Noritz NR71-SV Installation Manual

Also see for NR50-OD: Instruction manual Instructional manual Service manual Owner's guide Installation manual

Contents

Noritz NR71-SV Installation Manual Manual pdf 19 page image

19If this water heater will be installed in an application where the supply water is hard, the water must betreated with either the Noritz H2Flow or ScaleShield or a water softener. Refer to the below tables forsuggested treatment and maintenance measures to be taken based on the water hardness level. Dam-age to the water heater as a result of water in excess of 12 gpg (200 mg/L) of hardness is not coveredby the Noritz America Limited Warranty.Note: Water softeners may be regulated by the local water jurisdiction, consult with the manufacturer forcode, sizing, and installation guidelines; the below diagram is for reference only. For more informa-tion about Scale Shield, contact Noritz America at 866-766-7489.Water TreatmentWater Treatment SystemCity Water SupplyPressureReliefValveHot Water to FixturesShutoff ValveDrainCold to WaterHeaterOptional SedimentFilterWater Treatment DeviceShutoff ValveType of WaterHardnessLevelTreatmentDeviceFlushFrequency* Type of WaterHardnessLevelTreatmentDeviceFlushFrequency*Soft 0-1 gpg1-3 gpg(0-17 mg/L) None None NoneNoneNoneNoneSlightly Hard (17-51 mg/L) None NoneModeratelyHardHard3-7 gpg(51-120 mg/L) Once a Year** Once a YearTwice a YearOnce a Year**7-10 gpg(120-171 mg/L) ScaleShieldVery Hard 10-14 gpg(171-239 mg/L)TreatmentRequiredExtremelyHardSoftSlightly HardModeratelyHardHardVery HardExtremelyHard> 14 gpg(> 239 mg/L)0-1 gpg1-3 gpg(0-17 mg/L)(17-51 mg/L)3-7 gpg(51-120 mg/L)7-10 gpg(120-171 mg/L)10-14 gpg(171-239 mg/L)> 14 gpg(> 239 mg/L)H2FlowH2FlowH2Flow orScaleShieldH2Flow orTreatmentRequiredRequiredRequiredSuggested*****Install Noritz Isolation Valves to allow for flushing.**Flushing is required if a water softener is not installed.*Install Noritz Isolation Valves to allow for flushing.**Flushing is required if a water treatment device is not installed.Residential Use Treatment Guidelines Commercial Use Treatment GuidelinesH2FlowH2FlowH2FlowSuggestedH2FlowTreatmentTreatment