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Testing the pressure relief valve should only
be performed by a trained and qualied
professional. Water discharged from the
pressure relief valve could cause severe burns
instantly or death from scalds.
WARNING
FRONT VIEW
Flame Rod
Blue Flame
SATISFACTORY
Figure 73
Rinnai Tankless Water Heater Installation and Operation Manual 77
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 “6.3 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 aect or damage the heat exchanger. Water
that contains chemicals exceeding the levels
required aect 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 ue terminal free of snow
and ice. The water heater will not function properly
if the combustion air or exhaust vent pipes
are impeded (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 owing freely.
COASTAL INSTALLATIONS
Installations located 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.
FILTERS
• Water Filter — Clean the inlet water lter by
closing the cold and hot water inlet isolation
(shut-o)t valves. Put a bucket under the lter
at the bottom of the water heater to catch
any water that is contained inside the unit.
Unscrew the water lter. Rinse the lter to
remove any debris. Install the lter and open
the isolation valves.
• Air Filter — See section “6.2 Cleaning and
Inspecting the Air Filter” for more information.
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 ow.
Contact with your body or other property may
cause damage or harm.
VISUAL INSPECTION OF FLAME
Verify proper operation after servicing. The burner
must ame evenly over the entire surface when
operating correctly. The ame must burn with a
clear, blue, stable ame. See the parts breakdown
of the burner for the location of the view ports.
The ame pattern should be as shown in the
images below:
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