional protection. OutdoorTanklessWater Heater OutdoorTanklessWater Heater Cold Water Supply Line Gas Supply Line OutdoorTanklessWater Heater IMPORTANT! With electrical power supplied to a Tankles water heater, it will not freeze in enviornments as cold as -30.F, when protected from direct wind exposure. In the event of a power failure at temperatures below freezing, the water heater should be drained of all water to prevent freezing damage. The unit may be drained manually or through the installation of the Optional solenoid valves as shown. The electrical connections for the two solenoid valves should be tied to the 120 V power terminals provided on the PC Board of the water heater.When the electrical power to the water heater fails, the cold water supply solenoid valve closes, heater, and the drain down solenoid valve opens, allowing the water heater and associated piping to drain. Ensure that you run the drain for the solenoids per local codes. Route drainper local codes TanklessEquipment List QTY Tankless Outdoor 3 Water HeatersElectronic Co...

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