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MOTORS
Motors are permanently lubricated and DO NOT
need periodic lubrication. However you must keep
fan and motor free of dust and dirt by cleaning
annually.
TEMPERATURE CONTROLLER
Use a soft damp cloth to clean the temperature
controller. DO NOT use solvents.
LIME/SCALE BUILD-UP
Scale build-up is caused by hard water and can
be accelerated if the water heater is set at a high
temperature. Refer to section "6.2 Flushing the
Heat Exchanger" for more information. Refer to
section "Water Quality Guidelines" to determine
if your water needs to be treated or conditioned.
The water must be potable, free of corrosive
chemicals, sand, dirt, or other contaminates. It
is up to the installer to ensure the water does
not contain corrosive chemicals, or elements
that can affect or damage the heat exchanger.
Water that contains chemicals exceeding required
levels, affect and damage the heat exchanger.
Replacement of the heat exchanger due to water
quality damage is not covered by the warranty.
SNOW ACCUMULATION
Keep the area around flue terminal free of snow
and ice. The water heater will not function properly
if the combustion air or exhaust vent pipes are
blocked or partially blocked by obstructions.
Keep the condensate drain line free of snow and
ice. Ensure the line is not blocked or clogged and
that condensate is flowing freely.
COASTAL INSTALLATIONS
Installations in or near coastal areas may require
additional maintenance due to corrosive airborne
ocean salt. If corrosion is observed on the body
of the water heater, the water heater shall be
inspected to ensure proper operation and if
necessary, repaired or replaced.
WATER FILTERS
Clean the inlet water filter by closing the cold and
hot water inlet isolation (shut-off) valves. Put a
bucket under the filter at the bottom of the water
heater to catch any water that is contained inside
the unit. Unscrew the water filter. Rinse the filter to
remove any debris. Install the filter and open the
isolation valves (Figure 3).
Rinnai Tankless Water Heater Installation and Operation Manual
PRESSURE RELIEF VALVE
Operate the pressure relief valve manually once
a year. In doing so, it will be necessary to take
precautions with regard to the discharge of
potentially scalding hot water under pressure.
Ensure discharge has a safe place to flow. Contact
with your body or other property may cause
damage or harm.
WARNING
Testing the pressure relief valve should only
be performed by a trained and qualified
professional. Water discharged from the
pressure relief valve could cause severe burns
instantly or death from scalds.
VISUAL INSPECTION OF FLAME
Verify proper operation after servicing. The burner
must flame evenly over the entire surface when
operating correctly. The flame must burn with a
clear, blue, stable flame. See the parts breakdown
of the burner for the location of the view ports.
The flame pattern should be as shown in the
images below:
SATISFACTORY
FRONT VIEW
Figure 90
Blue Flame
Flame Rod
59
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