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Maintenance:
The Rinnai SENSEI™ N - Series water heaters include a service indicated / reminder. When selected in the parameter settings an
"SS" code will display on the controller indicating it is time to flush and service the water heater. Failure to service the appliance
may cause damage to the heat exchanger. Damage caused by scale build-up is not covered under the water heater's warranty.
Rinnai strongly recommends installation of the included isolation valves to allow for proper servicing of the water heater.
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Heat exchanger flush procedure.
1.
Turn off power at the controller, Disconnect electrical power to the water heater, Disconnect
from MSB ,Cascade or E-Z connect cables from unit (if applicable).
2.
Close the shutoff valves on both the hot and cold water lines (V3 and V4)
3.
Connect pump outlet hose (H1) to the cold water line at service valve V2
4.
Connect drain hose (H3) to service valve V1
5.
Pour approximately 4 gallons of virgin food grade white vinegar into pail
6.
Place the drain hose (H3) and the hose (H2) to the pump inlet into the cleaning solution
7.
Reconnect power to unit and allow Water flow servo and Water flow by-pass time to reset to
start position, approximately 10-15 seconds. Disconnect power again before flushing.
8.
Open both service valves (V1 and V2) on the hot and cold water lines
9.
Operate the pump and allow the cleaning solution to circulate through the water heater for at
least 1 hour at a rate of 4 GPM (15.1 L/min).
10.
Turn off the pump
11.
Rinse the cleaning solution from the water heater by:
a.
Remove the free end of the drain hose (H3) from the pail and place in a suitable
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 5 minutes
d.
Close service valve, V1 and shutoff valve V4.
12.
Disconnect all hoses
13.
Remove the in-line filter at the cold water inlet and clean out any residue
a.
Place the filter back into the unit.
14.
Open shutoff valves V3 and V4.
15.
Reconnect MSA, Cascade or E-Z Connect cable (if applicable). Restore electrical power to the
water heater.
Enhancing Lives By Changing The Way Water Is Heated
16
8/17/2021
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