29
Water Drain Valve (with Water Filter)
If the water drain valve (with water filter) is covered
with debris, the hot water may not run smoothly,
or the Water Heater may put out cold water. Check
and clean the filter as explained below.
• For people who live in a hard water area, periodic
flushing is necessary. If the Heat Exchanger is not
flushed, the Scale Build-up may cause damage to
the Heat Exchanger.
To prevent damage to the Heat Exchanger, the
Heat Exchanger regularly needs to be flushed.
• This Water Heater is equipped with an automatic
service reminder to announce for flushing the
Heat Exchanger.
The factory default of this service reminder is
disable.
If desired, the customer or installer needs to
enable the service reminder (connect the red
connector marked “SERVICE REMINDER”).
Refer to the “Water Treatment: About the Service
Reminder” in the Installation Manual.
• If the service reminder is selected to ON, the
code “C1#”(#=1,2,3,4 ... 9) will displayed on the
Remote Controller after the set time period has
been reached. When the code is displayed, the
Heat Exchanger needs to be flushed to prevent
damage from Scale Build-up. Refer to the
“Procedure for flushing the Heat Exchanger” in
the Installation Manual or contact Noritz America
for more information. (http://support.noritz.com/
or 1-866-766-7489)
• Damage to the Water Heater as a result of below
is not covered by the Noritz America Limited
Warranty. To ensure full warranty coverage, treat
or condition water that exceeds the target levels
provided in this table.
- Water in excess of 12 gpg (200 mg/L) of
hardness
- Poor water quality (see the following table)
- The Water Heater has displayed a “C1# “
(Service Reminder) indicating Scale Build-up,
but the heat exchanger has not been flushed.
Contaminant
Maximum Allowable Level
Total Hardness*
200 mg/L (12 gpg) or less
Aluminum
0.05 to 0.2 mg/L or less
Chloride
250 mg/L or less
Copper
1.0 mg/L or less
Iron
0.3 mg/L or less
Manganese
0.05 mg/L or less
pH
6.5-8.5
Total Dissolved Solids 500 mg/L or less
Zinc
5 mg/L or less
Sulfate
250 mg/L or less
Residual chlorine*
4 mg/L or less
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
* Maximum limit suggested by Noritz.
Water Quality and Maintenance
Regular Maintenance
1. Close the hot water valve and the water supply
valve.
2. With a bucket ready, remove the water drain
valve.
5. Open the hot water valve and the water supply
valve.
Check that water does not leak from the water
drain valve.
3. Clean the water filter with a brush under
running water.
4. Reattach the water drain valve (with water
filter).
NOTE
Take care not to lose the O-Ring.
NOTE
Approximately 0.80 gallon (3.0 L) of
water will drain out.
O-Ring
Water drain valve
with water filter
Hot water
valve
Water supply
valve
To prevent burns or scalding, turn off the
Power
button and wait until the appliance cools before
draining the water.
WARNING
