Flushing The Heater Exchanger - Rinnai SENSEI RU199i Manual De Instalación Y Operación

5.3 Flushing the Heat Exchanger
This water heater includes a service indicated/reminder (Service Soon, SS). When selected in the parameter settings,
an SS code will display on the controller indicating that it is time to flush and service the water heater. Failure to
flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the
water heater's warranty. Rinnai strongly recommends installation of isolation valves to allow for flushing of the heat
exchanger.
1. Turn off power at the controller.
2. Disconnect electrical power to the water heater.
3. Close the shutoff valves on both the hot water and cold
water lines (V3 and V4).
4. Connect pump outlet hose (H1) to the cold water line at
service valve (V2).
5. Connect drain hose (H3) to the hot water line at service
valve (V1).
6. Pour four gallons of undiluted virgin, food grade, white
vinegar into pail.
7. Place the drain hose (H3) and the hose (H2) to the pump
inlet into the cleaning solution.
8. Open both service valves (V1 and V2) on the hot water
and cold water lines.
9. Operate the pump and allow the vinegar to circulate
through the water heater for at least 1 hour at a rate of
four gallons per minute (15.1 liters per minute).
10. Turn off the pump.
11. Rinse the vinegar from the water heater as follows:
a. Remove the free end of the drain hose (H3) from the
pail. Place in sink or outside to drain.
b. Close service valve (V2) and open shutoff valve (V4).
Do not open shutoff valve (V3).
c. Allow water to flow through the water heater for five
minutes.
d. Close shutoff valve (V4). When unit has finished
draining remove the in-line filter at the cold water
inlet and clean out any residue. Place filter back into
unit and open valve (V4).
e. Close service valve (V1) and open shutoff valve (V3).
12. Disconnect all hose
13. Restore electrical power to the water heater.
64
NOTE:
Scale build-up will affect the performance of
the water heater. Water should be treated.
Rinnai offers Southeastern Filtration's
"ScaleCutter Water Conditioning System" that
offers superior lime scale prevention and
corrosion control by feeding a blend of control
compounds into the cold water supply.
H3
H2
Circulating Pump
(Recommended
Rinnai Tankless Water Heater Installation and Operation Manual
H1
4 GPM)