Noritz N-0751M Installation Manual

Also see for N-0751M: Field manual Owner's guide Installation manual Owner's guide Instructional manual

Contents

20If this water heater will be installed in an application where the supply water is hard, the water must betreated with either a water softener, which removes the hardness, or by using sequestering agents, suchas the Noritz Scale Shield, that reduce the amount of scale deposits. Refer to the below tables for sug-gested treatment and maintenance measures to be taken based on the water hardness level. Damage tothe water heater as a result of water in excess of 12 gpg (200 mg/L) of hardness is not covered by theNoritz America Limited Warranty.Note: When installing a water softener, consult with the manufacturer for proper sizing and installationguidelines; the below diagram is for reference only. For more information about Scale Shield, contactNoritz 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) ScaleShield Once a Year Once a YearTwice a YearOnce a Year7-10 gpg(120-171 mg/L) ScaleShieldVery Hard 10-14 gpg(171-239 mg/L)WaterSoftener SoftenerRequiredExtremelyHardSoftSlightly 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)WaterSoftenerSoftenerRequiredWaterSoftener SoftenerRequiredWaterSoftenerSoftenerRequired* Install Noritz Isolation Valves to allow for flushing.WaterSoftenerSuggestedWaterSoftenerSuggested*****Install Noritz Isolation Valves to allow for flushing.**Flushing is required if a water softener is not installed.Residential Use Treatment Guidelines Commercial Use Treatment GuidelinesNORITZGas WaterHeater