Regular Maintenance; Water Quality And Maintenance - Noritz NR501-OD Service Manual

Regular Maintenance-2

Water Quality and Maintenance

For people who live in a hard water area. Periodical cleaning is necessary.
Damage to the water heater as a result
of poor water quality is not covered by
the Limited Warranty. To ensure full
warranty coverage, treat or condition
water that exceeds the target levels
provided in this table.
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
Isolation Valves
Hot Water
Service Valve
Pressure Relief Valve
Drain
Water Outlet
Total Hardness*
Aluminum
Chloride
Copper
Iron
Manganese
pH
Total Dissolved Solids
Zinc
Sulfate ion
Residual chlorine
* Maximum limit suggested by Noritz.
Cold Water
Service Valve
Water Intlet
(Ex. NRC661-DV)
74
: 200 mg/L (12 gpg) or less
: 0.05 to 0.2 mg/L or less
: 250 mg/L or less
: 1 mg/L or less
: 0.3 mg/L or less
: 0.05 mg/L or less
: 6.5 - 8.5
: 500 mg/L or less
: 5 mg/L or less
: 250 mg/L or less
: 4 mg/L or less
* Isolation valves may be purchased as an
accessory from Noritz.
They allow for full diagnostic testing and easy
flushing of the system.
* The kit includes two full port isolation valves
and a pressure relief valve for the hot side.
Contact Noritz for more information.