Navien NHW700, Руководство пользователя

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18 Maintaining the Water Heater
If your local water is hard, please review the
following recommended treatment and flushing
guidelines.
Hardness Level
Treatment
Method
Flush
Frequency*
Soft
0-4 grains/gal
(0-60 mg/L)
None None
Moderately
Hard 4-7 grains/gal
(61-120 mg/L) Water
Softener**
or Navien
PeakFlow is
Recommended
Once/Year
Hard
7-9 grains/gal
(121-160 mg/L)
Residential:
Once/Year
Very Hard
9-12 grains/gal
(161-200 mg/L)
Water
Softener**
or Navien
PeakFlow
is HIGHLY
Recommended
Extremely
Hard >12 grains/gal
(200 mg/L)
Water
Softener**
or Navien
PeakFlow is
Required
* Flushing is recommended if a treatment device is
not installed.
This procedure should be performed
using white vinegar or solutions that are specifically
formulated for use on tankless water heaters. See
page 18 for more information on flushing the heat
exchanger.
** Check local codes for any restrictions on use of water
softeners.
Refer to the “2.2 Parts of the Water Heater” on page
7 for details about part locations.
Before flushing the Heat Exchanger, gather the
following items:
●
A bucket that is 5 gallons or larger
●
Cleaning solution diluted with water
●
3 hoses
●
A water circulation pump
4.3 Flushing the Heat Exchanger
NOTICE
Flushing the Heat Exchanger can be a difficult
procedure. Read the following instructions
carefully before attempting this procedure. If
you are uncertain about any of the steps in the
procedure, contact an authorized technician
or licensed professional. Keep in mind that
improper maintenance can void your warranty.
About Water Quality
Proper maintenance of the water heater is required
when water quality does not meet EPA standards.
Damage caused by poor water quality is not
covered under warranty. The following table shows
the maximum contaminant levels allowed, based
on the EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3). If you suspect that
your water is contaminated in any way, discontinue
use of the water heater and contact an authorized
technician or licensed professional.
Contaminant Maximum Allowable Level
Total Hardness Up to 200 mg/l (12 grains/gallon)
Aluminum 0.05 to 0.2 mg/l
Chloride Up to 250 mg/l
Copper Up to 1.0 mg/l
Iron Up to 0.3 mg/l
Manganese Up to 0.05 mg/l
pH 6.5 to 8.5
Sulfate Up to 250 mg/l
Total
Dissolved
Solids (TDS)
Up to 500 mg/l
Zinc Up to 5 mg/l
Chlorine Up to 4 mg/l