Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 85
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.
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 “6.3 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 affect or damage the heat
exchanger. Water that contains chemicals
exceeding the levels required 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 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 flowing 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 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.
•
Air Filter — See section “6.2 Cleaning and
Inspecting the Air Filter” for more
information.
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:
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.
WARNING
Flame
Rod
SATISFACTORY
FRONT VIEW
Blue Flame
Figure 91
Flame
Rod
UNSATISFACTORY
FRONT VIEW
Yellow Flame
Figure 92
Clean burner if the flame pattern does not
look satisfactory.