Installation Sheet

66 Rinnai Tankless Water Heater Installaon and Operaon Manual
1. Turn o power at the controller.
2. Disconnect electrical power to the water heater.
3. Close the shuto 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 4 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 soluon.
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 4
gallons per minute (15.1 liters per minute).
10. Turn o 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 shuto valve (V4).
Do not open shuto valve (V3).
c. Allow water to ow through the water heater for 5
minutes.
d. Close shuto valve (V4). When unit has nished
draining remove the in-line lter at the cold water
inlet and clean out any residue. Place lter back into
unit and open valve (V4).
e. Close service valve (V1) and open shuto valve (V3).
12. Disconnect all hose
13. Restore electrical power to the water heater.
5.3 Flushing the Heat Exchanger
NOTE:
Scale build-up will aect the performance of
the water heater. Water should be treated.
Rinnai oers Southeastern Filtraon’s
“ScaleCuer Water Condioning System” that
oers superior lime scale prevenon and
corrosion control by feeding a blend of control
compounds into the cold water supply.
H1
H3
Circulating Pump
(Recommended
4 GPM)
H2
This water heater includes a service indicated/reminder (Service Soon, SS). When selected in the parameter sengs,
an SS code will display on the controller indicang that it is me to ush and service the water heater. Failure to
ush 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 installaon of isolaon valves to allow for ushing of the heat
exchanger.
5.3 Flushing the Heat Exchanger