Maintenance; Flushing The Heat Exchanger - Rinnai Infinity 20 External Operation And Installation Manual

3.7 MAINTENANCE

The appliance must be inspected, repaired and maintained by a licensed professional. The licensed professional must
verify proper operation after servicing.
For more detailed instructions on maintenance contact Rinnai or your supplier.
Cleaning
It is imperative that control compartments, burners, and circulating air passageways of the appliance be kept clean.
Clean as follows:
1. Turn off and disconnect electrical power. Allow to cool.
2. Remove the front panel by removing 4 screws.
3. Use pressurized air to remove dust from the main burner, heat exchanger, and fan blades. Do not use a wet
cloth or spray cleaners on the burner. Do not use volatile substances such as benzene and thinners. They may
ignite or fade the paint.
4. Use soft dry cloth to wipe cabinet.
5. When opening the combustion chamber for cleaning, the gasket needs to be renewed.
Vent System
The vent system should be inspected for blockages or damage.
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.
Temperature Controller
Use a soft damp cloth to clean the temperature controller. Do not use solvents.
Snow Accumulation
Keep the area around flue terminal free of snow and ice. The appliance will not function properly if the intake air or
exhaust is impeded (blocked or partially blocked) by obstructions.
Clean the 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.
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 figures a side.
Lime / Scale Build-up
If you receive diagnostic code "LC#" (LC1, LC2,...), refer to the procedure,
Flushing the Heat Exchanger. Refer to the section on Water Quality to see if
your water needs to be treated or conditioned. (When checking maintenance
code history, "00" is substituted for "LC#".)

3.7.1 FLUSHING THE HEAT EXCHANGER

An LC0~LC9 or "00" diagnostic code indicates the unit is beginning to lime
up and must be flushed. Failure to flush the appliance will cause damage to
the heat exchanger. Damage caused by lime build-up is not covered by the
unit's warranty. Rinnai strongly recommends installation of isolation valves
to allow for flushing of the heat exchanger.
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