Noritz NC250-SV-ASME Guide De L'utilisateur page 25

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The hot water is turbid.
Water leaks from the drain plugs
on the outlet.
The water appears blue
The bath tub/wash-basin has turned
blue
åÃè·ï\é¶Ç Ç®í≤Ç◊Ç≠ÇæÇ≥Ç¢ åÃè·ï\é¶Ç Ç®í≤Ç◊Ç≠ÇæÇ≥Ç¢
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)
• This is harmless. Small bubbles appear as the air in the
water is heated and depressurized rapidly to
atmospheric pressure.
• When the unit is under very high pressure, water will leak
from the drain plugs as a safety so that the unit is not
damaged by the high pressure.
• Coloration to a blue color may be noticed from small
traces of copper ion contained in the water and fat
(furring). However, there are not problems concerning
health. Coloration of the bath tub/wash-basin can be
prevented by cleaning frequently.
Water Quality
Total Hardness*
Aluminum
Chloride
Copper
Iron
Manganese
pH
Total Dissolved Solids
Zinc
Sulfate ion
Residual chlorine
* Maximum limit suggested by Noritz.
: 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
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